Kenwood KDC-V7521/Y User manual

© 2001-11 PRINTED IN JAPAN
B51-7869-00 (N)1940
CD RECEIVER
KDC-V7521/Y
SERVICE MANUAL
Escutcheon assy
(B07-3007-03)
Front glass
(B10-4161-01) Panel assy
(A64-2582-02)
KDC-V7521/Y
This service manual does not include information on the CD mechanism assembly (exploded view, parts list,
schematic diagram or mechanism operation description).
For such information, please refer to the CD mechanism assembly service manual (X92-4030-0X, X92-4440-0X,
: B51-7867-00).
DC cord
(E30-4942-05): KDC-V7521Y
(E30-4956-05): KDC-V7521
Antenna adaptor
(T90-0523/0534-05)
Screw set
(N99-1704-05)
Lever
(D10-4562-04)
(D10-4621-04):KDC-V7521
Mounting hardware assy
(J21-9716-03)
Torsion coil spring
(G01-2924-04)
Plastic cabinet assy
(A02-1497-13)
Remote controller assy
(A70-2025-05) Remote controller assy
(A70-0886-15)

KDC-V7521/Y
2
BLOCK DIAGRAM
PLL+B
FM+B
Q43,44
Q45,46 AM+B
DIMMER
MUTE
2WAY
DET.
ACC
BU DET.
A8V
A8V
Q4-6
IC3
Q9
Q7,8
Q10-13
SERVO AVR
SERVO+B
SW5V
Q3
Q50,51
Q30
Q1,2
SW5V
BU5V
BU5V
P CON
Q26-29
MUTE
IC8
Q32,33,35
DRIVER
MUTE
Q37-40
POWER IC
IC4
SYSTEM MI-COM
CD
CH
F/E
A1,Q53
E-VOL
IC2
PRE OUT
SP-OUT
DIMMER
TEL-MUTE
ACC
BACK UP
A-CONT
P-CONT
DECODER
RDS
IC1
IC14
Q52
EX.AMP CONTROL
ILLUM
+B
RESET
SW
RESET IC
IC16
IC2
IC1
IC3
Q3,4
Q5
LCD
DRIVER
REMO
G/R SW V-I
CONVERTER
BUFFER
NOISE
Q36
OUTPUT VOLTAGE
CONTROL
EX.AMP
Q14
Q15
Q31 NAVI-MUTE
PANEL 5V
PANEL 5V
KEY
MATRIX
SW14V
SRM
MECHA. SRM
DRIVER
MOTOR
(BACK LIGHT V-ILL)
LCD
ED1
CH
QUAL
SERVO+B
MUTE R
STOP
SW2
LO/EJ
MUTE L
RST
SW3
SW1
SDA
SCL
A8V
BU5V
SW5V
RST
REQ C
CLK
CH-CON
DATA H
REQ H
CD
AM
FM
P MUTE
MUTE
SW5V
PANEL5V
L DATAL L CE L CLK L DATAS DA SDA DA SCL
REMO
RESET
ILL+B
SRM SW1 SRM DET SRM SW2 SRM SW3 SRM SUB- SRM SUB+
RDCK
RDDA
QUAL
SDA
SCL
AFS
AFS
A8V
PLL DATA
PLL CLK
IFC OUT
S-METER
SW5V SW5V
DATA C
BACK UP BU5V
PANEL 5V
CHANGER
AM
FM
230mV
1200mV
1200mV
251mV
AUDIO OUT
NOISE
CD 3600mV
3600mV
855mV
1372mV
DRIVER
MUTE
MO SW
LCD
AVR
(X16- )
V-ILL
DAC
IC15

3
Ref.No. Component name Application/Function Operation/Condition/Compatibility
IC1 LC75808W LCD driver with key matrix
IC2 RS-171 Remote sensor IC
IC3 M62333FP D/A converter The brightness control of red, green and blue colour
Q1 DTA114EUA or KRA302 Key permission SW For the key scanning start and the key detection SW
Q3 2SC4081 Red LED SW When a base goes Hi, RED LEDs are turned on.
Q4 2SC4081 Green LED SW When a base goes Hi, GREEN LEDs are turned on.
Q5 2SC4081 VLCD AVR For LCD driver IC
Q6 DTA114EUA or KRA302 REMO SW While a base goes Lo, PAN 5V is supplied to the
Remote sensor IC.
Q50-55 UMX2N Constant current driver The current control of red, green and blue LEDs
for the variable illumination
Q62 2SC4081 Buffer The control voltage of the constant current driver
for red colour
Q63 2SC4081 Buffer The control voltage of the constant current driver
for green colour
Q64 2SC4081 Buffer The control voltage of the constant current driver
for blue colour
●ELECTRIC UNIT (X25-9392-7X, X25-8762-72)
Ref.No. Component name Application/Function Operation/Condition/Compatibility
IC1 UPD703033GC139 System MI-COM.
IC2 TDA7407D E. VOL & N.C. MPX IC
IC3 M5237ML AVR IC IC is combined with Q4, and it works as the error
detection, the driver.
IC4 TA8273H Power IC
HD74HC02FP
IC8 or TC74HC02AF Mute logic 2-input NOR x 4
or 74VHC02SJ
IC14 TDA7479D RDS decoder
IC15 LB1930M Motor driver IC For SRM mechanism drive
IC16 S-80837ANNP Reset IC When BU 5V voltage is less than 3.7V, IC outputs Lo.
Q1 2SB1548 (P) BU 5V AVR While BACKUP is applied, AVR outputs +5V.
Q2 2SC4081 or 2SD1819A Q1 and Q2 are inverted Darlington connection.
Q3 2SA1576A or 2SB1218A SW 5V While a base goes Lo, SW 5V is supplied to the
microprocessor peripheral circuits.
Q4 2SB1548 (P) A8V AVR Q4 is combined with IC3, and it outputs +8.3V.
Q5 DTC144EUA or UN5213 A8V AVR ON/OFF control
Q6 DTA124EUA or KRA303 A8V AVR SW While Q5's base goes Hi, Q6 is turned on, and
A8V AVR is working.
Q7 DTA124EUA or KRA303 A8V AVR and SERVO +B AVR ON/OFF control
SW14V SW While Q8's base goes Hi, Q7 is turned on, A8V
Q8 DTC144EUA or UN5213 AVR and SERVO +BAVR are working.
KDC-V7521/Y
COMPONENT DESCRIPTION
●SWITCH UNIT (X16-154X-XX, X16-1892-70)

4
KDC-V7521/Y
Ref.No. Component name Application/Function Operation/Condition/Compatibility
Q9 2SD2375 SERVO +B AVR When Q9's base goes Hi, SERVO +B AVR
outputs +7.6V.
Q10 2SB1184 While Q11's base goes Hi, AVR outputs +10.7V.
Q11 2SC4081 or 2SD1819A ILL +BAVR Works during POWER ON mode with a panel
attached to the set.
Q12 DTC144EUA or UN5213 ILL +B AVR ON/OFF control
Q13 DTA124EUAor KRA303 ILL +B SW While Q12's base goes Hi, Q13 is turned on, and
ILL +B AVR is working.
Q14 DTA123JK or KRA105S EXT. AMP CON. SW When a base goes Lo, Q14 is turned on, and
control pulse waveform shape is outputted.
Q15 DTC144EUA or UN5213 Small lamp detection SW When vehicle small lamps turn on, Q15 is turned
on .
Q26 2SB1277 (Q, R) P-CON SW When Q29's base goes Hi, Q26 is turned on .
Q29 DTC114YUA or UN5214 Works during POWER ON mode.
Q27 2SA1576A or 2SB1218A P-CON. protection SW Protect Q26 by turning ON when P-CON output
is grounded.
Q28 DTA124EUAor KRA303 P-CON. protection inhibit SW Prevents Q27 tuning ON during start-up after
power ON.
While BACKUP is applied, a base goes Hi, and
Q30 2SC4081 or 2SD1819A BU detection SW Q30 is turned on.
When momentary power down has detected, a
base goes Lo, and Q30 is turned off.
Q31 2SC4081 or 2SD1819A ACC detection SW While ACC is applied, a base goes Hi, and Q31
is turned on.
Q32 DTA124EUAor KRA303 Mute driver for L Ch. When BU detection SW or System RESET or MI-
Q33 DTA124EUAor KRA303 Mute driver for R Ch. COM.'s Pre-mute is working, a base goes Lo,
and Q32 and Q33 are turned on.
Q35 DTC124EUA or UN5212 E. VOL mute SW When BU detection SW or MI-COM.'s mute is
working, a base goes Hi, and Q35 is turned on.
Q36 2SC4081 or 2SD1819A Noise buffer
Q37 DTC143TUA or KRC410 Audio mute SW (Front L) When Q37's base goes Hi, Pre-output is muted.
Q38 DTC143TUA or KRC410 Audio mute SW (Front R) When Q38's base goes Hi, Pre-output is muted.
Q39 DTC143TUA or KRC410 Audio mute SW (Rear L) When Q39's base goes Hi, Pre-output is muted.
Q40 DTC143TUA or KRC410 Audio mute SW (Rear R) When Q40's base goes Hi, Pre-output is muted.
Q43 DTC124EUA or UN5212 When Q43's base goes Hi, Q44 is turned on, and
Q44 2SB1277 (Q, R) FM +B SW A8V is supplied to the F/E.
Works during FM reception mode.
Q45 DTC124EUA or UN5212 When Q45's base goes Hi, Q46 is turned on, and
Q46 2SB1277 (Q, R) AM +B SW A8V is supplied to the F/E.
Works during AM reception mode.
Q50 DTC144EUA or UN5213 PAN 5V SW While a panel is attached to the set, Q50 and Q51
Q51 2SA1576A or 2SB1218A are turned on, and BU 5V is supplied to the panel.
Q52 2SC4081 or 2SD1819A Composite signal output buffer
Q53 DTC144EUA or UN5213 IFC buffer Waveform shaping
COMPONENT DESCRIPTION

5
KDC-V7521/Y
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Description Processing Operation
1 AM+B O AM+B control Hi : During AM reception
2 FM+B O FM+B control Hi : During FM reception, Hi : During FM reception
if with RDS, RDBS
3 AFS O Noise detection time constant switching terminal Hi : During FM reception, Lo : During FM seek or
AF search
4 PLL-DATA I/O Data input/output with F/E
5 PLL-CLK I/O Clock output to F/E
6 EVDD - Positive power supply connection terminal Connected to BU 5V lines.
7 EVSS - Ground connection terminal Connected to GND lines.
8 N.C. O Not used (N.C.)
9 BEEP O BEEP sound output
10 REMO I Data input from the remote control light sensor
11 PRE-MUTE L O Pre-out mute control (L) When M MUTE L input is Lo during CD source
selected, PRE MUTE L outputs Lo.
12 PRE-MUTE R O Pre-out mute control (R) When M MUTE R input is Lo during CD source
selected, PRE MUTE R outputs Lo.
13 IC2-SDA I/O Data line with IC2,CD mechanism MI-COM.
14 IC2-CLK O Clock line with IC2,CD mechanism MI-COM.
15,16 N.C. O Not used (N.C.)
17 DA-SDA / DIM-CON O Data output to D/Aconverter (V-LED model) Data line with D/A converter
/ Dimmer control output / Hi : Dimmer OFF, Pulse wave shape : Dimmer ON
18 TEST - Test terminal Not used (Connected to GND lines)
19 P-MUTE O Power IC mute control output Lo : Mute (during POWER OFF, ALL OFF, TEL
MUTE)
20 P-STBY O Power IC standby control output Lo : Power IC OFF, Hi : Power IC ON, ALL OFF
mode
21 MUTE O IC2 mute control output OPEN (Hi) : Mute ON, Lo : Mute OFF
22,23 N.C. O Not used (N.C.)
24 ACC-DET I ACC detection terminal Lo : ACC ON, Hi : ACC OFF
25 DIMMER I Small lights detection input Lo : During vehicle small lamps turn on.
26 SW5V O SW 5V control output Lo : POWER ON mode
Bass boost OFF__Hi : 160msec, Lo : 40msec
27 EXT-AMP-CONT O External amp. control output Bass boost LOW__Hi : 130msec, Lo : 70msec
Bass boost HI__ Hi : 100msec, Lo : 100msec
28 P-CON O Power control output Lo : POWER OFF mode, Hi : POWER ON mode
29 ANT-CON O Antenna control output Hi : During TUNER mode or TI reception
30 P-ON O SW 14V control output Hi : POWER ON mode
31 RESET I Reset input terminal Lo : System reset
32 XT1 I Sub clock resonator connection terminal Clock count during POWER OFF mode
●IC1 (ELECTRIC UNIT : X25-9392-7X, X25-8762-72)

