Sony HCD-GPX555 / HCD-GPX888 Service Manual ▷ View online
HCD-GPX555/GPX888
17
SECTION 5
TROUBLESHOOTING
Switching Regulator Diagnosis Flow
The Output from Switching regulator is checked.
Is following power voltage up to standard?
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 3 : pin6 Low (0V) Low (0V)
Hi (3.3V)
(1) AC
input
(2) Fuse
(3) Sub Power transformer
(4) CN3 Connector
pin1-2: 13V
pin3-4: GND
pin5: AC-DET
pin6: MAIN-ON
(5) MAIN Power transformer
(6) CN 2 Connector
pin1 : V3+(DC+16-23V)_(ref-V1)
pin2-4 : V1-(DC-61V)
pin5 : V2-(DC-24V)
pin6 : GND
pin7 : V2+(DC+24V)
pin8-10 : V1+(DC+61V)
Standby
D
em
o m
ode
Po
w
er On
CN
3
pin
1
13V
±0.
5V
13V
±0.
5V
13V
±0.
5V
CN2
pin10
0V
0V
61V
±5%
pin7
0V
0V
24V
±2.
5V
pin5
0V
0V
-24V
±2.
5V
pin4
0V
0V
-61V
±5%
pin1
0V
0V
16-23V
(2)
(5)
(6)
(3)
(4)
(1)
HCD-GPX555/GPX888
18
Optical Block Diagnosis Flow (1/2)
Does Optical pickup move to inner circumference?
(Visual check)
Yes
Yes
No
Checks CL335 for +3.3V and +1.2V REG IC303.
Does it output the power voltage of 3.3V and 1.2V?
Checks CN401 SL+/SL- signal.
Does it output the signal?
Does Spindle motor rotate?
(Visual check)
Yes
Does Optical pickup do focus search?
(Visual check)
No
Checks IC303 circumference circuit for +1.2V.
Check IC002 (JL040) circumference circuit for +3.3V.
Yes
A
No
No
No
No
No
Checks circumference circuit for SL+/SL- of IC401.
Checks circumference circuit of IC301 FMO Signal.
REMOVE T
OP
P
ANEL
TURN ON
TRA
Y IN
The Sled motor has a problem.
Replaces BU.
Checks CN401 SP+/SP- signal.
Does it output the signal?
The Spindle motor has a problem.
Replaces BU.
Checks circumference circuit for SP+/SP of IC401.
Checks circumference circuit of IC301 DMO Signal.
Checks CN302 FCS+/FCS- signal.
Does it output the signal?
The Optical pickup has a problem.
Replaces BU.
Checks circumference circuit for FCS+/FCS- of IC401
.
Checks circumference circuit of IC301 FOO Signal.
Yes
Yes
Yes
HCD-GPX555/GPX888
19
Optical Block Diagnosis Flow (2/2)
Does laser diode become luminous ?
(Visual check)
Is output level of RF signal (JL317) up to standard?
RF Level = 1.05 ±0.45 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
Checks JL306 (LD780) signal.
Does it output 2V when laser become luminous?
Checks circumference circuit of Q402.
Checks circumference circuit of IC301 LD01.
The Optical pickup has a problems.
Replaces BU.
DISC IN
No
A
Is output level of RF signal (JL317) up to standard?
RF Level = 1.05 ±0.45 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
HCD-GPX555/GPX888
20
DAMP/MB Mount Diagnosis Flow (1/2)
PLA
Y MUSIC
Is there audio output from DAMP Board?
MB Board
DAMP Board
Checks 13V output of CN001 1pin(Main ON).
Is the power voltage OK?
Checks 3V output of CN001 6pin(Main ON).
Is the power voltage OK?
Checks 62.5V output of CN1000 10pin (+VH),
-62.5V output of CN1000 2pin (-VH) and -49V
output of CN1000 1pin (-49V).
Is the power voltage OK?
Checks OUT
terminal -50.5V output of REG IC1002
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 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 IC1002.
If there are no problems, exchanges IC1002.
A
B
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
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