Sharp CD-C621H User manual

– 3 –
CD-C621H
Cassette deck section
Type: Compact cassette tape
Frequency response: 50 - 14,000 Hz (Normal tape)
Motor: DC motor with electronic
governor x 1
Signal/noise ratio: 55 dB (TAPE 1, playback)
50 dB (TAPE 2, recording/
playback)
Bias and erasure system: AC
Tape speed: 4.76 cm/sec. (1-7/8 ips.)
Wow and flutter: 0.2 % (DIN 45 511, playback)
(Except for UK)
Wow and flutter: 0.15 % (WRMS)
(For UK)
Heads: TAPE-1: Playback x 1
TAPE-2: Record/Playback x 1
Erase x 1
Front speaker section
Type: 2-way [13 cm (5-1/4") woofer
and 5 cm (2") tweeter]
Maximum input power: 60 W
Rated input power: 30 W
Impedance: 6 ohms
Dimensions: Width; 220 mm (8-11/16")
Height; 300 mm (11-13/16")
Depth; 217 mm (8-9/16")
Weight: 2.6 kg (5.7 lbs.)/each
Surround speaker section
Type: 10 cm (4") full range speaker
Maximum input power: 20 W
Rated input power: 10 W
Impedance: 16 ohms
Dimensions: Width; 170 mm (6-3/4")
Height; 170 mm (6-3/4")
Depth; 88 mm (3-1/2")
Weight: 0.4 kg (0.9 lbs.)/each
CP-C621H
GBOXS0025AWM1
General
Power source: AC 230 V, 50 Hz
Power consumption: Stand-by; 0.6 W
Power on; 89 W
Dimensions: Width; 270 mm (10-5/8")
Height; 300 mm (11-13/16")
Depth; 351 mm (13-13/16")
Weight: 6.2 kg (13.7 lbs.)
Amplifier section
Output power: PMPO; 576 W
(Except for UK) MPO; 144 W (72 W + 72 W)
(DIN 45 324)
RMS; 80 W (40 W + 40 W)
(DIN 45 324)
RMS; 66 W (33 W + 33 W)
(DIN 45 500)
Output power: RMS; 80 W (40 W + 40 W)
(For UK) (10 % T.H.D.)
RMS; 66 W (33 W + 33 W)
(0.9 % T.H.D.)
Input terminal: Video/Auxiliary (audio signal);
500 mV/47 kohms
Output terminals: Front speakers; 6 ohms
Surround Speakers; 16 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
Compact disc player section
Type: 3-disc multi-play compact disc
player
Signal readout: Non-contact, 3-beam semi-
conductor laser pickup
D/A Converter: 1-bit D/A converter
Frequency response: 20 - 20,000 Hz
Dynamic range: 90 dB (1 kHz)
Tuner section
Frequency range: FM; 87.5 - 108 MHz
AM; 522 - 1,620 kHz
Specifications for this model are subject to change without
prior notice.
SPECIFICATIONS
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
CD-C621H

CD-C621H
– 38 –
TROUBLESHOOTING (CD SECTION)
When the CD does not function
When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean
theobjectivelens,andchecktheplaybackoperation.Whenthissectiondoesnotoperateevenaftertheabovestepistaken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC (Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup
lens. Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
Dust gradually accumulates on the objective lens during use, and it may degrade performance.
To avoid this problem, use a cleaning disc designed for CD optical pickup lenses.
HOW TO USE
1. Using the brush in the cleaner cap, apply 1 or 2 drops of the cleaning fluid to the brush on the CD cleaner disc which has
the mark next to it.
2. Place the CD cleaner disc onto the CD disc tray with the brush side down, then press the play button.
3.Youwillhearmusicforabout20secondsandtheCDplayerwillautomaticallystop.Ifitcontinuestoturn,pressthestopbutton.
CAUTION
TheCDlenscleanershouldbeeffectivefor30-50operations,howeverifthebrushesbecomewornoutearlierthenplease
replace the cleaner disc.
If the CD cleaner brushes become very wet then wipe off any excess fluid with a soft cloth.
Do not drink the cleaner fluid or allow it to come in contact with the eyes. in the event of this happening then drink and / or
rinse with clean water and seek medical advice.
The CD cleaner disc must not be used on car CD player or on computer CD ROM drives.
All rights reserved. Unauthorized duplicating, broadcasting and renting product is prohibited by law.
Cleaning Disc
PARTS CODE:
UDSKA0004AFZZ
Cleaner Liquid
Figure 38

– 39 –
CD-C621H
•When the turntable fails to stop.
Is from 5 V till 2.5V down pulse (approx. 300 ms) Check the SWM3 and the wiring from the IC701 pin 21 to the
SWM3.
No
No
input into the IC701 pin 21 when the turntable is rotating?
5V
2.5V
0V
Yes
Check IC2 pin26 Q91 and Q93 and the periphery.
Check the MECHA UP SW and the wiring from the IC701 pin
21 to the MECHA UP SW.
No
Yes
Is there following voltage input on the IC701 pin 21 in the
specific state?
When the CD mechanism is moved up: 0V
In other states: 4.3V
Yes
Is there following voltage input on the IC701 pin 21 in the
specific state?
In other states: 4.3V
When the CD mechanism is moved up: 0V
• When turntable fails to move.
Check the MECHA UP SW and the wiring from the IC701 pin
21 to the MECHA UP SW.
Is 4V output from the Q91 emitter during operation stated
above?
Yes
Yes
Check the wiring of IC2 pin 26 and Q93 pin 2.
OK
No
No
Is L output from the IC2 pin 26 during SEC when the disc skip
switch is pressed?
Yes
Check turntable motor and turntable mechanism.
Check Q91, Q93 and the periphery.
IC701 defective.
IC2 defective.

CD-C621H
– 40 –
• When the CD tray fails to open or close.
Is there following voltage input in specific state of IC701 pin 19?
Open state: 0V
Close state: 0V
Intermediate state between open state and close state: 4.3V
Is H output to IC2 pin 24 or 25 for 7 seconds when the OPEN/
CLOSE key is pressed?IC91 is defective. Replace it.
Is 4V output between IC91 pins 3 and 7 during operation
stated above?
Check the loading motor (M1) and the loading mechanism.
Yes
Yes
Yes
No
No
IC2 defective.
No Check the periphery of IC91.
IC91 defective.
OK
OK
Check the OPEN CLOSE SW and the wiring from the IC701
pin 19 to the OPEN CLOSE SW.
Check the wiring of the IC2 pins 24 and 25, IC91 pins 1 and 3.
• The CD function will not work.
The CD operating keys don't work.
Check the CD, DSP, power supply, and 16.93 MHz clock, and
reset terminal.
Check the waveform of SCK, SO (DATA) and SI (COMM).
Yes
Yes
See if the pick-up is in the pick-up in PICKUP IN SW position.
If the items mentioned above are OK, check the main
microcomputer IC701.
Yes
Yes
No
Yes
No
• The CD operating keys work.
Check the Focus - HF system.
Playback can be performed without a disc.
Focus search OK
Does the pick-up move up and down twice?
Does the output waveform of IC1(16)(FD) match that shown in
Fig. 40?
Check the IC1(50)(CLK) line, 4MHz.
Check the microcomputer data on pins (51)(CL), (52)(DAT)
and (53)CE.
Check the area around IC5-CNP2.
Yes
Yes
Figure 40
Focus search is
performed two
times when play
operation is done
without disc.
0.5s
0.50 V
IC1 16 FD
2
1
0.5s
0.50 V
IC1 7 TE

– 41 –
CD-C621H
• Playback can only be performed when a disc is
loaded.
Is HF waveform normal (see the Fig.41-1, 2)?
Check the tracking system.
Is the Focus servo active? (Can you hear it working?) Check the laser diode driver.
Check the area around IC1(16) - (21) (focus servo circuit).
No
Yes
Yes
Yes
Does the DRF signal change from "L" to "H"? No
Yes
If the disc is not turning, the DRF
should not change to "H".
Level is abnormal.
No Yes
Waveform is unstable. Check the spin system.
Yes
Check the periphery of
IC1 pins 41 and 42.
Check the spin system.
Figure 41-2
Figure 41-1
Waveform in case of
normal play-back
HF
1.0V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
3
2
1
4
0.5s
1.00 V
IC1 16 FD
0.5s
10.0 V
IC2 13 CLV+
0.5s
10.0 V
IC1 54 DRF
0.5s
2.00 V
IC1 7 TE
• Check the tracking system.
Check waveform of IC1 pin 7 (TE).
Play is possible in
TEST mode. Although IL is possible,
play is impossible. Check the periphery
of IC 1 pin 14.
Normal jump is impeded,
and the program top
cannot be reached.
Check the periphery of IC 1
pin 8 to pin 15, and IC 5 to
CNP2.
The waveform shown in
Fig.41-3 appears, and no-
disc state appears soon.
Tracking servo is
inoperative.
Yes Yes
Yes
Yes
Yes
Data cannot be read. Check the VCO-PLL system.
Yes
3
4
5ms
1.00 V
IC1 7 TE
5 ms
5.0 V
IC1 54 DRF
Figure 41-3