6
KDC-V7521/Y
Pin No. Pin Name I/O Description Processing Operation
33 XT2 - Sub clock resonator connection terminal
34 REGC - Capacitor conection terminal for regulator inside
microprocessor
Oscillation : POWER ON mode, Oscillation stop :
35 X2 - Main clock resonator connection terminal POWER OFF mode or momentary power down
detected
36 X1 I Main clock resonator connection terminal
37 VSS - Ground connection terminal Connected to GND lines.
38 VDD - Positive power supply connection terminal Connected to BU 5V lines.
39 CLKOUT O Internal system clock output Not used (N.C.)
40,41 N.C. O Not used (N.C.)
42 TYPE0 I Destination type selection terminal 0
43 TYPE1 I Destination type selection terminal 1
44 TYPE2 I Destination type selection terminal 2
45 N.C. O Not used (N.C.)
46 IC2 TYPE0 I IC2 setting terminal Lo : Initial value
47 IC2 TYPE1 I IC2 setting terminal Lo : Initial value
48 CH-REQH O Request output to changers Lo : Request
49 CH-RST O Reset output to changers : Reset
50 CH-MUTE I Mute request from changers Hi : Mute request
51 CH-CON O Changer control Lo : Standby mode, Hi : Operation mode
52 ILL-ON O Illumination AVR on/off control output Hi : POWER ON mode except panel detached
53 M-MUTE L I Mute request (L Ch.) from CD MECHA. MI-COM. Lo : Mute request
54 M-MUTE R I Mute request (R Ch.) from CD MECHA. MI-COM. Lo : Mute request
55 BVDD - Positive power supply connection terminal Connected to BU 5V lines.
56 BVSS - Ground connection terminal Connected to GND lines.
57 M-RST O Reset output to CD mechanism MI-COM. Lo : Reset
58 M-STOP O Stop request to CD mechanism MI-COM. Lo : Stop mode, Hi : Operation mode
59 N.C. O Not used (N.C.)
60 LO/EJ I/O CD mechanism loading/Eject switching output Lo : Loading, Hi : Eject, Hi-Z : Stop or Break
61 MOSW O CD mechanism loading motor control output Hi : CD loading/eject action or Break, Lo : other
62 N.C. O Not used (N.C.)
63 CD-SW3 I Down & limit switch detection input Hi : Chucking, Lo : Pickup most inner position
64 DA-SDA/NC O Clock output to D/A converter (V-LED model) Lo : Panel detached, momentary power down
detected
65 LCE O CE output to LCD driver IC
66-69 N.C. O Not used (N.C.)
70 AV CONT O A/D converter reference voltage control output Hi : Active, Connected to AVREF terminal
71 AVDD - A/D converter positive power supply connection Connected to BU 5V lines.
terminal
MICROCOMPUTER’S TERMINAL DESCRIPTION

KDC-V7521/Y
7
Pin No. Pin Name I/O Description Processing Operation
72 AVSS - A/D converter ground connection terminal Connected to GND lines.
73 AVREF I A/D converter reference voltage input terminal
74 PHONE I PHONE detection input 1V or less : TEL MUTE, 2.5V or greater : NAVI
MUTE
75 SRM-SW3 I Mask mechanism position SW3 input Panel : (SW1,SW2,SW3)=(Lo,Lo,Hi)
76 SRM-SW1 I Mask mechanism position SW1 input Angle : (SW1,SW2,SW3)=(Hi,Hi,Lo)
Eject : (SW1,SW2,SW3)=(Hi,Hi,Hi)
77 SRM-SW2 I Mask mechanism position SW2 input Mask : (SW1,SW2,SW3)=(Lo,Lo,Lo)
78 SRM-DET I Mask mechanism detection input Lo : Mechanism detected, Hi : mechanism not
detected
79 NOISE I FM noise detection input
80 S-METER I S-meter input from F/E
81 R-DATA I Data input from the RDS decoder IC Except RDS, RBDS model : Not used (pull down
to GND lines)
82 R-QUAL I Quality input from the RDS decoder IC Except RDS, RBDS model : Not used (pull down
to GND lines)
83 IFC-OUT I F/E IFC OUT input terminal Lo : Station detected, Hi : Not detected
84,85 N.C. I Not used(pull down to GND lines)
Standby : (SRM+B,SRM-B)=(Lo,Lo)
86 SRM-B O SRM mechanism submotor control output Clock wise : (SRM+B,SRM-B)=(Hi,Lo)
Counter clock wise : (SRM+B,SRM-B)=(Lo,Hi)
Break : (SRM+B,SRM-B)=(Hi,Hi)
87 R-CLK I Clock input from the RDS decoder IC Except RDS, RBDS model : Not used (pull down
to GND lines)
88 CH-REQC I Request input from changers Lo : Request
89 KEY-REQ I Communication request from LCD driver IC
90 CD-SW1 I Loading SW detection input Lo : Loading start
91 CD-SW2 I 12cm disc detection SW input Lo : 12cm disc detected
92 SRM+B O SRM mechanism submotor control output
93 BU-DET I Momentary power down detection input
Hi : When momentary power down detected or BU OFF
Lo : BU ON
94 CH-DATAC I Data input from changers
95 CH-DATAH O Data output to changers
96 CH-CLK I/O Clock input/output with changers
97 L-DATA L I Data input from the LCD driver IC
98 L-DATA S O Data output to the LCD driver IC
99 L-CLK I/O Clock output to the LCD driver IC
/Panel detaching detection input(LCD Driver) Lo : Panel attached
100 PAN5V O Panel 5V control Hi : Panel attached, Lo : Panel detached
MICROCOMPUTER’S TERMINAL DESCRIPTION

KDC-V7521/Y
8
1. How to enter the test mode
While holding the FM and Preset 6 keys, reset the unit.
2. How to exit from the test mode
While holding the Preset 6 key, reset the unit.
(Note) The test mode cannot be terminated by ACC OFF,
power OFF or momentary power down.
3. Initial status in the test mode
• Sources : ALL OFF
• Display : All segments are lit.
• Volume : -10 dB (displayed as “30”)
• Loudness : OFF
• CRSC : OFF regardless of the presence of switch-
ing function.
• SYSTEM Q : Flat
• LED : White for no scanning. (VLCD model)
4. Special display in Tuner mode
When any of the following messages is displayed in Tuner
mode, the F/E may be abnormal.
• “TNE2P NG” : The EEPROM is set to the default (un-
stable values) because the F/E was shipped without pass-
ing through the adjustment process, etc.
• “TNCON NG” : Communication with the F/E is not pos-
sible.
5. Forced switching of K3I
Each press of the Preset 6 key in Tuner mode should switch
K3I from AUTO →Forced Wide →Forced Middle →Forced
Narrow →AUTO.
The initial status is AUTO and the display shows these
modes as follows.
• AUTO : FMA
• Forced Wide : FMW
• Forced Middle : FMM
• Forced Narrow : FMN
6. Test mode specifications of the CD receiver
• Forced ejection is inhibited in the reset start operation.
When the unit is reset while a CD is loaded in it, the CD is
not recognized by resetting.
• Each press of the Track Up key jumps to the following
track numbers:
No. 9 →No. 15 →No. 10 →No. 11 →No. 12 →No. 13
→No. 14 →No. 9 (The cycle restarts from here.)
• Each press of the Track Down key jumps to the previous
track number to the track being played.
7. Audio-related specifications
• A short press of the Q key initiates the audio adjustment
mode.
TEST MODE
• Pressing the ✽key on the remote initiates the audio ad-
justment mode.
• Continuous holding of a remote control key is inhibited.
• Bass, Middle and Treble are adjusted in 3 steps of Min /
Center / Max with the Track Up/Down keys.
• Balance is adjusted in 3 steps of Left Max / Center / Right
Max with the Track Up/Down keys.
• Fader is adjusted in 3 steps of Rear Max / Center / Front
Max with the Track Up/Down keys.
• HPF is adjusted in 2 steps of Through/220Hz with the
Track Up/Down keys.
• LPF is adjusted in 2 steps of Through/120Hz with the
Track Up/Down keys.
• Bass f, Bass Q, Bass EXT, Middle f, Middle Q and Treble
f are not dealt with by the audio adjustment.
8. Menu-related specifications
•A short press of the CLK key initiates the Menu mode.
• Pressing the DNPP/SBF key on the remote initiates the
Menu mode.
• Continuous holding of a remote control key is inhibited.
• In the color adjustment mode, pressing the Preset 1 key
sets Red, 2 sets Blue, 3 sets Green and 4 sets Green.
(VLCD model)
• Contrast is adjusted in 3 steps of 0/5/10 and the default is
5. (VLCD model)
9. Backup current measurement
When the unit is reset while ACC is OFF (i.e. by turning
Backup ON), the MUTE terminal goes OFF in 2 seconds in
place of 15 second. (The panel and CD mechanism are
not activated at this time.)
10. Special display when the display is all on
Pressing the Preset keys while the power is ALL OFF dis-
plays the following information.
[PRESET 1] Version display (8 digits, Month/Day/Hour/Minute)
(Display) SYS xxxxxxxx System microcomputer
[PRESET 3] Short press : View power ON time. (The All OFF
period is not counted.)
Long press/hold : Clear power ON time.
(Display) PonTim xxxxx Max. 65535 (hours)
[PRESET 4] Short press : Display CD operation time.
Long press/hold : Clear CD operation time
(Display) CDTime xxxxx Max. 65535 (hours)
[PRESET 5] Short press : Display CD ejection count.
Long press/hold : Clear CD ejection count.
(Display) EjeTim xxxxx Max. 65535 (times)
[PRESET 6] Short press : Display Panel open/close count.
Long press/hold : Clear Panel open/close count.
(Display) PnCnt xxxxx Max. 655350 (times)

