Sharp CD-DK890N User manual

CD-DK890N
SERVICE MANUAL
No. S7838CDDK890N
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
PRECAUTIONS FOR USING LEAD-FREE SOLDER
CHAPTER 1. GENERAL DESCRIPTION
[1] Important Service Safety Precaution.............. 1-1
[2] Important Service Notes (for U.S.A only)........ 1-1
[3] Specifications ................................................. 1-2
[4] Name Of Parts ............................................... 1-3
CHAPTER 2. ADJUSTMENTS
[1] Mechanism Section........................................ 2-1
[2] Test Mode....................................................... 2-2
[3] CD Section..................................................... 2-4
CHAPTER 3. MECHANISM BLOCKS
[1] Caution On Disassembly................................ 3-1
[2]
Removing And Reinstalling The Main Parts ..... 3-4
CHAPTER 4. DIAGRAMS
[1] Main Block Diagrams ..................................... 4-1
[2] CD Block Diagrams....................................... 4-3
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Waveforms Of CD Circuit ..............................5-1
[2] Voltage...........................................................5-2
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1] Notes On Schematic Diagram .......................6-1
[2] Types Of Transistor And LED........................6-1
[3] Schematic Diagram .......................................6-2
[4] Charts Of Connecting Wires .......................6-22
[5] Wiring Side Of PWB ....................................6-24
CHAPTER 7. FLOWCHART
[1] Troubleshooting .............................................7-1
CHAPTER 8. OTHERS
[1] Function Table Of IC......................................8-1
[2] FL Display......................................................8-8
PARTS GUIDE
MINI COMPONENT SYSTEM
CD-DK890N
MODEL
CD-DK890N Mini Component System consisting of
CD-DK890N (main unit), CP-DK890N (speaker system).
CONTENTS
iPod is a registered trademark of Apple Inc.
SHARP CORPORATION
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with
specified ones for maintaining the safety and performance of the set.
!
• In the interests of user-safety the set should be restored
to its original condition and only parts identical to those
specified be used.

CD-DK890N
– i –
AudioXL-MP150Service ManualXLMP150MarketE
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire
solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40°C, we recommend you to
use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our
service station or service branch in your area.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220°C which is higher than the conventional lead solder
extended period of time. However, since the land may be peeled of for the maximum heat-resistance temperature
of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corrected. Make sure to turn on
and off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after
every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Be careful when replacing parts with polarity indication on the PWB silk.
Lead-free wire solder for servicing
Ref No. Description Parts No.
PWB-A 92LPWB7312MANS MAIN (A1), POWER (A2)
PWB-B 92LPWB7312DPLS DISPLAY (B1), AUDIO IN (B2), iPOD TRANSIT (B3)
PWB-C 92LPWB7312PODS iPOD
PWB-D 92LPWB6700CDUS CD
"MAIN, POWER, DISPLAY, AUDIO IN, iPOD TRANSIT, iPOD, CD PWB" of this model employs lead-free solder.
The LF symbol indicates lead-free solder, and is attached on the PWB and service manuals. The alphabetical character
following LF shows the type of lead-free solder.
by 40°C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for