CD-C621H
– 42 –
• Checking the spin system.
Yes
No
Play operation is performed without disc.
The turntable rotates a little.
The turntable fails to rotate or rotates at high speed.
Yes The spin driver circuit is normal.
Check the periphery of IC1 pins 23 to 27, pin 39, and pin 40, IC2
pin 12 and pin 13, IC5 to CNP3.
Yes
• Checking the VCO-PLL system
Figure 42
Play operation is performed when disc exits.
Yes
Although HF waveform is normal, TOC data cannot be read. Yes Check PDO waveform (Fig. 42).
Abnormal
Check the IC1 pins 43 and 44, IC2 pins 3, 5, 7, 10, and 11.
Stop --> Play
As VCO freque-
ncy is locked at
4.32 M Hz, voltage
of PDO rises and
stabili- zes.
2
3
0.5s
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC2 16 FD
• Although HF waveform is normal and the time
indication is normal, no sound is emitted.
Check IC 2 pin 48 (EFLG).
Check IC2 pins 37, 40.
Check IC 401 and POWER AMP IC 801.
Abnomal
Yes
Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
No

CD-C621H
– 36 –
VOLTAGE
0V
0V
0V
0V
4.8V
4.8V
0V
4.9V
4.9V
2.3V
2.3V
4.0V
0V
0V
0V
0V
4.8V
4.8V
4.8V
0V
0V
0V
0V
4.8V
0V
0V
0V
0V
0V
0V
0V
5.0V
5.0V
5.0V
4.8V
5.0V
4.7V
5.0V
4.8V
4.9V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
40
39
38
37
36
35
34
33
32
31
PIN
NO. NO.
VOLTAGE
IC701
PIN VOLTAGE
0V
4.8V
0V
4.8V
4.8V
–28V
–28V
–28V
–28V
–28V
–28V
0V
0V
4.7V
4.8V
4.7V
0V
4.8V
5.0V
5.0V
5.0V
–28V
–28V
–20V
60
59
58
57
56
55
54
53
52
51
61
74
73
72
71
70
69
68
67
66
65
64
63
62
–25.4V
–20V
–17.4V
–22.7V
–27.3V
–25.3V
–28V
–22.6V
–25.4V
–22.6V
–27.8V
–25.4V
–25.3V
–25.3V
–22.5V
–22.7V
78
77
76
75
79
90
89
88
87
86
85
84
83
82
81
0V
4.7V
0V
3.6V
11.3V
11.3V
4.8V
4.7V
4.7V
4.7V
50
49
48
47
46
45
44
43
42
41
–25.4V
–25.4V
–25.4V
–25.4V
–25.4V
–25.4V
–25.4V
–25.4V
–25.4V
–25.4V
100
99
98
97
96
95
94
93
92
91
80
11.2V
0V
0V
0V
2.5V
3.0V
3.3V
0V
0V
0V
0V
0V
3.3V
3.3V
3.3V
2.5V
2.6V
2.9V
3.3V
0V
0V
3.3V
7.2V
5.0V
7.2V
2.5V
3.3V
3.3V
0V
0V
0V
0V
0V
0V
0V
5.3V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
36
35
34
33
32
31
5.3V
3.3V
3.3V
7.2V
0.1V
41 0.1V
42
40
39
38
37
PIN
NO. VOLTAGE
IC3
0V
0V
0V
0V
0V
0V
0V
0V
0V
2.7V
0.2V
–2.7V
9
8
7
6
5
4
3
2
1
12
11
10
0V
0V
0V
0V
0V
0V
0V
0V
17
16
15
14
13
20
19
18
PIN
NO. VOLTAGE
IC601
0V(0V)
2.6V(0V)
2.6V(0.3V)
2.6V(0V)
5.1V(0V)
0V(0V)
2.6V(0.2V)
0V(0V)
0V(0.3V)
0.1V(0.3V)
0.1V(0.3V)
2.6V(0V)
9
8
7
6
5
4
3
2
1
12
11
10
0V(0V)
2.5V(0V)
5.1V(0V)
0V(0.4V)
0V(0.3V)
0.2V(0.3V)
17
16
15
14
13
18
4.1V(4.1V)
0.2V(0.4V)
0.1V(4.5V)
0V(0V)
0.5V(0.5V)
0V(0V)
23
22
21
20
19
24
PIN
NO. VOLTAGE
ICT21
0.9V
0.8V
0V
0V
0V
0V
0.8V
0.9V
0.8V
0.8V
0.7V
0V
9
8
7
6
5
4
3
2
1
12
11
10
9.8V
0V
0V
9.8V
0V
5.0V
17
16
15
14
13
18
PIN
NO. VOLTAGE
IC703
0V
0V
–30.4V
–30.4V
30.5V
0V
0V
–29.4V
29.4V
–0.1V
–0.1V
–28.0V
9
8
7
6
5
4
3
2
1
12
11
10
0V
–0.1V
0.1V
15
14
13
PIN
NO. VOLTAGE
IC901
5.1V (5.1V)
5V (5V)
2V (2V)
5V (5V)
2V (2V)
0V (0V)
5V (5V)
2.9V (3.5V)
5.1V (5.1V)
0.1V (0.1V)
3.9V (1.2V)
3.9V (1.2V)
9
8
7
6
5
4
3
2
1
12
11
10
1.1V (1.1V)
2.2V (2.2V)
1.1V (1.1V)
2V (2V)
0.2V (0.1V)
2.0V (0.8V)
0V (1.8V)
0.4V (0.8V)
17
16
15
14
13
20
19
18
2.6V (2V)
2.6V (2V)
5.1V (5.1V)
3.6V (3.6V)
21
24
23
22
PIN
NO. VOLTAGE
IC303
0.2V (11.8V)
4.1V (4.1V)
2.6V (2.6V)
0V (0V)
0V (0.5V)
0V (0V)
4.7V (4.7V)
0.5V (0.1V)
0.2V (0.2V)
0V (0V)
5.1V (5.1V)
2.5V (2.5V)
9
8
7
6
5
4
3
2
1
12
11
10
0V (2.5V)
5.1V (5.1V)
0V (0V)
2.5V (0V)
5.1V (5.1V)
0.9V (0.9V)
0.9V (0.9V)
1.9V (1.1V)
17
16
15
14
13
20
19
18
0V (0V)
2.5V (2.5V)
21
22
PIN
NO. VOLTAGE
IC302
0V (0V)
8.5V (0V)
0V (0V)
0V (0V)
2.6V (0V)
2V (1.1V)
0V (0V)
0V (0V)
8
7
6
5
4
3
2
1
PIN
NO. VOLTAGE
FE301
0.1V
0.1V
0.12V
0.1V
0.13V
–11.2V
0.1V
6.2V
8
7
6
5
4
3
2
1
PIN
NO. VOLTAGE
IC562
0.2V
0.2V
0.2V
0.2V
0.2V
–9.8V
0.2V
6.2V
8
7
6
5
4
3
2
1
PIN
NO. VOLTAGE
IC563
0V
2.1V
5.0V
5.0V
4.6V
1.9V
0V
5.0V
0V
2.5V
0V
5.0V
0V
5.0V
0V
0V
2.4V
2.5V
0V
5.0V
1.9V
0V
2.3V
2.3V
0V
4.7V
4.6V
0V
0V
0V
0V
0V
0V
0V
5.0V
0V
0V
0V
0V
0V
0V
5.0V
2.5V
0V
0V
0V
5.0V
4.6V
1.9V
0V
0V
2.1V
0.1V
2.3V
0V
2.5V
0V
2.5V
0V
0V
0V
4.6V
0V
0V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
PIN
NO. VOLTAGE
51
64
63
62
61
60
59
58
57
56
55
54
53
52
IC2
0V (0V)
0.2V (0.3V)
0V (0V)
0V (0V)
0.5V (0.5V)
4.3V (4.3V)
1.3V (1.3V)
0.6V (0.6V)
4.1V (4.1V)
4.0V (4.0V)
0V (0V)
0V (0V)
9
8
7
6
5
4
3
2
1
12
11
10
0V (0V)
8.1V (8.1V)
4.8V (4.8V)
4.1V (4.1V)
0.6V (0.6V)
0V (0V)
2.5V (2.6V)
0.2V (0.3V)
17
16
15
14
13
20
19
18
4.3V (4.3V)
0.5V (0.5V)
0V (0V)
0V (0V)
21
24
23
22
PIN
NO. VOLTAGE
IC101
2.5V
2.4V
2.4V
2.4V
1.6V
0V
2.5V
2.5V
0V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
4.2V
2.2V
1.0V
1.0V
2.5V
5.0V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.3V
2.3V
0V
0V
5.0V
5.0V
0V
0V
5.0V
0V
0V
2.5V
0V
0V
2.4V
4.6V
4.6V
0V
0V
5.0V
2.5V
0V
5.0V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
PIN
NO. VOLTAGE
51
64
63
62
61
60
59
58
57
56
55
54
53
52
IC1
5.0V
0V
5.0V
3
2
1
PIN
NO. VOLTAGE
IC704
11.3V
6.2V
1.2V
3
2
1
PIN
NO. VOLTAGE
Q821
19.6V
1.3V
7.3V
3
2
1
PIN
NO. VOLTAGE
Q822
12V
19.6V
11.3V
3
2
1
PIN
NO. VOLTAGE
Q823
19.6V
0V
12.0V
3
2
1
PIN
NO. VOLTAGE
Q824

