Kenwood RDM-23 Service manual
70%
COMPACT AUDIO SYSTEM
RD-M23
SERVICE MANUAL
(For M,X type)
Front cabinet
(A60-2147-08)
CD lid
(J19-6268-08)
Knob
(K29-8084-08)
© 2001-9 PRINTED IN KOREA
B51-5756-00 (K/K) 547
Plate
(B03-3900-08)
Knob
(K29-8085-08)
Clear panel(DISK)
(B10-3764-08)
Bottom cabinet
(A10-3564-08)
Digital out jack
(W02-2878-08)
Terminal
(E70-0149-08)
In compliance with Federal Regulations, following are reproduction of labels on, or inside the product relating to laser product safety.
Socket
(E63-1228-08)
Rear panel
(A80-4203-08)
Socket
(E03-0384-08)
Terminal
(E21-0040-08)
Headphone jack
(E11-0944-08)
KENWOOD-Corp. certifies this equipment conforms to DHHS
Regulations No.21 CFR 1040. 10, Chapter 1, subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM.
AC power lead x1
(E30-7240-08): X
(E30-7237-08): M
Remote control x1
(A70-1547-08)
Battery cover(A09-1243-08)
FM antenna x1
(T90-0891-08)
AM loop antenna x1
(T90-0890-08)
"AAA" size battery
(UM-4, R03, HP-16 or similar)x2
RD-M23
Troubleshooting
If trouble occurs
When this product is subjected to strong external interference
(mechanical shock, excessive static electricity, abnormal supply
voltage due to lightning, etc.) or if it is operated incorrectly, it may
malfunction.
If such a problem occurs, do the following:
Caution:
This operation will erase all data stored in memory including clock,
timer settings, tuner preset, and CD programme.
1 Set the unit to the stand-by mode and turn the power on
again.
2 If the unit is not restored in step 1, unplug and plug in the
unit, and then turn the power on.
3 If neither step 1 nor 2 restores the unit, do the following:
Press the ON/STAND-BY button to enter the power stand-by
mode.
Unplug the AC power lead from the AC INPUT socket on the
unit.
Whilst pressing down the MEMORY/SET button and the /
button, plug the AC power lead into the AC INPUT socket on
the unit.
AC INPUT
The marking this product has been
classified as Class 1. It means that there
is no danger of hazardous radiatio
outside the product.
CONTENTS / ACCESSORIES
Contents
CONTENTS / ACCESSORIES .................................. 2
DISASSEMBLY FOR REPAIR....................................3
BLOCK DIAGRAM ......................................................5
TROUBLE SHOOTING ...............................................7
TEST MODE .............................................................10
ADJUSTMENT ..........................................................13
WAVR FORM............................................................15
Attention
Please contact our KENWOOD Service Department in your side if you want the service information; Circuit Description. Full
Described Parts list and so. Information is available to you by internet from us.
Accessories
PARTS DESCRIPTIONS ..........................................16
PC BOARD .............................................................. 17
SCHEMATIC DIAGRAM .......................................... 21
EXPLODED VIEW ....................................................29
PARTS LIST..............................................................31
SPECIFICATIONS ......................................Back cover
2
CLASS 1
LASER PRODUCT
1
Rear panel/Terminal PWB
1. Screw .................. (A1) x7 8-1
2. Socket ................. (A2) x2
3. Screw .................. (A3) x3 8-1,2
2 Top cabinet 1. Screw .................. (B1) x2 8-2
2. Hook .................... (B2) x5
3. Flat Cable ............ (B3) x1
4. Socket ................. (B4) x7
3 Tuner PWB 1. Screw .................. (C1) x2 9-1
2. Socket ................. (C2) x1
4 Power PWB 1. Socket ................. (D1) x1 9-1
2. Hook .................... (D2) x1
5 Main PWB 1. Socket ................. (E1) x1 9-1
2. Screw .................. (E2) x8
6 Display PWB 1. Screw .................. (F1) x4 9-2
2. Hook .................... (F2) x4
7 CD Mechanism 1. Screw .................. (G1) x4 9-2
8 Gear Box 1. Screw .................. (H1) x1 9-2
2. Holder .................. (H2) x1
3. Lever ................... (H3) x1
4. Screw .................. (H4) x2
5. Lever ................... (H5) x1
9 LED PWB 1. Screw .................. (J1) x1 9-2
STEP REMOVAL
PROCEDURE
FIGURE
Note:
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector remove to protect the optical pickup
from electrostatic damage.