CD-DK890N
–2
CHAPTER 1: GENERAL DESCRIPTION
(Fire & Shock Hazard)
Before returning the audio product to the user, perform
the following safety checks.
1. Inspect all lead dress to make certain that leads are not
pinched or that hardware is not lodged between the
chassis and other metal parts in the audio product.
2. Inspect all protective devices such as insulating
materials, cabinet, terminal board, adjustment and
compartment covers or shields, mechanical insulators
etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
*Plug the AC line cord directly into a 120 volt AC outlet.
* Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as conduit or electrical ground
connected to earth ground.
*Use a VTVM or VOM with 1000 ohm per volt, or
higher, sensitivity to measure the AC voltage drop
across the resistor (See diagram).
* Connect the resistor connection to all exposed metal
parts having a return path to the chassis (antenna,
metal cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
All check must be repeated with the AC line cord plug
connection reversed.
Any reading of 0.3 volt RMS (this corresponds to 0.2
milliamp. AC.) Or more is excessive and indicates a
potential shock hazard which must be corrected before
returning the audio product to the owner.
[2] Important Service Notes (for U.S.A only)
BEFORE RETURNING THE AUDIO PRODUCT
[1] Important Service Safety Precaution
CAUTION : “These servicing instructions are for use by qualified service personnel only. To reduce
the risk of electric shock do not perform any servicing other than that contained in the operating
instructions unless you are qualified to do so”.
WARNING
1. For continued safety, no modification of any circuit should be
attempted.
2. Disconnect AC power before servicing.
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
TEST PROBE
0.15 µ F
1.5k ohms
10W
VTVM
AC SCALE
CAUTION: FOR CONTINUED
PROTECTION AGAINST FIRE
HAZARD, REPLACE ONLY WITH
SAME TYPE F801, F802, F805 4A, 125V/
F80, F804 2.5A, 125V FUSES.
TYPE F801, F802, F805 4A, 125V/
F803, F804 2.5A, 125V FUSES.
ATTENTION: POUR ASSURER
UNE LONGUE PROTECTION CONTRE
UN INCENDIE, REMPLACER SEULEMENT
PAR UN FUSIBLE DE
1 – 1

CD-DK890N
– 4
[3] Specifications
General
Power source AC 120 V ~ 60 Hz
Power consumption 105 W
Dimensions Width: 10 - 1/4" (260 mm)
Height: 13" (342.7 mm)
Depth: 12 - 7/8" (324 mm)
Weight 16.32 lbs. (7.4 kg)
Amplifier
CD player
Tuner
Cassette deck
Speaker
Output power RMS : Total 250 W (125 W per channel into
6 ohms at 1 kHz, 10% Total
harmonic distortion.)
FTC : 90 W minimum RMS per channel
into 6 ohms from 100 Hz to 20 kHz,
10% Total harmonic distortion.
Output terminals Front Speakers: 6 ohms
Headphones: 16 - 50 ohms
(recommended: 32 ohms)
Video output: 1Vp-p
Input terminals Audio In (audio signal):
250 mV/47 k ohms
Type 5-disc multi-play compact disc player
Signal readout Non-contact, 3-beam semiconductor laser
pickup
D/A converter 1-bit D/A converter
Frequency
response
20 - 20,000 Hz
Dynamic range 90 dB (1 kHz)
Frequency range FM: 87.5 - 108.0 MHz
AM: 530 - 1,720 kHz
Frequency
response
50 - 14,000 Hz (normal tape)
Signal/noise ratio 55 dB (TAPE 1, playback)
50 dB (TAPE 2, recording/playback)
Wow and flutter 0.3 % (WRMS)
Type 2-way type speaker system
2" (5 cm) tweeter
6 - 5/16" (16 cm) woofer
Maximum input
power
250 W
Rated input power 125 W
Impedance 6 ohms
Dimensions Width: 7 - 7/8" (200 mm)
Height: 13" (330 mm)
Depth: 8 - 11/16" (220.5 mm)
Weight 7.0 lbs. (3.18 kg)/each
1 – 2