– 37 –
CD-C621H
WAVEFORMS OF CD CIRCUIT
3
5ms
0.50 V
IC1 20 F.E
1
5ms
5.0 V
IC1 54 DRF
STOP PLAY
FOCUS SERCH
1
3
5
4
2
6
7
8
9
10
11
3
4
5
6
7
8
9
6
7
8
10
11
12
9
6
7
8
9
12
0.5ms
1.00 V
HF
0.5ms
5.0 V
HFL
0.5ms
5.0 V
TES
1
2
3
CUE
0.5ms
1.00 V
HF
1
2
3
0.5ms
5.0 V
HFL
0.5ms
5.0 V
TES
REVIEW
50ms
10.0 V
JP+
CUE
50ms
10.0 V
JP-
50ms
0.50 V
JP
50ms
1.00 V
TE
0.5ms
10.0 V
JP+
0.5ms
10.0 V
JP-
0.5ms
0.50 V
JP
0.5ms
1.00 V
TE
REVIEW
50ms
10.0 V
JP+
50ms
10.0 V
JP-
50ms
0.50 V
JP
50ms
1.00 V
TE
0.5ms
10.0 V
JP+
0.5ms
10.0 V
JP-
0.5ms
0.50 V
JP
0.5ms
1.00 V
TE
PLAY
20ms
1.00 V
SPO
NORMAL DISC
TN0=01
20ms
2.00 V
CLV+
PLAY
TCD-712 (140mm)
TN0=01
50ms
1.00 V
SPO
50ms
2.00 V
CLV+
PLAY
TCD-712
5s
100mV
SLD
1
0.5s
100mV
SLD
1

CD-C621H
– 20 –
Figure 20 SCHEMATIC DIAGRAM (1/9)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.
L107
2.2mH
R602 1.5K
R604 1.5K
R606 1.5K
R608 1.5K
R605 1.5K
R601 1.5K
C603
4.7/50
R603 1.5K
C605
4.7/50
R607 1.5K
C601
4.7/50
C627
22/25 R625 22K
R639
47K
R615 2.7K
R101
1K
C108 0.001
Q108 2SC3331
R108 47K
R110 4.7K
R109 4.7K
R112
10K
R117
1K C113
330P
R114
10K
Q110
KRC104 M
Q111
KRC104 M
R111
10K
R102
1K
C111
330P
C153
100/16
R155
150
ZD601
MTZJ2.4B
C614 0.22
C612 0.033
R612
15K
R610
10K
C616
47P
C619
0.022 R623
5.6K
C617
10/50
IC601
M62439SP
AUDIO PROCESSOR
10 11
12
13
14
15
16
17
18
19
20
9
8
7
6
5
4
3
2
1
C613
0.22
C611 0.033
C615
0.22
R609
2.2K
R621
10K R613
10K
C621
0.1/50
R611
330
R115
4.7K
R104
2.2K
R106
3.3K
R105
3.3K
R103
2.2K
R113
10K
C109
0.047
Q109
2SA1318
Q106
2SC2389 SE
Q104
2SC2389 SE
Q105
2SC2389 SE
Q103
2SC2389 SE
C102
0.001
C101
0.001
C105
180P
C106
180P
CNP102 CNP101
R172
220K
R171
220K
C114
330P
R118
1K
C112
330P
Q107 2SC3331
R107 47K
C107 0.001
R619
2.2K
R620
2.2K
R616 2.7K
R622
10K
C622
0.1/50 R629
560(1/2W)
R635
330
R636
330
C629
22/25
R628 22K
R617
2.2K
R618
2.2K
R614
10K
C623
0.001
C624
0.001
Q602
2SC3331
Q601
2SC3331
C634
0.0047
C635
0.0047
R646 100K R645
100K
C626
0.001
C625
0.001
Q604
2SC3331
Q603
2SC3331
C115
47/25
C116
47/25
R135
8.2K
C129 470P
C127 0.022
C128 3.3/50
C131
R137 6.8K
C121
1/50
R123 3.9K
C119
560P
C117
0.033
C130
C132
R138 6.8K
R132 33K
R120
56 C120
560P
R126
5.6K
R119
56
C118
0.033
R122
100K
R124 3.9K
C122
1/50
R125
5.6K
R121
100K
R131
33K
7
6
5
4321
2
C156 3.3/50
C154 47/16
C155 3.3/50
R173
5.6K
R169
680
Q113
2SC3331
R174
5.6K
R170
680
R175
1K
Q114
2SC3331
P22 1 - E
TO POWER SECTION
BI601
P27 12 - C
TO CD SERVO PWB
CNP11
1
2
3
2
TAPE1_R
TAPE1_L
A_GND
A_GND
M_GND
ERASE
TAPE2_R2
TAPE2_R1
TAPE2_L1
9.3V
8.6V
9.3V
0V 3.4V
3.4V
0V
0V
0V
0V
0.7V
0V 0.7V
0V
0V
0V
0.7V
0V
0V
0V
0.7V
0V
0V
0V
0
CNS11
+12V
+7V
CD_GND
L-CH
A_GND
R-CH
–
–
+
Hich=T1
+
112K
112K
0
+B
+B
+B
+B
CD_+B
CD_GND
L
A_GND
A_12V
A_GND
M_GND
3
2 1
1 3
2
CNS101 R-CH
L-CH
PLAYBACK HEAD
TAPE1
CNS102
RECORD/
PLAYBACK HEAD
TAPE2
R-CH
L-CH
ERASE
HEAD
FM SIGNAL RECORD SIGNAL
1
6
4
5
3
2 1
6
4
5
3
2
7
6
5
4
3
1
2
1
3
2
3
2
1
7
6
5
4
3
1
2
R134 68K
R
12
13
10
14
TAPE2_L2
PLAYBACK SIGNAL
18
1920
21
222324
R136 8.2K
Q109 ~ Q111: SWITCHING
Q103 ~ Q108: SWITCHING
M
U
L108
2.2mH