Caution on Disassembly
Follow the below-mentioned notes when disassembling
the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Take compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need to
be removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
(A1) x2
ø3 x10mm
(A1) x3
ø3 x10mm
(A1) x2
ø3 x10mm
Rear Panel
Top Cabinet
(A2) x2
(A3) x2
ø3 x10mm
Rear Panel
Terminal PWB
Figure 8-1
(B1) x2
ø2.5 x8mm
(B4) x2
(A3) x1
ø3 x8mm
Lug
(B4) x4
(B3) x1
Hook
(B2) x3
HOOK
(B2) x2
(B4) x1
CD Mechanism
Main PWB
Power PWB
Hook
Up
Slide
Bottom Cabinet
Top Cabinet
Top Cabinet
Bottom Cabinet
Figure 8-2
(C1) x1
ø3 x8mm
(E2) x7
ø3 x8mm
(E2) x1
ø3 x14mm
(D2) x1
(C1) x1
ø3 x6mm
(D1) x1
(E1) x1
Power PWB
Holder PWB
Tuner PWB
Main PWB
(C2) x1
Tuner PWB
(C2) x1
Main PWB
Hook
Bottom Cabinet
Figure 9-1
Figure 9-2
(G1) x4
ø2.5 x10mm
(H1) x1
ø3 x8mm
(H2) x1
(H5) x1
(H4) x2
ø2.5 x10mm
(J1) x1
ø2.5 x10mm
(F1) x4
ø2.5 x10mm
Hook
(F2) x4
Display PWB
LED PWB
Switch
PWB
Gear Box
CD Mechanism
Top Cabinet
Holder PWB
(H3) x1
Bracket
DISASSEMBLY FOR REPAIR
RD-M23
3
4
How to remove the CD lid (See Fig. 10-1.)
Perform steps 1,2 and 8 of the disassembly method to remove
the gear box.(See page 8,9)
1. Remove the switch PWB.
2. Remove the screws (A1) x 4 pcs., to remove the gear box
lid.
3. Remove the gears (A2) x 1 pc. and (A3) x 1 pc.
4. Remove the screws (A4) x 2 pcs., to remove the motor.
Caution:
Be careful so that the gear is not damaged.
(The damage gear emits noise during searching.)
Figure 10-1
Figure 10-2
(A1) x1
ø2.5 x10mm
(A1) x3
ø2.5 x12mm
(A2) x1
(A3) x1
(A4) x2
ø2 x5mm
Switch PWB
CD Lid Motor
CD MECHANISM SECTION (See Fig. 10-2.)
Perform steps 1,2 and 7 of the disassembly method to remove
the CD mechanism.(See page 8,9)
1. Remove the mechanism cover, paying attention to the
pawls (A1)x 4 pcs.
2. Remove the screws (A2) x 2 pcs., to remove the shaft (A3)
x 1 pc.
3. Remove the stop washer (A4) x 1 pc., to remove the gear
(A5) x 1 pc.
4. Remove the pickup.
Note:
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector remove to pretect the optical pickup
from electrostatic damage.
Pickup unit
(A2) x2
ø2.6 x6mm
(A1) x4
CD Mechanism
Shaft
(A3) x1
Gear
(A5) x1
Stop Washer
(A4) x1
Mechanism Cover
RD-M23
REMOVING AND REINSTALLING THE MAIN PARTS
DISASSEMBLY FOR REPAIR
2
1
VOLTAGE
REGULATOR
3
1
3
4
2
1
USWD_5R6V
P_CONT
D_GND
3 2 1
AC INPUT
SOCKET
AC 110/127/220/
230~240V, 50/60Hz
AC POWER SUPPLY CORD
VOLTAGE
SELECTOR
POWER
TRANSFORMER
(SUB)
FROM
DISPLAY PWB
POWER PWB-B
CNP651
SO655
SW651
IC681
KIA7805API
D688
1N4004
RLY601
CNP707
T681
D681~D684
Q683
Q681
4
3
2
1
4
3
2
1
3 5 5 7 7 9 9
1
POWER
TRANSFORMER
(MAIN)
TF
T651
T2.5A L 250V
CNP801
F651
T1.25A L 250V
F653
Q606
Q607
D651~D654
D657~D660
Q801
Q101
Q102
Q601
Q602
Q605
Q603
Q604
Q608
Q609
CD +B
CNP652
FROM
DISPLAY PWB
+B
CD_6R2V
+B2
+B3
+B4
+B6
M_12V
A_12V
POWER AMP.