CD-DK890N
–2
[4] Names Of Parts
Front panel
1. iPod Terminal
2. Disc Trays
3. Timer Indicator
4. Power On/Stand-by Button
5. CD Button
6. Tape (1 2) Button
7. Tuner (Band) Button
8. Audio In/iPod Button
9. CD or Tape Stop Button
10. CD Track Down or Fast Reverse, Tape 2 Rewind, Tune
r
Preset Down, Time Down Button
11. Tuning Down, Cursor Down Button
12. Tape 1 Cassette Compartment
13. Headphone Jack
14. Audio In Jack
15. Remote Sensor
16. Volume Control
17. CD, iPod Play or Pause,
Tape Play Button
18. Disc Tray Open/Close Button
19. Disc Number Select Buttons
20. CD Track Up or Fast Forward, Tape 2 Fast Forward,
Tuner Preset Up, Time Up Button
21. Tuning Up, Cursor Up Button
22. Tape 2 Cassette Compartment
Display
Rear panel
1. Disc Number Indicators
2. MP3/WMA Folder Indicator
3. MP3/WMA Title Indicators
4. MP3 Indicator
5. WMA Indicator
6. Sleep Indicator
7. Timer Play Indicator
8. Timer Recording Indicator
9. Tape 2 Record Indicator
10. MP3/WMA Total Indicator
11. Daily Timer Indicator
12. FM Stereo Mode Indicator
13. FM Stereo Receiving Indicator
14.Tape Play Indicator
15. Memory Indicator
16. Extra Bass Indicator
17. Disc Repeat Play Indicator
18. Disc Pause Indicator
19. Disc Play Indicator
1. Cooling Fan
2. AC Power Cord
3. FM 75 Ohms Antenna Jack
4. AM Antenna Ground Terminal
5. AM Loop Antenna Terminal
6. Video Out Jack
7. Front Speaker Terminals
Speaker system
1. Tweeter
2. Woofer
3. Bass Reflex Duct
4. Speaker Wire
TIMER
CD
4
3
1
5
4
5
3
2
1
PHONES
RECORD/PLAYBACK
PLAYBACK(PL AY& STOP)
2
AUDIO
IN
15
16
17
19
20
21
22
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
12 345 678 9
11 12 13
10 14
15
16 17
1819
A
C INPUT
CIN
PUT
3
7
4
5
2
1
6
2
13
4
1 – 3

CD-DK890N
– 4
Remote control
1. Remote Control Transmitter
2. Disc Number Select Buttons
3. Tuning Up, Cursor Up Button
4. Disc Track Down or Fast Reverse, Tape 2 Rewind,
Tuner Preset Down, Time Down, Cursor Left Button
5. Clock/Timer Button
6. Character Input/Disc Direct Search Buttons
7. Equalizer Mode Select Button
8. Extra Bass/Demo Button
9. On/Stand-by Button
10. CD Button
11. Tuner (Band) Button
12. Tape (1 2) Button
13. Audio In/iPod Button
14. Disc Track Up or Fast Forward, Tape 2 Fast Forward,
Tuner Preset Up, Time Up, Cursor Right Button
15. Tuning Down, Cursor Down Button
16. Volume Up and Down Buttons
17. Clear/Dimmer, iPod MENU Button
18. Play Mode Button
19. Disc Stop Button
20. Tape Stop Button
21. Memory, iPod ENTER Button
22. iPod Play/Pause Button
23. Disc Play/Pause Button
24. Tape Play Button
25. Tape 2 Record Pause Button
26. MP3/WMA Navigation Mode Select Button
27. Character Button
28. Display Button
29. Enter Button
1
2
5
7
8
3
4
6
10
11
9
12
13
14
16
15
21
23
22
17
19
18
25
24
20
26 27 28 29
1 – 4

CD-DK890N
2 – 1
CD-ES700/CD-ES77CD-ES700/CD-ES77Service ManualCD-ES700/CD-ES77MarketE
CHAPTER 2. ADJUSTMENTS
[1] Mechanism Section
• Driving Force Check
• Torque Check
• Tape Speed
Figure 1
Torque Meter Specified Value
Play: TW-2111 Tape 1: Over 75 g
Tape 2: Over 75 g
Torque Meter Specified Value
Tape 1 Tape 2
Play: TW-2111 25 to 85 g.cm 25 to 85 g.cm
FF/REW — 45 to 195 g.cm
BACK TENSION 1.2 to 7.0 g.cm 1.2 to 7.0 g.cm
Test Tape Adjusting
Point
Specified
Value
Instrument
Connection
Normal
speed
MTT-111 Variable
Resistor in
motor.
3,000 ±90 Hz
Speaker
Speaker
Terminal (Load
resistance:
6 ohms)
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor

CD-DK890N
2 – 2
[2] CD Section
CD Error code description
* 'CHECKING'
If Error is detected, 'CHECKING' will be displayed instead of 'ER-CD**'. 'ER-CD**' display will only be displayed
when error had been detected for the 5th times.
Standard Specification of Stereo System Error Message Display Contents
(*) CHECKING:
If CD changer mechanism error is detected, 'CHECKING' will be display instead of 'ER-CD**'. 'ER-CD**' display will
only be display when error had been detected for the 5th times.
Speaker abnormal detection and +B PROTECTION display
In case speaker abnormal detection or +B PROTECTION had occurred, the unit will automatically enter to stand - by
mode and Timer indicator will be flashing as below.
+B PROTECTION is condition when irregular process occur on power supply line.
BEFORE TRANSPORTING THE UNIT
The following process need to be taken after set tapering/parts replacement.
1. Press the ON/STAND-BY button to enter stand-by mode.
2. While pressing down the button and the button, press the ON/STAND-BY button. The Micro Computer
version number will be displayed as "CP*1001".
3. Press button until "WAIT"→"FINISHED" appears.
4. Unplug the AC cord and the unit is ready for transporting.
Error Explanation
10* CAM error. Can't detect CAM switch when CAM is moving.
11* When it detect cam operation error during initialize process.
20* TRAY error. Can't detect TRAY switch when TRAY is moving.
21* When it detect TRAY operation error during initialize process.
31 When it change to CD function, DSP cannot read initial data.
Error Contents Display Notes
CD CD Changer Mechanism Error. 'ER-CD**' (*) 10: CAM SW Detection NG during normal operation
11: CAM SW Detection NG during initialize process
20: TRAY SW Detection NG during normal operation
21: TRAY SW Detection NG during initialize process
CD DSP Communication Error. 'ER-CD31' DSP COMMUNICATION ERROR.
Focus Not Match/IL Time Over. 'NO DISC'
TUNER PLL Unlock. PLL Unlock.
FM 87.5 MHz
FLASHING
1 FRAME
OFF OFF OFF OFF
(REPEAT)
ON
TIMER
LED
ON
NO. 1
NO. 2
NO. 1
NO. 2
NO.1 : +B Protection
NO.2 : Speaker abnormal
FLASHING
Example : In case of speaker abnormal

CD-DK890N
4 – 1
CHAPTER 4. DIAGRAMS
[1] Main Block Diagrams
Figure 4-1: MAIN BLOCK DIAGRAM (1/2)
REC/PLAY
BIAS
T1/T2
IC101
AN7345K
PLAYBACK AND RECORD/
PLAYBACK AMP.
R
L
L
R
JKA701-AUDIO IN
Q104
Q101-
Q108
Q107
CLK
CE
DI
+B4
L
R
BIAS
T1/T2
MUTING
P.B.
REC.
AC BIAS
L
L
R
R
R
L
TAPE/
TUNER
IPOD
CD
P.B.
CNP3
FROM CD SECTION
HEAD
ERASE
SWITCHING
SWITCHING
SWITCHING
BIAS
Q113
Q114
Q112
Q110
SWITCHING
Q109
OSC
BIAS Q111
L103
Q105
Q106
REC./P.B. HEAD
TAPE 2
P.B. HEAD
TAPE 1
R-CH
L-CH
IC601
LC75341M
AUDIO
PROCESSOR
TUNER
PACK
UNIT
RTUNSA016AWZZ
+B4
R
L
REC.
R
L
L NF
R NF
ALC
R REC.
L REC.
R NF
L NF
SWITCHING
L(T2)
R(T2)
R(T1)
L(T1)
4
22
3
24
2
1
81817
11
16
3
15
10
9
7
23
14
12
13
19
7
18
10
8
17
13
21
4
2
24
23
9
16
12
1
P.B
REC
T1/T2
21
R-CH
L-CH
TAPE
MECHANISM
ASS'Y
MOTOR
DRIVER
SOLENOID
DRIVER
+B7
+B7
IC701
IXA201AW
MICROCOMPUTER
(2/2)
38
BI601CNS601
1
1
2
3
4
5
6
7
8
9
10
11
3
4
1
3
2
Q703~
Q708
Q709~
Q711
+B4
NC
NO USE
CNP303
CE
DI
CL
DO
CHASIS_GND
L_CH
+9V
R_CH
TUN_SM
FM_DET
CHASIS_GND
9
1
8
13
1
1
11
2
8
12
13
4
3
1
75
8
6
17
12
11
+B6
+B11
+B10
JK691
IPOD SECTION
CNP102
VIDEO
OUT
SP_RLY
T_BIAS
V_OUT
iPOD_RXD
IC602
ICBA3121F
(ISOLATION GROUND)
iPOD_TXD
iPOD_PG
R
L
R
L
R
L
T_REC/PLAY
IC702
BU2092F
T_TI/T2 VDD