– 21 –
CD-C621H
Figure 21 SCHEMATIC DIAGRAM (2/9)
78 9 10 11 12
CNP303
R640 47K
R642
47K
R602 1.5K C604
4.7/50
R604 1.5K C606
4.7/50
R606 1.5K
R608 1.5K C602
4.7/50
C654
4.7/50
C652
47/16
C651
3.3/50
C653 4.7/50
C650 3.3/50
C620
10/50
ZD602
MTZJ2.4B
R641
47K
R653
220K
R655
5.6K
R651
2.2K
R157
220K
L103
100µH
Q121
2SC3331
R153
10K
2
.4B
R630 560
(1/2W)
C628
0.22
C614 0.22
C612 0.033
R612
15K
R610
10K
C616
4.7P
R623
5.6K
IC601
M62439SP
AUDIO PROCESSOR
11
12
13
14
15
16
17
18
19
20
R626 2.2K
R624
330
C618
0.022
C631
390P
C632
390P
R632
22K
R633
22K
R634
22K
R652 220K
R652 2.2K
R654 5.6K
R656 1K
L104
330µH
R168
12
R162
47K
R164 4.7K
C150
0.0039
R167
100K
R166
47K
R160
150
R172
220K
2
W)
R631
22K
R638
220K
R637
220K
JK601
9
8
7
6
5
4
3
2
1
CNP701
R158
220
Q124
2SA1015 GR
Q128
KTC3203 Y
C151
0.027
(ML)
C152
47/25
Q126
KRC104 M
IC101
AN7345K
PLAYBACK AND
RECORD/PLAYBACK AMP.
R141 56
R135
8.2K
C129 470P
R139 560
C141
1/50
C127 0.022
C128 3.3/50
C131 0.001
C146 220/10
R146 10K
C135 0.068
C139 0.0033
R145
10K
R137 6.8K
C121
1/50
3
.
9K
9
P
C145 22/25
C140 0.0033
C130 470P
C142 1/50
R140 560
C132 0.001
R138 6.8K
C134
22/25
R132 33K
2
0
P
R126
5.6K
C136 0.068 R142
56
3
.
9K
C122
1/50
R125
5.6K
R131
33K
C133
22/25
9
8
7
6
5
4
Q122
2SC3331
C156 3.3/50
C154 47/16
R156
220K
R174
5.6K
70
0
R175
1K
2SC3331
C630
0.022
D601
1SS133
D602
1SS133
CNS701
P24 1 - D
TO DISPLAY PWB
P22 1 - E
TO POWER SECTION
7
6
8
4
5
MAIN PWB-A1(1/2)
SP_DET
SP_RLY
+5V
VF2
–VF
VF1
–15V
M_12V
REC_R
+5V
–15V
SPA_SIG
A_GND
M_12V
D_GND
REC/PLAY
T_BIAS
T_T1 T2
S_MUTE
HI_CUT
SP_RLY
SP_DET
SPN_P
VF2
-VP
VF1
DO
CLK
CE
DI
0V
0.7V 0.7V
0V
0V
11.6V
0V
0V
0V
0V
VIDEO
IN
0V
Vcc
ALC GND
ALC
RIPPLE
Nor/CrO2
+
+
–
–
Hich=CHROME
56K
2
K
56K
2
K
0V
–B
–B
+B
DI
A_12V
D_GND
CLK
CE
DO
TUN_L
A_GND
TUN_R
TUN_SM
TUN_SM
–B
+B –B
+B
+B
+B –B
1
2
P28 6 - C
TO TUNER PWB
D
SIGNAL CD SIGNAL
L-CH
R-CH
R154
10K
REC_L
R134 68K
11.7V
0V
11.6V
3
17
15
16
10
9
8
7
6
5
4
3
2
1
10
11
12
13
14
15
16
17
18
19
20
21
22
10 11 12
17
18
1920
21 16 15 14 13
R136 8.2K
MUTING
MUTING
SWITCHING
BIAS
BIAS OSC
CNS303
Q650
2SC3331
Q651
2SC3331

CD-C621H
– 22 –
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.
Figure 22 SCHEMATIC DIAGRAM (3/9)
F832
T500mA
L 250V
D821
1SS133
D820
1SS133
C909
2200/50
R830
680 (2W)
C910
2200/50
C918
47/50
C936
0.1
(ML)
R934
4.7
D904
1SS133
D903
1SS133 D906
1SS133
Q907
2SC3331
Q906 2SC3331
R928 1K
R930
10K
Q904 2SC3331
R936
56K
C938
47/50
R925
0.1(1W)
D833
1SS133
D832
1SS133
C828
0.1
(ML)
C827
0.1
(ML)
C833
0.1
(ML)
Q822
KIA7806P
31
Q821
AN78L05
1
Q824
KIA7812P
3 1
R827
22K
C826
47/25
C829
3300/25
R825
33
R832
22K
C825
22/25
C824 0.047(ML)
IC901
STK4074B
POWER AMP.
Q823
KTD2058 Y
C904
10/50
R912
100(1/4W)
C907
10/50
R916
1K
R917
56K
C916
15P
C915
120P
C917
47/50
R918
680
R921
22K
R922
680
R923
56K
C924
15P
R924
1K
C923
120P
D803
1N4004S D806
1N4004S
D805
1N4004S
D804
1N4004S
ZD80
MTZJ
C804
47/50
Q801
KTA1274
R806
22K
123456789
10 11 12 13 14 15
Q905
2SC3331
R931
10K
R929
1K
C921
0.022
R938
56K
R939
56K
C920
0.022
R926
0.1 (1W)
R803
47K
C802
100/35
ZD801
MTZJ6.2A
C803
47/50
R802 10
2
C830
47/25
C821
0.047(ML)
R837
10K C832
0.1(ML)
C831
47/25
2
C911
100/50
C912
100/50
R913
100 (1/4W)
Fusible
R966
22K
C905
220P C902
220P
R903
100K R901
100K
C903
1/50
C901
1/50
R904
68K R902
68K
R905
1K
R907
1K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
2
3
CNP8
R801
12K
NC
NC
A_GND
D_GND
M_12V
–15V
SP_RLY
A_GND
L
R
SP_DET
CD_GND
M_GND
A_12V
+5V
–VF
VF2
VF1
CD_+B
(2Ch)
+
+
–
–
–Vcc –Vcc +Vcc
Ch1
Ch2
Ch1 Ch2 Out Out
+B1
+B2
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
–B
–B
U
AC _
+
CNS806
P25 12 - E
TO DISPLAY PWB
MAIN PWB-A1(2/2)
FM SIGNAL
P20 2 - D, P21 12 - G
TO MAIN SECTION
4
3
2
1
D801
TS6B04GM
Fusible
VOLTAGE
REGULATO
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
C934
0.1
(ML)

– 23 –
CD-C621H
Figure 23 SCHEMATIC DIAGRAM (4/9)
78 9 10 11 12
L970
2.2mH C971
100P
C970
100P
FW801
When Servicing, pay attention as the
area enclosed by this line ( ) is
directly connected with AC main voltage.
C956
100/50
C954
100/50
R945
6.8
C945
0.022
C947
0.022
R943
6.8
C941
0.022
C943
0.022
R950
6.8
C944
0.022
C946
0.022
R944
6.8
C940
0.022
C942
0.022
C953
0.001 C952 0.001
C950
0.001
C951
0.001
Q908
KRC107 M
C937
0.1
(ML)
C936
0.1
(ML)
D802 1SS133
JK970
HEADPHONES
CNP802
R946
330(1/2W)
R937
4.7
R934
4.7
R961
15K
D960
1SS133
C960
10/50
R963
1K
Q906 2SC3331
RL901
R936
56K
C938
47/50
WTM801
D810
1N4004S D813
1N4004S
D812
1N4004S
D811
1N4004S
C809
0.047(ML)
C924
15P
1K
9
23
2
0P
C813
100/50
C806
0.22 C805
0.22
D803
1N4004S D806
1N4004S
D805
1N4004S
D804
1N4004S
ZD802
MTZJ30B
C804
47/50
Q801
KTA1274 Y
R806
2.2K
D807 1N4004S
D808
1N4004S
D809
1N4004S
C812 100/50
C811 220/50
RL801
C961
47/50
CNP804
R960
150
R967
150
14 15
D907
1SS133
R938
56K
R939
56K
R949
330(1/2W)
R941
4.7K
R942
4.7K
R952
68
C962
270P
D961
1SS133
D962
1SS133
R951
68
Q960
2SC3331
1
2
3
4
5
6
7
8
R803
47K
C802
100/35
ZD801
MTZJ6.2A
C803
47/50
R802 10
1
2
CNP801
T802
C801
0.0047
MM901
FAN MOTOR
1
2
T801
POWER TRANSFORMER
C810
470/35
Q803
AN78L05
1
D816
1SS133
2
3
C814
10/16
R808
220
C815
1000/6.3 D815
1SS133
D818
1SS133
Q802
KRC107 M
CNP806
R962
68K
R801
12K SO801
AC INPUT
F802
T4A L 250V
F803
T4A L 250V
1
2
3
B
2
16 OHMS/CH
6 OHMS/CH
+B +B
+B
+B
+B
+B
+B
CNS804
1
5
SP_REAR_L-CH
SP_REAR_R-CH
SP_REAR_L-CH_GND
SP_REAR_R-CH_GND
SP_L-CH
SP_R-CH
SP_L-CH_GND
SP_R-CH_GND
CNS801
T.F
F805
T2A L 250V
–B
B
POWER TRANSFORMER
3
2 1
D_GND
UN_SW_5V
AC _RLY_CON
+5V
+B
CNS806
P25 12 - E
TO DISPLAY PWB
+B
AC POWER
SUPPLY CORD
AC 230V/50Hz
POWER PWB-A2
HEADPHONES PWB-A5
8
7
6
5
4
3
2
1
8
7
6
5
4
2
1
3
4
3
2
1
5
4
3
2
1
2
11
2
D801
TS6B04GM
CNS802
C808
0.22 C807
0.22
SO901
SPEAKER
TERMINAL
VOLTAGE
REGULATOR
C935
0.1
(ML)
C934
0.1
(ML)
L901
0.29µH
L902
0.29µH
L801
TO TAPE MECHANISM
CHASSIS

