Sony MDS-PC1, Service Manual

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SECTION 1
SERVICING NOTE
BD BOARD WAVEFORM CHECK TOOL
Use the jig (J-2501-124-A or J-2501-149-A) to facilitate the checking of the waveform of the BD board. The names and check items of each
terminal are as follows.
I+3V : For measuring the IOP (check if the optical pick-up laser has weakened)
IOP
: For measuring IOP (check if the optical pick-up laser has weakened)
TEO : TRK error signal (traverse adjustment)
VC
: Reference level for checking signals
RF : RF signal (jitter check)
[FORCED RESET]
Perform forced reset if the unit does not operate normally due to the hangup of the microprocessor.
It is recommended that this be performed when the test mode and retry cause display mode cannot be exited, or when the unit does not
operate normally when reassembled after being disassembled.
Method:Disconnect the power plug from the outlet, short-circuit the JW143 and 164 (RESET) of the MAIN board using a pair of tweezers,
and discharge the backup battery.
[MAIN BOARD] (Component Side)
JW143 JW164
IC401
CN307
IC101
CN110
6P connector
GND can not be used.
Mechanism deck
Jig
(J-2501-124A)
Jig
(J-2501-149A)
RF
VC
TEO
IOP
H-3V
RF
VC
TEO
IOP
I+3V
GND