11. Other specifications
• Automatic panel closing when a CD is inserted is inhib-
ited. (M&T model)
• Panel operation by turning power OFF/ON is inhibited.
(M&T model)
• Messages such as “CODE OFF” are not displayed when
power is turned ON.
• Pressing the ATT key opens or closes the panel. (M&T
model)
• Pressing the TI (AUTO) key during changer operation turns
2zone ON. 2zone can be turned OFF by pressing the TI
(AUTO) key again.The P/S dot lights while 2zone is ON.
• Pressing and holding the CLK key for a second in theALL
OFF status the Mask Key (security) write mode.
• Security-related information
1. Forced Power ON mode (All models)
Even when the security (Mask key) is approved, resetting
the unit while holding the ATT and Preset 4 keys makes it
possible to turn the power ON for 30 minutes.
After 30 minutes have elapsed, it is not possible to return
to the previous condition unless the unit is reset again.
2. Method of registration of the security code after
EEPROM (Tuner Unit Ass'y) replacement (Code
security model)
1) Enter the test mode. (See 1. How to enter the test mode)
2) Press the CLK key to enter the security registration
mode.
3) Enter the code using the Preset 1/2/3/4 keys.
Example : To enter “3510”
• Press the Preset 1 key 4 times.
• Press the Preset 2 key 6 times.
• Press the Preset 3 key twice.
• Press the Preset 4 key once.
4) Hold down the DISP key for at least 3 seconds and the
message, “RE-ENTER” appears, so once again enter
the code according to step 3) above.
5) Press and hold the DISP key for 3 seconds until “AP-
PROVED” is displayed.
6) Exit from the test mode. (See 2. How to exit from the
test mode)
(Note) All Clear is not applicable to the security code of
this model.
3. Method of writing the Mask key while the
EEPROM is in the initial status
1) Enter the test mode. (See 1. How to enter the test mode)
2) Press the CLK key to enter the Mask key registration
mode. “TRANSMIT1” should be displayed now. The dis-
play at this time should show “< >” in place of “ [ ] ”.
3) Point the Mask key remote toward the light sensor, and
press and hold its key for more than 0.5 second.
4) When “TRANSMIT2” is displayed, press and hold the
key on the Mask key remote for more than 0.5 second
again. The first and second counter codes are not com-
pared at this time.
5) When “APPROVED” is displayed, the write operation is
complete. Now the demonstration mode is initiated and
the test mode is terminated.
(Note) In the same way as previous models, if 30 minutes
have elapsed with no code written, an error occurs
and the power is turned OFF.
4. Method of initializing the Mask key (How to
reset the unit from the Mask key approved
condition to the factory condition)
1) Enter the test mode. (See 1. How to enter the test mode)
2) “TRANSMIT1” is displayed and the Mask key entry re-
quest mode is initiated. The display at this time should
show “ ✽✽ ” in place of “ [ ] ”.
3) Press and hold the key on the Master key remote for
more than 3 seconds.
4) When “TRANSMIT2” is displayed, press and hold the
key on the Master key remote for more than 3 seconds
again.
5) When “APPROVED” is displayed, the Mask key is
cleared, the demonstration mode is initiated, the test
mode is terminated and the unit returns to the factory
condition.
5. Method of clearing all Mask key-related data
1) Enter the test mode. (See 1. How to enter the test mode)
2) Press the CLK key to enter the Mask key registration
mode. “TRANSMIT1” should be displayed now.
3) Point the Master key remote toward the light sensor, and
press and hold its key for more than 3 seconds (until the
level display shows the full condition).
4) When “TRANSMIT2” is displayed, hold the key on the
Mask key remote for more than 3 seconds again. If
“TRANSMIT1” is displayed in place of “TRANSMIT2”,
restart the procedure from step 3).
5) When “APPROVED” is displayed, all security data is
cleared and the unit returns to the condition before Mask
key writing with the EEPROM in the initial status.
9
KDC-V7521/Y
TEST MODE

10
KDC-V7521/Y
Using a DAC that can be varied in 256 steps between 0V
and 5V and varying DAC output voltage, the currents that flow
among R7, R9 and R11 are controlled.As a result, the bright-
ness of red, blue and green is adjusted.
Description of Operation
The voltage output from DAC will be in the step-wise wave-
form as shown in A .
When the output voltage is put through R1-3 and C1-3 low-
pass filters for removing noise and smoothing voltage wave-
forms, we get the voltage waveform of B .
The voltage that went through the low-pass filters is input
to the buffer and that will be the input voltage of the V-I con-
verter in the next stage with the voltage waveform of C .
The V-I converter has the function of supplying electric cur-
rent in proportion to the voltage input.
For example, let us assume that the current flowing in the
red LED is IR, and IR = (Q4 base voltage-VBE) /R7.
From this, IR flows in proportion to Q4 base voltage.
Therefore, V-I converter will supply current in proportion to
the voltage input to red, blue and green LED's, which vary the
brightness of LED's.
The registor between D1 and V-I converter is the protection
registor for limiting power supplied to transistors (Q4-6).
CIRCUIT DESCRIPTION/ATTENTION
R11
R7 R9
R4 R6 R5
4.7 4.7 4.7
C1 C3 C2
VCC
SDA
A
8
7AO2
AO1 1
2
IC1
SCA
6AO3 3
GND
5NC 4
(BOTTOM VIEW)
Q4 Q5 Q6
Q1 Q2 Q3
100k
100k
100k
100k 100k 100k
470 470 270
R12
R8 R10 150
150 220
(B)
(G)
(R)
PAN5V
GND
SDA
SCL
LOW PASS FILTER
DAC
BUFFER
ILL+B
V-I CONVERTER
R1
R2
R3
D1
AB
C
V V V
TTT
: DAC OUT B: BUFFER INPUT C: V-I CONVERTER INPUT
RGB
PROTECTION
RESISTOR
ATTENTION
Assembly pf FPC (Flexible PC board) onto Roller ass’y
Turn Roller ass’y by 2 times.
Hook the end of Roller ass’y to the tongue.
Insert the FPC into the slit of Roller ass’y then release the end of Roller ass’y and the tongue.
tongue
Turn 2 times.
End of Roller ass’y
FPC
Variable Illumination Circuit

11 12
ABCDE
1
2
3
4
5
6
7
FGHIJ
C124
C125
R7
C126
C127
C123
C122
C121
R202
C128
R82
R90
R89
R69
R66
R75
R50
R72
C116
R204
R231
R230
R216
R215R214
R111
R109
R100
R102
R205
R207
R206
R115
R208
R116
R119
C21
R10
W7
C149
C76
C141
R4
R3
X2
CP3
CP6
CP5
CP2
X1
R218
R217
R61
R60
R62
R59
R83
R84
R118
R117
CP1
CP4
R49
EB
BE
E
B
BE
BE
BE
EB
BE
BE
EB
BE
EBBE
BEBE
125 26
50
51
75
76
100
28
15 14 1
9
16
18
IGO
LR
VT
20.0M
4.332M
32.768K
5V
RESET
IFCOUT
X86
W100
L10
FL RR RL
FL RL FR RR
R46
R40
R45
R38
R34
R35
X3
C3
C1
C115
C96
C95
C93 C94
C5
C63
C65
C34
C36
C22
C66
C67
C68
C143
C142
C114
C40
C69
C134
C61
C9
C6
C8
C119
C120
C117
C118
L12
L11
L9
C113
L7
L1
W31 W30
W32
W20
W19 W18 W16
W15
W14 W13
W33
W34
W36
W35
W23
W22
W21
W24
W25
W26
W27
R37
R33
W12
W11
W10
C200
W17
R5 W38
W29 W28
L6
R212
R210
W5
R14
R36
W37
R11
R9
W39
W40
L4
W42
W41
FR
EB
13
12 2
12
112
13
1
8
BE
EB
EBEB
BEBE
24
1
13
24
25
2
11
6
2
1
1
16 9
8
1
2
7
6
IC2
IC14
IC3
Q2
Q32
Q33
Q35
Q51
Q43
Q45
Q50
Q8
Q7
Q3
Q5
Q6
Q15
Q52
IC1
D30
D31
D32
D15
D18
Q1
Q4
D2
D1
Q9
Q25
Q26
D23
D17
D24
D22
D5
D4
D3
D16
D8
D7
D28
D29
D27
IC4
D12
D11
D33
D34
D14
D41
D38
D39
D40
CN4
CN3
CN6
CN1
CN5
WH1
J1
D35
D36
CN7
Q46Q44
D62
D61
D63 D64
CN2
X25-8762-72 (J74-1408-02)
X25-9392-7X (J74-1398-02)
1
KS5
KS2
KI4
KS4
KI1
KS1
KI5
KS3
KI2
KI3
C51
C52 C56
C55
18
19
1
68
RST ATT 12 3 4 5 6 AUTO DISP
FM
AM
3
4
2
CLK
SRC AUD
X16-1892-70 A/2 (J74-1305-12)
X16-154X-XX A/2 (J74-1305-12)
ED1
D51 D50
D52D53
X16 B/2
D23
D24
IC2
D10
D9
D12
D11
D6
D5
D8
D7
D18
D20
D22
D21
D14
D13
D15
D17
D16
PC BOARD (COMPONENT SIDE VIEW)
Refer to the schematic diagram for the values of resistors and capacitors.
IC Q Address
13E
23C
35F
46C
14 3B
14G
24G
32F
45G
55G
65F
74F
84F
92B
15 4E
26 4F
32 5F
33 5F
35 3D
43 5B
44 4B
45 5B
46 4B
50 3C
51 2C
52 4B
X25-XXX2-7X
IC Address
21I
X16-1XXX-XX

1413
KLMNO
1
2
3
4
5
6
7
PQRST
PC BOARD (FOIL SIDE VIEW)
Refer to the schematic diagram for the values of resistors and capacitors.
BEBEBE
E
B
21
43
BE
BE EB BE EB
EBEBEB EB
BEBE
BE
EB
C11
C12
R8
L5
R164
W6
TH1
R162
R163
R161
R156
R157
R137
R155
R171
R170
R172
R169
R136
C7
R13
R19
R15
R130
R134
R135
R133
R131
R132
R233
R236
R237
R234
R235
R240
R239
R238
R159
R77
R76
R81
R80 R79
R93
R98
R97
R96 R88
R86
C133
R67
R73
R47
R48
R158
R74
C131
R71
R200
R168R167
C135
R201
R166
R152
R151
R165
C137
R223
R222
R221
R224
R220
R213
R211
R108
R107
R106
R110
R105
R101
R99
R104
R103
R112
C161
R150
R114 R113
C43
C42
C41
C44
C48
C46
C39
C20
C38
C37
C35
C75
C74 C73
C140
C160
C62
C72
C71 C70
R16 R18
R17
R6
R43
C144
R41
R39
C146
R20
R42
C145
C4
R2
R1
C2
R44
R243
C45
R68
C151
C139
C153
C152
C147
C148
R203
R52
R54
R51
R53
R85
1
5
610
17
8
14
Q10
IC8
IC15
Q38Q39 Q40 Q37
Q31
Q11
Q12
Q28
Q29
Q30
Q27
Q13
Q24
Q14
Q36
IC16
Q53
D60
D26
D25
X25-9392-7X (J74-1398-02)
X25-8762-72 (J74-1408-02)
C53
C50
C57
C54
R55
R58
R61 R52
R11
R9
C67
R64
R65
R66
R63
C66
C65
R62
R18
R17
R19
C7
C6
R23
R21
R20
R22
C58
R14
R15
R16
R27
R28
R13
R4
R5
R6
R1
R2
R3
R7
C59
R12
C61
R8
C60
R10
R50
C64
C63
C3
C5
C4
C2
C62 C68
R68
C1
R67
R51
R53
R54
R56
R60
C13
R59
R57
C14
CP1
CP54 CP55
CP2
CP3
CP56
CP53
CP51
CP50
CP52
EB
BE BE EBBEEB
BE
BE
KS1
KI5
KS4
KI1
KS5
KS3
KI2
KS2
DGND
ILLUM G
L-CE L-CLK
VDD
L-DATAL
L-DATAS
RESET
KI4
DA-SCL
DA-SDA
REMO
KI3
S.GND
ILL+B
1
45
8
100
76
75
51 50 26 25
1
113
C
EE
B
B
C
Q53-55
Q50-52
E
CB
EB
C
Q50
Q51
Q52
Q53 Q54
Q55
IC3
Q3
Q4
Q62
Q63
Q64
Q1
Q5
Q6
IC1
S28
D26
J1
X16-1892-70 A/2 (J74-1305-12)
X16-154X-XX A/2 (J74-1305-12)
X16 B/2
IC Q Address
15L
33L
16L
34L
44L
56L
63L
50 6L
51 6L
52 6L
53 3L
54 3L
55 3L
62 4L
63 4L
64 4L
X16-1XXX-XX
IC Q Address
84Q
15 2S
16 2P
10 2O
11 2O
12 2N
13 2O
14 4P
27 4O
28 4O
29 4O
30 4P
31 4P
36 4S
37 6O
38 6O
39 6N
40 6N
53 3Q
X25-XXX2-7X