IC901
LA4282
L-CH
L-CH
R-CH
R-CH
L-CH
R-CH
SPEAKER TERMINAL
+
+
SO601
HEADPHONES
1
2
3
4
5
9
10
J601
VSS
VDD
IC401
LC75342M
15
14
13 12
11
10
9
17
18
19
20
21
22
23
24
25
26
27
28
29
16
8
7
6
5
4 3 2 1
CE
DI
30
CL
LOGIC
TUN L
CD L
TUN R
R-CH OUT
L-CH OUT
A_12V
NC
FUNCTION/VOLUME
EQUALIZER
Q901 Q902
Q908 Q907
Q861
Q802
AUX R
AUX L
CD R
7654321
8
9
10
11
12 13 14 15
CNP702
CLID_SW
CLID_UP
CLID_PRO
CLID_DW
BUCK
BUS2
BUS0
BUS1
BUS3
CCE
CD_RES
PU_IN
LIGHT
CD_STB
DIMMER
SBAD
FEO
FEN
VRO
RFRP
RFIS
RFGO
RFGC
AGCI
RFO
GND
RFN
TEO
TEN
2VRO
TEB
SEL
LDO
MDI
TN1
TPI
FPI
FNI
VCC
SERVO PRE AMP.
IC801
TA2109F
SERVO/SIGNAL CONTROL
IC802
TC9462F
DOUT
TERMINAL
PWB
VSS
VSS
VSS
AVSS
XVSS
TESIOO
TESIN
TESI01
VSS
VSS
PXI
DVSL
DVSR
PDO
TMAX
VCOREV
RFI
RFCT
LPFN
LPFO
PVREV
TSIN
VREF
X801
16.93MHz
XO
XI
VDD
VDD
VDD
VDD
VDD
XVDD
AVDD
2VREF
SEL
RFGC
TEBC
FOO
TRO
TEI
TEZI
RFRP
FEI
SBAD
P2VREF
SWITCHING
MUTE
VOLTAGE
REGURATOR
VOLTAGE
REGURATOR
+B6
R-CH
L-CH
SO401
VIDEO/AUX
INPUT
CD LID
MOTOR DRIVER
1
23
5
6
7
8
9
IC805
TA7291S
11 10 9 8 7 6 5 4 3 2 1
CE
CL
DI
SD
FM ST
DO
A_12V
D_GND
TUN L
TUN R
A_GND
11
1 2 3 4 5 6
7 8 9 10
SD
STEREO
DO
CE
DI
CL
CD +B
P_MUTE
P_STB
D_GND
A_12V
+B1
+B3
+B6
+B2
+B4
CNP703
CNP307
TO
TUNER PWB
FROM
DISPLAY PWB
FROM
DISPLAY PWB
LED PWB
SWITCH PWB
CD LID
OPEN/CLOSE
SW802
CD LID
OPEN/CLOSE
MOTOR
M
M801
FOCUS/TRACKING/
SPIN/SLED DRIVER
1234
5
6
7
8
9910111213
16 17 18 19 21 22 23 24 25 26 2728
PO1-
PO1+
VO3-
VO3+
VIN3
VG3
VCC
VCC
BIAS
VG4
VIN4
VO4+
VO4-
OPO
VO2-
VO2+
VIN2
VG2
GND
GND
GND
MUTE
REG O
TRB
VG1
VIN1
VO1+
VO1-
IC804
MM1469XH
SPINDLE
MOTOR
SLED
MOTOR
PICKUP IN
SP+
SP–
SP+
SL–
PU-IN
GND
FO
TR
+
–
–
+
M
M
CD MOTOR PWB
NM802
NM801
NSW801
CD_7V
5V
+B2
+B4
+B7
+B7
+B7
A
C
B
F
E
+B7
+B7
+B7
LD
MON
FOCUS COIL
1/2V
5V
TRACKING COIL
PICKUP UNIT
23
24
22
21
20
19
18
17
16
45
40
38
34
33
32
31
30
28
50
56
57
51
52
48
49
46
47
43
42
44
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
DIGITAL
OUT
3
2
1
J801
5355
FMO
DMO
100
90
97
96
93
92
91
78
79
BUS0
BUS1
BUS2
BUS3
BUCK
/CCE
/RST
85
82
RO
LO
14
23
39
62
76
80
94
