SONY 910004 Service Manual
Service Technical Information
MODEL NO. |
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CD PLAYER |
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Bulletin # |
91-01-01 |
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SUBJECT: |
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TROUBLESHOOTING GUIDE |
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Date: |
May 11, 2001 |
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START
CD FUNCTION
SELECT
Yes
IS
CD POWER ON?
Yes
DOES UNIT READ
TOC?
Yes
DOES DISC PLAY?
Yes
IS
THERE AUDIO
OUTPUT FROM OP-
AMP?
TECH TIP
Use CD test mode if available
No
CHECK SUPPLY
FROM MAIN PWB
DOES |
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CHECK APC |
LASER |
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No |
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CIRCUIT |
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LIGHT? |
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No
CHECK LASER POWER AND
FOCUS SEARCH
NOT ALL CD
PLAYERS
ARE CAPABLE OF
CHECK DISC 
READING
CD-R/RW DISCS
CHECK TRACKING SERVO
No
(IF DISC SPINS BACKWARDS, THE UNIT HAS TRACKING PROBLEMS)
No
DSP OR
OP-AMP DEFECTIVE
Yes
CD SECTION IS OK
1
DOES |
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CHECK MOTOR, |
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IS |
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X'TAL OR |
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SPINDLE |
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DRIVE CIRCUIT |
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ALL CHECK |
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THE 16.9MHZ |
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ASSOCIATED |
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No |
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Yes |
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No |
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MOTOR |
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AND |
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GOOD? |
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CLOCK |
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CHIP CAPS |
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SPIN? |
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CONNECTORS |
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CORRECT? |
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DEFECTIVE |
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Yes |
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HOT TIP! |
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SOME PICK-UPS HAVE BUFFER |
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IS RF |
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YOU CAN CHECK THE RF AMP BY |
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TOUCHING THE PICK-UP WIRES WHILE |
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AMPS BUILT IN. IN SUCH CASES, |
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OUTPUT |
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No |
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IN FOCUS SEARCH MODE. THE RF AMP |
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THE EYE PATTERN CAN BE SEEN |
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PRESENT? |
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WILL AMPLIFY NOISE FROM YOUR |
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AT THE PICK-UP CONNECTOR. |
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FINGER. |
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Yes |
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ARE
COIL DRIVE CIRCUITS WORKING?
Yes
HOT TIP!
THE IDLE INPUTS FOR EACH MOTOR/
COIL DRIVE IS AT VREF LEVEL. 
MOMENTARILY GROUNDING THE INPUT 
WILL CAUSE THE MOTOR OR COIL TO
MOVE IF THE CHIP IS WORKING
PROPERLY.
THE DRIVE IC CONTROLS THE SLED AND SPINDLE MOTOR AS WELL AS THE FOCUS AND TRACKING COILS
ARE |
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ARE |
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ARE DATA |
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THE DRIVE |
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DATA AND |
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CHECK CPU AND |
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AND CLOCK |
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PULSES COMING |
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No |
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CLOCK PULSES |
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No |
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No |
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INTER-PWB |
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PULSES FROM CPU |
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FROM SERVO |
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FROM DSP |
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CONNECTIONS |
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PRESENT? |
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IC? |
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PRESENT? |
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Yes |
Yes |
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SERVO IC OR
SURROUNDING
DSP OR
COMPONENT Yes
CONNECTED
MAY BE
COMPONENT
DEFECTIVE
DEFECTIVE
THE FOLLOWING APPLIES TO IC # LA9241. REFER TO MANUAL # 09- 992-325-4N2 TO FIND OUT HOW THIS INFORMATION RELATES TO THE
CIRCUIT YOUR TROUBLESHOOTING. |
|
OPEN CHIP CAP: |
|
SYMPTOM |
DEFECTIVE CAP |
READS TOC BUT DOESN'T PLAY |
C16, C41 |
SKIPS AT OUTER TRACKS |
C17 |
DOESN'T READ TOC |
C18, C19 |
DOESN'T READ TOC; DISC BARELY SPINS |
C23 |
DOESN'T READ TOC; DISC SPINS NORMALLY |
C31, C101 |
DOESN'T READ TOC; DISC SPINS VERY FAST |
C33 |
SKIPS WHEN READING THROUGH SCRATCHES |
C39 |
DOESN'T READ TOC; PU TRAVELS TO OUTER TRACKS |
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THEN RETURNS TO CENTER & REPEATS PROCESS |
C13 |
2
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