ABCDEFGHIJ
1
2
3
4
5
6
7
D3
Q5
SW 5V
Q8
D4
Q13
Q4
D2
D1
Q2
Q1
Q3
DETECTION SW
SMALL LAMP
Q6
Q9
Q7
Q11
Q10
Q15
D11
D12
D14 Q26
CN6
ILL +B
Q12
PAN 5V
Q51
DETECTION
SW
Q29
P-CON SW
B.U.
Q30
Q31
MUTE
LOGIC
Q27
Q28
D17
for Rch.
MUTE DRIVER
D36 D35
D34
D33
POWER IC
D41
D40 D39 D38
Q37Q38
Q14 EXT.AMP
CON.SW
J1
CN2 CN1
Q32 Q33
MUTE SW
E. VOL
CN4
D7
D8
D5
CORD
RCA REAR FRONT
SP OUT/DC IN
CH-IN
D15
D29
D27
D28
D32
D30
D31
Q39 Q40
Q50
D63
D64
D61
D62
Q35 Q36
IC1 :
IC2 : TDA7407D
IC3 : M5237ML
IC4 : TA8273H
IC8 : HD74HC02FP or
TC74HC02AF or
IC16 : S-80837ANNP
IC15 : LB1930M
IC14 : TDA7479D
Q1,4 : 2SB1548(P)
Q2,11,30,31,36,52 : 2SC4081 or
2SD1819A
Q3,27,51 : 2SA1576A or
2SB1218A
Q5,8,12,15,50,53 : UN5213 or
DTC144EUA
Q6,7,13,28,32,33 : KRA303 or
DTA124EUA
Q9 : 2SD2375
Q10 : 2SB1184
Q14 : KRA105S or
DTA123JK
Q29 : UN5214 or
DTC114YUA
Q26,44,46 : 2SB1277(Q,R)
Q35,43,45 : UN5212 or
DTC124EUA
Q37-40 : KRC410 or
DTC143TUA
D1 : S2V20
D2 : 1GWJ43
D3,16 : MA4056(N)-M
D4 : MA4082(N)-L or
HZS9A2L
D5 : MA4110-L
D7 : MA4056-M
D8 : MA4047-M or
HZS5B1
D11,12,14,33-36,38-41
: AM01Z or
DSM1SD2 or
ERA15-02
D15,18,30-32,61-64 : 1SS133
D17 : MA4062(N)-M or
D22-24,29 : MA4062-L or
HZS6C1
D25,26 : RD6.8M(B2)
D27,28 : MA4068(N)-M
A
D16
B LINE
GND LINE
SIGNAL LINE
D26
D25
UPD703033GC139
HZS6C2L
D60 IMSA-6801 or:SA-C2012-101TB
E. VOL &
N. C. MPX IC
AVR IC
BU 5V
AVR A8V AVR
(X25-9392-7X/8762-72)
SW
AVR
SW14V
SW
SERVO
+B AVR
AVR
ILL +B
SW
P-CON.
PROTECTION SW
INHIBIT SW
P-CON. PROTECTION
DETECTION
SW
ACC
MUTE DRIVER
for Lch.
NOISE
BUFFER
AUDIO MUTE
SW(FRONT L)
SW(FRONT R)
AUDIO MUTEAUDIO MUTE
SW(REAR R)
AUDIO MUTE
SW(REAR L)
SW
74VHC02SJ
ERA15-01 or
A8V
22K22K
22K
22K
47K
47K
47K
22K
22K
47K
22K
22K
47K
47K
47K
10K
22K
22K
22K 22K
47K
2.2K
47K
47K
4.7K 4.7K 4.7K 4.7K
47K
47K
22K
22K
5.0V
14.4V
7.6V
9.0V
0V
0V
13.8V
1.25V
0V
7.6V
1.4V
4.1V
7.6V
5.0V 5.0V
4.1V
4.1V
4.1V
4.1V
4.1V
4.1V
5.0V
4.1V
4.2V
4.2V
4.9V
4.1V
4.1V
4.1V
4.1V
8.3V
3.6V
0-5.0V
0V
5.0V
0V
0V
0V
5.0V
0V
5.0V
5.0V
4.1V
0V
7.6V
7.6V
7.6V
1.4V
1.4V
7.6V
0V
0V
7.6V
0V
0V
1.4V
1.4V
0V
14.4V
8.3V
5.0V
14.4V
7.6V
10.7V
IC3
IC8
IC4
ELECTRIC UNIT (X25-9392-7X/8762-72)
IC2
DC CORD
(E30-4956-05) : KDC-V7521
(E30-4942-05) : KDC-V7521Y
R45
R39
22K
R11
+
R9
C9 100u10
VIN
R4 2.2K
C2 2200P
R3
C4
10u16
220u16
C6 100u6.3
+
C3
+
C5
22K
R1 100 R2
+
GND
4.3K
R7
220u10
C8
+
1K
100K
R20
Q15
C1 3300u16
+
220
R5
R16
0.01
C20
R17
47K
C21
0.022
24K
15K
R6
R8
1
C7
27
C22
+
1u50
25
15
R38
1K 1/2W
R37 4.7K
3.3u35
C34
R33 4.7K
4
3
W5
DA-SDA
ILLMG
ILL+B
RST
R233 R234 R236 R235 R237
124 53 67
470
1K
4.7K
470
1K
REMO
DA-SCL
NC
DGND
VDD
R239
108911 12 13
1K
99 65 98
97 64
47K
R231
93
11
R43
5.6K R47
18K
Q26,29
1/2W
28
C39
0.01
1
2
3
4
100K
0.068
C36
+
0.1u50
R40 1K
R42
12K
1000P
C37
+
C35
R41
12K
C48 0.01
14 13 12
R46
C38
47K
0.01
3.3K
1/2W
12
11
5 6
7
10 9 8
1u50
C115
+
R204
R203
0.47u50
C113
+
FR
RR
9
19
2
FL
Q37
8.2K
R202
R201
100
FL
RL
1.5K
TH1
10u16
+360
R161
13
FRA
RRA
FRB
RRB
C120
0.22u50
C118
0.22u50
+
22K
R206
22K
R208
22u16
C114
8
TAB GND2 OUT2- STBY OUT2+ VCC2 OUT1-
1
2
3 5 6
7 4
IN1 IN2 OUT1+ RIP GND1
9
10
11
12
C119
0.22u50 0.22u50
C117
RLA
22K
R205
22K
R207
FLA
RLB
FLB
22K22K
OUT4+ IN4 IN3 AUX IN OUT3+ GND3 OUT3- VCC1 PRE-GND
14
15 16
17
18 19 20
21
CD MUTE OUT4- GND4
22
23
24
25
180
R169 R170
Rch Rch Lch GND B.U. GND
RRA
FRA
RRB
FRB
RLB
FLA
FLB
RLA
560
15
14
R13
10K 10K
R19 R15
1K
Q14
10
REAR Lch-
FRONT Lch+
REAR Lch+
FRONT Lch-
87
9
FRONT Rch-
REAR Rch-
FRONT Rch+
REAR Rch+
ACC
PHONE
P-CON
EXT CONT
P-ANT
GND
ILLUM
3
4
2
32654
1311 12 14 15
1
16
21
C12 0.1 C11 0.1
2134
FR 10u16
+360
R162
Q33
180
Rch Lch A GND Lch GND
56
+ + +
C67 0.47u50 C68 0.47u50
C69 47u6.3 R157
R155 R156
231
13
2
R14
F1 10A
MUT
MUT
140uH
VDD
GND
30
C116 0.1
31
31
4.7K
R230
22K 14
+
360
R163
360
R164
RL
RR
10u16
+
10u16
22K 22K
180
R171
180
R172
1 2 3 4 5 6 7 8 9 10 11 12 13 14
VREF
CREF
L
R
CDR
CDG
CDL
PH-
AFS
AM
MPX
LEVEL
MPIN
MPOUT
28
27
26 25
24
23
22
21
20
19 18
17
16 15
ACOUTL ACOUTR OUT FL OUT FR OUT RL OUT RR VDD GND SDA SCL SMUTE QUAL OUTR OUTL
2.2u50
+
0.47u50
+
0.47u50
+4
8
47u10
C61
+
0.01
C62
1K
R158
0.033
0.47
R150 4.7K
R151 10K
C73 0.01
C71 150P
R152 4.7K
C75 0.1 C74 0.1
20
52
10K
R200
4.7uH
L4
R10
2.2
L CE
L CLK
L DATA L
L DATAS
470 17
R240
1K 10
100
21
FL
FR
RL
RR
R165R166R168R167
C93
C94
C95 C96
11
13
79
4.7K
R159
4.7uH
L6
0.047
C161
SDA
SCL
3
24
R48
22K
R44
22K 26
74
0.01
+B
2200P
C152
GND4
C72
C70
10
4.7
10
C66 C65 C63
47K
Q12,13
Q27
Q28
Q32
Q38
Q39
Q40
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
PAN5V
SW5V SW5V
SW5V
SW5V
A8V
A8V
A8V
A8V A8V
BU
BU
BU
BU
BU
BU
+B
BU
BU
BU
BU
BU
BU
BU
BU
BU
C151
2200P
C153
0.022
B.U.
GND1
R238
21 243561213
ILLUMI
16
YEL 1BLK
WHT
GRY/BLK
WHT/BLK
GRY
BLU/WHT
BLU/WHT
REV
10 7RL-
EXT. CONT. 13 4
ORG/WHT
TEL MUTE 314
15 2
BRN
VIOL/BLK
PNK/BLK
RR+
RR- VIOL 12 5 11 6
GRN/BLK
RL+ GRN 98
FL-
ANT CON
P.CON
FR+
FR-
FL+
RL-
RR-
RR+
1
FL+
FR-
FR+
RL+
FL-
357
2
B
2
1
A
468
4
35
6
7
8
BU
GND
S8V
S8V
L1
Vref
1.5K
S8V
P. CON
MODEL NAME X25-9392-70/8762-72 UNIT No.
X25-9392-71
KDC-V7521
KDC-V7521Y