6152436 63 71 72 73 74 77 95 81 86
D_GND
A_GND D_GND
D_GND
M_GND
M_GND
M_GND
M_GND
25
MAIN PWB
AC 110/127/220/
230~240V, 50/60Hz
5 12910 11 3 7 4 2
IN2
POWER
–GND1
VCC
OUT1
FIL
OUT2
GND
NF1
110V
127V
220V
230~240V
F654
2A 250V
TF
5
BLOCK DIAGRAM
RD-M23
AM
GND
FM
75ohms
SO301
VSM
AM RF
OUT
OUT
OUT
OUT
IN
IN
CUT
AM LOW
FM/AM
MPX VCO
MPX IN
MO/ST
L-CH
R-CH
FM AFC
AM OSC
AM OSC
(AM/FM)
PHASE
PHASE
IF OUT
VCC
FM DET
STEREO
SD
GND
AM IF
REG
AM MIX
OUT ININ
FM IF
23 22 21 20 19 18 17 16 15 1424 13
121110987654321
PLL(TUNER)
111098765431
PD
IF IN
AM IN
FM IN
VDD
AIN
AOUT
VSS
X OUT
22 21 20 19 18 17 16 15 14 13 12
FM
FM
MUTE
CEDICL
DO
MO/ST
IF REQ
X IN
IC302
LC72131
FM FRONT END
1
2
3
4
56 7 9
8
IC301
BF301
BAND PASS
FILTER
TA7358AP
1
2
3
TP301
456kHz
X351
32.768kHz
8MHz
Q351
Q360
ZD351
10
11
1
2
3
4
5
8
9
6
7
SD
FM ST
DO
CL
CE
DI
A_12V
D_GND
TUN_L
TUN_R
A_GND
TO
MAIN PWB
CNS307
TUNER PWB
38541
1
100
67
57
56
20
59
66
65
64
63
62
61
60
58
53
54
51
39 46 49 5032
47
8
4
LCD701
LCD DISPLAY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LIGHT
BUS0
BUS1
BUS2
BUS3
BUCK
CCE
CD_STB
CLID_DW
CLID_UP
CLID_PRO
CLID_SW
CD_RES
PU-IN
DIMMER
LIGHT
BUS0
BUS1
BUS2
BUS3
BUCK
CCE
CD_STB
CLID_DW
CLID_UP
CLID_PRO
CD_RES
PU-IN
DIMMER
B-LIGHT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
TO
MAIN PWB
TO
MAIN PWB
TO
POWER PWB
TO
MAIN PWB
CNS702
CNW702
REMOTE
SENSOR
RX701
3
2
1
3
4
2
1
2
1
CNW707
CNS707CNS652
RESET
VLC1
VLC2
VLC3
7
6
5
MMOD
VREF–
VREF+
VSS
15
24
14
11
SYS_STOP
POWER
3837
13
12
10
9
X701
X702
OSC1
OSC2
XO
XI
CLID_SW
SW711~713
SW721,722
SW725~727
SW709
SW718
SW710
KEY1
KEY2
18
17
16
SYSTEM MICROCOMPUTER/
FL DRIVER
IC701
IX0039SJ
D_GND
A_24V A_12V
P_STB
P_MUTE
CD+B
DI
CE
CL
DO
STEREO
SD
11
10
9
8
7
6
5
4
3
2
1
11
10
9
8
7
6
5
4
3
2
1
CNW703
CNS703
CD+B
STEREO
SD
DI
CLDOCE
28272625
SURR
P–STB
P–MUTE
454443
DISPLAY PWB
Q708
Q707
Q709
Q706
ANTENNA
TERMINAL
AM Band
Coverage fL
FM MUTE
LEVEL
AM IF
FM IF
AM
Tracking fL
FM RF
VD301
VD303
VD302
FM IF DET/
FM MPX/AM IF
IC303
LA1832S
+5V
+5V
VT
+5V
+5V
+B
FM +B
+5V
FM +B
+5V
T302
T306
T304
T351
CF303
L302
FM ANT.
