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AIWA XPV321
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of AIWA XPV321 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 12 (click to view)
TEST MODE-2/3
The servo circuit of this model has been designed to be free of adjustments and controlled within the IC. Therefore, adjustments and disk judgement are performed automatically every time the TOC is read out. The adjustment status of each servo inside the IC can be monitored in this test mode.

1. Startup procedure
1) Short the test land. 2) Insert the AC plug. 3) Press the STOP button. (The test mode starts.) Note 1) The test mode is canceled by disconnecting the AC plug. Note 2) The OPEN/CLOSE switch cannot be operated during the test mode.

2. Checking the RF level
Test point: RF & VC (Vref) Test disk: TCD-782 Play back the disk and confirm that the RF waveform is in the following state:

0.8Vp-p or more

VOLT/DIV:200mV TIME/DIV:0.5us

3. Checking each servo
The adjustment values of each servo can be checked by pressing the MODE button repeatedly during playback. The switching procedure is as follows. Check mode OFF™Vref offset (RO)™focus offset (FO)™tracking offset (TO)™tracking balance (TB)™tracking gain (TG) ™ focus gain (FG)™focus bias (FB)™check mode OFF Example: Tracking offset (TO) Adjustment value™F5

RNDM

RESUME 1 DSL

Tracking offset

Adjustment value

* Adjustment values are indicated in hexadecimal. When displaying each mode on the LCD and pressing the PLAY button in the STOP status, the center value is displayed on the LCD. After the disk starts rotating, the adjustment value that was set during automatic adjustment is displayed. The display range of the center values and adjustment values of each mode are as follows. There are 256 steps for displaying the values of all modes. Center value 1) Vref offset (RO) 2) Focus offset (FO) 3) Tracking offset (TO) 4) Tracking balance (TB) 5) Tracking gain (TG) 6) Focus gain (FG) 7) Focus bias (FB) Center value 00 00 00 80 40 40 00 Display range 80-7F 80-7F 80-7F 00-FF 00-FF 00-FF 80-7F

-12-

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