KLMNOPQRST
CAUTION : For continued safety, replace safety
critical components only with manufacturer's rec-
ommended parts (refer to parts list).
!
Indicates safety critical components. To reduce
the risk of electric shock, leakage-current or resis-
tance measurements shall be carried out (exposed
parts are acceptably insulated from the supply
circuit) before the appliance is returned to the
customer.
•DC voltages are as measured with a high imped-
ance voltmeter. Values may vary slightly due to
variations between individual instruments or/
and units.
CN5
CN3
CN7
RDS
DECODER
Q44
AM+B Q45 Q46
FM+B Q43
WH1
A1
CH CORD
to CD MECHA. (X32-5170)
ANT.
TUNER
D22
D23
D24
Q53
D18
Q52
(X16-118X-XX)
D60
SYSTEM
MI-COM.
SW
SW
COMPOSITE SIGNAL
OUTPUT BUFFER
IFC
BUFFER
DRIVER
IC
MOTOR
RESET IC
2/2
X16-
J1
J1
PS2
M
PS3
PS1
PM1
22K
22K
22K
22K
47K
47K
5.0V
5.0V
5V
0V
7.6V
5.0V
0V 0V
7.6V
0V
5V
5V
0V
2.5V
2.5V
5.0v 0V 0V
5.0V
0V
5.0V
5.0V
0V
0V
0V
5.0V
0V
5.0V
0V
5.0V
0V
0V
5.0V
5.0V
0V
0V
5.0V
0V
5.0V 0V
5.0V
3.5V
0V
5.0V
0V or 5.0V
0V
5.0V
0V
5.0V
5.0V
0V
5.0V
0V
5.0V
0V
5.0V
0V
0V or 5.0V
2.6V or 5.0V
5.0V
0V
1.6V
0V
0-5.0V 0-4.2V
5.0V
0V
5.0V
0V
0V
5.0V
0V
5.0V
5.0V
0V
0V
5.0V
5.0V
0V
5.0V
0V
5.0V
0V
0V
4.7V 0V
5.0V
0V
5.0V
5.0V
0V
0V
0V
5.0V
5.0V
0V
5.0V
0V
5.0V
5.0V
0V
5.0V
0V
0V
0V
5.0V
0V
5.0V
0V
5.0V
0V
7.6V
0V
5.0V
5.0V
0V
5.0V
8.3V
7.6V
8.3V
5.0V
IC1
IC14
IC15
KDC-V7521/V7521Y (1/2)
IC16 (X16-118X-XX)
A
SUB-CIRCUIT UNIT
MASK MECHA
29
96
R224 2.2K
SW2
D OUT
22 21
R222 2.2K R223 2.2K
R67
MOSW
MUTE L
MS CLK
MUTE R
SW1
MS DA
NC
BU 5V
D GND
M STOP
AUDIO +B
M RST
GND
Rch
Lch
LO/EJ
SERVO SERVO
SW3
4
R220 100K R221 100K
1220 19 18 17 15 14 13 16 11 10 97 65 8
4
8
1
321
2
CLK REQ H REQ C CH RST DATA C DATA H CH CON CH MUTE
R132 100
R131 4.7K R135 4.7K
R133 100
R130 4.7K
R134 100
R137 4.7K R136 4.7K
54321876
91 61
47u6.3
53
SCL
90
SDA
54
58
57 60
+
0.01
C41
C40
63
1
2
4
R102 1K
R105 470
9
100
AM+B FM+B AFS PLL-DATA EVDD EVSS
1
2
3
4
5 6
7
8
CH-CLK
99
98 MC-DATA/L-DATAS
SC-DATA/L-DATAL
97
BU-DET
P-MUTE P-STBY IC2-SCL PRE-MUTE R IC2-SDA BEEP DA-SCA/DIM-CON TEST
10
12
13
14
REMO PRE-MUTE L
11
15 16
17
18 19 20
22
23
21 MUTE
DIMMER
25
24
26
SW5V
27
EX-AMP-CONT
28
P-CON
ANT-CON
95
SRM+B
94
92
93
CD-SW1
CD-SW2
SC-REQ/KEY-REQ
90
91
89
R-CLK
CH-REQC
SRM-B
87
88
XT2
31
30
P-ON
33
32
XT1
RESET
X2 35
REGC 34
36
CLKOUT
VSS 37
X1
39
VDD 38
40
79
83
86
84
85
R-QUAL
IFC-OUT
R-DATA
81
82
80 S-METER
SRM-DET
NOISE
77
78
76
SRM-SW2
SRM-SW1
SRM-SW3
PHONE
AVREF
AVSS
46
43
41
42
TYPE0
44
TYPE1
45
ILL-ON
M-MUTE R
M-MUTE L
CD-SW3
MOSW
LO/EJ
MC-REQ/PANEL//L-CE
M-RST
BVSS
BVDD
CH-RST
IC2 TYPE1 47
IC2 TYPE0
48
CH-CON
50
CH-MUTE
49
72 75 74 73 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
GND EXTRES
+
C143
C144
10u16
0.01
7
8FILOUT FSEL
ARI TM 10
9
0.22
S-GND P-GND
OSCO
C142
C141
330P
5
6
3
10u16
4
+
MPX OSCI
OSEL VCC 12
11
VREF C146
X3
13 10P
1
2
82
81
16
QUAL
RDDA
RDCK
T57
C145
15
14 10P
87
4
78
10
1
3
4
5
92
86 IN1
IN2 NC
OUT2
2
VCC NC
NC OUT1
8
7
6
93
677
5
7
0.01
C137
IF1 +B
24 IF1 GND
AMIF OUT
22 S-METER
23
20 AUDIO OUT
21
SDA
5
4.7uH
L12
18
RDS OUT
19 NOISE OUT
VDD 5V
17
15 SCL
DIG GND
16
4
PLL +B
13 IFC OUT
14
12
10 OSC GND
11 VT
OSC GND
8
9W/N
1
4.7uH
Q43,44
L10
1
Q45,46
1K R213
22K
R212 4.7uH
2R211
22K
R210
1K
4
0.22
C133
AM +B
OSC GND
7
5
OSC GND
FM +B
6
0.01
C131
3AM ANT
2RF GND
FM ANT
L9
2
1
4.332MHz
GND
+B
94
95
51
88
48
49
50
96
ACC-DET
CH-REQH
DA-SCL/NC
M-STOP
AVDD
AVCONT
CH-DATAH
CH-DATAC
MC-CLK//L-CLK/PANEL
PAN5V
27
28
24
25
26
52
R103 470
PLL-CLK5R106 4.7K
R104 4.7K
30
1K
R50
20 R113 47K
9
19
12
11
SCL
SDA R109 1K
R111 1K
R112 10K R110 10K
21
R1115 100K
C42 22P
C43 27P
C44 1
32.768kHz
X2
20.0MHz
X1
10K
R49
R52 100K
R54 100K
R60 100K
R62 100K
50
48
49
51
R100 1K
R98
1K
93
97
100
99
96
95
94
R82 1K
R96 100K
R93 100K
R88 100K
R79 2.2K
C46 1000P
R77 2.2K
R75 1K
R76
100K
R74
2.2K
R73
2.2K
R85
R72 1K
2.2K
R69 2.2K
R117 1K R118 1K
31
64
65 57 60
58
61
63
53
54
90
91
3
1
2
C1470.22
C148
75
76
76
77
75
79
78
86
88
87
83
82
81
80
92
2.2K
R214
R216 2.2K
R215 2.2K
4.7uH
L11
0.01
C135
1000P
C139
47K
R243
83
13
11
10K
31
1K
R217
4.7K
R218
80
UNITMODEL
KDC-V7521 2-71
KDC-V7521Y
NAME 0-10 No.
R119 470
17
R107
R108
10
R116
2.2K
C140
0.47
47u10
C134
+
0.047
C160
R83 470
CP5
CP1
R89 1K
100K
R90
L5
98 1K
R97
R101 1M
R66
100K
10
C45
SCL
SDA
2.2M
2.2K
R114 10K
470
R84
NC 74
MPX
MPX
GND5
52mH
L7
GND6
R56 100K
TYPE2
BU5V
BU5V BU5V
BU5V
BU5V BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
BU5V
SW5V
SW5V
SW5V SW5V
SW5V
SW5V SW5V
SW5V
SW5V
SW5V
SW5V
A8V
A8V A8V
A8V
A8V
A8V A8V
A8VA8V
A8V
+B
A8V
A8V
220
R68
78564321
3
4
3
DA-SCL
L DATA L
L DATA S
L CE
ILLUMG
L CLK
ILL +B 13
11
12
RST 9
10
7
8
DA-SDA
NC
REMO 5
6
4
DGND
VDD 2 1
5
3
2
4
6
7
8
9
10
11
12
13
14
15
1
100x2
CP3 1Kx2 CP2
1Kx2
100Kx2
CP4
1Kx2
2.2Kx2
CP6
GND VCC
OUT
S8V
S8V
VDD
DA-SCL
NC
REMO
DGND
DA-SDA
L DATA S
L DATA L
RST
L CE
ILLUMG
L CLK
ILL +B
S.GND
S.GND
S8V
S8V
S8V
S8V
SRM SUB+
SRM SW2
SRM DET
GND
SRM SW3
SRM SW1
SRM SUB-
1
3
2
54
7
6
DTA124JK
DTC114YUA
DTC143TUA
UN5213
UN5214
2SA1576A
2SB1218A
2SD1819A
2SB1184
2SB1548 2SB1277 2SC4081
UNX2N DTA114EUA
DTA124EUA
DTC124EUA
DTC144EUA
RD6. 8M
TC74HC02AF
UN5212
M5237ML
LB1930M TDA7479D
(1/2)

