Kenwood KDC-HD942U User manual

SERVICE MANUAL
This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
© 2009-3 PRINTED IN JAPAN
B53-0719-00 (N)166
KDC-HD942U
CD RECEIVER
TDF SPARE-PANEL
MAIN UNIT NAME TDF PARTS No. TDF NAME
KDC-HD942U Y33-3110-11 TDF-HD99D
Panel assy
(A64-4777-01)
Mounting hardware assy
(J22-0789-03)
Compact disc
(W01-1723-15)
Remote controller assy (RC-547)
(A70-2085-15)
Battery
(Not supplied)
Escutcheon
(B07-3235-03)
Lever
(D10-7049-04) x2
Screw set
(N99-1757-15)
DC cord
(E30-6428-05)
Carrying case
(W01-1710-05)
Screw set
(N99-1730-35)

2
KDC-HD942U
BLOCK DIAGRAM
BU1.5V
BU3.3V
SW3.3V
DPU1
CD PLAYER UNIT (X32-6260-00)
BOARD
MOTHER
(X34- )
EF
A
C
B
TR COIL
FO COIL
APC
IC2
16.934MHz
CLOCK
IC3
LOADING &
MOTOR
DRIVER
MOTOR
SPINDLE
S2
S1
S3
SLED
MOTOR
DM1
DM2
X3
Q7
RF AMP
SERVO
MP3 DECODER
WMA DECODER
1Mbit SRAM
PROCESSOR
AAC DECODER
+
+
+
+
+
LEVEL
SHIFT
IC5
iPod
IC7
REG
BU3.3 /
AUTHENTICATION
LEVEL
IC6
SHIFT
IC1
u-COM
Q5
SW BU1.5V
IC9
SW3.3V
REG
Q3
SW
CLOCK
9.000MHz
X1
32.768kHz
CLOCK
X2
IC4
INV
Q9
MECHANISM
VREF
12EJE SW
LOS SW
LOE SW
MOTOR
LO/EJ
AGND
TRO
FOO
DMO
FMO
LD
SIGNAL A/B/C/E/F
S.GND
S7.5V
FOO
TRO
DMO
FMO CD DRIVE MUTE
SO
SRAMSTB
SI
BUCK
CCE
CD REQ
MSTOP
BUCK
CCE
REQ
SO
SI
RST
MRST
Lch
Rch
Z DET
MUTE L/R
DGND
DVSS BU1.5V SW1.5V D3.3V
BU5V
PD
VBUS SW
USB+
VBUS OC
USB-
DATA SCD SI
REQ A
MRST
MSTOP
CLK
CD MUTE
REQ M
DATA M
USB D+
USB D-
USB VBUS SW
USB OC
CD LOE LIM SW RVIN1/RVIN2 DVCC3B PON DVSS DVCC3A PWE
CD SO
DSP REQ
CD CLK
CD RST
ZDET IN
CD SRAMSTB
CE
BSIF LRCK
BSIF DATA
BSIF BCK
BSIF GATE
BSIF ST REQ
IPOD SDA
IPOD SCL
AVSS A3.3V LO RO
BSIF ST REQ
BSIF GATE
BSIF DATA
BSIF BCK
BSIF LRCK
G
D
S
FM/AM
CD
MUTE A
MUTE 0,1,2
WININ OFFSET
MUTE A
PW-IC MUTE
DC ERR
MUTE 0,1,2
AUX
CH
STBY
PRE M/SW M
I2C
I2C
V.BUS OC
RST
RST
P.ON ILLUMI
P.ON
P.ON
F. SEL
P.ONSW V.BUS
P.ON PA
L-DICE
SINGLE
DIRANA2
256k-BIT
iTunes TAGGING
FAVORITE
INSTALLER
BACK-UP
I2C
V.BUS OC
USB I/F
SW V.BUS
CORRECTION
ROM
FRONT-END A8V
DSP
E-VOL
PRE OUT
AUX IN
IC451
BU
u-COM
P-CON
ANT-CON
ACC DET
ILLUMI
BU5V
ILLUMI+B
A8V
P. CON
ANT CON
ILLUMI
ACC
BACK UP
LINE MUTE
SP OUT
(FL/FR/RL/RR)
LCD with DRIVERLED
BU5V
A8V
ILLUMI+B
ILLUMI+B
(F/R/SW)
WIRED REMOTE
LINE MUTE
USB5V
to USB u-COM
USB I/F
BU
USB
PAN5V
IC1
IC602
IC500
SERVO+B
PAN5V
SW
(D5V)
DC/DCHI-SIDE
SW
USB5V
DET
BU/SURGE
SW
SRC
KEY MATRIX
KEY
ROM
CORRECTION
LED SW
LCD+B
u-COM
PANEL
LEVEL
SHIFT
AUTHENTICATION
iPod
SYSTEM
BU3.3V
BU5V Q121,122
Q141-144
Q151
D151
Q123
CN201
Q401-406
J421
J401
J1
Q407,408
J431
4V PRE+B
Q350-353
VP
Q41-44
Q31-34
Q21,22
IC11
WH151
LX BUS
P.ON5V
(HD3.3V)
DC/DC
PAN5V
HD3.3V
IC101
HD1.8VHD1.8V
HD1.2VHD1.2V
IC102
RF5VRF5V
IC75
A8V
A5V
A5V
IC10
A8V
DSP 5V
Q145,146
IC61IC211
Q682,683
IC71
SERVO+B
ENCODER
ROTARY
CONTROL
REMOTE
IC3
S1
D3.2V
IC7
IC4
ED1
S6
S1
EJECT
SWSW
RESET
S2
(to X16- )
IC600
PAN5V
A5V IC371
A1
TUN3.3V
TUN1.8V
HD1.2V
E2PROM
IC852
BU3.3V
IC601
E2PROM
P.ON5V
IC851
HD u-COM
PROCESSOR
HD RADIO
SD-RAM
ROM
FLASH
IC1
IC15
IC2
HD3.3V
IC2
SERVO
DSP
MOTOR
DRIVER
etc
MECHA
u-COM
IC1
SERVO+B
BU5V
SW
IC7
Q5
IC5,6
E2PROM
IC4
IC8
BU3.3V
FLIP DET
(to X15- )
RESET
IC
POWER
IC
MUTE
PRE
MUTE
DRIVER
CONNECTOR
4P
BU5V
IC604
RF5V
SWITCH UNIT (X16- )
(X34- )
DISPLAY UNIT (X15- )
PROCESSOR UNIT
(X17- )
(X32- )
CD PLAYER UNIT

