Sony HCD-GPX33 / HCD-GPX55 / HCD-GPX77 / HCD-GPX88 Service Manual ▷ View online
HCD-GPX33/GPX55/GPX77/GPX88
17
SECTION 5
TROUBLESHOOTING
Switching Regulator Diagnosis Flow
The Output from Switching regulator is checked.
Is following power voltage up to standard?
Standby
Demo mode Power On
CN 201 pin1
CN 401 pin9
AC
IN
Ye
s
No
Ye
s
END
No
Checks whether the state of a Cable and Outlet are normal.
If there are no problems, checks circumference circuit for
Main on/Sub on Output of Main mount side.
Replaces Switching regulator if it is not up to standard.
The Power Control signal to Switching regulator is checked.
Is following power voltage OK?
Main on/Sub on
Standby
Demo mode Power On
CN 201 :pin7 Low (0V) Hi (3.3V)
Hi (3.3V)
13V±0.5V
13V±0.5V
0V
61V±2.5V
pin6
0V
23V±2.5V (HCD-GPX77/GPX88)
24V±2.5V (HCD-GPX33/GPX55)
pin4
0V
-23V±2.5V (HCD-GPX77/GPX88)
-24V±2.5V (HCD-GPX33/GPX55)
pin1
0V
-61V±2.5V
(1) AC
input
(2) Fuse
(3) Sub Power transformer
(4) CN 201 Connector
pin1-2: 13V
pin3-4: GND
pin5: AC-DET
pin7: MAIN-ON
(5) MAIN Power transformer
(6) CN 401 Connector
pin1-3: V1- (DC-61V)
pin4: V2- (DC-24V)
pin5: GND
pin6: V2+ (DC+24V)
pin7-9: V1+ (DC+61V)
(2)
(1)
(4)
(6)
(3)
(5)
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
P
PANEL
REMOVE S
ID
E
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.
HCD-GPX33/GPX55/GPX77/GPX88
19
Optical Block Diagnosis Flow (2/2)
Does laser diode become luminous ?
(Visual check)
Is output level of RF signal (CL574) up to standard?
RF Level = 1.0 ±0.25 Vpp
Test CD:YEDS-18
Is there no problem with Long term Aging Test (60min)?
Confirms that there is no sound skip.
END
No
No
Check JL802 (LD650) signal
Does it output 2.2V when laser become luminous?
Check JL806 (LD780) signal
Does it output 1.8V when laser become luminous?
Checks circumference circuit of Q881 or Q891.
Checks circumference circuit of IC501 LDO1 and LDO2.
The Optical pickup has a problems.
Replaces BU.
DISC IN
No
A
Is output level of RF signal (CL574) up to standard?
RF Level = 1.0 ±0.25 Vpp
Test CD:YEDS-18
Replaces BU if it is not up to standard.
No
No
If it is not up to standard,
Lens cleaning is performed.
The Optical pickup has a problems.
Replaces BU.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Ver. 1.1
HCD-GPX33/GPX55/GPX77/GPX88
20
MB Mount Diagnosis Flow (1/2)
PLA
Y MUSIC
Is there audio output from MB Board?
Checks 13.5V output of CN200 1pin.
Is the power voltage OK?
Checks 3V output of CN200 6pin(Main on)
Is the power voltage OK?
Checks 61V output of CN1001 1pin(PVDD).
Is the power voltage OK?
Checks OUT
terminal-49V output of REG IC1000
Or
, Checks GND and OUT
T
erminal with
Tester
.
Is it shorted out?
Reinserts the cable or Exchanges.
If there are no problems, checks output of
Switching regulator board.
Reinserts the cable or Exchanges.
If there are no problems, checks output of
Main on Output of MB Board side.
Reinserts the cable or Exchanges.
If there are no problems, checks output of
Switching regulator board.
Checks circumference circuit of REG IC1000.
If there are no problems, exchanges IC1000.
A
B
Yes
No
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Ver. 1.1
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