CD-DK890N
4 – 2
Figure 4-2: MAIN BLOCK DIAGRAM (2/2)
IC854
AN78L05
RELAY
DRIVER
D842 -
D845
+B5
+B10
+B11
UHSW_5.6V
IPOD_+5V
R860
10 ohm/
5 WATT
IPOD_3.3V
+B PROTECT
+B6
VL+
VLÐ
VHÐ
PT841
SUB POWER
TRANSFORMER
+B6
SW5V D803
D863
IC851
AN80T53
VOLTAGE REGULATOR
D905
AC 120 V ~ 60 Hz
ÐVF
VF2
VF1
AC_RLY
Q801
+B3
+B7
+B4
+B8
D+5V
+B9 A_+5V
+B1
+B2
ÐB1
ÐB2
+B8
+B7
R
L
+B5
RX701
JOG701
JOG
VOLUME
SENSOR
REMOTE
D804
D802
D801
RL914
JK692
HEADPHONES
MOTOR
DRIVER
SPEAKER
RELAY
PT801
MAIN POWER
TRANSFORMER
M901
FAN MOTOR
SO902
SPEAKER
TERMINAL
M
Q906
Q905
Q712
Q713
Q904
Q901
Q903
Q902
D906
D907
2.5A/125V
F803
2.5A/125V
F804
4A/125V
F805
RL841
F801
4A/125V
F802
4A/125V
L-OUT
R-OUT
CLK
8.388 MHz
RESET
L-CH
R-CH
AC POWER
SUPPLY CORD
R
EC/PLAY
VLOAD
RESET
CP_SOMO CP_CLK
CD_D0 CD_D1
CD_CLK
CD_CE
CP_SOMI
IPOD_DETECT
IPOD_TX
IPOD_RX
F1 F1
F2
F2
+B5
+B5
+B5
VDD
VDD
SP_RLY
VDD
SP. DET.
-
CE
DI
DO
XL701
-
BIAS
T1/T2
AVDD
PHOTO
SP_DET
REMO CON
SW707-SW716
SW701-SW705
KEY
SECTION
TO CD
T.F.
IC701
IXA201AW
SYSTEM
MICROCOMPUTER
FL DISPLAY
FL701
5150
27 4712 54
78
98
26
25
1
2
4
6
3334
11
7
8
256
VH+
1
3
3
7
2
6
1
1
14
18
99
79
1
2
3
100
17 1642 18 13 10 43 44 45 46
41 55 5
27
268
1415408
-
-
CONSTANT
VOLTAGE REGULATOR
LD+8V
M+13V
A+10V
+5V
IC901
---
57 77
-
IC901
STK412-410
POWER AMP.
Q841
BIAS
T1/T2
80
20
22
21
30 29 2831
32
9
18
+B5
+B5
S
P_RLY
F
VDD
1
1
32
3IC852
KIA7805AP
IC892
AP2213M33E