3
KDC-HD942U
●ELECTRIC UNIT (X34-6320-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC10 A5V REG Power supply for A5V to DSP.
IC11 AUD8V REF Power Supply Outputs 1.27V.
IC61 D5V & P.ON5V SW REG Power supply for D5V to USB/PANEL and P.ON5V.
IC71 HD3.3V SW REG Power supply for HD3.3V to the front-end and X17.
IC74 BU3.3V REG Power supply for BU3.3V to system μ-com and E2PROM.
IC75 RF5V REG Power supply for RF5V to the front-end.
IC101 HD1.8V REG Power supply for HD1.8V to the front-end.
IC102 HD1.2V REG Power supply for HD1.2V to X17.
IC211 Hi-side SW Detects USB over-current and ON/OFF SW.
IC371 DSP Digital signal processor.
IC451 E-VOL & Source Selecter Controls the sources and volume.
IC500 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC600 Reset IC Outputs Lo (system μ-com is reset) when detection voltage goes below 3.6V.
IC601 E2PROM For the favorite memory, installer memory, back-up memory and ROM collection.
IC602 System μ-COM Controls FM/AM tuner, the changer, CD mechanism, panel, volume and DSP.
IC604 Muting Logic Controls muting logic.
IC851 HD μ-COM Control μ-com for the front-end and HD module.
IC852 E2PROM For iTunes Tagging data.
Q11-13 AUD8V AVR When Q13's base goes ON, A8V AVR outputs 8.0V.
Q21,22 BU5V AVR While back-up is applied, BU5V AVR outputs +5V.
Q31-34 Servo+B When Q34's base goes ON, Servo+B outputs 7.5V.
Q41-44 ILLUMI+B When Q44's base goes ON, AVR outputs 10.5V.
Q61 FREQ CONT SW Changes frequency of IC61. (SW REG)
Q72 FREQ CONT SW Changes frequency of IC71. (SW REG)
Q121 BU DET SW When the base gose Hi, back-up voltage is detected.
Q122 Surge DET SW When the base goes Hi, surge voltage is detected.
Q123 ACC DET SW When the base gose Hi, ACC voltage is detected.
Q141,144 P.CON SW When Q144’s base goes Hi, AVR outputs 14V.
Q142,143 P.CON Protect Protects Q143 by turning on when P.CON output is grounded.
Q145,146 Power ANT SW When Q146’s base goes Hi, power antenna switch outputs 14V.
Q151 Small-lamp DET SW When the base goes Hi, small-lamp is detected.
Q350-353 4V PRE+B When Q353’s base goes ON, 4V_PRE+B is output (up to 12V).
Q401-406 Pre-out Mute SW When a base gose Hi, pre-out is set to mute.
Q407,408 Pre-out Mute Driver When a base gose Lo, mute driver is turned on.
Q451 DC Offset Error DET Canceller Circuit turns off when one or more audio terminals of IC451 have voltage below 1.0V.
Q681 X15's LED SW When DSI port is Lo, X15’s LED is ON.
Q682,683 Panel+5V SW When Q682’s base gose Hi, Panel+5V is output.
Q766 HD Radio Mute SW When the base gose Hi, HD radio mute is ON.
Q768 HD Radio Reset SW When the base gose Hi, HD radio reset is ON.
●SWITCH UNIT (X16-6520-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Panel μ-COM LCD, encoder key and LED SW (ON/OFF) are controlled by IC1.
IC3 Remote Control IC Remote control signal receiver.
COMPONENTS DESCRIPTION

4
KDC-HD942U
Ref. No. Application / Function Operation / Condition / Compatibility
IC7 3.2V REG Power supply for 3.2V.
Q1 LED Driver Being controlled by IC1.
Q8 Rotary (R) LED Driver Being controlled by IC1.
Q9 Rotary (L) LED Driver Being controlled by IC1.
Q41 LCD Back Light LED Driver Being controlled by IC1.
●PROCESSOR UNIT (X17-2050-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 HD Radio Processor HD Radio data decorder.
IC2 SD RAM For buffering program and data.
IC151 Flash ROM For firmware installing.
Q101 Reset Inverter When the base goes Hi, reset of IC101 is ON.
●CD PLAYER UNIT (X32-6260-00)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Mechanism μ-COM Controls DSP and peripheral circuit.
USB host controller. (Compliant with Universal Serial Bus Specification Rev2.0)
IC2 Servo DSP with Built-in Audio DAC Built-in MP3·WMA·AAC decoder.
Built-in 1M-bit-SRAM.
IC3 4ch BTL Driver Driver for focusing & tracking coil, driver for sled & spindle motor, and operation for disc
loading & ejection.
IC4 iPod Authentication Connection authentication for iPod.
MFI341S2162: iPhone-compliant.
IC5 3.3V→5.0V Level Shift Converts communication signal from 3.3V to 5.0V.
IC6 5.0V→3.3V Level Shift Converts communication signal from 5.0V to 3.3V.
IC7 BU1.5V / BU3.3V Regulator Power supply for digital back-up.
Power supply for mechanism μ-COM.
IC8 E2PROM Memory for ROM correction.
Countermeasure for software malfunction.
IC9 A3.3V Regulator Power supply for digital, analog and audio line.
Q3 D1.5V Output The output voltage in which the power supply that diverges from the BU1.5V line is turned
on and off is used as D1.5V.
Q5 B.3.3V Output The output voltage in which the power supply that diverges from the BU3.3V line is turned
on and off is used as D3.3V.
Q6 Control signal Inverter Controls Q5.
Q7 APC (Auto Power Control) Laser diode driver.
Q9 Control signal Inverter Because the detection logic of LOE/LIM_SW is different in the mechanism μ-COM and the
system μ-COM, the logic to the mechanism μ-COM side is reversed.
D1 Laser Diode Protection Prevents reverse bias which is applied to laser.
Laser destruction prevention.
D2,3 Countermeasure against Static
Electricity
The potential difference between DGND and AGND is absorbed, and the malfunction by
static electricity is prevented.
COMPONENTS DESCRIPTION

5
KDC-HD942U
●System μ-COM: IC602 on X34- (ELECTRIC UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1 WIRED REMO I Remote control signal input Pulse width detection
2 NC - Not used Output L fixed
3 CD SYS DATA O Data from system μ-com to Bolero
4 CD CD DATA I Data from Bolero to system μ-com
5 CD CD CLK I Clock from Bolero
6 BYTE -
7 CVVSS -
8 XCIN - Resonator 32.768kHz
9 XCOUT - Resonator 32.768kHz
10 RESET -
11 XOUT - Resonator 12MHz
12 VSS -
13 XIN - Resonator 12MHz
14 VCC1 -
15 NMI - Not used
16 NC - Not used Output L fixed
17 FLIP DET I Panel-opened detection for flip-down panel H: Opened, L: Closed
18 BU DET I Back-up detection BU found: L, No BU or momentary power-
down or over-voltage: H
19 NC - Not used Output L fixed
20 PAN RST O Panel reset H: Normal, L: Reset
21 SRC KEY I Source key input H: OFF, L: ON
22 PANEL DET I Panel connector detached/attached detection L: Panel detached, H: Panel attached
23 EJECT KEY I Eject key input H: OFF, L: ON
24 NC (SYNC) - Not used Output L fixed
25 DSI (EJECT ILL) I/O DSI control L: Turned ON, Hi-Z: Turned OFF
26 PWIC BEEP O Beep output 2kHz / 1kHz
27 HR I2C SCL O I2C communication MAX 400kHz
28 HR I2C SDA O I2C communication MAX 400kHz
29 PAN SYS DATA O Data from system μ-com to panel UART MAX 500kHz
30 PAN PAN DATA I Data from panel to system μ-com UART MAX 500kHz
31 PAN SYS REQ O Communication request from system μ-com to panel
32 PAN PAN REQ I Communication request from panel to system μ-com
33,34 NC - Not used Output L fixed
35 HD RST O HD μ-com reset L: Normal, H: HD reset
36 CD DISC12 SW I 12cm disc detection L: 12cm disc
37 CD LOS SW I CD loading detection L: Eject completed
38 M STOP O Mechanism stop H: Normal, L: SOC stopped
39 ROM COR DET I ROM correction writing request H: ROM correction rewritable (I2C opened)
39 ROM COR EPM I Becomes EPM input when ROM collection is written Rewritable in Lo at the start-up
40 CD MUTE I Mechanism mute request L: Mute request, H: Normal
41 CD CD REQ I Communication request from mechanism to system
μ-com
42 M RST O Mechanism reset H: Normal, L: Reset
MICROCOMPUTER’S TERMINAL DESCRIPTION

