Sony HCD-GZX33D / HCD-GZX55D / HCD-GZX88D Service Manual ▷ View online
HCD-GZX33D/GZX55D/GZX88D
21
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
Check IC653 for 3.3V.
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-GZX33D/GZX55D/GZX88D
22
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-GZX33D/GZX55D/GZX88D
23
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
No
No
No
No
Yes
Yes
Yes
Yes
HCD-GZX33D/GZX55D/GZX88D
24
MB Mount Diagnosis Flow (2/2)
END
Checks OUT
T
erminal 5V output of REG IC1009 or
,
Checks GND and OUT
T
erminal with
Tester
.
Is it shorted out?
Assembles into the unit again then, checks
whether there is the audio output from
MB Board.
Checks circumference circuit of REG IC1009.
If there are no problems, exchanges IC1009.
Checks circumference circuit of REG IC1010.
If there are no problems, exchanges IC1010.
Replaces MB Board
Replaces MB Board
A
B
Yes
Yes
Yes
Yes
No
No
No
No
Checks OUT
T
erminal -5V output of REG IC1010 or,
Checks GND and OUT
T
erminal with
Tester
.
Is it shorted out?
Leave MB Mount to a state of it only and,
checks Power
Audio Driver(MOS FET) with
Tester
.
Is it shorted out?
（
Refer to Page 25.)
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