FM Band
Coverage fL
FM +B
FM +B
L303
FM OSC.
CF302
FM IF
FM IF
CF352
CF351
AM IF
SWITCHING
SWITCHING
RESET
SWITCHING
Q306
Q302
Q701
Q702
Q703
VR351
X352
4.5MHz
VOLTAGE
REGURATOR
COM0
COM3
SEG0
SEG33
REMOCON
P_CONT
USWD_5R6V
D_GND
P–CONT
VDD
GND
LED701 LED702
LED PWB
6
RD-M23
BLOCK DIAGRAM
Cleaner Liquid
Cleaning Disc
PARTS CODE: UDSKA0004AFZZ
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. You will hear music for about 20 seconds and the CD player will automatically stop. If it continues to turn, press the stop button.
CAUTION
The CD lens cleaner should be effective for 30 - 50 operations, however if the brushes become worn out earlier then please
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.
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
the objective lens, and check the playback operation. When this section does not operate even after the above step is taken,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 off the power, and wipe the lens softly using a cleaning paper moistened with commercially available cleaning solution so
as not to damage it.
Be careful not to touch the lens with bare hands.
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.
Make sure that the disc is normal, and set the CD TEST MODE (STEP 1).
Is the measured voltage as specified in circuit diagram?
Check the main unit power supply circuit.
No
Yes
No
Is "Er-CD01" displayed"?
Yes
Move the pickup to most internal circumference side of disc.
Turn the power off and reset the CD TEST MODE (STEP 1).
Is "PU ERROR " not displayed?
Yes
Check the PWB pattern between pin 59 (CD_RES) of IC701 and
pin 100 (/RST) of IC802.
No
Is +5V applied to pin 100 (/RST) of IC802?
Yes
Is CD Lid switch SW802
ON condition ?
No
Does the CD TEST MODE advance from "STEP 2"?
Yes
Check the between pattern IC701 and SW802 If OK.
Check the main unit power supply circuit.
No
Does the laser come on in CD TEST MODE "STEP 2"?
Check the procedure in "LASER FAILURE".
Yes
Does the CD TEST MODE advance from "STEP 3" to "STEP
4"?
Check the procedure in "FOCUS FAILURE".
Yes
Yes
Does the spindle motor rotate normally when the CD TEST
MODE changes from "STEP 4" to "STEP 3"?
Yes
Is the HF output on pin 38 of IC802 in CD TEST MODE "STEP 5"?
Check the procedure "HF ERROR".
Yes
No
No
No
No
Check the pattern between pin 58 (PU_IN) of IC701 and
CNW803/CNS803.
Check the between CNW803/CNS803 and PU-IN switch.
Set ON condition the CD
Lid switch.
Check the procedure in "SPINDLE MOTOR CLV SERVO
FAILURE".
No
Does the sled motor
move ?
No
Does the sound heard when the optical pickup move to the
selected play by the FF
/REW key.
Check the procedure "NO SOUND"
No
Yes
Check the procedure in
"SLED MOTOR
OPERATING FAILURE ".
Does the LCD track number and time indicator work properly ?
Check the pattern between IC701 and LCD701.
Yes
No
Is "Er-CD01 "
displayed ?
No
Turn the power off and then back on.
Does the unit initialize properly and start playback when PLAY
key is pressed?
Check the pattern between pin 58 (PU_IN) of IC701
and CNW803/CNS803. Check the between CNW803/
CNS803 and PU-IN switch.
No
Yes
Check the procedure in
"HF ERROR".