6
KDC-HD942U
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
43 CD LOE LIM SW I CD detection (chucking detection) H: Loading completed, L: No disc
44 PAN SC CON O Panel operation control
(Becomes CE when system μ-com is rewritten) H: Normal, L: Panel operation stopped
45 CD SYS REQ O Communication request from system μ-com to
mechanism
46 CD LOEJ I/O CD motor control qRefer to the truth value table
47 CD MOTOR O CD motor control qRefer to the truth value table
48 P.ON PANEL I/O Power supply for panel μ-com
(Necessary to certificate panel)
H: ON, Hi-Z: OFF (Panel detached, Panel
opened, POWER OFF)
49 P.ON ILL I/O Panel LED power supply control H: ON, Hi-Z: OFF (Panel detached, Panel
opened, POWER OFF)
50 NC - Not used Output L fixed
51 F.SEL I/O SW-REG frequency setting
Hi-Z: 530kHz-1100kHz in AM source,
H: All sources except AM
H: 1110kHz-1700kHz in AM source
52 P.ON I/O Power supply control H: ON, Hi-Z: OFF
53-55 NC - Not used Output L fixed
56 P.CON I/O P.CON control POWER ON: H, POWER OFF: Hi-Z,
STANDBY source: Hi-Z
57 ANT CON I/O ANT control TUNER source: H, Other sources: Hi-Z
58 ACC DET I ACC detection ACC found: L, No ACC: H
59 ILLUMI DET I Dimmer illumination detection L: ON, H: OFF
60 VCC2 -
61 NC (P.ON D5V) - Not used Output L fixed
62 VSS -
63 LINE MUTE I Line mute detection TEL mute: Below 1V, NAVI mute: Over 2.5V
64 DSP PDN O DSP reset H: Normal, L: Reset
65 P.ON 4VPRE O 4V-PRE power supply control H: ON, Hi-Z: OFF
66 MUTE 0 O E-VOL front mute control L: Mute ON, Time constant isolation set-
ting: 10ms, H: Normal
67 MUTE 1 O E-VOL rear mute control L: Mute ON, Time constant isolation set-
ting: 10ms, H: Normal
68 MUTE 2 O IC-2 SW mute control L: Mute ON, Time constant isolation set-
ting: 10ms, H: Normal
69 PWIC DC DET I DC offset detection
70 MUTE AFS I/O IC-2 mute AFS control L: Mute ON, Time constant isolation set-
ting: 0.5ms, Hi-Z: Normal
71 EVOL SDA I/O Data from system μ-com to E-VOL
71 E2P SDA I/O I2C data for mother E2PROM
71 DSP SDA I/O I2C data for DSP
72 EVOL SCL I/O Clock from system μ-com to E-VOL
72 E2P SCL I/O I2C clock for mother E2PROM
72 DSP SCL I/O I2C clock for DSP
73 LX REQ S I Communication request from slave unit
74 PWIC MUTE O Power IC mute STANDBY source or momentary power-
down: L, TEL mute: L
MICROCOMPUTER’S TERMINAL DESCRIPTION

7
KDC-HD942U
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
75 PWIC STBY O Power IC standby POWER ON: H, POWER OFF: L
76 LX REQ M O Communication request to slave unit
77 LX MUTE I Mute request from slave unit H: Mute ON, L: Mute OFF
78 LX CON O Start-up request to slave unit H: Slave unit ON, L: Slave unit OFF
79 LX RST O Forced reset to slave unit H: Reset, L: Normal
80 MUTE PRE O External preout mute 0-bit or momentary power-down: L,
L: Mute ON
81 MUTE PRE SW O External preout mute sub 0-bit or momentary power-down: L,
L: Mute ON
82-86 NC - Not used Output L fixed
87 HR P.CON O P.CON control for HD μ-com H: ON (same timing as LX-P.CON)
88 HR MUTE I Mute request from HD μ-com H: Mute cancelled, L: Mute
89 HR BU DET O Back-up detection for HD μ-com L: Back-up found (L fixed)
90-93 NC - Not used Output L fixed
94 AVSS -
95 NC - Not used Output L fixed
96 VREF -
97 AVCC -
98 LX DATA S I Data from slave unit
99 LX DATA M O Data to slave unit
100 LX CLK I/O LX-BUS clock
Truth value table
qCD motor control
CD MOTOR (Pin 47) CD LOEJ (Pin 46)
Standby L L
Eject H H
Load H L
Brake H Hi-z
MICROCOMPUTER’S TERMINAL DESCRIPTION
●HD μ-COM: IC851 on X34- (ELECTRIC UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1 IBOC BLEND I IBOC BLEND signal input L: Analog, H: Digital
2,3 NC - Not used Output L fixed
4 TOOL 1 O Debug Output L fixed
5 TOOL 0 I/O Debug Output L fixed
6 RESET I Reset L: Reset
7,8 NC - Not used General-purpose input setting
9 FLMD 0 I Debug Built-in pull-down