CD-DK890N
4 – 3
[2] CD Block Diagrams
Figure 4-3: CD BLOCK DIAGRAM
181968
5251
74
7875
76 876521
37
26
20
40
32
24
25
22
23
54
55
56
77
71
67
57
73
72
49
48
47
46
45
44
43
PUIN
DRIVER
SPIN/SLIDE
FOCUS/TRACKING/
LA6261
IC2
VIN4
FWD6
VO6+
VO6-
VO5+
VO5-
REV6
VIN3 VIN2
PVCC1
SVCC
PVCC2
VCONT6
VCONT5
VIN1
REV5
REG IN
REG OUT
FWD5
IC1
LC78690E
CD SERVO
LCHO
RCHO
CONT1 CONT0
SLDO
SPDO
FDO
TDO
LDD LDS DIN BIN
1413
FIN EIN CIN AIN LRVDD XVDD DVDD DVDD DVDD
36 41
AVDD
XIN
XOUT
INTB1
INTB0
66
38
DVDD 1.8
DVDD 1.8
RESB
DO
DI
CL
CE
TO DISPLAY SECTION
TO MAIN SECTION
CNP3
CNP7
M1
TRAY MOTOR
MGND
PICKUP UNIT
IN
PICKUP
NSW 1
+3.3V
MOTOR
SPINDLE
NM1
MOTOR
SLED
NM2
COIL
TRACKING
FOCUS COIL
16.9344 MHz
XL1
+7.5V
DRIVER
LASER
+3.3V
CONSTANT
VOLTAGE
+3.3V
+3.3V
Q1
R-CH AGND L-CH D_+5V(+B5)
+5V GND PHOTO MO_A- CD_RES MO_A+ CD_DI CD_DO CD_CLK CD_CE
+
--
+7.5V
7
27
28
24
21
9
17151311 23
22 32 3331 34
30
19
20
26
8
10
456
Q2
Q3
3363521
71 2 3 4 5 6 10
MP3_INT
11
CD_INT
12
TRAY SW1/SW2 GND
RX1
SW3 TRAY SW2 SW2 TRAY SW1 SW1 CLAMP SW4 DISC
PHOTO 5V
13
DISC/CLAMP
1431 987652 4
CNP4
10 1131 987652 4
53
M
M2
MAIN CAM
MOTOR
+
M
M
M
42
DGND

CD-DK890N
5 – 1
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Waveforms Of CD Circuit
IC1
IC1
IC1 IC1
IC1 IC1
IC1
IC1
IC1
IC1
IC1
IC1
1
22
23
2
22
25
22
16
28
22
27
2RFOUT
1
7
6
5
1
3
1
4
FDO
TDO
FDO
SPDO
PDOUT 1
PDOUT 0
FDO
FDO
TE
TE
16
RFOUT
2
3
4

CD-DK890N
5 – 2
[2] Voltage
IC702
NO
VOLTAGE
VOLTAGE
VOLTAGEVOLTAGE
IC101(IPOD) IC602
IC892
PIN
NO
1 20.35
20.00
34.99
IC852
VOLTAGE
PIN PIN PIN
NO NO
1 0.00 1 0.18 1 2.94
2 0.00 2 0.00 2 2.91
3 0.00 3 0.66 3 2.90
4 0.00 4 2.12 4 0.00
5 0.00 5 1.34 5 2.90
6 0.00 6 0.00 6 2.90
7 0.00 7 -0.15 7 2.95
8 0.00 8 -0.21 8 5.08
91.55 9-0.31
10 1.24 10 -0.36
11 0.00 11 0.00 PIN
12 1.90 12 0.13 NO
13 1.04 13 1.94 1 4.99
14 12.98 14 0.13 2 4.99
15 12.98 15 -0.22 3 3.41
16 12.91 16 0.00 4 2.10
17 0.00 17 -0.31 5 0.00
18 4.88 18 0.00 6 0.00
19 -0.15 7 0.00
20 -0.29 8 0.00
(V) (V) (V) (V) (V)
(V)
(V)
VOLTAGE
PIN PIN
VOLTAGE
NO NO
1 4.91 51 -0.20
2 4.90 52 4.54
3 4.90 53 4.54
4 4.90 54 0.00
5 5.00 55 0.00
6 3.83 56 0.00
7 5.07 57 0.00
8 6.02 58 -29.43
9 5.07 59 -29.43
10 5.07 60 -29.43
11 5.07 61 -29.43
12 1.40 62 -29.43
13 1.40 63 -29.43
14 0.00 64 -29.43
15 0.00 65 -29.43
16 2.17 66 -29.43
17 2.60 67 -29.43
18 4.57 68 -29.43
19 0.00 69 -29.43
20 4.88 70 -26.56
21 1.30 71 -29.43
22 4.08 72 -29.43
23 3.90 73 -18.68
24 1.77 74 -26.56
25 5.04 75 -26.71
26 5.05 76 -21.36
27 4.77 77 0.00
28 0.17 78 -0.16
29 4.50 79 4.56
30 4.50 80 -29.57
31 1.32 81 -16.00
32 0.00 82 -26.75
33 0.00 83 -18.70
34 5.07 84 -23.91
35 4.03 85 -23.53
36 1.97 86 -29.04
37 0.31 87 -20.82
38 1.99 88 -15.57
39 -0.59 89 -26.33
40 0.00 90 -26.27
41 4.57 91 -26.28
42 4.71 92 -26.28
43 0.00 93 -26.28
44 0.00 94 -26.28
45 0.00 95 -26.28
46 5.06 96 -26.28
47 4.93 97 -26.28
48 1.35 98 -26.28
49 1.36 99 -26.28
50 4.56 100 -26.09
IC701