Yes
Does the unit play in order in the FF mode?
Check the procedure in "TRACK SEARCH FAILUR".
Yes
Does playback continue for 30 seconds after the start of
playback ?
Check the procedure in "SLED SERVO FAILURE".
Yes
Normal
No
No
Yes
TROUBLE SHOOTING
RD-M23
7
8
Check the PWB pattern between emiter of Q607 and emiter of
Q861.
• Laser failure.
Is 0V applied to the pin 57 (SEL) of IC802 ?
Yes
No
Does the laser come on when pattern cut between pin 8 (SEL) of
IC801 and pin 57 (SEL) of IC802 ?
Check the PWB pattern between IC701 and IC802 (BUCK/CCE/
BUS0~3)
Yes
Yes
No
Check the peripheral parts of IC801 and Q801. If it is normal, the
optical pickup is faulty.
No
Check CNP802/CNW3. If it is normal, the optical pickup is
faulty.
Is approx. 2V applied to the collector of Q801.
• Focus failure.
Does the optical pickup move up and down when the disc is
removed?
Is the following waveform ouput at the pin 43 (FEI) of IC802
when the disc is set?
Is the waveform shown above input at the pin 44 (SBAD) of
IC802?
Yes
Yes
No
No
The optical pickup is faulty.
Check as stated in item "FOCUS SERVO SAWTOOTH WAVE
FAILURE".
Yes
Check the periphery of IC801 and CNP802/CNW3. Is it normal?
No
Check the pattern between pin 13 of IC801 and pin 44 of IC802.
Check the periphery of IC801 and CNP802/CNW3.
IC801 is faulty.
Yes
Is +6.2V applied to the emiter of Q861 ?
Is +5V applied to the collector of Q861 ?
Yes
No
No
Check the peripheral parts of IC804 and Q861.
Is +5V applied to the pin 62 (VDD) of IC802 ?
Is +5V applied to the pin 1 (VCC) of IC801 ?
Yes
No
No
Check the PWB pattern between collector of Q861 and pin 62 of
IC802.
Check the PWB pattern between collector of Q861 and pin 1 of
IC801.
pin 43
(FEI)
pin 48
(FOO)
pin 44
(SBAD)
Yes
Yes
• Focus servo sawtooth wave failure.
Is +6.2V applied to the pins 21 and 22 (VCC) of IC804 ?
Is sawtooh wave output to the pin 48 (FOO) of IC802 ?
IC802 is faulty.
No
Yes
Yes
Is sawtooth wave obtained between pins 26 and 27 of IC804 ?
No
No
Check the PWB pattern
between pin 7 of IC804
and pin 60 (CD STB) of
IC701.
Is +5V applied to the pin 7
(MUTE) of IC804 ?
Check the PWB pattern between pin 48 (FOO) of IC802 and pins
24 and 25 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between pin emiter of Q607 and IC804.
No
Is sawtooth wave obtained between pins 13 and 16 of
CNP802/CNW3 ? (as shown above)
Yes
Check the PWB pattern between CNP802/CNW3 and IC804.
No
CNP802/CNW3 connection failure or optical pickup failure.
Yes
• Spindle motor clv servo failure.
Is above wave obtained between pins 11 and 12 of IC804 ?
Is following wave output to the pin 55 (DMO) of IC802 when
the CD TEST MODE "STEP 3" is changed to " STEP 4" ?
No
Yes
Check the procedure in "HF ERROR".
If OK. IC802 is faulty.
Check the PWB pattern between pin 55 (DMO) of IC802 and pins
9 and 10 of IC804. If OK. IC804 is faulty.
No
Is above wave obtained between pins 9 and 12 of CNP802/
CNW3 ?
Yes
Check the PWB pattern between CNP802/CNW3 and IC804.
No
CNP802/CNW3 connection failure or optical pickup failure.
Yes
DMO
Yes
1.5~2.5sec
1.5~2.5sec
RD-M23
TROUBLE SHOOTING
• HF error.
Yes
Yes
Is output (tracking error signal) obtained at the pins 46 (TEI)
and 47 (TEZI) of IC802 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
Is output (HF signal) obtained at the pin 38 (RFI) of IC802
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
Is output (HF signal) obtained at the pins 41 (RFZI) and 42
(RFRP) of IC802 when the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
No
No
• No sound.