CD-C621H
– 24 –
Figure 24 SCHEMATIC DIAGRAM (5/9)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.
M
C720
47/50
R707
1K
R708
1K
Q707
2SC3331
R750
R749 10K
R748
10K
R747
10K
R709
1K
R712 22K
R713 1K
R715 1K
IC701
IX0281AW
SYSTEM CONTR
O
MICROCOMPUTE
R
R737 1K
R736 1K
R734 2.2K
R733 2.2K
R732 1K
R731 1K
R730 1K
C568
2.2/50
Q703
KTA1271 Y
D716
1SS133
R759
10K
D554
1SS133
C566
2.2/50
D555
1SS133
D556
1SS133
LED722
SLI342UCJ
R735 1.8K
R757
10K
R756
10K
R75
5
10K
R753
10K
R754
10K
R752
10K
R714 1K
R701
1K
R702 1K
R703 1K
R705
1K
R741 1K
R740 1K
R739 10K
R738 1K
C705
47/25
Q702
KTA1273 Y
R760
10K
ZD551
MTZJ6.2C
C569 0.022
C563 0.022
R574
330
R575
330
R758
1.2K
R727 10K
R724 10K
R726 10K
FL701
FL DISPLAY
R723
100K
R722
100K
R721
100K
L
E
L
E
R720
10K
R719
10K
R717
10K
C557
270P
R558
68K
C553
0.0027
R562
390K
R556
33K
IC563
OPE AMP.
KIA4558P
R551
10K
C562
0.022
R572
2.2M
R555
56K C555
0.0068
IC562
KIA4558P
OPE AMP.
R561
15K
C561
0.022
R560
470K
C551
270P
R567 270K
C556
0.0068
R573
560K
R564 390K
C559
0.0027
R553
12K
R568
220K
R570
220K
D551
1SS133
R566 2.2M
R580 100K
R579
100K
C567
2.2/50
R578
100K
CNS701
R716
33
R706
1K
Q706
2SC3331
Q705
2SC3331
1 2 3 4 5 6 7 8 9
DISPLAY PWB-A3
CNP701
TO MAIN PWB
C702
1/50
BI701
4
1
8
7
2
3
5
6
4
1
8
2
3
5
6 7
NC DISTOUT
SPN_P
SP_DET
SPRLY
DIST0
DIST0 L:DEMOSTART
DIST0 H:ECOSTART
REC/PLAY
AC RLY-CON
5V
–15V
SPA SIG
A_GND
TUN_SM
12V M
D_GND
REC/PLAY
T_BIAS
T_T1 T2
S.MUTE
HI_CUT
SP_RLY
SP_DET
SPN_P
VLOAD (–VP)
VF2
VF1
DO
CLK
CE
DI
12V
12V
12V
12V
0V
0V
U/D SW
VDD
G5
G6 G7 G8 G9
P1
P10 P11
P2 P3 P4 P5 P6 P7 P8
VLOAD
P16
HI-CUT
S MUTE
T_T1T2
T-BIAS
FPA TIFAS CAM SW VDD T_MOT
T_SOL
TIMER LED DNO SW
VSS REMOCON SYS STOP O/C SW PUIN SW
T2 RUN
P15
P14
P13
P12
P21/DIST3
P22/DIST4
P20/DIST2
P19/DIST1
P18
P17
P11 P10
P9
C
C
C
C
8
7
65
4
123
GND
CAM SW T1FAS FPA
MOTOR
+12V
T2 RUN SOLENOID
F F F
G11 G10 P01 P02 P03 P04
G05
G06 G07 G08 G09
P05 P06 P07 P08 P09 P10 P11
P12 P13 P14 P15 P16 P17 P18 P19 P20 P21 P22
SPEANA3
SPEANA2
2
–
MM1
TAPE MOTOR
2+
4
13
FWM1
SWM3
F.P.
CNPM2
SWM4
F.A.S
SOLM1
SOLENOID
SWM5
CAM FWM2
CNPM1
CNSM1
PHM1
RUN PALS
SENSOR
+B
–B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
SPEANA1
–B
–B
–B
+B
MOTOR
T2 RUN
+12V
FPA
CAM SW
T1 RUN
SOLENOID
GND
TAPE MECHANISM
PWB-F
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
3
10
11
12
13
14
15
16
17
18
19
20
21
22
10
11
12
10
11
12
3
36
3738394041424344454647484950
9
95
9493929190898887868584838281
80
80
79
78
77
76
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
52
51
1
30
+B
+B
+B
+B
+B
P21 12 - F

– 25 –
CD-C621H
Figure 25 SCHEMATIC DIAGRAM (6/9)
78 9 10 11 12
R761 1K
D723
1SS133
R795 4.7K
C723 0.1/50
C710
220/10
R711
4.7K
R751 3.3K
R750 10K
R749 10K
R748
10K
IC701
X0281AW
EM CONTROL
R
OCOMPUTER
R774 1K
R771 1K
R775 1K
R770
1K
R769 1K
XL701
4.19 MHz
R737 1K
R736
1K
R768 1K
R767 1K
R766 1K
R765 1K
R764 1K
R763 1K
R762 1K
R772
1K
R778 1K
R777 1K
R776 1K
Q704
KRC102 M
C713
0.022
D718
1SS133
R797 100K
C712
3.3/50
L702
100µH
D717 1SS133
C711
0.01
R745
1K
C709
0.022
R757
10K
R756
10K
R755
10K
R753
10K
R
754
0K
2
R741 1K
R740 1K
R739 10K
R738 1K
D721
1SS133
D722 1SS133
D720
1SS133
C714 0.022
D719
1SS133
C715 47/25
R780
10K
R742 1K
R744
1K
R743 1K
RS711
1.5K
RS703 470
RS702 470 RS701 470
RS704 470 RS705 470
RD05
2.2K RD06 3.3K RD07 3.9K RD09 6.8K
R787 1K
LED716 SLI342YCJ R786 1K
LED717 SLI342YCJ
RD02
1.2K
RD01
820
RD03
1.5K
RD04
1.8K
IC703
BU2092F
INPUT/OUTPUT EXPANDER
C718 47/25
C719 0.022
RS712 1.2K
C706
1/50
C722 10/50
RD10
820 SW711 RD12 1.5K
SW712 RD14
2.2K
SW714
RD13
1.8K
SW713 RD15
3.3K
RD11
1.2K SW716 SW717 SW718 SW719 SW720 SW721
RD16
3.9K RD17 6.8K RD18 12K RD19 22K RD20 68K
SW715
SW710
RD22
1.2K RD24 1.8K RD25 2.2K
SW726SW725
RD23
1.5K SW730
SW727 RD28
6.8K
RD21
820
SW722 RD26
3.3K
SW724 RD27
3.9K
SW728 SW729
SW723
BI702
BI703
P27 7 - G
TO CD SERVO PWB
CNP12
CNP806
P23 7 - G
TO POWER PWB
2 31
RX701 R798
100
2
31
IC704
KIA7042AP
RESET
SWITCH PWB-A4
1 2 3 4 5 6 7 8 9
RS706 470
RS707 470
SW708 SW709
SW707
SW706SW705
FW702
SW704
SW703
SW701
0
L:DEMOSTART
0
H:ECOSTART
A
Y
CON
5V BACK UP
CD PTY/TI
SEARCH
TAPEVIDEO
MEMORY/
SET
REC
PAUSE
U/D
SW
VDD
G1 G2 G3 G4 G5 G6 G7 G8 G9
P1
P10 P11
DNO SW
VSS REMOCON SYS STOP O/C SW PUIN SW
T2 RUN
SPEANA1
SPEANA2
SPEANA3
AVSS
SLD–
SLD+
FRF(DRF)
SQOUT
PCCL
VPP
LCK1
CLK
DO
CD DSP RES
CD DSP WRQ
CD DSP RWC
CD DSP COIN
CD DSP CQCK
RESET
AVDD
X2
X1
VDD
CE
DI
F F F
G11 G10
P01
G05 G06 G07 G08 G09 G01 G02 G03 G04
CNS806
D_GND
UN_SW 5V
AC_RLY CON
+5V
KEYIN1 KEYIN2
KEYIN3
Q10
VDD
Q11
Q6 Q5
Q4
Q3 Q2
Q1
Q0 LCK CLOCK DATA
VSS
TUNER/
BAND
PCCL
CQ CK(DSP)
CO IN(DSP)
SQ OUT(DSP)
SLD+
RES(DSP)
WRQ(DSP)
RWC(DSP)
DISC NO
OPEN/CLOSE
D_GND
PUIN SW
SLD–
UP/DOWN
DRF(ASP)
TUNING
UP
TUNING
DOWN
REMOTE
SENSOR
1
2 3
+B
+B +B
+B
OE
Q9 Q7 Q8
+B
+B
+B
+B
DISC
SKIP OPEN
/CLOSE
DISC3DISC2
DISC1
+B
+B+B
11
88
POWER
SW702
STATION TIMER/
SLEEP
+B
+B
VOLUME
UP
VOLUME
DOWN X-BASS/ DEMO EQUAL
IZER
PLAY
FF
REV
STOP
CNS12
C707
15P
C708
18P
9
8
1
7
3
5
4
6
2 1
6
9
4
2
5
3
8
7
4
3
2
11
2
3
4
LED702 SLI342YCB LED703 SLI342DCB
LED701
L1154GT4
LED704 SLI342UCB
LED705
SLI342DCB
NIGHT RIDER 1 NIGHT RIDER 2 NIGHT RIDER 3
NIGHT RIDER 4 NIGHT RIDER 5
LED706
SLI342YCB
LED707
L1154GT4
NIGHT RIDER 6 NIGHT RIDER 7
STOP
PLAY
2
52627282930313233343536 373839
10
11
12
13
14
15
10
11
12
13
14
15
101112131415161718
DIMMER
CLOCK
3132
33343536
3738394041
4
2
100 99
98979695
9493929190
8
9
1
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
26
27
28
29
30
30
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
EON ASPM
DISPLAY
MODE