8
KDC-HD942U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
10 X2 I 20MHz External oscillation setting
11 X1 O 20MHz External oscillation setting
12 REGC - Built-in regulator stabilization
13 VSS - VSS
14 EVSS - EVSS
15 VDD - VDD 3.3V
16 EVDD - EVDD 3.3V
17 I2C SCL I System μ-com communication Clock input from system μ-com
18 I2C SDA I/O System μ-com communication Data input/output with system μ-com
19-32 NC - Not used Output L fixed
33 BU DET I Back-up detection input Not used
34 P.CON I Power control (Stop) input Rising edge: ON, L: OFF (Same timing as LX-BUS)
35 PROTOCOL SEL I Communication protocol selection L: KAB (Kenwood Advanced Bus), H: LX-BUS
36 PHY SEL I Physical layer selection L: Head unit (Over I2C)
H: Black box (Protocol compliant)
37 RESERVED 0 O Destination (Spare) Output L fixed
38 RESERVED 1 O Destination (Spare) Output L fixed
39 MUTE I/O Mute output (Head unit) Hi-Z: Mute cancelled, H: Mute
40,41 NC - Not used Output L fixed
42 TERMINAL RX I External terminal
43 TERMINAL TX O External terminal
44-46 NC - Not used Output L fixed
47 AVREF -
48 AVSS -
49 DIRANA INT END I Initial-end input from Dirana Hi when initial-end is output
50 DIRANA RESET O Reset output to Dirana L: Reset
51,52 NC - Not used Output L fixed
53 HD P.ON I/O HD (Cayman) P.ON
Switching power supply 3.3V ON/OFF H: 3.3V ON, Hi-Z: 3.3V OFF
54 CAYMAN RESET O Reset output to HD (Cayman) H: Reset
Hi is output after P.CON becomes Hi
55,56 NC - Not used Output L fixed
57 TUNER P.ON O Tuner (L-Dice) P.ON, AF5V ON/OFF H: RF5V ON, L: RF5V OFF
58 I2C SCL I/O Dirana, Cayman, E2PROM communication I2C clock
59 I2C SDA I/O Dirana, Cayman, E2PROM communication I2C data input/output
60 NC - Not used Output L fixed
61 3.3V F.SEL 0 I/O 3.3V REG frequency selection
H: 530kHz-1100kHz or 1610kHz-1700kHz in AM
Hi-Z: All sources except AM
Hi-Z: 1110kHz-1600kHz in AM
62 3.3V P.ON O Power supply 3.3V control
HD pack & module 3.3V/1.8V/1.2V control H: 3.3V ON, L: 3.3V OFF
63 CHECKER 1 O Chip select start-up check H: ON, L: OFF
64 CHECKER 0 O Chip select start-up check H: ON, L: OFF

9
KDC-HD942U
MICROCOMPUTER’S TERMINAL DESCRIPTION
●Panel μ-COM: IC1 on X16- (SWITCH UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1 REMO I Remote control signal input Pulse width detection
2-5 NC - Not used Output L fixed
6 BYTE - GND Connects to GND
7 CNVSS -
8 LED CONT LEFT BLUE O Blue key (left side) output Not used
9 LED CONT LEFT RED O Red key (left side) output Not used
10 RESET - Reset H: Normal, L: Reset
11 XOUT - Resonator 12MHz
12 VSS - GND Connects to GND
13 XIN - Resonator 12MHz
14 VCC1 - Power supply (5V) Connects to PAN5V
15 NMI - Not used Input fixed
16 LED CONT LEFT GREEN O Green key (left side) output Not used
17 LED CONT RIGHT BLUE O Blue key (right side) output Not used
18 LED CONT RIGHT RED O Red key (right side) output Not used
19 LED CONT RIGHT GREEN O Green key (right side) output Not used
20 LED CONT TRI RED O Triangle-red turning-on SW PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
21 LED CONT TRI GREEN O Triangle-green turning-on SW Not used
22 LED CONT LCD O LCD back-light PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 23kHz
23 NC - Not used Output L fixed
24 LED CONT RTY2 O LED rotary (MULTI-key side) PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
25 NC - Not used Output L fixed
26 LED CONT RTY1 O LED rotary (VOL-key side) PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
27,28 NC - Not used Output L fixed
29 PAN DATA O Data transmission from panel
30 SYS DATA I Data reception from system μ-com
31 SYS REQ I System μ-com communication request input H: Data communication
32 PAN REQ O Panel communication request output H: Data communication
33 LCD SDA O LCD data Outputs LCD SDA
34 NC - Not used Output L fixed
35 LCD SCK O LCD clock Outputs LCD SCK
36 LCD RST O LCD reset Normal: H, Reset: L
37 LCD CD O LCD CD L: Control data, H: Display data
38 LCD CS O LCD CS Outputs LCD CS
39 ROM COR DET I ROM correction writing mode H: ROM correction rewritable
(I2C opened)
40-43 NC - Not used Output L fixed
44 FLASH CE I Chip enable for flash ROM rewriting
45-50 NC - Not used Output L fixed

10
KDC-HD942U
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
51 ROM COR SDA I/O Data transmission and reception for ROM cor-
rection Always output except in reading
52 ROM COR SCL I/O Clock for ROM correction Always output except in reading
53-55 NC - Not used Output L fixed
56 ROTALY2 CW I Rotary (MULTI-key) B input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
57 ROTALY2 CCW I Rotary (MULTI-key) A input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
58 ROTALY1 CW I Rotary (VOL-key) B input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
59 ROTALY1 CCW I Rotary (VOL-key) A input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
60 VCC2 - Power supply (5V) Connects to PAN5V
61 NC - Not used Output L fixed
62 VSS - GND Connects to GND
63-70 NC - Not used Output L fixed
71 SC CON I System μ-com communication
Panel operation control
H: Panel operation,
L: Panel operation stopped
72 NC - Not used Output L fixed
73 KR2 I Key return input qRefer to the truth value table
74 KR1 I Key return input qRefer to the truth value table
75 NC - Not used Output L fixed
76-80 KS1-KS5 I/O Key scan qRefer to the truth value table
81 TYPE I Destination port H: Variable (RGB), L: Unicolor (blue)
82-93 NC - Not used Output L fixed
94 AVSS - GND Connects to GND
95 NC - Not used Output L fixed
96 VREF - A/D analog reference voltage Connects to PAN5V
97 AVCC - Power supply (5V) Connects to PAN5V
98-100 NC - Not used Output L fixed
Truth value table
qKey matrix
KR1 (Pin 74) KR2 (Pin 73)
KS1 (Pin 76) TI AM
KS2 (Pin 77) FNC <<
KS3 (Pin 78) PLAY
KS4 (Pin 79) SEARCH >>
KS5 (Pin 80) AUDIO FM
MICROCOMPUTER’S TERMINAL DESCRIPTION