CD-DK890N
5 – 3
PIN
NO
10
20
30
4 4.98
5 4.95
6 4.96
7 4.99
8 4.96
9 4.96
10 4.99
11 4.96
12 4.96
13 4.96
14 4.96
15 4.96
16 4.96
17 4.99
18 4.96
19 4.96
20 4.96
21 4.96
22 4.98
23 9.95
24 0
PIN
NO
1 53.7
2 22.7
3 10.7
4 -10.7
5 -22.7
PIN VOLTAGE
6 -53.7
NO
70
10
80
20
90
30
10 0
42
11 0
52
12 -52.2
6 1.32
13 52.4
70
14 0
8 0.6
15 0
9 3.48
16 -51
10 3.44
17 0
11 0
18 0
12 0
13 6.9
14 4.18
15 0
16 3.45
17 0.6
18 0
19 2.59
20 2
21 2
22 0
23 0
24 0
IC 901
VOLTAGE
IC101 (MAIN)
IC 601
VOLTAGE
IC 1
PIN
NO
VOLTAGE
(V)
PIN
NO
VOLTAGE
(V)
PIN
NO
VOLTAGE
(V)
PIN
NO
VOLTAGE
VOLTAGE
PIN
NO
1 5.06
2 12.83
3 19.6
40
5 18.28
6 9.92
7 8.4
IC 851
VOLTAGE
(V)
(V)(V)(V)
1.59
(V)
1 21 3.24 41 3.13 61 1.55
2 0.47 22 1.62 42 0.01 62 1.93
3 0.39 23 1.63 43 0.05 63 1.93
4 2.79 24 1.62 44 2.93 64 1.93
5 1.63 25 1.64 45 2.88 65 0.00
6 1.63 26 0.00 46 1.87 66 1.81
7 1.63 27 0.33 47 3.13 67 0.00
8 1.63 28 1.62 48 3.13 68 3.13
9 1.63 29 1.10 49 3.13 69 0.03
10 1.63 30 3.05 50 0.00 70 0.02
11 1.64 31 0.00 51 3.12 71 0.01
12 0.00 32 3.26 52 3.12 72 1.34
13 1.63 33 0.03 53 0.00 73 1.53
14 1.63 34 0.03 54 0.00 74 3.01
15 1.62 35 0.03 55 0.00 75 1.54
16 1.64 36 3.26 56 0.00 76 3.23
17 1.63 37 0.02 57 0.00 77 0.00
18 3.27 38 1.81 58 0.00 78 1.59
19 0.00 39 2.56 59 1.58 79 3.24
20 0.00 40 0.00 60 1.57 80 1.59
3.43
IC 2
Q 1
Q 2
Q 3
Q 4
VOLTAGE
(V)
PIN
NO
VOLTAGE
(V)
PIN
NO
VOLTAGE
(V)
PIN
NO
VOLTAGE
(V)
PIN
NO (V)
PIN
NO
VOLTAGE
(V)
PIN
NO
VOLTAGE
(V)
PIN
NO
VOLTAGE
(V)
PIN
NO
1 10 3.28 19 4.51 28 7.64
2 3.50 11 1.65 20 4.50 29 7.58
3 3.44 12 1.65 21 3.45 30 0.00
4 3.48 13 1.65 22 3.10 31 0.00
5 3.44 14 1.65 23 3.10 32 0.00
6 3.49 15 1.65 24 3.09 33 0.00
7 0.00 16 1.65 25 1.65 34 0.00
8 4.20 17 1.65 26 0.02 35 3.49
9 7.63 18 1.65 27 7.64 36 3.45
E 3.26 E 4.86 E 1.81 E 0.00
C 0.10 C 3.27 C 3.26 C 3.28
B 3.23 B 4.19 B 2.33 B 0.00

