Electrical Adjustment - Sony HCD-C770 Service Manual

6. VERSION INFORMATION
[6]
On the Test Mode Menu screen, selecting displays the ROM
version and region code.
The parenthesized hexadecimal number in version field is
checksum value of ROM.
## Version Information ##
IF con. Ver.x. xx
SYScon. Ver.x. xx (xxxx)
Model DAV-Cxxx
Region 0x
Front End Ver.x.xx
Exit: RETURN
IF con. : The version of system controller (IC901).
SYScon. : The version of DVD system processor (IC206).
Front End : The version of mechanism controller (IC301).
7. VIDEO LEVEL ADJUSTMENT
[7]
On the Test Mode Menu screen, selecting displays color bars
for video level adjustment. During display of color bars, OSD dis-
appears but the menu screen will be restored if pressing the
TURN]
key.
[RE-
ELECTRICAL ADJUSTMENTS
AUTO SERVO ADJUSTMENT
After parts related to the servo circuit (RF amplifier (IC001), DSP
(IC401), motor driver (IC501), EEPROM (IC302) so on) are re-
placed, re-adjusting the servo circuit is necessary. Select "ALL" at
"1. DRIVE AUTO ADJUSTMENT" (Refer to page 25 in TEST
MODE) and adjust DVD-SL (single layer), CD and DVD-DL (dual
layer).
31 31
HCD-C770/C990
SECTION 6
RF LEVEL CHECK
Connection:
oscilloscope
DVD board
CN301 1 pin +
–
CN301 3 pin
Procedure:
1. Connect an oscilloscope to test point 1 pin and 3 pin of
CN301 on the DVD board.
2. Turn the power on.
3. Put the disc (LUV-P01) (Part No.: 4-999-032-01) (CD) in to
playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
5. Put the disc (TDV-520CSO) (Part No.: J-2501-236-A) (DVD)
in to playback.
6. Perform confirmation in the same manner as step 4.
Note: A clear RF signal waveform means that the shape "◊" can be clearly
distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
CD: 1.05 ± 0.2 Vp-p
DVD: 1.09 ± 0.2 Vp-p
Checking Location:
– DVD Board (Component Side) –
CN301
7
1
Ver 1.6