HCD-GPX33, HCD-GPX55, HCD-GPX77, HCD-GPX88 - Sony Audio Service Manual (repair manual). Page 18

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HCD-GPX33/GPX55/GPX77/GPX88
18
Optical Block Diagnosis Flow (1/2)
Does Optical pickup move to inner circumference?
(Visual check)
Yes
Yes
No
CL654: 1.2V
Check voltage supply to MTK IC501
CL577/CL656: 3.3V
Checks CN831 SL+/SL- signal.
Does it output the signal?
Does Spindle motor rotate?
(Visual check)
Yes
Does Optical pickup do focus search?
(Visual check)
No
Check condition of transistor Q354, V
E
§9
C
§9
If there is no problem, check circumference circuit of IC260  
 
(switching regulator) for 3.3V. 
Check IC651 (LDO IC) for 1.2V.
Yes
A
No
No
No
No
No
Checks circumference circuit for SL+/SL-  of  IC851.
Checks circumference circuit of IC501 FMO Signal. 
Yes
Yes
Yes
REMOVE T
O
PANEL
REMOVE S
ID
PANEL
REMOVE CDM TOP P
ANEL
TURN ON
TRA
Y IN
The Sled motor has a problem.
Replaces BU.
Checks CN831 SP+/SP- signal.
Does it output the signal?
The Spindle motor has a problem. 
Replaces BU.
Checks circumference circuit for  SP+/SP of IC851.
Checks circumference circuit  of  IC501 DMO Signal. 
Checks CN801 FCS+/FCS- signal.
Does it output the signal?
The Optical pickup has a problem. 
Replaces BU.
Checks circumference circuit for  FCS+/FCS- of IC851
Checks circumference circuit of  IC501 FOO Signal.
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