CD-DK890N
5 – 4
-MEMO-

CD-DK890N
6 – 1
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS LAYOUT
[1] Notes On Schematic Diagram
•Resistor:
To differentiate the units of resistors, such symbol as
K and M are used: the symbol K means 1000 ohm
and the symbol M means 1000 kohm and the resis-
tor without any symbol is ohm-type resistor.
Besides, the one with “Fusible” is a fuse type.
• Capacitor:
To indicate the unit of capacitor, a symbol P is used:
this symbol P means pico-farad and the unit of the
capacitor without such a symbol is microfarad. As to
electrolytic capacitor, the expression “capacitance/
withstand voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
• Schematic diagram and Wiring Side of P.W.Board
for this model are subject to change for improve-
ment without prior notice.
• The indicated voltage in each section is the one
measured by Digital Multimeter between such a
section and the chassis with no signal given.
1. In the tuner section,
indicates AM
indicates FM stereo
2. In the main section, a tape is being played back.
3. In the deck section, a tape is being played back.
( ) indicates the record state.
4. In the power section, a tape is being played back.
5. In the CD section, the CD is stopped.
•Parts marked with “ “ ( ) are impor-
tant for maintaining the safety of the set. Be sure to
replace these parts with specified ones for maintain-
ing the safety and performance of the set.
[2] Types Of Transistor And LED
REF. NO DESCRIPTION POSITION
JOG701 VOLUME MAX—MIN
SW701 POWER ON /STAND-BY ON—OFF
SW702 CD ON—OFF
SW703 TAPE (1 2) ON—OFF
SW704 TUNER (BAND) ON—OFF
SW705 PLAY/PAUSE ON—OFF
SW706 STOP ON—OFF
SW707 FAST REWIND/PRESET DOWN ON—OFF
SW708 TUNING DOWN ON—OFF
SW709 FAST FORWARD/PRESET UP ON—OFF
SW710 OPEN/CLOSE ON—OFF
SW711 DISC 5 ON—OFF
SW712 DISC 4 ON—OFF
SW713 DISC 3 ON—OFF
SW714 DISC 2 ON—OFF
SW715 DISC 1 ON—OFF
SW716 TUNING UP ON—OFF
SW717 AUDIO IN/IPOD ON—OFF
REF. NO DESCRIPTION POSITION
KTA1504 GR
KRA107 S
KRC102 S
KRC104 S
KTA1504 Y
KTC3875 GR
KRC107S
B
(3)
E
(1)
C
(2)
TOP
VIEW
KDS184
TOP VIEW
TOP VIEW
KTA1271 Y
KTA1273 Y
KTA1274 Y
KIA78L05
KIA7805AP
VIEW
FRONT
E C B
(S)(G)(D)
(1)(2)(3)
MA111G
1N4004 HSS4148
DRL204F
D10XB60F
AC AC
VIEW
FRONT
FRONT
VIEW
SLR342VC
KTC3199 GR
KTC3200 GR
KTC3203 Y

CD-DK890N
6 – 2
[3] Schematic Diagram
Figure 6-1: MAIN SCHEMATIC DIAGRAM (1/6)
MAIN PWB-A1
CD SIGNAL
AUDIO SIGNAL
iPOD SIGNAL
FM SIGNAL
PLAYBACK SIGNAL
RECORD SIGNAL
A
B
C
D
E
F
G
H
123456

CD-DK890N
6 – 3
Figure 6-2: MAIN SCHEMATIC DIAGRAM (2/6)
78 9 10 11 12

CD-DK890N
6 – 4
Figure 6-3: MAIN SCHEMATIC DIAGRAM (3/6)
WZX11AW
13 14 15 16 17 18

CD-DK890N
6 – 5
Figure 6-4: MAIN SCHEMATIC DIAGRAM (4/6)
A
B
C
D
E
F
G
H
123456