UVWXY
1
2
3
4
5
6
7
ZAA AB AC AD
10.7V
0V
5.0V
0V
0V
0V
5V
5.0V
8.5V
6.8V
5.1V
3.4V
1.7V
0V
5.0V
0V
0V
5.0V
5.0V
0V
0V-5.0V
J1
D7 D6 D5
D10 D9 D8
D18 D15 D14
D22 D16
D21 D20 D17
D13 D12 D11
D23
S1
VOL-
S2
S4 ATT S5
S9
4
S11
6S12
S8
S10
TI
5
2
S7
1
S6 SRC S22
S26
AM
FM
EJECT
S15
S17S16
S18
S14
S24
S20
dB
S25
S13
DISP Q3
1/2
X16-
J1
IC1 : LC75808W
IC2 : RS-171
Q1,6 : DTA114EUA or
Q3-5,62-64 : 2SC4081
Q4
Q5
Q6
B30-1599-05D50-53 :
D26 :
LCD DRIVER
Q1
S3
RST
VOL+
3
S21
CLK
S27
S19
S23
UMX2NQ50-55 :
B30-1605-05D5-18,20-22 : B30-1564-05D23,24 :
OPEN
S28
D26
D24
B LINE
GND LINE
KRA302
REMO
SW
RED LED SW
GREEN
LED SW
AVR
VLCD KEY
SW
PERMISSION
M62333FPIC3 :
MA3082-L
REMOTE
SENSOR IC
Q64
Q63
Q62
D50
D51
Q50
Q51
Q52 Q55
D53
D52
Q54
Q53
DAC
BUFFER
CONSTANT
DRIVER
CURRENT
118
10K
10K
10K
10K
A
KDC-V7521/Y (2/2)
IC1
IC2
SWICTH UNIT (X16-1XXX-XX)
IC3
ED1(COMMON)
ED1(SEGMENT)
2
3
4
5
6
7
8
9
10
11
12
13
ILL+B
ILLUM G
L CLK
L CE
RESET
L DATAS
L DATAL
DA SDA
DA SCL
REMO
NC
D GND
330
R17
510
R22
R23
270
C13 0.01
KS3 KS5
KS2
KS1
KI1
KI2
KI3
KI4
1K
10K
R15
1Kx4
CP2
KI1
KI4
KI3
KI2
4.7
R11
KI5
75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
27
26
1
2
3
4
5 6
7
8 9
10
11
12
13
14
15 16
17
18 19 20
21
22
23
24
25
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
KS5
KS4
KS3
KS2
KS1
COM1
COM2
COM3
COM4
COM5 COM6
COM7
COM8 COM9
COM10
S60 S59 S58
S57
S56 S55
S54
S53
S52
S51
S45
S44
S43
S42
S41
S40
S39
S38
S37
S36
S35
S34
S33
S32
S31
S30
S29
S28
S27
S26
S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25
KI5
REMO
RED
GREEN
KEY
VDD
VLCD
VLCD0
VLCD1
VLCD2
VLCD3
VLCD4
VSS
TEST
OSC
INH
DO
CE
CL
DI
S4
S3
S2
S1
S10
S8
S7
S6 S5 S9
S15
S14
S13
S12
S11
S20 S19 S18
S17
S16
S21
S22
S23
S38
S34
S32
S31
S33
S36
S35
S37
S46
S42
S40
S39
S41
S44
S43
S45
S47
S50
S30
S29
S60 S59 S58
S57
S56 S55
S54
S53
S52
S51
C4
C1
C8
C2
C3
C7
C5 C6
KS1
KS4
KS2
KS3
CP3
1Kx4
10K
R16
R5
C4 0.1
C3 0.1
R4
C2 0.1
R3
0.1
100
R9 2.2
C7
S49
S48
S25
S24
S50
S46
S47
S48
S49
28
29
30
31
32
S28
S27
S26
79 KI3
78 KI2
KI4
80
KI1
77 KS6
76
KI5 R13 1K
84
83
1
VDD
S.GND
R10
CP1
470x4
22K
97
98
99
100
97
98
99
100
C1 680P
R1 43K
GND2
VCC
4
3
GND1
OUT
1
2
KS5
R14 1K
R18
330
R19
330
R20
330
R21
330
84
83
KS4
SDA
3.9K
R6
2.2K2.2K2.2K
R2
2.2K
2.2
R7 22K
360
R8
S.GND
10K
R28 10K
R27
C14 0.01
+B
KDC-V7521Y
MODEL NAME
KDC-V7521
+B +B
+B
+5V
+5V
+B
+5V
+5V
+B
+B +B
+B
+B
SCL
470x2
CP56
C6
8 7 6 5
VCC
SCL
SCA
GND
1
2
3
4
A01 A02 A03 NC
C5
R12
Q5
4.7
R66
SDA
SCL
R67 10K R68 10K
IC2
Q6
100Kx4
CP55
B
G
R
C67 4.7
C66 4.7
C65 4.7
CP54
100Kx4
C68
1
1
2
4
3
R50 150
R52
220
R51 150
470x2
CP50
R53 150
4
3
2R54 150
220
R55
1
BR
G
G
R
B
1
2
34
5
6
470x2
CP51
1
2
34
5
6
1
2
34
5
6
R62 270
R63 270
+B +B
C50 0.01
C53 0.01
0.01
C52
C58
C59
0.01
0.01
C51 0.01
B
51
G
R
4
0.01
2
3
R65 270
43
6
5
1
2
470x2
CP53
R64 270
R61
220
4
R59 150
R60 150 3
CP52
4
C57 0.01
C56 0.01
C61
C55 0.01 C60 0.01
2
3
C54 0.01
1
R58
6
R
1
2
220
B
G
470x2
2
5
R56 150
4
R57 150 3
61
14
15
IC3
Q62-64
Q50-55
UNIT No.
X16-1542-71
X16-1540-10
UNIT No.
X16-1892-70
SEG17 35
SEG17 35
SEG59
9
COM1
1
COM8 COM3 COM4 COM6 COM5 COM7 COM2
3
2
5
4 7
6 8
SEG52
17
SEG53 SEG54 SEG57 SEG58 SEG56 SEG55 SEG60
13
11
10
12
15
14
16
SEG51
18
SEG1 19
SSEG9 27
SEG8
SEG7
SEG6 SEG5
SEG4
SEG3
SEG2 21
20 22 23 24 25 26
SEG16
SEG14
SEG15
SEG12
SEG10
SEG11
SEG13 31
29 28 30 33 32 34
S1
SEG1 19
27
SEG9
SEG5 SEG3
SEG4
SEG2 21
20 22 23
SEG8
SEG7
SEG6 24
25 26
S5 S3
S2
S4
S6 S8
S7
31SEG13
SEG12
SEG11
SEG10 29
28 30
SEG14
SEG15 SEG16 33
32 34
S9
S10
S11
S12
S14
S13 S15 S16
SEG25 43
SEG24
SEG22
SEG23 SEG20 SEG18 SEG19
SEG21 39
37 36 38 41 40 42
SEG32
SEG31
SEG30 SEG29 SEG28 SEG26
SEG27 45
44 46 47 48 50 49
SEG39 SEG40 SEG38
SEG37
SEG36 SEG35 SEG33
SEG34 51
52 53 54 56 55 57 58
SEG48
SEG47
SEG46 SEG45 SEG43
SEG44
SEG42
SEG41 59
60 62 61 63 64 65 66
COM1 SEG52
S60
SEG49 SEG50 68
67
S56
S57
S59 S58 S53
S54
S55
COM3 COM2 COM4 COM5 COM6 COM7 COM8 SEG60 SEG58 SEG59 SEG57 SEG56 SEG54 SEG55 SEG53
S51
S52 SEG51
S32
43SEG25 39SEG21
SEG20 SEG19 SEG18 37
36 38
SEG22
SEG23
SEG24 41
40 42
S17
S18 S20 S19
S21
S22
S23
S24
SEG26
SEG27
SEG28 45
44 46
SEG32
SEG31
SEG30 SEG29 47
48 50 49
S28 S26 S25
S27
S30 S29
S31
S40
SEG36 SEG35 SEG33
SEG34 51
52 53 54
SEG38 SEG39 SEG40
SEG37 56
55 57 58
S36
S34
S33 S35 S38
S37
S39
SEG42
SEG43
SEG44
SEG41 59
60 62 61
SEG48
SEG47
SEG46 SEG45 63
64 65 66
S44
S42
S41
S43 S46 S45
S47
SEG50 SEG49 68
67 S49
S48 S50
5 9
10
7
8 6 3
4
2
1
17
18 15 16 13
14
12
11
C1
C5
C4
C2
C3
C7
C8 C6
CAUTION : For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list).
!
Indicates safety critical components. To reduce the risk of electric shock, leakage-current or resistance measurements shall be carried out
(exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.
• DC voltages are as measured with a high impedance voltmeter. Values may vary slightly due to variations between individual instruments or/
and units.

21
KDC-V7521/Y
N
N
N
M
M
N
(X16-1XXX-XX)
(X25-XXXX-XX)
PS2
PS3
PS1 PM1
PFPC1
J1
FPC1
LE
K
Q
Q
Q
D
L
BB
A
A
F
J
J
B
B
P
x2
D
A
G
H
B
B
B
B
C
F
RC1
PME1
DC1
RC2
FC1
244
245
F1
P
P
P
P
x2
T x2
P
P
T
P
P
R
SSS
S
WH1
IC4
DME1
ED1 304
304
303 302
301
M2x2 (BLK)
M2x2.5
φ2x4
M2x2.5
M2x1.8 (BLK)
FLAT WASHER
FLAT WASHER
FLAT WASHER
RETAINING RING
RETAINING RING
M2x2.5
φ2x5
φ2x8 (BLK)
φ3x5
φ2x4 (BLK)
φ3x8
φ3x12
φ2.6x6
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
N09-4400-05
N09-4401-05
N09-4427-05
N09-4448-05
N09-4449-05
N19-2154-04
N19-2155-04
N19-2156-04
N29-0523-05
N29-0522-05
N38-2025-46
N80-2005-46
N80-2008-45
N83-3005-46
N86-2004-45
N80-3008-46
N83-3012-46
N86-2606-46
275 213
282
258
789
200 271
255
285
227x2
232
230
231
233
234
204
263
272
257
203
212
229
219
235
236
228
256
262
205
259
269
237
260
261
286
250x4
749
748
770
206
747
701
202
220
(X16-)
(X16-)
806
(X25-)
814 746
790
746 742
(X25-)
813
(X25-)
810
(X25-)
(X25-)
(X25-)
812
(X25-)
811
(X16-)
(X16-)
(X16-) (X16-)
(X16-)
(X16-) (X16-)
PA1
222
277268
278
276
280
281
279
243
714
211 223
AB
3
2
1
Parts with the exploded numbers larger than 700 are not supplied.
EXPLODED VIEW (UNIT)

22
KDC-V7521/Y
✽New parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
PARTS LIST
!
Indicates safety critical components.E: KDC-V7521 E1: KDC-V7521Y
200 1A A02-1497-13 PLASTIC CABINET ASSY
202 1B ✽A52-0808-02 TOP PLATE
203 2A A10-4807-13 CHASSIS CALKING ASSY
204 1A A10-4810-13 CHASSIS CALKING ASSY
205 2A A10-4893-04 CHASSIS CALKING ASSY
206 2A ✽A10-4924-02 CHASSIS
211 3A ✽A21-4171-03 DRESSING PANEL
212 2A A22-2865-03 SUB PANEL ASSY
213 3B ✽A46-1753-01 REAR COVER
PA1 3A ✽A64-2582-02 PANEL ASSY
PME1 2A ✽A10-4921-02 CHASSIS ASSY
RC1 1A ✽A70-2025-05 REMOTE CONTROLLER ASSY (RC-410)
RC2 1A A70-0886-15 REMOTE CONTROLLER ASSY
219 2A B03-3073-12 DRESSING PLATE
220 3B B07-3007-03 ESCUTCHEON ASSY (BLK)
222 3A ✽B10-4161-01 FRONT GLASS
223 3A ✽B10-4222-03 FRONT GLASS
- B46-0100-50 WARRANTY CARD E
- B46-0632-04 ID CARD
-✽B64-2145-00 INST. MANUAL (ENG, RUS) E1
-✽B64-2146-00 INST. MANUAL (POL, CZE, HUN) E1
-✽B64-2147-00 INST. MANUAL (CRO, SWE, FIN) E1
-✽B64-2151-00 INST. MANUAL (ENGLISH) E
-✽B64-2152-00 INST. MANUAL (FRE, GER, DUT) E
-✽B64-2153-00 INST. MANUAL (ITA, SPA, POR) E
227 1A D10-4562-04 LEVER
227 1A D10-4621-04 LEVER E
228 2A D10-4563-04 ARM ASSY
229 2A D10-4590-04 ARM
230 1A D13-2135-04 GEAR ASSY
231 1A D13-2138-04 GEAR
232 1B D13-2139-04 GEAR
233 1A D13-2140-04 GEAR
234 1A D13-2141-14 GEAR ASSY
235 2A D13-2165-03 GEAR ASSY
236 2A D14-0754-04 ROLLER
237 2A D14-0760-03 ROLLER
243 3A ✽E29-1879-02 CONDUCTIVE RUBBER
244 2B E30-4935-05 CORD WITH PINPLUG E1
244 2B E30-4979-05 CORD WITH PINPLUG E
245 2B E30-4946-05 CORD WITH DIN CONNECTOR E1
245 2B E30-4947-05 CORD WITH DIN CONNECTOR
DC1 1A E30-4942-05 DC CORD E1
DC1 1A E30-4956-05 DC CORD E
FC1 1B ✽E39-0462-05 FLAT CABLE (22P)
250 1B F29-0049-05 INSULATING COVER
F1 2B F52-0006-05 FUSE (MINI BLADE TYPE) (10A)
F1 2B F52-0011-05 FUSE (MINI BLADE TYPE) (10A) E1
255 1A G01-2924-04 TORSION COIL SPRING
256 2A G01-3065-04 EXTENSION SPRING
257 2A G01-3066-14 TORSION COIL SPRING
Ref. No. A d
d
N
e
wParts No. Description Desti-
nation Ref. No. A
d
d
N
e
wParts No. Description Desti-
nation
KDC-V7521/Y
258 3B G01-3069-04 EXTENSION SPRING
259 2A G01-3080-04 TORSION COIL SPRING
260 2A G09-2038-04 FORMED WIRE
261 2A G09-2042-04 FORMED WIRE
262 2A G11-1927-04 CUSHION
263 2A G16-1177-04 SHEET
- H10-4762-12 POLYSTYRENE FOAMED FIXTURE E
- H10-4763-12 POLYSTYRENE FOAMED FIXTURE E1
- H25-0329-04 PROTECTION BAG (280X450X0.03) E1
- H25-0337-04 PROTECTION BAG (180X300X0.03)
- H25-1108-04 PROTECTION BAG (100X300X0.03)
- H25-1111-04 PROTECTION BAG (280X450X0.03) E
-✽H54-2330-03 ITEM CARTON CASE E
-✽H54-2338-03 ITEM CARTON CASE E1
268 3A ✽J19-5136-02 HOLDER
269 2A J21-9651-13 MOUNTING HARDWARE ASSY
271 1A J21-9716-03 MOUNTING HARDWARE ASSY
272 3A J90-0999-04 GUIDE
PFPC1 1A J84-0122-04 FLEXIBLE PRINTED WIRING BOARD
275 3A K24-3646-04 KNOB (OPEN)
276 3A ✽K24-3835-04 KNOB (SRC)
277 3A ✽K25-1404-03 KNOB (VOL)
278 3A ✽K25-1405-02 KNOB (PRESET)
279 3A ✽K25-1406-03 KNOB (FM,AM)
280 3A ✽K25-1407-03 KNOB (PROG)
281 3A ✽K25-1408-03 KNOB (UP,DOWN)
282 3A K29-7017-03 KNOB (LOCK)
285 1B N99-1704-05 SCREW SET
A 1A N09-4400-05 MACHINE SCREW (M2X2)
B 1A N09-4401-05 MACHINE SCREW (M2X2.5)
C 1A N09-4427-05 TAPTITE SCREW (S2X4)
D 2A N09-4448-05 MACHINE SCREW (M2X2.5)
E 3A N09-4449-05 MACHINE SCREW (M2X1.8 BLK)
F 1B N19-2154-04 FLAT WASHER (1.6X5X0.25 LUMI)
G 2A N19-2155-04 FLAT WASHER (1.6X5X0.35 LUMI)
H 2A N19-2156-04 FLAT WASHER (1.2X3X0.25 POLY)
J 1A N29-0523-05 RETAINING RING (2X5X0.4)
K 2A N29-0522-05 RETAINING RING (1.5X4X0.4)
L 3A N38-2025-46 PAN HEAD MACHIN SCREW
M 3A N80-2005-46 PAN HEADTAPTITE SCREW
N 2B N80-2008-45 PAN HEADTAPTITE SCREW
P 1B N83-3005-46 PAN HEAD TAPTITE SCREW
Q 2A N86-2004-45 BINDING HEAD TAPTITE SCREW
PS1-3 1A S68-0856-05 PUSH SWITCH
286 1A T90-0523-05 ANTENNA ADAPTOR
286 1A T90-0534-05 ANTENNA ADAPTOR
PM1 1A T42-1034-04 MOTOR ASSY
DME1 1B X92-4030-00 MECHANISM ASSY (DXM-6000W)
J1 2A E58-0903-05 RECTANGULAR RECEPTACLE (15P)
SUB-CIRCUIT UNIT (X16-118X-XX)
!
!
!
!

