Main Adjustment - JVC XV-521BK Service Manual

Main adjustment

Adjustment and confirmation matter
(1) Auto adjustment method
If microprocessor (IC401, IC402, IC714, IC716) or pick up is replaced, initialize
the DVD player in the following matter:
1. Initialize the DVD player in the following matter:
1) Make sure that no disc is on the tray.
2) Insert the power pulag to the outret while pressing "PLAY" and "OPEN/CLOSE" button at the
same time.
FL Display indicate "TEST
3) Press Enter button. And EEPROM initialize start.
4) When indicate "96kHz EEPROM" on the display , initialize finished.
Note : During the EEPROM initialization the keys may not be operated.
Press the "POWER" key to initiate the STAND-BY mode and the test mode will then
be cancelled.
(2) Confirmation of DVD RF level
1.The oscilloscope is connected between "1"(RFOP) of
CN104 and "2"(GND).
2.Reproduction of the test disc ( VT-502)
made by JVC.
3.It is confirmed that RF LEVEL is 350mVp-p
4.When there is disorder in the waveform road cuts etc,
test disk is exchanged and measured.
(3) Confirmation of CD jitter level and RF level
1. The CD jitter meter is connected between "11"(GND)
of CN104 and "12"(FLTOUT).
The RF level is observed at the same time.
2. The first test disk(CTS-1000) made of JVC is reproduced.
3. It is confirmed that RF LEVEL is 360
5. When there is disorder in the waveform road cuts
etc, test disk is exchanged and measured.
; Version.
150mVp-p.
100mVp-p.
XV-521BK/523GD/525BK/421BK
"12" "11" "2"
FLTOUT GND GND
12 ~
CN104
DVD SERVO CONTROL PWB
FRONT SIDE
"1"
RFOP
1
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