CD-C621H
– 26 –
Figure 26 SCHEMATIC DIAGRAM (7/9)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.
D1
1SS133
C77
100/16
R36
220K
C57
0.001
R1
22
R35
220K
C21
0.0033
C20
47/16
C82
100/16
C55
100/16
R56
22K
C36
100/16
IC3
M63001FP
FOCUS/TRACKING/SPIN
/SLED DRIVER
C37
0.022
R47
10K
C25
27P R39
1K
C15
0.01
R41
47K
R43
56K
R44
33K
R42
47K
R28
10K
R29
56K
C17
0.001
R30
6.8K
R19
1K
C3
1/50
R34
1K
R11
6.8K
C6
0.033
R10
2.2K C5
0.033
C54
0.001
R8
15K
R9
100K
C16
0.0047
R27
39K
R25
1.5K
R23
10K
R24
47K
R17
33K
C29
4.7/50
C28
0.1
C14
0.01
C4
0.1/50
C35
1/50
Q1
2SA1318
R18
15K
C11
0.1
IC1
LA9241M
SERVO AMP.
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
16
15
14
13
12
11
1
0
9
8
7
6
5
4
3
2
1
C13
330P
R26
82K
R37
82K
C19
1/50
R33
1.2K R32
10K
C32
0.01
C31
220/6.3
C30
0.1/50
C27
0.001
C24
2.2P
R40
5.6K
C26
0.033
R31
1.2K
C18
0.47/50
R16
3.3K
C10
180P
C8
0.068
C7
0.1/50
R12
100
C9
0.047
R13
1K
R14
27K
C12
0.1
R2
1K C1
47/16
C2
0.01
R46
560
R38
470
C23
0.0027
R45
4.7K
C22
220P
R22
820
R21
1.5K
C34
0.33/50
C33
0.47/50
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
R15
12K
CNP1
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
19
20
21
42
41
40
39
38
37
C76
0.022
CNP12
CNP2
CNS12
P25 12 - B
TO DISPLAY PWB
CNP3
6
5
4
3
2
1
2
3
4
5
1
CNS1A
CNS1B
2
3
4
5
1
CNS2B CNS2A
6
5
4
3
2
6
5
4
3
2
1
CNS3B
1
CNS3A
6
5
4
3
2
1
CNP3A
2
3
4
5
1
PICKUP UNIT
CD MOTOR PWB-D
M
M2
SLED
MOTOR
M
M1
SPINDLE
MOTOR
SW4
PICKUP
IN
SL_+
SL_–
CD_PUIN
SP+
SP–
(SPN)VCC2
VCC4
LD_M+
LD_M–
VCC3
M–
M+
SOL+
SOL–
SP–
SP+
SPO
SOL–
SOLD
MUTE
Vref
STANDBY
VCC1
SLD
SL–
SL+
GNDGND
TR+
TR–
FO–
FO+
FO (GAIN)
FD
TO
GND
HF
TP1
TE
NC
NC
TBC
JPCLO
SLOF
SLOF
SLOF
FSC
FE1
FOSTA
FSC
EFBAL
REF
JP
REF
REF
CV+
CV–
JP–
JP+
2FREQ
LASER
8/12CM
FSTA
S.Q.R
FOSTA
TOSTA
LATOH
FSTA
SLOF
CL
CE
DRF
HFL
DEF
VCC
THD
GL
THDL
TGL1
VCR
VCR
VCR
VCR
FE1
REF
REF
RF
REF
DGND
SLI
FIN2
FIN1
EREF
F
TB
TE–
TE
TESI
SCI
REF
REF
REF
REF REF
REF
REF
REF
REF
REF
TO
REF
JP
REF
TH
TD
TD–
JP
TO
FD
GEN
GEN
GEN
FD–
FA–
FA FE
FE–
AGND
SP
SPI
SPG
SP–
SPO
SLEO SLD
SL– SL+
REF
REF
REF
REF
OR
REF
RF
SLC
RFS–
RFSM
JP–
JP+
TGL
TOFF
TES
HFL
SLOF
CV–
CV+
–
+
–
+
–
+
RES(DSP) WRQ(DSP) RWC(DSP) CQ CK(DSP) CO IN(DSP) SQ OUT(DSP) DRF(ASP) D_GND SLD+ SLD–
VCC1
DEF
CLK
DAT
CL
CE
DRFFSS
VCC2
REF1
VR
LF2
PHI
LDO
BHI
LDS
K
A
B
E
F
PD
TR–
TR+
FO+
FO–
LD
PUIN SW
O
P
+B
+B
+B
+B +B
+B
+B
+B
VREF
+B
F
B
A
E
K
TR–
TR+
FO+
FO–
GND
PD
VR
LD
CD_GND
LD
K
E
B
LD GND
A
F
C
LT0H30M1
TR–
TR+
FO+
FO–
GND
PD
VR
LD
MON
TR+
FO+
FO–
ACTUATOR
TR–
F
B
A
E
K
+
–
+
–
1
12
11
10
9
8
7
65
4
3
21
5
4
3
2
1
8
7
6
5
4
3
2
1
8
4
1
8
1
7
2
3
7
3
4
6 6
5
5
2
1
8
3
7
4
6
5
2
R20
1K
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
2
3
4
5
6
7
10
1
8
9

