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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/
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Sweet! I won the item on eBay and couldn't adjust the geometry or even keep a steady picure. This guide has the full schematics (not available anywhere else as far as I could tell), and was a bargain for the wealth of knowledge it contains. I hooked it up to my testing equipment, tweaked a few potentiometers and got it playing videogames in no time. Thanks!
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It was just what I need to fix my old BMW's CD player. Very convenient also. Thank you.
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Great Manual! It contains all the wiring schematics and mechanical exploded views that are essential for service and repair. I was surprised I even found this for such an old machine. Only wish I knew of this site many years ago.
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Great manual very clear copied. You are making an incredible job. I appreciate a lot the rapidity and your efficiency. Thanks a lot
The LCD will change as follows. Example: Test disc: TCD-782, DISC type select: CD-d, Judgement value: 7F, Measurement value: 3D BE.
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
Judgement value Measurement value *All numerical values are displayed in HEX What disc the IC has selected can be understood according to this judgment value. The decision standard of IC is as follow. LCD displays �CD-d� 0 < Judgment value < 10 10 < Judgment value < 32 32 < Judgment value < C8 C8 < Judgment value No disc CD-RW CD-DA and CD-R LCD displays �CD-r� No disc No disc CD-RW CD-DA and CD-R Tracking error offset (TEO) display Adjustment value *Adjustment values are displayed in HEX.
The state of the FE waveform can also be understood from this judgment value. 3. Confirmation of sled movement By pressing the F. SKIP or B. SKIP button continuously when all LCD light up, it is possible to transfer the pick-up to either the outer circumference or the inner circumference (the LCD is to remain all light up). 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.
ADJUSTMENT
< TUNER SECTION >
1. DD converter clock adjustment Settings : � Test point : Q204 Collector � Ajustment location: TC208 Method : Set to AM603 kHz and adjust TC208 so that the test point becomes 360kHz. At 0.8Vp-p or greater 2. AM VT Check Settings : � Test point : TP1 (VT) Method : Set to AM 530kHz(AU,ALH), 531kHz(Other) and check that the test point is 1.0V ± 0.5V and set to AM 1710kHz(AU,ALH), 1602kHz(Other) and check the test point is 7.5V ± 1.0V(AU,ALH), 6.5V ± 1.0V (Other). 3. AM Tracking Adjustment Settings : � Test point : HP OUT (VOLUME MAX) � Adjustment location : BAR ANTENA................................600kHz(AU,ALH) BAR ANTENA................................603kHz(Other) TC801..............................................1400kHz(AU,ALH) TC801..............................................1404kHz(Other) * Repeat this adjustment a few times until the wave shape has the maximum amplitude. 4. AM IF Adjustment IFT803.........................................999kHz(Other) IFT803.......................................1404kHz(AU,ALH) 5. FM VT Adjustment(Lower side) Settings : � Test point : TP(VT) � Adjustment location : L801 Method : Set to FM 87.5MHz and adjust L851 so that the test point becomes 1.5 ~ 2.0V. 6. FM Tracking Adjustment Settings : � Test point : HPOUT (VOLUME MAX) � Adjustment location : L802................................................87.5MHz * Repeat this adjustment a few times until the distortion is minimum.
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
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