No sound from both L and R-ch?
Yes
Is +4.5V applied to pin 83 (DVDD) of IC802?
No
Check the PWB pattern between pin 49 (TRO) of IC802 and pin 19
of IC804.
Check the periphery of IC804 and CNP802/CNW3.
If OK. Optical pickup failure.
Check the periphery of IC801.
Check the PWB pattern between pin17 (RFRP) of IC801 and pins
41 (RFZI) and 42 (RFRP) of IC802.
If OK. IC801 is faulty.
No
Yes
Normal.
Check the interval between the pins 82 or 85 of IC802 and the pins
2 or 5 of IC901.
No
Check the PWB pattern between R819 and Q861.
Yes
Is signal of pins 82 and 85 of IC802 output?
No
Check the peripheral parts of IC802. If OK, IC802 is faulty.
Yes
The main PWB is faulty.
Check the periphery of IC801.
Check the PWB pattern between
pin 12 (TEO) of IC801 and pins 46
and 47 of IC802.
Is it normal ?
Is output obtained at the pins 3 and
8 of CNP802/CNW3.
Optical pickup failure.
IC801 is faulty.
Check the periphery of IC801.
Check the PWB pattern between pin 19 (RFGO) of IC801 and pins
38 (RFI) of IC802.
If OK. IC801 is faulty
Is output obtained at the pins 4 and
5,6 of CNP802/CNW3.
Optical pickup failure.
Is the following wave output to the pin 55 (DMO) of IC802
when the CD TEST MODE "STEP 4" or "STEP 5"?
Check the periphery pins 28~32 of IC802.
If OK. IC802 failure.
No
No
No
Yes
Yes
No
Yes
Yes
test mode "step 4" test mode "step 5"
TEI
TEZI
test mode "step 4" test mode "step 5"
RFI
test mode "step 4" test mode "step 5"
RFZI
RFRP
test mode "step 4" test mode "step 5"
DMO
• Sled motor operation failure.
Yes
Yes
Is following sled feed signal output the pin 53 (FMO) of IC802
when FF
/REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
Is sled feed signal output the pins 1 and 2 of IC804?
Is sled feed voltage applied between both terminals of sled
motor?
No
Check the peripheral parts of IC804. If OK, IC804 is faulty.
No
C801 is faulty.
Check the CNW803/CNS803.
No
Yes
Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
• Sled servo failure.
Yes
Is following sled signal output the pin 53 (FMO) of IC802
during playback?
Normal.
No
IC802 is faulty.
• Track search failure
Does the sled motor run in FF/REW state when the SERVO
TEST MODE "STEP1" is set?
Is the following wave output to the pin 49 (TRO) of IC802
during track search in normal playback?
Is the following wave output to the pins 12 (TEO) of IC801
during track search in normal playback?
Yes
Yes
No
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
IC802 failure.
No
Check the PWB pattern between pin 49 (TRO) of IC802 and pin
19 of IC804.
Check the PWB pattern between pins 17 and 18 of IC804 and
Optical pickup.
If OK. Optical pickup failure.
Yes
Is the above wave output to the pins 46 (TEI) and 47 (TEZI) of
IC802 during track serch in normal playback?
No
Check the PWB pattern between pin 12 (TEO) of IC801 and pins 46
and 47 of IC802. If OK. IC801 failure.
Normal.
Yes
Yes
Is following sled feed signal output the pins 3 and 4 of IC804
when FF
/REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
Check the PWB pattern between pin 53 of IC802 and pins 3 and 4
of IC804.
No
Is the following wave output to the pin 41 (RFZI) and 42
(RFRP) of IC802 during track search in normal playback?
No
Check the PWB pattern between pin 17 (RFO) and 18 (RFIS), 19
(RFRP) of IC801 and pins 41 and 42 of IC802. If OK. IC801 failure.
Yes
TRO
TEO
TEI
TEZI
FF REW
FMO
FMO
RFZI
RFRP
FF REW
SL ±
9
TROUBLE SHOOTING
RD-M23
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