11
KDC-HD942U
●How to enter the test mode
Press and hold the [FNC] and [AUD] keys and reset. (While
“– – – –” is being displayed, power can be ON for 30 min-
utes.)
∗Reset can be done by power activation because the re-
set button is placed on the sub panel.
●How to clear the test mode
Reset, momentary power down, ACC OFF, POWER OFF,
detach the panel.
●Test mode default condition
· Source is STANDBY
· Display lights are all turned on.
· The volume is at “30” (-10dB).
· CRSC is off regardless of the availability of switching
function
· BEEP should always function when the key is pressed
briefly.
· AUX is ON
· DSP shall be BYPASS setting (not passing DSP).
· DISPLAY TYPE is TYPE A, Status is OFF, and SIDE is
Display Tag.
· Indication of HD source shall be as below.
1st row = Freq, 2nd row = Call Letter, 3rd row = Song
· TUNER source indication: 1st row = Frequency
· CD/USB source indication: 1st row = P-TIME
· At all sources: 4th row=date, 5th row = Spectrum ana-
lyzer/Clock
· SOURCE SELECT shall be “2” (A mode switched by
pressing [SRC] key briefly).
●HD source test mode
(∗1) Display [1] key, [2] key, and [3] key on the multi-function
during the test mode only.
1. Press the [FNC] key briefly to make the multi-function
display.
2. Rotate the control knob on the right side and use the
[FM] or [AM] key to display the target key in the center.
3. Press the [ ] key briefly to finalize the display.
(∗2) Perform the same operations as above on the keys, [1],
[2], and [3] on the remote controller.
●HD display item switching
Switch the display item for the “Song” line every time the [1]
key is pressed in HD-FM band.
(Adjusted result status (displayed, but unused), Frequency
and HD reception status, S-meter, IF Counter, Multiplex
Noise, IF Bandwidth, Adjacent Noise, Call Letter, QI, S/N,
Ballgame, Digital Audio Gain)
●Each version display (HD μ-com/Cayman/
DiRaNa) switching
Display version on the “Song” line with the preset call
[53] (key code 0x3C:ebu3). Display HD μ-com→Cayman
(shortened)→Cayman (full) by every input.
∗[5] key on the remote controller is operable because [5]
key is not displayed on the multi-function in the head
unit.
TEST MODE
AUTO VOL/AUD SEARCH FNC AM
FMSRC

12
KDC-HD942U
●Specification of the test mode for tuner source
The frequency of 98.3MHz is received when the [4] key is
pressed in the TUNER FM band.
(∗1) Only in the test mode, [1] key, [2] key, [3] key, [4] key,
[5] key and [6] key (K3I) shall be displayed on the multi-
function key.
1. Press the [FNC] key briefly to make the multi-function
display.
2. Rotate the control knob on the right side and use the
[FM] or [AM] key to display the target key in the center.
3. Press the [ ] key briefly to finalize the display.
(∗2) Perform the same operations as above on the keys, [1],
[2], [3], [4], [5], and [6] of the remote controller.
●TUNER Setup adjustment mode specification
1. Use [FM] or [AM] key to select TUNER band.
2. Press and hold [ ] key for 2 seconds to enter TUNER
adjustment mode. At this point, set FM reception fre-
quency to 98.3MHz at the same time.
3. Use [FM] or [AM] key to change between the adjustment
items.
Soft Mute adjustment
[FM] key[FM] key [AM] key
[AM] key
[FM] key
Seek Stop Leve
adjustment
(manual)
Seek Stop Leve
adjustment
(auto)
[AM] key
(Note) The first item shall be Soft Mute adjustment. But,
in the case of AM band, the first item shall be Seek Stop
Level adjustment (auto) because there is no Soft Mute
adjustment for AM band.
4. Proceed with the following steps for every adjustment
item:
[Soft Mute Adjustment]
This item exists only in TUNER FM. Make adjustment un-
der the condition when VOLUME=30 and LOUD is OFF.
(Display) S M D – x _ _ _ : Adjustment values, 0 ~ 7, are
shown in “x”.
a. Adjust the value between 0 (18dBμ)~7 with [ ] or
[ ] key (possible to press continuously)
b. After the completion of the adjustment, press and hold
[] key for 2 seconds to start writing the adjustment
values in E2PROM. At the successful completion of
the writing, “EP_WRITE” is displayed
[Seek Stop Level Adjustment (Auto)]
(Display) A T N _ 4. 3 2 V : When at Normal (Local OFF)
(Display) A T L _ 3. 4 5 V : When at Local (Local ON)
Current receive level
a. In the band in which Local Seek ON/OFF is selectable,
Press [AUTO] key briefly to change between Local
Seek ON and OFF.
b. Press and hold [ ] key for 2 seconds to make the cur-
rent receive level to be the seek stop level in order to
start writing the adjustment values in E2PROM. At the
successful completion of the writing, “EP_WRITE” is
displayed. (In this step, use Local Seek ON/OFF setup
to change the destination of the writing.)
[Seek Stop Level Adjustment (Manual)]
(Display) M N N _ 3. 9 8 V : When at Normal (Local OFF)
(Display) M N L _ 4. 4 4 V : When at Local (Local ON)
Adjustment values: Contents
written in E2PROM as the
initial values are displayed.
a. In the band in which Local Seek ON/OFF is selectable,
Press [AUTO] key briefly to change between Local
Seek ON and OFF.
b. Manually adjust the seek stop level between 0.00~
5.00V according to the destination with [ ] or [ ]
key (possible to press continuously).
c. Press and hold [ ] key for 2 seconds to make the volt-
age that is adjusted in the above step to be the seek
stop level and to start writing the voltage in E2PROM.
At the successful completion of the writing, “EP_
WRITE” is displayed. (In this step, use Local Seek ON/
OFF setup to change the destination of the writing.)
5. Press [ ] key briefly to exit from TUNER Adjustment
mode (and to keep running the Test mode).
●K3I forced switching
Every time when [6] key is pressed in FM band, switched in
the following order: AUTO→Forced WIDE→Forced MIDDLE
→Forced NARROW→AUTO. Default status is AUTO, and
displayed as shown below.
· AUTO
· Forced WIDE
· Forced MIDDLE
· Forced NARROW
aF1
wF1
mF1
nF1
TEST MODE