– 27 –
CD-C621H
Figure 27 SCHEMATIC DIAGRAM (8/9)
78 9 10 11 12
• The numbers 1 to 12 are waveform numbers shown in page 37.
R84
2.2K
D1
1SS133
IC2
LC78622NE
SERVO/SIGNAL
CONTROL
R55
100
C57
0.001
R65
1K
D82
1SS133
C83
0.022
R80
820
R81
820
Q51
KRC102 M
D92
1SS133
D93
1SS133
R83
390
R82
390
C56
0.022
D91
1SS133
Q52
KTC3203 Y
C52
100/16
R64
22
R66
220
ZD61
MTZJ5.6B
C51
100/16
C50
0.022
L61
0.82µH
C37
0.022
R47
10K
C46 100P (CH)
R
39
K
R44
33K
R42
47K
R51
3.3M
8
1
D81
1SS133
C45
100P(CH)
C44
100P(CH)
R50
680
C39
0.047
C40
0.047
R52
27K
R60
1K
C38
0.01
C49
100P(CH)
C48
100P
C43
330/6.3
R53
1.2K
C
23
0
027
C22
220P
C47
100P(CH)
C71
10/50
C72
10/50
R71
2.7K
R72
2.7K
1
2
3
4
5
6
7
8
9
10
CNP10
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
44
43
42
41
40
39
38
37
36
35
34
33
48
47
45
46
64 63 61
62 60 59 58 57 56 55 54 53 52 51 50 49
CNP11
C75
0.001
X1
16.934MHz
R93
220
C73
220P
C74
220P
R73
100K
R74
100K CNS11
TO MAIN PWB
CD SERVO PWB-B
1 1
2
3
4
5
6
7
8
9
10
2
3
4
5
6
1 1
2 2
SOLM2
SOLENOID
M
M3
T/T
UP/DOWN
LOADING
SW1
OPEN
CLOSE
SENSOR PWB-E
SW2
MECHA UP
SW3
DISC NUMBER
CNS12
P25 12 - B
TO DISPLAY PWB
CD SIGNAL
M–
M+
CD_D_NO
R88 1.2K
R89 1.2K
R90 220
R91 1K
+5V
NC
NC
TEST5
/CS
TA1
2KX8
RAM
1BIT
@
DAC
SERVO
COMMAND
TES
HLF
V/P
CLV_
CLV+
TEST2
EFMIN
EFMO
VSS
FR
VVDD
ISET
VVSS
PDO
DEF1
TOFF
TGL JP+ JP_ PCK
FSEQ
VDD
CONT1 CONT2 CONT3 CONT4 CONT5
EMPH
C2F
CLV
DIGITAL
SERVO
OUTPUT
EXTERNAL
SYNC-DETECT
EFM DEMODULATE
SLICE
LEVEL
CONTROL
VCO CLOCK
OSC CONTROL
ERROR COERECT
FLAG CONTROL
DIGITAL
OUT
TEST3 DOUT
4FS
DIGITAL
FILTER
TEST1
TEST4
MUTEL
LVDD
LCHO
LVSS
RVSS
RCHO
RVDD
MUTER
XVDD
XOUT
XIN
XVSS
SBSY
EFLG
SUB-CODE
µ-COM
INTERFACE
TEST11
SBCK
SFSY
PW
FSX
WRQ
RWC
SQOUT
COIN
/CQCK
/RES
16M
4M
X-TAL
GENERATOR
RES(DSP) WRQ(DSP) RWC(DSP) CQ CK(DSP) CO IN(DSP) SQ OUT(DSP) DRF(ASP) D_GND SLD+ SLD–
PCCL
UP/DOWN
DISC NO.
NC
NC
NC
NC
NC NC
NC
NC
NC
NC NC NC NC
CD_LCH
A_GND
CD_RCH
+B
R57 1K
R58 1K
R59 1K
R61 1K
R62 1K
R63 1K
+B
L-CH
A_GND
R-CH
D-GND
+7V
+12V
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
SOL+
SOL–
M+
M–
GND(D)
DISC NO.
GND(D)
MECHA UP
GND(D)
LOCK
DISC NO
+
–
CNS10
BIM05
CNS5
OPEN CLOSE
1
2 3
PUIN SW
OP/CLOS
B
15
14
1312
11
10
9
8
7
65
4
3
21
6
5
4
3
2
1 P20 1 - B
11

CD-C621H
– 28 –
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.
Figure 28 SCHEMATIC DIAGRAM (9/9)
CNS303
P21 12 - D
TO MAIN PWB
C369
27P
C350 0.022
RT48 390
C352 10/16
R351
5.6K C351 0.022
R347
6.8K
R346 330
FE301
FM FRONTEND
VR351 10K(B)
R356
1K C368
1/50
R357
470K
C374
0.015
C367 1/50
R350 2.7K
C365 0.022
C366 0.001
C364 10/16
C363 0.022
C343
33P
C361 0.022
C362
3.3/50
R358
8.2K
L353 1mH
C334 27P (UJ)
R323
68K
C323 0.022
C373 0.015
R361 1.2K
C371 1/50
IC303
LA1832
FM IF DET./
FM MPX./AM IF
T302
C331 0.047
C332 0.022
VD301
SVC348S
C380 10/16
C387
0.022
C392 0.001
R382 150
C337
0.022
C375 3.3/50
R392 390
R391 390
R383 5.6K R365 10K
R366 10K
R368 33K
R367 1K
ZDT21
DZ5.1BSB
CT43
10/16
D353
DS1SS133
C384 0.001
C394 47/16
C397 0.022
C301 0.001
D304 DS1SS133
D303
DS1SS133
D302 DS1SS133
D301 DS1SS133
C338 0.001
L341
C341
0.022
L342
2.2mH
R364
47K
C344 33P
R369
15
R348
680
R349
33
Q301 2SC380-O
R336
10K
C335
560P
CT36
0.022
R370
1K
R371
1K
R374 1K
R372 1K
R373 1K
Q371 KTA1266 GR
D352 DS1SS133
R384
5.6K
R360
4.7K
R387 22K
ZD352 DZ3.9BSB
R376 1K
D351 DS1SS133
C391 47/16
R385 5.6K
Q360
KTA1266 GR
Q361 KRC107 M
R359
1.8K
CT27 22P (CH)
RT35
220K
RT36
220K
RT37
220K
R355 3.3K
C357 2.2/50
C358 1/50
C381 12P(CH)
C382 15P(CH)
C393 1/50
C386 330P
R378
82K
L351 100µH
L352 100µH
R354 3.9K
C356 0.001
RT49 390
R363
47K
XT21
4.332 MHz
CT26
22P
R398
1.2K
IC302
LC72131
PLL(TUNER)
CF302
C321 100/16
RT26
1K
RT30 1K
RT29 1K
RT28 1K
LT22 2.2µH
CT28 47/10
CT29 0.022
RT21
100K
CT24
0.022
R301 330
T351
CF352
R352
1K
R344 470
R345 4.7K
C347 0.022
C346 0.022
CF301
C345 0.022
R393 1K
C395 0.022
C396 100/10
ZD351
DZ5.1BSB
R395
47K
SO301
ANTENNA
TERMINAL
FM
75 ohms
R381 10K
R380 1.5K
C372 1/50 R362
1.2K
C399
0.022
C398
100/10
C353
0.022
CF351
C354 0.022
C370
1/50
C355 22P
ICT21
LC72720
RDS DECORDER
CT23
10/16
R353
270
Q354 KTC3199 GR
Q353 KTC3199 GR
C385 0.01
X352
4.5MHz
R379
2.2K
SM
SD
TUN_MUTE
TP
D GND
CLK
DO
TP TP
VDDA
XIN
VDDD
CE
CE
DI
MO/ST
ST IND
MO/ST
B01
A+12V
A GND
L
R
SYR
CL
DO
DI
VSSD
XOUT
T2
T1
CIN
MPXIN
VSSA
FLOUT
VREF
F OUT
IF OUT
VCC
VT
GND
GND
GND
ANT
VSS
AOUT
AIN
PD
VDD
AM IN
DO
CL
DI
CE
X IN
IF IN
REG
AM IF IN
GND
SD
STEREO
FM DET
VCC
IF OUT
PHASE
(FM/AM)
PHASE
L-CH OUT
R-CH OUT
MPX IN
FM/AM OUT
VSM
AM LOW CUT
AM RF IN
AM OSC IN
FM AFC
AM OSC OUT
AM MIX OUT
FM IF IN
2 1 2
1
CNP301
9
8
7
6
5
4321
9
8
7
6
5
4321
10 11 12
9
8
7
6
5
4321
8 7 6 5 4 3 2 1
10
9
8
7
6
5
4 3 2 1
LT21
2.2µH
CT21 47/10
CT22
0.022
CT25
560P
QT21 KTC3199 GR
RT32 10K
RT33
56K
RT34
56K
CT37
0.022
R377
47K
MW LOOP
ANTENNA
BALUN
C330 15P (CH)
T306
MW OSC.
MW ANT. FM MUTE
LEVEL
C342 0.022
1
2
3 1
2
3
AM IF
L354
LOW PASS
FILTER
X351
456KHz
MPX VCO
TP302
CNP303
1
2 3
1
2
3
TUNER PWB-C FM SIGNAL
MW SIGNAL
RDS-ID
T6
T7
SYNC
T3
T4
T5
131415
16
17
181920
21222324
1011 12
13141517 1618192021222324
X OUT
FM IN
10 11
121314151617
20
21
22 1819
R375
68

