Read Sony MDS-JE320 Service Manual online
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SECTION 1
SERVICING NOTE
JIG FOR CHECKING BD BOARD WAVEFORM
The special jig (J-2501-124-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.
performed are shown as follows.
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP
IOP
: For measuring IOP (Check the deterioration of the optical pick-up laser)
TEO : TRK error signal (Traverse adjustment)
VC
VC
: Reference level for checking the signal
RF
: RF signal (Check jitter)
FORCED RESET
The system microprocessor can be reset in the following way.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Method :
Disconnect the power plug, short-circuit jumper wire of JW70 and JW181.
Disconnect the power plug, short-circuit jumper wire of JW70 and JW181.
[MAIN BOARD] (Component Side)
Mechanism deck
CN110
RF
VC
TEO
IOP
I + 3V
Jig
(J-2501-124-A)
(J-2501-124-A)
Jumper wire
JW181
JW70
BT301
IC301
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