13
KDC-HD942U
●CD source test mode specification
· Jumps to the following tracks by pressing the [ ] key.
No.9→No.15→No.10→No.11→No.12→No.13→No.22→
No.14→No.9 (recursive)
Note that when playing a CD-DA disc and MP3/WMA/
AAC discs with 8 files or less, the disc is played from
No.1 track in the normal order.
· Pressing the [ ] key goes back by 1 track from the
track being played
· While in CD source, press the [1] key ([1] and [FM] keys
are for CD-DA) briefly to jump to No.28.
· While in CD source, press the [2] key briefly to jump to
No.14.
· While in CD source, press the [3] key briefly to display
CD mechanism model name and the version. Press the
[3] key briefly again to return to the normal display. (Time
code display)
9E30 V0123
SERV V1 . 23
BOOT V1.23
· While in CD source, press the [5] key briefly to repeat
No.9 and No.22 (Jump toggle operation between No.9↔
No.22)
· Jump to No.9 if the track in play is not No.9.
· Jump to No.22 if the track in play is No.9.
· While in CD source, press the [6] key ( [6] and [AM] keys
are for CD-DA ) briefly to jump to No.15. At this time, the
volume value is set to 21 (2V-PRE), 24 (4V-PRE).
(
∗1) Only in the test mode, [1] key, [2] key, [3] key and [6]
key shall be displayed on the multi-function key.
1. Press the [FNC] key briefly to make the multi-function
display.
2. Rotate the control knob on the right side and use the
[FM] or [AM] key to display the target key in the center.
3. Press the [ ] key briefly to finalize the display.
(
∗2) Perform the same operations as above on the keys,
[1], [2], [3], [5] and [6] on the remote controller.
· While in CD source, press the [AUTO] key briefly to jump
to No.15 and set the volume value to 21 (2V-PRE) or 24
(4V-PRE).
· While in CD source, press [AUTO] key for 1 second to
jump to No.9 and set VOLUME to “35” (Refer to ∗)
∗Due to circuit request (due to DCErr), E-VOL latter
phase Gain (Fader Gain) setting at VOLUME “35” is set
as below in the test mode, CD (USB) source, and DSP
Bypass.
Normal +2dB →+6dB
●AUDIO adjust mode
· Press the [AUD] key briefly to enter the audio adjustment
mode.
· Press the remote control [¼] key and [AUD] key to enter
the audio adjustment mode.
· Both AUDIO FUNCTION MODE and SETUP MODE ad-
justment items are included.
· By pressing [AUD] and [FM] key briefly, switch the item to
be adjusted in the following order. (Only in forward rota-
tion)
The default item shall be DSP Bypass/Through switch
and shall be Bypass/Through→Dual Zone→Fader→
Balance→SubWoofer→VolumeOffset.
· Continuous forwarding by remote control is prohibited.
· BYPASS is adjusted by the VOL knob and [ ] or [ ]
key in 2 steps: BYPASS↔THROUGH. (Default value: BY-
PASS ) ∗Displayed only in the test mode.
· Dual Zone ON/OFF is adjusted by the VOL knob and [ ]
or [ ] key in 2 steps: OFF↔ON. (Default value: OFF)
· Fader is adjusted by the VOL knob and [ ] or [ ] key
in 3 steps: R15↔0↔F15. (Default value: 0)
· Balance is adjusted by the VOL knob and [ ] or [ ]
key in 3 steps: L15↔0↔R15. (Default value: 0)
· Sub Woofer Level is adjusted by the VOL knob and [ ]
or [ ] key in 3 steps: -15↔0↔+15. (Default value: 0)
· Volume Offset (Built in AUX OFF) is adjusted by the VOL
knob and [ ] or [ ] key in 2 steps: -8↔0. (Default
value: 0)
· Volume Offset (Built in AUX ON) is adjusted by the VOL
knob and [ ] or [ ] key in 3 steps: -8↔0↔+8. (Default
value: 0)
●MENU
· Press the [FNC] key briefly to make the multi-function
display and press the [ ] key to select MENU item, and
press the [ ] key briefly to enter the MENU.
· Press the remote control [DNPP/SBF] key and the [DI-
RECT] key to enter the MENU.
· Continuous forwarding by remote control is prohibited.
· Only in the Test mode, [PHONE-SEL] (Phone Selec-
tion) shall be added to the multi-function display in the
STANDBY source and place it as the initial item (head).
· Only in the Test mode, it shall be made possible to show
“ROM Write Mode” and “ROM Read Mode” items in the
STANDBY source MENU to allow the ROM data transfer
process.
TEST MODE

14
KDC-HD942U
●Backup current measurement
If reset while in ACC OFF (Back Up ON) condition, MUTE
terminal goes off 2 seconds later, rather than 15 seconds.
(During this time, the CD mechanism does not function.)
●Special displays while all lights are on
When all lights are on with STANDBY source, if the follow-
ing keys are pressed, the following messages are displayed.
[FM]
key
Key pressed briefly: ROM correction version is displayed
(Display) SYS_ROM_R1234
(Display) PAN_ROM_R1234
(Display) BOL_ROM_R1234
When E2PROM is not installed: ROM_ ERR _ _
When not written in: ROM_R––––
When data not matching: ROM_ R ∗∗∗∗
[]
key
Key pressed briefly: AUDIO data initialization
(Display) AUD I O_ I N I T
[]
key
Key pressed briefly: Forced Power OFF data displayed.
Press and hold: To clear the forced power OFF infor-
mation. (Press and hold for 2 seconds while the forced
power OFF data is displayed.)
(Display) POFF_––– (No Forced Power OFF)
SEC (Forced Power OFF because of
missing Security Code)
PNL (Forced Power OFF because of
system μ-com and panel com-
munication error)
[AUD]
key
Key pressed briefly: iPod authentication IC installation
status display
(Display) i Pod_OK_ (Installation status OK)
NG_ (Installation status NG)
[FNC]
key
Key pressed briefly: Multi-function display
Press and hold: Version & Service information display
mode ON
Refer to the Table 1.
[1]~[6]
key
(Remote
controller)
Key pressed briefly: Version & Service information dis-
play mode ON
Refer to the Table 1.
[] key Key pressed briefly: CD information display mode ON
Refer to the Table 2.
Table 1 - Version & Service information display mode
([1]~[6] keys: Remote controller)
[AM]
key
↑
↓
[FM]
key
[1]
key
Key pressed briefly: Version is displayed (Switch)
(Display) C0863WK_ _SYS1 . 23
(Display) STYPE : xx_PAN1 . 11
(Display) PTYPE : x__
(Display) 9B30_Vxxxx
↓↑: Switch with the remote controller [1] key or [ ]
or [ ] key.
∗“STYPE” indicates destination of system μ-com
and “PTYPE” indicates destination of panel μ-com,
and they display the status of destination terminal
in real-time.
(Display) BT _ V ER : HWx x x _ SWx x x
BT module H/W & S/W Version
(Display) ADDR : xxxxxxxxxxxx
BT module Address
(Display) P I N : x x x x x x x x
BT module PIN Code
[2]
key
Key pressed briefly: Serial No. is displayed (8 digits)
(Display) S N o _ x x x x x x x x
[3]
key
Key pressed briefly: Power ON time is displayed.
(Display) P o n T i
m _0Hxx_
(00~50 is displayed for “xx”. When less than 1
hour, display by increment of 10 minutes.)
(Display) x x x x x
(00001~10922 is displayed for “xxxxx”.)
MAX 10922 (hours)
[4]
key
Key pressed briefly: CD operation time is displayed.
(Display) C D T i
m __0Hxx_
(00~50 is displayed for “xx”. When less than 1
hour, display by increment of 10 minutes.)
(Display) x x x x x
(00001~10922 is displayed for “xxxxx”.)
MAX 10922 (hours)
[5]
key
Key pressed briefly: Number of CD EJECT times is
displayed.
(Display) E j e C n t _ x x x x x
MAX 65535 (times)
[] key
Key pressed briefly: Invalid
Press and hold: To clear the service information that
is being displayed. (Press and hold for 2 seconds
while each service information is displayed.)
[FNC] key Key pressed briefly: Version & Service information
display mode OFF
TEST MODE

