This service manual helped me to repair my PIONEER. Iam very satisfied, that I found it here.
Even the price of manual was not so high that person would not be able to spend a few money.
But that is very worth spent money. Thanks
I was very glad recieving the service manal from You. Additionaly very fast. Extremaly nice servicing. Thanks very mach! Now my GX-220 working better, than it was made. Alexander from Moscow, Russia/
Text excerpt from page 24 (click to view)
4. Confirmation of the RF level
Test point: RF and VC (Vref) Test disc: TCD-782 Confirm that the RF waveform appears as shown below.
At 0.8 Vp-p or greater
VOLT/DIV: 200mV TIME/DIV: 0.5us
5. Confirmation of tracking balance
Test point: TE and VC (Vref) Test disc: TCD-782 Press the DSL button while the test disc is playing and confirm that the traverse waveform is as is shown below.
VC
VOLT/DIV: 200mv TIME/DIV: 2ms
6. Confirmation of each servo
It is possible to confirm the adjustment value of each servo by repeatedly pressing the MODE button while the test disc is playing. The switchover sequence is as stated below. Confirmation mode OFF -> Focus bias (FB) -> Tracking balance (TB) -> Tracking gain (TG) -> Tracking error offset (TEO) -> Focus gain (FG) -> Focus error offset (FEO) -> Confirmation mode OFF Example: Tracking error offset (TEO) Adjustment value-> 03