KDC-V7521/Y
23
SUB-CIRCUIT UNIT (X16-118X-XX)
✽New parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
PARTS LIST
!
Indicates safety critical components.
E: KDC-V7521 E1: KDC-V7521Y
FPC1 2A ✽J84-0121-12 FLEXIBLE PRINTED WIRING BOARD
301 3A B11-1322-04 REFLECTION SHEET
302 3A B11-1323-14 OPTICAL DIFFUSER
303 3A ✽B19-2069-13 LIGHTING BOARD
D5-18 B30-1605-05 LED (2COLOR PG/RED)
D20-22 B30-1605-05 LED (2COLOR PG/RED)
D23, 24 B30-1564-05 LED (1608,BLUE)
D50-53 B30-1599-05 LED (NICHIA FULL)
ED1 3A ✽B38-1087-05 LIQUID CRYSTAL
C1 CC73GCH1H681J CHIP C 680PF J
C2-5 CK73GB1C104K CHIP C 0.10UFK
C2-5 CK73GB1H104K CHIP C 0.10UFK
C6, 7 CK73FB1A225K CHIP C 2.2UF K
C13, 14 CK73GB1H103K CHIP C 0.010UF K
C50-61 CK73GB1H103K CHIP C 0.010UF K
C65-67 CK73FB0J475K CHIP C 4.7UF K
C68 CK73GB0J105K CHIP C 1.0UF K
304 3A ✽E29-1885-04 CONDUCTIVE RUBBER
J1 E59-0835-05 RECTANGULAR PLUG (15P)
CP1 R90-1016-05 MULTI-COMP 470 X4
CP2, 3 R90-0724-05 MULTI-COMP 1K X4
CP50-53 R90-1022-05 MULTI-COMP 470 X2
CP54, 55 R90-0720-05 MULTI-COMP 100K X4
CP56 R90-1022-05 MULTI-COMP 470 X2
R1 RK73GB2A433J CHIP R 43K J 1/10W
R2-5 RK73GB2A222J CHIP R 2.2K J 1/10W
R6 RK73GB2A392J CHIP R 3.9K J 1/10W
R7, 8 RK73GB2A223J CHIP R 22K J 1/10W
R9 RK73GB2A101J CHIP R 100 J 1/10W
R10 RK73GB2A102J CHIP R 1.0K J 1/10W
R11 RK73GB2A4R7J CHIP R 4.7 J 1/10W
R12 RK73GB2A361J CHIP R 360 J 1/10W
R13, 14 RK73GB2A102J CHIP R 1.0K J 1/10W
R15, 16 RK73GB2A103J CHIP R 10K J 1/10W
R17-21 RK73FB2B331J CHIP R 330 J 1/8W
R22 RK73FB2B511J CHIP R 510 J 1/8W
R23 RK73FB2B271J CHIP R 270 J 1/8W
R27, 28 RK73GB2A103J CHIP R 10K J 1/10W
R50, 51 RK73GB2A151J CHIP R 150 J 1/10W
R52 ✽RK73GB2A221J CHIP R 220 J 1/10W
R53, 54 RK73GB2A151J CHIP R 150 J 1/10W
R55 ✽RK73GB2A221J CHIP R 220 J 1/10W
R56, 57 RK73GB2A151J CHIP R 150 J 1/10W
R58 ✽RK73GB2A221J CHIP R 220 J 1/10W
R59, 60 RK73GB2A151J CHIP R 150 J 1/10W
R61 ✽RK73GB2A221J CHIP R 220 J 1/10W
R62-65 ✽RK73GB2A271J CHIP R 270 J 1/10W
R66 RK73GB2A4R7J CHIP R 4.7 J 1/10W
R67, 68 RK73GB2A103J CHIP R 10K J 1/10W
S28 S70-0864-05 TACT SWITCH
D26 MA3082-L ZENER DIODE
Ref. No. A
d
d
N
e
wParts No. Description Desti-
nation Ref. No. A
d
d
N
e
wParts No. Description Desti-
nation
SWITCH UNIT (X16-1XXX-XX)
IC1 LC75808W MOS-IC
IC2 RS-171 ANALOGUE IC
IC3 ✽M62333FP MOS-IC
Q1 DTA114EUA DIGITAL TRANSISTOR
Q1 KRA302 DIGITAL TRANSISTOR
Q3-5 2SC4081 TRANSISTOR
Q6 DTA114EUA DIGITAL TRANSISTOR
Q6 KRA302 DIGITAL TRANSISTOR
Q50-55 UMX2N TRANSISTOR
Q62-64 2SC4081 TRANSISTOR
C1 C90-5242-05 ELECTRO 3300UF 16WV
C2 CK73GB1H222K CHIP C 2200PF K
C3 C90-2866-05 ELECTRO 220UF 16WV
C4 CK73GB1H103K CHIP C 0.010UF K
C5 CE04NW1C100M ELECTRO 10UF 16WV
C6 CE04NW0J101M ELECTRO 100UF 6.3WV
C7 CK73FB1C105K CHIP C 1.0UF K
C8 CE04CW1A221M ELECTRO 220UF 10WV
C9 CE04NW1A101M ELECTRO 100UF 10WV
C11, 12 CK73FB1H104K CHIP C 0.10UF K
C20 CK73GB1H103K CHIP C 0.010UF K
C21 CK73GB1E223K CHIP C 0.022UF K
C21 CK73GB1H223K CHIP C 0.022UF K
C22 CE04NW1H010M ELECTRO 1.0UF 50WV
C34 CE04NW1V3R3M ELECTRO 3.3UF 35WV
C35 CK73GB1C683K CHIP C 0.068UF K
C36 CE04NW1H0R1M ELECTRO 0.1UF 50WV
C37 CK73GB1H102K CHIP C 1000PF K
C38, 39 CK73GB1H103K CHIP C 0.010UF K
C40 CE04NW0J470M ELECTRO 47UF 6.3WV
C41 CK73GB1H103K CHIP C 0.010UF K
C42 CC73GCH1H220J CHIP C 22PF J
C43 CC73GCH1H270J CHIP C 27PF J
C44 CK73GB0J105K CHIP C 1.0UF K
C45 CK73EB0J106K CHIP C 10UF K
C46 CK73GB1H102K CHIP C 1000PF K
C48 CK73GB1H103K CHIP C 0.010UF K
C61 CE04NW1A470M ELECTRO 47UF 10WV
C62 CK73GB1H103K CHIP C 0.010UF K
C63 CE04NW1H2R2M ELECTRO 2.2UF 50WV
C65-68 CE04NW1HR47M ELECTRO 0.47UF 50WV
C69 CE04NW0J470M ELECTRO 47UF 6.3WV
C70 CK73GB1A474K CHIP C 0.47UF K
C71 CC73GCH1H151J CHIP C 150PF J
C72 CK73GB1E333K CHIP C 0.033UF K
C72 CK73GB1H333K CHIP C 0.033UF K
C73 CK73GB1H103K CHIP C 0.010UF K
C74, 75 CK73GB1C104K CHIP C 0.10UF K
C74, 75 CK73GB1H104K CHIP C 0.10UF K
C93-96 C90-2597-05 ELECTRO 10UF 16WV
C113 CE04NW1HR47M ELECTRO 0.47UF 50WV
C114 CE04NW1C220M ELECTRO 22UF 16WV
C115 CE04NW1H010M ELECTRO 1.0UF 50WV
C116 CK73GB1C104K CHIP C 0.10UF K
ELECTRIC CIRCUIT UNIT (X25-XXX2-7X)

