Harman Kardon CDR 20 (serv.man13) Service Manual ▷ View online
-25-
NO
•Check the communication Iines
between IC701 and IC201.
•Check and replace the 701.
Writing Part Check.
Does the unit
becomes stand-by mode to
record/dubbing?
YES
NO
Eject Tray.
Go to “ALPC Logic Circuit Check”.
Dose Writing finish
without any error?
YES
NO
NO
Go to “BETA Measurement
Circuit Check”.
Circuit Check”.
Check the connection of IC201
pin 187 and replace IC201.
pin 187 and replace IC201.
Is the written file
read nomally?
Is the re-written file
readed nomally?
Is
ROPCSH input signal
Pulse when CD-R writing
(IC401 pin 43)
YES
YES
Refer “Laser is abnormal”.
Load tray with CD-R/RW Disc.
Start Recording or dubbing.
OK
YES
•Check the connection of IC601 pin 13.
•Check and replace the IC601.
•Check and replace the IC601.
•Check the connection lines of IC201.
•Check and replace the IC201.
•Check and replace the IC201.
•Check the connection lines of IC601.
•Check and replace the IC601.
•Check and replace the IC601.
•Check the connection lines of
IC601 pin 21,18.
•Check and replace the IC601.
YES
Are
IC601 pin 29(EFM1),
30(EFM2),42(RESAMP1),
2(RESAMP2), 41(ROPC1)
pulse signals?
Are IC401 pin
38(WFPDSH),39(RFPDSH),
40(WBLSH), 41(SPDSH), 42(MPDSH)
pulse signals?
Are CN401
pin30(ODON) 31(W/XR)
pulse signals?
IC401 Pin 27(WGATE)=“H”?
YES
IC601 Pin 50(WLDON)=“H”?
YES
-26-
ALPC Logic circuit check
IC601 Pin 33(CDR/RW)=“H”?
IC601 Pin 34(WR/RE)=“H”?
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
Execute ‘E. LD On’ of ‘How to
use Test Tool(Dragon)’:
‘CD-R Recording Mode’
K
Dragon : Execute LD ‘off’
Dragon : Execute LD ‘off’
•Check the connection of IC701 pin 20.
•Check and replace the IC701.
•Check and replace the IC701.
•Check the connection of IC701 pin 7.
•Check and replace the IC701.
•Check and replace the IC701.
•Check the connection of IC201 pin 166.
•Check and replace the IC201.
•Check and replace the IC201.
-27-
•Check the connection of IC601 pin 13.
•Check and replace the IC601.
•Check and replace the IC601.
•Check the connection lines of IC201.
•Check and replace the IC201.
•Check and replace the IC201.
•Check the connection lines of IC601.
•Check and replace the IC601.
•Check and replace the IC601.
•Check the connection lines of
IC601 pin 21,18.
•Check and replace the IC601.
YES
Are
IC601 pin29(EFM1),
30(EFM2), 42(RESAMP1), 2(RESAMP2),
41(ROPC1) pulse signals?
Are
IC401 pin 38(WFPDSH),
39(RFPDSH),40(WBLSH),
41(SPDSH), 42(MPDSH)
pulse signals?
Are
IC401 pin30(ODON)
41(W/XR) pulse signals?
IC601 Pin 27(WGATE)=“H”?
YES
IC401 Pin 50(WLDON)=“H”?
YES
IC601 Pin 33(CDR/RW)=“L”?
IC601 Pin 34(CDR/R/W)=“H”?
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
Execute ‘E. LD On’ of ‘How to
use Test Tool(Dragon)’: ‘CD-RW
Recording Mode’
use Test Tool(Dragon)’: ‘CD-RW
Recording Mode’
K
Dragon : Execute LD ‘off’
Dragon : Execute LD ‘Off’
•Check the connection of IC701 pin 20.
•Check and replace the IC701.
•Check and replace the IC701.
•Check the connection of IC701 pin 7.
•Check and replace the IC701.
•Check and replace the IC701.
•Check the connection of IC201 pin 166.
•Check and replace the IC201.
•Check and replace the IC201.
Normal
NO
-28-
IC405 Pin 10(CDR/RWS)=“H”?
YES
YES
IC701 Pin 78(RFBETA):
2+/-1.0V?
Is BETA signal nomal?
(IC405 pin 14)
YES
BETA Measurement circuit ceck
IC401 Pin 86(RRF):3+/-1.0V?
RRFIN:2+/0.7V?
(IC401 PIN85)
NO
NO
NO
NO
YES
YES
After inserting Test Dise(TCD-784),
start playing.
K
Check the replace the IC405(BU4052)
•Check the connection of IC401 pin 86.
•Check and replace the IC401
•Check and replace the IC401
(CXA2551R).
•Check the connection of IC407.
•Check and replace the IC407.
•Check and replace the IC407.
•Check the connection of IC701 pin 20.
•Check and replace the IC701(MICOM).
•Check and replace the IC701(MICOM).
•Check the connection of IC401 pin 82.
•Check and replace the IC401.
•Check and replace the IC401.
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