15
KDC-HD942U
Table 2 - CD information display mode
[AM]
key
↑
↓
[FM]
key
I2C communication condition and CD mechanism error log
display
(Display) I 2 C _ {{ ____________
(Display) E R R _ 1 – UU ,2–
UU ,3– UU
“OK” or “NG” is displayed for “{{”. “– –“ or the error code
is displayed for “UU”.
CD loading error log display
(Display) L o a d _ E r r o r ____
(Display) _ _ ( 1 ) x x _ _ ( 2 ) x x
(Number of times is displayed for “xx”.)
MAX 99 (times)
CD ejection error log display
(Display) E j e c t _ E r r o r _ _ _
(Display) _ _ ( 1 ) x x _ _ ( 2 ) x x
(Display) _ _ ( 3 ) x x _ _ ( 4 ) x x
(Number of times is displayed for “xx”.)
MAX 99 (times)
CD time code error count data display (missing counts)
(Display) C o u n t _ L o s e
(Display) _ _ C D D A _ : x x
(Display) _ _ C D R OM : x x
(Number of times is displayed for “xx”.)
MAX 99 (times)
CD time code error count data display (count not updated)
(Display) C o u n t _ S t a y
(Display) _ _ C D D A _ : x x
(Display) _ _ C D R OM : x x
(Number of times is displayed for “xx”.)
MAX 99 (times)
[]
key
Key pressed briefly: CD information display mode OFF
Press and hold: To clear entire CD information (Press and
hold for 2 seconds)
●Initializing AUDIO-related setting value
Press the [ ] key briefly in the STANDBY source to reset
the AUDIO setting value to the test mode default value.
●Other
· When Power ON, do not display “CODE_NG”, “CODE_
OFF”, and “CODE_ON”.
· When started with the test mode, set the LINE MUTE
prohibition time from 10 to 1 second.
· When in the test mode, when DC offset error detection
is run, the detection information is not written into the
E2PROM.
· When in the test mode, even if the specified time has
passed, back-up memory items are not written into
E2PROM.
· DEMO mode shall not be operated while in the test
mode, Backup/Installer Memory & CD Mechanism Infor-
mation & Service Information & DC offset Error Detection
Information & BT Memory Information Clear Mode, and
DC offset Error Detection Information Clear Mode.
Also, do not display DEMO ON/OFF option items in the
MENU in the above modes.
●Panel combination check
To avoid improper connection of the main body and panel,
the below will be indicated in STANDBY source in the test
mode according to the combination of system μ-com and
panels
K destination mother + K destination panel
E destination mother + E destination panel
M destination mother + M destination panel
J destination mother + J destination panel
OK !
K destination mother + J destination panel
NG
_Mo t h e r : K
_Pane l _ : J
NG !
K destination mother + M destination panel (M destination:
KDC-X7013U/XBT8013U)
NG
_Mo t h e r : K
_Pane l _ :M
NG !
K destination mother + M3 destination panel (M3 destina-
tion: KDC-X7013UL/XBT8013UL)
NG
_Mo t h e r : K
_Pane l _ :M3
NG !
E destination mother + J destination panel
NG
_Mo t h e r : E
_Pane l _ : J
NG !
E destination mother + M destination panel (M destination:
KDC-X7013U/XBT8013U)
NG
_Mo t h e r : E
_Pane l _ :M
NG !
TEST MODE

16
KDC-HD942U
E destination mother + M3 destination panel (M3 destina-
tion: KDC-X7013UL/XBT8013UL)
NG
_Mo t h e r : E
_Pane l _ :M3
NG !
M destination mother + K or E destination panel (M destina-
tion: KDC-X7013U/XBT8013U)
NG
_Mo t h e r : M
_Pane l _ :K/E
NG !
M destination mother + J destination panel (M destination:
KDC-X7013U/XBT8013U)
NG
_Mo t h e r : M
_Pane l _ : J
NG !
J destination mother + K or E destination panel
NG
_Mo t h e r : J
_Pane l _ :K/E
NG !
J destination mother + M destination panel (M destination:
KDC-X7013U/XBT8013U)
NG
_Mo t h e r : J
_Pane l _ :M
NG !
J destination mother + M3 destination panel (M3 destina-
tion: KDC-X7013UL/XBT8013UL)
NG
_Mo t h e r : J
_Pane l _ :M3
NG !
Note: Power will be forcefully and immediately shut off if the
normal start up is performed with any of the combination of
NG indications above (not test mode start up).
●Clearing backup / installer memory & CD
mechanism information & service information
& DC offset error detection information (Clear-
ing E2PROM data)
1. Press and hold [SRC] and [AUD] keys and reset-start to
start initialization process of Backup/Installer Memory
Data, CD Mechanism Information, Service Information,
DC Offset Error Detection Information, and Hybrid Mem-
ory
(While “– – ––” is being displayed, power can be ON for
30 minutes.)
[CD mechanism information]
· Displays I2C communication condition
· Displays CD mechanism error log
· Displays CD loading error data
· Displays CD ejection error data
· Displays CD time code error count data (missing count).
· Displays CD time code error count data (count not up-
dated).
[Service information]
· Displays power ON time is displayed
· Displays CD operation time.
· Displays number of CD EJECT times.
· Displays forced Power OFF data
[DC offset error detection information]
· DC offset error detection display 1
· DC offset error detection display 2
[HD memory information]
· Backup memory (preset/frequency)
· iTunes Tagging data
2. After the initialization process is completed, the following
is displayed.
When successfully completed
HD _ E 2 P _ CL R : |
M other_E2P_CLR:|
TUN_ E2P_CLR :|
M other_E2P_CLR:–
TEST MODE

17
KDC-HD942U
When finished but unsuccessful 1: Mother E2PROM initial-
ization NG
HD _ E 2 P _ CL R : |
M other_E2P_CLR:°
When finished but unsuccessful 2: HD-related E2PROM ini-
tialization NG
HD _ E 2 P _ CL R : °
M other_E2P_CLR:|
When finished but unsuccessful 3: All initialization NG
HD _ E 2 P _ CL R : °
M other_E2P_CLR:°
3. In this mode, even if the specified time has passed, the
backup memory items are not written into E2PROM.
4. This mode is cancelled by resetting. (The last screen will
not be retained.)
Note: In this mode, the DC offset error detection display,
“Protect” is not shown.
Note: Do not operate any keys in this mode (during clear-
ing) including power OFF/ON.
●Clearing DC offset error detection information
(E2PROM data clearing)
1. Press and hold [SRC] and [ ] keys and reset-start to go
into the DC offset error display mode.
(While “– – ––” is being displayed, power can be ON for
30 minutes.)
2. While in STANDBY source, the current DC offset error
detection condition is displayed.
1st
row
DC offset error detection display 1 (To show such detec-
tion as the improper connection, and other detection)
(Display) DC 1 _ OK _ _ (not detected)
E R R _ (Improper connection or other er-
ror is detected.)
2nd
row
DC offset error detection display 2 (To show the number
of capacitor leaks.)
(Display) DC 2_0___ (not detected)
1 (Leak is detected once.)
2 (Leak is detected twice.)
3 (Leak is detected 3 times.)
4
(Leak is detected 4 times or more.)
3. While the DC offset error detection condition is being
displayed as above, press and hold [1] key for 2 seconds
to clear the information about the improper connection,
and other detection. Press and hold [2] key for 2 seconds
to clear the information about the number of capacitor
leaks. (Clear E2PROM)
4. DC offset error display mode is cancelled by resetting.
(The last screen will not be retained.)
Note: In this mode, the DC offset error detection display,
“Protect” is not shown.
●FM/AM channel space switching
FM: 50kHz↔200kHz, AM: 9kHz↔10kHz
While power is OFF, press and hold [AUD] and [ ] keys,
and press [SRC] key to power ON.
●Security
• How to enter the forced POWER ON mode
While “––––” is being displayed, while simultaneously
pressing [FNC] key and [ ] key, press [RESET] button.
With this, it is possible to turn the power on for 30 minutes
only.
• How to clear the security code
1. While “––––” is being displayed, press [ ] key for 3
seconds or longer while pressing the [AUTO] key. (This
makes the “– – – –” display disappear.)
2. Input “KCAR”, using the remote controller.
Press [5] key of the remote controller 2 times (Input for “K”)
and press [ ] key.
Press [2] key of the remote controller 3 times (Input for “C”)
and press [ ] key.
Press [2] key of the remote controller once (Input for “A”)
and press [ ] key.
Press [7] key of the remote controller 2 times (Input for “R”)
and press [ ] key.
3. The security is cleared and the unit enters STANDBY
mode.
4. If wrong codes are input, “– – – –” will be displayed again.
TEST MODE