KDC-V7521/Y
24
ELECTRIC CIRCUIT UNIT (X25-XXX2-7X)
✽New parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
PARTS LIST
!
Indicates safety critical components.
E: KDC-V7521 E1: KDC-V7521Y
C116 CK73GB1H104K CHIP C 0.10UF K
C117-120 C90-5296-05 NP-ELECT 0.22UF 50WV
C131 CK73GB1H103K CHIP C 0.010UF K
C133 CK73GB1A224K CHIP C 0.22UF K
C134 CE04CW1A470M ELECTRO 47UF 10WV
C135 CK73GB1H103K CHIP C 0.010UF K
C137 CK73GB1H103K CHIP C 0.010UF K
C139 CK73GB1H102K CHIP C 1000PF K
C140 CK73GB1A474K CHIP C 0.47UF K
C141 CC73GCH1H331J CHIP C 330PF J
C142, 143 CE04NW1C100M ELECTRO 10UF 16WV
C144 CK73GB1H103K CHIP C 0.010UF K
C145, 146 CC73GCH1H100D CHIP C 10PF D
C147, 148 CK73GB1A224K CHIP C 0.22UF K
C151, 152 CK73GB1H222K CHIP C 2200PF K
C153 CK73GB1E223K CHIP C 0.022UF K
C153 CK73GB1H223K CHIP C 0.022UF K
C160, 161 CK73GB1E473K CHIP C 0.047UF K
C160, 161 CK73GB1H473K CHIP C 0.047UF K
CN1 E40-3241-05 PIN ASSY (6P)
CN2 E40-3237-05 PIN ASSY (2P)
CN3 E40-3252-05 PIN ASSY (8P)
CN4 E40-3261-05 PIN ASSY (3P)
CN5 E40-9550-05 FLAT CABLE CONNECTOR (22P)
CN6 E40-9557-05 FLAT CABLE CONNECTOR (13P)
CN7 E40-5031-05 FLAT CABLE CONNECTOR (7P)
J1 E58-0863-15 RECTANGULAR RECEPTACLE (16P)
WH1 2B E30-4804-05 CORD WITH PLUG
WH1 2B E30-4932-05 CORD WITH PLUG
L1 L33-1170-05 CHOKE COIL ASSY (140UH)
L4 L40-4795-91 SMALL FIXED INDUCTOR (4.7UH,J)
L5 L92-0075-05 CHIP FERRITE
L6 L40-4795-91 SMALL FIXED INDUCTOR (4.7UH,J)
L7 L33-1039-05 LINE FILTER COIL (52mH)
L9-12 L40-4795-91 SMALL FIXED INDUCTOR (4.7UH,J)
X1 L78-0821-05 RESONATOR (20.0MHz)
X2 L77-2738-05 CRYSTAL RESONATOR (32.768kHz)
X3 L77-2002-05 CRYSTAL RESONATOR (4.332MHz)
P 2B N83-3005-46 PAN HEAD TAPTITE SCREW
R 2B N80-3008-46 PAN HEAD TAPTITE SCREW
S 2B N83-3012-46 PAN HEAD TAPTITE SCREW
T 2B N86-2606-46 BINDING HEAD TAPTITE SCREW
CP1, 2 R90-0725-05 MULTI-COMP 1K X2
CP3 R90-1019-05 MULTI-COMP 100 X2
CP4 R90-0737-05 MULTI-COMP 100K X2
CP5 R90-0725-05 MULTI-COMP 1K X2
CP6 R90-1013-05 MULTI-COMP 2.2K X2
R1 RK73GB2A223J CHIP R 22K J 1/10W
R2 RK73GB2A101J CHIP R 100 J 1/10W
R3 RK73GB2A223J CHIP R 22K J 1/10W
R4 RK73GB2A222J CHIP R 2.2K J 1/10W
R5 RD14BB2C221J RD 220 J 1/6W
R6 RK73GB2A153J CHIP R 15K J 1/10W
R7 R92-3032-05 CHIP R 4.3K D 1/10W
Ref. No. A
d
d
N
e
wParts No. Description Desti-
nation Ref. No. A
d
d
N
e
wParts No. Description Desti-
nation
R8 R92-3047-05 CHIP R 24K D 1/10W
R9 RD14BB2C152J RD 1.5K J 1/6W
R10 ✽RK73EB2E2R2J CHIP R 2.2 J 1/4W
R11 RD14BB2C102J RD 1.0K J 1/6W
R13 RK73EB2E102J CHIP R 1.0K J 1/4W
R14 RD14BB2C561J RD 560 J 1/6W
R15 RK73EB2E103J CHIP R 10K J 1/4W
R16 RK73GB2A223J CHIP R 22K J 1/10W
R17 RK73GB2A473J CHIP R 47K J 1/10W
R19 RK73EB2E103J CHIP R 10K J 1/4W
R20 RK73GB2A104J CHIP R 100K J 1/10W
R33 RD14BB2C472J RD 4.7K J 1/6W
R37 RD14BB2C472J RD 4.7K J 1/6W
R38 RD14DB2H102J SMALL-RD 1.0K J 1/2W
R39 RK73GB2A223J CHIP R 22K J 1/10W
R40 RD14DB2H102J SMALL-RD 1.0K J 1/2W
R41, 42 RK73GB2A123J CHIP R 12K J 1/10W
R43 RK73GB2A562J CHIP R 5.6K J 1/10W
R44 RK73GB2A223J CHIP R 22K J 1/10W
R45 RD14DB2H332J SMALL-RD 3.3K J 1/2W
R46 RD14BB2C473J RD 47K J 1/6W
R47 RK73GB2A183J CHIP R 18K J 1/10W
R48 RK73GB2A104J CHIP R 100K J 1/10W
R49 RK73GB2A103J CHIP R 10K J 1/10W
R50 RK73GB2A102J CHIP R 1.0K J 1/10W
R52 RK73GB2A104J CHIP R 100K J 1/10W
R54 RK73GB2A104J CHIP R 100K J 1/10W
R56 RK73GB2A104J CHIP R 100K J 1/10W
R60 RK73GB2A104J CHIP R 100K J 1/10W
R62 RK73GB2A104J CHIP R 100K J 1/10W
R66 RK73GB2A104J CHIP R 100K J 1/10W
R67 RK73GB2A103J CHIP R 10K J 1/10W
R68 ✽RK73GB2A221J CHIP R 220 J 1/10W
R69 RK73GB2A222J CHIP R 2.2K J 1/10W
R72 RK73GB2A102J CHIP R 1.0K J 1/10W
R73, 74 RK73GB2A222J CHIP R 2.2K J 1/10W
R75 RK73GB2A102J CHIP R 1.0K J 1/10W
R76 RK73GB2A104J CHIP R 100K J 1/10W
R77 RK73GB2A222J CHIP R 2.2K J 1/10W
R79 RK73GB2A222J CHIP R 2.2K J 1/10W
R82 RK73GB2A102J CHIP R 1.0K J 1/10W
R83, 84 RK73GB2A471J CHIP R 470 J 1/10W
R85 RK73GB2A222J CHIP R 2.2K J 1/10W
R88 RK73GB2A104J CHIP R 100K J 1/10W
R89 RK73GB2A102J CHIP R 1.0K J 1/10W
R90 RK73GB2A104J CHIP R 100K J 1/10W
R93 RK73GB2A104J CHIP R 100K J 1/10W
R96 RK73GB2A104J CHIP R 100K J 1/10W
R97, 98 RK73GB2A102J CHIP R 1.0K J 1/10W
R100 RK73GB2A102J CHIP R 1.0K J 1/10W
R101 ✽RK73GB2A105J CHIP R 1.0M J 1/10W
R102 RK73GB2A102J CHIP R 1.0K J 1/10W
R103 RK73GB2A471J CHIP R 470 J 1/10W
R104 RK73GB2A472J CHIP R 4.7K J 1/10W
R105 RK73GB2A471J CHIP R 470 J 1/10W
!

25
KDC-V7521/Y
ELECTRIC CIRCUIT UNIT (X25-XXX2-7X)
✽New parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
PARTS LIST
!
Indicates safety critical components.
E: KDC-V7521 E1: KDC-V7521Y
R106 RK73GB2A472J CHIP R 4.7K J 1/10W
R107 RK73GB2A225J CHIP R 2.2M J 1/10W
R108 RK73GB2A222J CHIP R 2.2K J 1/10W
R109 RK73GB2A102J CHIP R 1.0K J 1/10W
R110 RK73GB2A103J CHIP R 10K J 1/10W
R111 RK73GB2A102J CHIP R 1.0K J 1/10W
R112 RK73GB2A103J CHIP R 10K J 1/10W
R113 RK73GB2A473J CHIP R 47K J 1/10W
R114 RK73GB2A103J CHIP R 10K J 1/10W
R115 RK73GB2A104J CHIP R 100K J 1/10W
R116 RK73GB2A222J CHIP R 2.2K J 1/10W
R117, 118 RK73GB2A102J CHIP R 1.0K J 1/10W
R119 RK73GB2A471J CHIP R 470 J 1/10W
R130, 131 RK73EB2E472J CHIP R 4.7K J 1/4W
R132-134 RK73EB2E101J CHIP R 100 J 1/4W
R135-137 RK73EB2E472J CHIP R 4.7K J 1/4W
R150 RK73GB2A472J CHIP R 4.7K J 1/10W
R151 RK73GB2A103J CHIP R 10K J 1/10W
R152 RK73GB2A472J CHIP R 4.7K J 1/10W
R155, 156 RK73EB2E100J CHIP R 10 J 1/4W
R157 RK73EB2E4R7J CHIP R 4.7 J 1/4W
R158 RK73GB2A102J CHIP R 1.0K J 1/10W
R159 RK73GB2A472J CHIP R 4.7K J 1/10W
R161-164 RK73FB2B361J CHIP R 360 J 1/8W
R165-168 RK73GB2A223J CHIP R 22K J 1/10W
R169-172 ✽RK73EB2E181J CHIP R 180 J 1/4W
R200 RK73GB2A101J CHIP R 100 J 1/10W
R201 RK73GB2A103J CHIP R 10K J 1/10W
R202 RK73GB2A822J CHIP R 8.2K J 1/10W
R203 RK73GB2A473J CHIP R 47K J 1/10W
R204 ✽RK73GB2A152J CHIP R 1.5K J 1/10W
R205-208 RK73GB2A223J CHIP R 22K J 1/10W
R210 RD14BB2C102J RD 1.0K J 1/6W
R211 RK73GB2A223J CHIP R 22K J 1/10W
R212 RD14BB2C102J RD 1.0K J 1/6W
R213 RK73GB2A223J CHIP R 22K J 1/10W
R214-216 RK73GB2A222J CHIP R 2.2K J 1/10W
R217 RK73GB2A102J CHIP R 1.0K J 1/10W
R218 RK73GB2A472J CHIP R 4.7K J 1/10W
R220, 221 RK73GB2A104J CHIP R 100K J 1/10W
R222-224 RK73GB2A222J CHIP R 2.2K J 1/10W
R230 RK73GB2A472J CHIP R 4.7K J 1/10W
R231 RK73GB2A473J CHIP R 47K J 1/10W
R233 RK73EB2E471J CHIP R 470 J 1/4W
R234 RK73EB2E102J CHIP R 1.0K J 1/4W
R235 RK73EB2E472J CHIP R 4.7K J 1/4W
R236 RK73EB2E471J CHIP R 470 J 1/4W
R237 RK73EB2E102J CHIP R 1.0K J 1/4W
R238, 239 RK73EB2E471J CHIP R 470 J 1/4W
R240 RK73EB2E102J CHIP R 1.0K J 1/4W
R243 RK73GB2A473J CHIP R 47K J 1/10W
D1 S2V20✽A DIODE
D2 1GWJ43 DIODE
D3 MA4056 (N)-M ZENER DIODE
Ref. No. A d
d
N
e
wParts No. Description Desti-
nation Ref. No. A
d
d
N
e
wParts No. Description Desti-
nation
D4 HZS9A2L ZENER DIODE
D4 MA4082 (N)-L ZENER DIODE
D5 MA4110-L ZENER DIODE
D7 MA4056-M ZENER DIODE
D8 HZS5B1 ZENER DIODE
D8 MA4047-M ZENER DIODE
D11, 12 AM01Z DIODE
D11, 12 DSM1SD2 DIODE
D11, 12 ERA15-01 DIODE E
D11, 12 ERA15-02 DIODE
D14 AM01Z DIODE
D14 DSM1SD2 DIODE
D14 ERA15-01 DIODE E
D14 ERA15-02 DIODE
D15 1SS133 DIODE
D16 MA4056 (N)-M ZENER DIODE
D17 HZS6C2L ZENER DIODE
D17 MA4062 (N)-M ZENER DIODE
D18 1SS133 DIODE
D22-24 HZS6C1 ZENER DIODE
D22-24 MA4062-L ZENER DIODE
D25, 26 RD6.8M (B2) ZENER DIODE
D27, 28 MA4068 (N)-M ZENER DIODE
D29 HZS6C1 ZENER DIODE
D29 MA4062-L ZENER DIODE
D30-32 1SS133 DIODE
D33-36 AM01Z DIODE
D33-36 DSM1SD2 DIODE
D33-36 ERA15-01 DIODE E
D33-36 ERA15-02 DIODE
D38-41 AM01Z DIODE
D38-41 DSM1SD2 DIODE
D38-41 ERA15-01 DIODE E
D38-41 ERA15-02 DIODE
D60 IMSA-6801 SURGE ABSORBER
D60 SA-C2102-101TB SURGE ABSORBER E
D61-64 1SS133 DIODE
IC1 ✽UPD703033GC139 MI-COM IC
IC2 TDA7407D ANALOGUE IC
IC3 M5237ML IC(VOLTAGE REGULATOR)
IC4 2B TA8273H ANALOGUE IC
IC8 HD74HC02FP MOS-IC
IC8 TC74HC02AF MOS-IC
IC8 74VHC02SJ MOS-IC E
IC14 TDA7479D ANALOGUE IC
IC15 LB1930M ANALOGUE IC
IC16 S-80837ANNP MOS-IC
Q1 2SB1548 (P) TRANSISTOR
Q2 2SC4081 TRANSISTOR
Q2 2SD1819A TRANSISTOR
Q3 2SA1576A TRANSISTOR
Q3 2SB1218A TRANSISTOR
Q4 2SB1548 (P) TRANSISTOR
Q5 DTC144EUA DIGITAL TRANSISTOR
Q5 UN5213 DIGITAL TRANSISTOR