– 29 –
CD-C621H
78 9 10 11 12
Figure 29 WIRING SIDE OF P.W.BOARD (1/7)
C338
C323
C346
R369
R346
R347
R348
C347
C345
R301
R345 R380
R379 R381
C397
R344
C341
C330
C337 C332
C392
C334
R323
C343
R358
C363 C361 C344
C350
C351
R351
C366
R352
C399
R353
C342
C354
C356
C353
R364
R363
R362
R365
R361
R366
CT37
R356
R355
R359
CT25
CT24
CT22 CT29
RT28
RT30
R370
R367
C355
C395
R384
R385
R383
R387
C384
R376
C385
C386
R360
R371 R372 R374
R373
C301
C382
C387
C381
R378
123
123
C374
CNP303
IC302
D303
D304
D302
D301
CNP301
T302
VD301
R336
C362 L353
C367
R350
L354
T351
C369
C368
R357
Q354
C372
C371
C373
CT43
ZDT21
CT36
RT34
RT33
RT32
CT21
LT21
CT23
CT26
C375
QT21
X351
RT35
RT36
RT37
CT27
XT21
LT22
RT48
RT49
ICT21
RT21
ZD351 C396
R392
R391
Q361
C391
R395
L352
C370
Q371
R377
B
C
E
R398
Q360
ZD352 L351
C393 C380
C394 X352
R382 D352
D351
RT29
RT26
CT28
C364
C365
IC303
FE301
C321
R349
L342
L341
Q301
C331
T306
C335
VR351
C352
C398
CF352
1
2
3
4
5
6
7
8
9
10
11
12
14
13
16
15
18
17
20
19
22
21
24
23
R354
C358
C357
R393
D353
R368
Q353
CF351
CF302
CF301
1
2
3
9
8
7
6
5
4
10
11
12 13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
22
12
1
2
3
4
5
6
7
8
9
10
TO MAIN PWB
CNS303
3
2
1
MW LOOP
ANTENNA SO301
ANTENNA
TERMINAL FM
75 Ohms
2
3
4
5
1
7
8
6
TUNER PWB-C
12
12
FM MUTE
LEVEL
BCE
BCE
B
C
E
1
2
3
P31 9 - A
BCE
E
C
B

CD-C621H
– 30 –
Figure 30 WIRING SIDE OF P.W.BOARD (2/7)
A
B
C
D
E
F
G
H
123456
R907
C630
R633
R631
C631
C632
R632
R634
R619 R625 R626
R640
R617
R618
C624 C623
C625
R628
C634
R614
R622
R905
R620
C626
R616
R615
R621
C635
R624
R604
R642 C616 C619
R610
R612
C618
R638 R637
R605
R603
R641
R639
C904
RL901
R830
D801
C808
C831
C826 C830
C821
Q904
C920
R928
R930
C917
C918
R922
R924
R921
R916
R918
R925
R926
D904
R929
R966
C909
C910
D903
Q905
C921
R931
R913
C911
C915
R917
C916 C924
R923
C923
Q8
2
IC901
R636
C901 C903
R903
1
R904 R901 R902
C905 C902
Q604
R635
R645
Q650
C602
R630
CNP701
BI601
C621 C601
C651
R656
R652
C650
11
23
5
7
9
11
13
15
17
19
21
4
6
8
10
12
14
16
18
20
22
6
Q651
C652
C653
R651
R653R655
R601 R607
C611
C613
C615 ZD601
C617
15 10
111520
R609
R629
C605
R611
C620
ZD602
IC601
R623C654
R650
R654
R613
Q601 Q603
C622
C606
C603
C612
C614 C628
R602
R606
R608
C604
C627
C629
D601
Q602
R646
R960
C960
R962
CNP804
D602
C961
R961
D960
R963
C942
R937
C937
C956
C946
C940
C935
C944
C954
R912
C907
C912
Q907
Q906
C938
R936
R941
R942
R939
R938
R949
R946
D907
R934
R945
C951
R943
C950
C953
C947
L901
L902
R944
R950
C945
R951
C952 C943
C936
R952
C941 Q908
C934
D906
Q960
2 3 4 5 6 78 9
10 11 12 13 14 15
1 2 3 4 5 6
CNS11
RD WH WH WH WH WH
1 2
E C B
E C B
E C B
123
BCE
BCE
E
C
B
BCE
BCE
BCE
ECB
ECB
32
SO901
SPEAKER
TERMINAL
JK601
VIDEO IN
–
–
+
+
–
–
+
+
L-CH
R-CH
L-CH
R-CH
L-CH
R-CH
L-CH
R-CH
FRONT
6 OHMS
MIN.
SURROUND
16 OHMS
MIN.
L-CH
R-CH
FC701
RD CNS804
BR
2
1
M901
FAN MOTOR
1
CNS701
P33 8 - H
TO DISPLAY P
W
CNP11
P35 12 - D
TO CD SERVO PWB
MAIN PWB-A1
BR
COLOR TABLE
RD(R)
OR
YL
GR
BL
VL
GY
WH(W)
BK
PK
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK

– 31 –
CD-C621H
Figure 31 WIRING SIDE OF P.W.BOARD (3/7)
78 9 10 11 12
C101
R107
C108
R104
R105
R103
R136
C130
R132
R122
C120
R124
R126
R140
R146
R134
C107
R117
C139
R137
C127
C102
R101
C111
C129 R135
R121
C119
R123
R125
R131 R139
R141
R171 R169
R173
R154
R153
R172
R145
C113
C112
C114
R142
C131
R108
R109
R110
C106
R115
R166
R168
R167
R113
R114
R162
R164
C140
C132
R907
R616
R118
1 2 3
C803
Q111
Q110
R155
R160
C152
CNP101
C115
C117
L107
Q124
R175
L103
L104
Q128
Q109
C109
C153
C150
C121
CNP102
R112
C105
C151
Q108
Q107
R102
R119
R120
Q105
Q103 Q104
Q106
R156
Q114
R170
Q122
C142
C145
R174
C146
R138
C136
C141
C156
C134
C122
R111
L108
IC101
C116
C133
C128
CNS303
R157
Q121
R158
C154
CNP802
Q113 Q126
WTM801
C135
C155
D803
D805
D804
C805 D806
C806
R801
R803
C802
ZD801
C804
ZD802
C813
C812
C811
R806
Q801
R802
Q823
Q824
D832
Q822
R825
D807
D809
D808
D962
D961
C962
R830
D801
C808
C807
C833
R837
C831
C826 C830
R827
D833
C827
R832
C824
C821
C828
C832
Q904
C920
R928
C917
C918
R922
R924
R921
R916
R918
C909
R917
C916 C924
R923
C923
Q821 C825
D820
0
1
D821
R636
C
901 C903
R903 R904 R901
C905
C902
CNP701
BI601
11
12345678910
1
7654321
12 10
5
13 15 20 24
23
5
7
9
11
13
15
17
19
21
4
6
8
10
12
14
16
18
20
22
6
R106
T500mA L 250V
F802
T4A L 250V
F803
T4A L 250V
F805
T2A L 250V
F832
C118
12345678
9
10 11 12 13 14 15
1
5FW801
C970
L970
C971
5 4 3 2 1
E C B
B
C
E
B
C
E
BCE B
C
E
B
C
E
E
C
B
E
C
B
E
C
B
E
C
B
ECB
ECB
BCE
B
C
E
1
2
31
2
3
1
2
3
E
C
B
1
2
3
1
2
3
B
C
E
321
P34 2 - B
JK970
HEADPHONES
CNS802
TO POWER
TRANSFORMER
CNS102
TO TAPE MECHANISM
TAPE2 HEAD
CNP303
P29 12 - F
TO TUNER PWB
CNS101
TO TAPE MECHANISM
TAPE1 HEAD
P34 4 - D
P34 5 - D
FC701
HEADPHONES
PWB-A5
22
1
CNS701
P33 8 - H
TO DISPLAY PWB