18
KDC-HD942U
At specialists (or specialty stores), when the installer sends
the vehicle back to the user, they may make the store-rec-
ommended audio configuration.
When the user changes the setting values, when the backup
power supply was taken out at times of battery change or
when the reset button was pressed, to make it possible to
recall the setting values, the store-recommended configura-
tion values can be saved into E2PROM.
The specification detail defer in “with-DSP model” and in
“without-DSP model”.
[Models with DSP]
· Calling and saving the configuration is done by the multi-
function key. ([Preset-1])
· Items to be saved are Cabin, Position, Speaker, EQ,
X’over, D.T.A., and Sub Woofer Level. Only one setting
can be saved for each item. (EQ setting can be changed
for each source, but only one setting can be saved as the
installer memory specification, and the source in which
the saving operation was carried out is saved as such.)
Also, the setting values of all Preset Positions will be
memorized for the setting value of Manual Position. (6
speakers x4)
· The contents read out by the call key shall be reflected
only to the current source at the time. →EQ curve is
“USER”. (EQ setting can be changed for each source,
but not reflected to EQ settings of sources other than
where the calling operation was carried out.)
· When the backup power supply was taken out at times
of battery change or when the reset button was pressed,
as the initial setting values of Cabin, Position, Speaker,
EQ, X’over, D.T.A., and Sub Woofer Level, the saved
memory is reflected (EQ setting initial setting value mem-
ory is reflected in all sources).
NOTE: By such, EQ curve initial setting shall always be
“USER”. (NOT “NATURAL” or “FLAT”.)
INSTALLER MEMORY SPECIFICATIONS
USER MEMORY SPECIFICATION (ONLY WITH-DSP MODELS)
In with-DSP models, audio-settings set by users’ prefer-
ence, as well as the setting by the installer, can be saved
into the E2PROM. (1 memory of [Preset-2])
When the user changes the setting values, when the back-
up power supply was taken out at times of battery change,
or when the reset button was pressed, to make it possible
to recall the setting values, the store-recommended con-
figuration values can be saved into E2PROM. (The memory
is saved separately from the installer memory.)
Also, they will not be memorized in E2PROM aside from
above, but another memory will be prepared to memorize
them until the backup power supply is taken out or the reset
button is pressed. (4 memories of [Preset-3] – [Preset-6])
· Calling and saving the configuration is done by the multi-
function key. ([Preset-2] and [Preset-3] – [Preset-6])
· Items to be saved are Cabin, Position, Speaker, EQ,
X’over, D.T.A., and Sub Woofer Level. Only one setting
can be saved for each item (EQ setting can be changed
for each source, but only one setting can be saved as
the user memory specification, and the source in which
the saving operation was carried out is saved as such).
Also, the setting values of all Preset Positions will be
memorized for the setting value of Manual Position. (6
speakers x4)
· The contents read out by the call key shall be reflected
only to the current source at the time. →EQ curve is
“USER”. (EQ setting can be changed for each source,
but not reflected to EQ settings of sources other than
where the calling operation was carried out.)

19
KDC-HD942U
Settings by the user other than the installer memory items
are saved into the E2PROM, and when the backup power
supply was taken out at times of battery change or when
the reset button was pressed, it is made possible to recall
the setting values saved.
· While Power ON, the memory is saved and accumulated
at a certain interval.
· Items to be saved into the memory are: Volume Offset (for
all sources) and preset frequencies (FM/AM all bands x 6
channels).
BACKUP MEMORY SPECIFICATIONS
· When the backup power supply was taken out at times
of battery change or when the reset button was pressed,
as the initial setting values of Volume Offset (for all sourc-
es) and preset frequencies (FM/AM all bands x 6 chan-
nels), the saved memory is reflected.
· In models which includes FM/AM channel space switch-
ing, when the space is switched, TUNER-preset frequen-
cies are set back to the default values.

20
KDC-HD942U
Refer to the schematic diagram for the values of resistors and capacitors.
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
115
2
EJECT
RESET
16
D1
J1
S1
S2
DISPLAY UNIT
X15-1220-10 (J76-0576-02)
1
218
17
CN1
DISPLAY UNIT
X15-1220-10 (J76-0576-02)
CN101
CN102
IC1
PROCESSOR UNIT
X17-2050-10 (J76-0612-02)
1
118
13
C198
C180
C181
C114
C126
C151
C110
C112
X101
CP101
CP102
CP103
CP104
CP105
CP106
CP107
CP108
CP109
R104
R105
R106
R107
R110
R111 R112
R113 R114
R115 R116
R121
R122
R123
R124
R160
R161
R163
144109
108
72 37
73 36
VDD
GND
TD
CTS
RTS
RD
PROCESSOR UNIT
X17-2050-10 (J76-0612-02)
Q101
IC2
IC151
1
1
R101
R103
R153
C113
L101
C108
C109
C117
C119
C121
C125
C127
C128
C103
C104
C105
C106
C107
C115
C116
C118
C120
C122
C123
C124
C129
C130
C131
C132
C133
C134
C191
C192
C193 C194 C195
C196C197
R102
R151
R152
C101
C102
C111
C141
C142
C143
C144
C145 C146
C147
C148
R162
R150
R154
4
58
27 28
54
EB
VDD
GND
CTS
RTS
RD
TD
RESET
PC BOARD
(COMPONENT SIDE VIEW)
PC BOARD
(FOIL SIDE VIEW)
ABCDE
1
2
3
4
5
6
7
X17-2050-10
Ref. No. Address
IC1 5B
X17-2050-10
Ref. No. Address
IC2 5E
IC151 5D
Q101 4D