24
HCD-GNZ77D/GNZ88D
SECTION 5
ELECTRICAL ADJUSTMENTS
VIDEO SECTION
Video Level Check (VIDEO BOARD)
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
Procedure:
1. Connect oscilloscope to VIDEO output.
2. Load a DVD reference disc playback.
3. Check the video signal level is 1.00±0.07Vp-p.
DVD SECTION
When the optical pick-up assy is replaced, perform the “Execute
IOP Measurement”.
Execute IOP Measurement (See page 21)
[TEST DISC LIST]
Be sure to use the DVD disc that matches the signal standards of
your region.
• CD
YEDS-18 (Part No.: 3-702-101-01)
PATD-012 (Part No.: 4-225-203-01)
• DVD SL (Single Layer)
NTSC : HLX-503 (Part No.: J-6090-069-A)
HLX-504 (Part No.: J-6090-088-A)
PAL
: HLX-506 (Part No.: J-6090-077-A)
• DVD DL (Dual Layer)
NTSC : HLX-501 (Part No.: J-6090-071-A)
HLX-505 (Part No.: J-6090-089-A)
PAL
: HLX-507 (Part No.: J-6090-078-A)
[RFMON Level Check]
Connection:
Procedure:
1. Connect an oscilloscope to CN105 pin
6
(RFMON) and
CN105 pin
3
(GND) on the DMB15 board.
2. Turn the power on.
3. Set the test disc (refer to the TEST DISC LIST) on the tray
and press
H
button to playback.
4. Confirm that oscilloscope waveform is clear and check
RFMON signal level is correct or not.
Note:
A clear RFMON signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
Checking Location: DMB15 board (Side A)
+
–
CN105 pin
6
(RFMON)
CN105 pin
3
(GND)
oscilloscope
DMB15 board
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RFMON signal waveform
±
1.23 Vp-p (DVD)
±
1.1 Vp-p (CD)
IC102
IC101
IC104
IC201
CN105
CN106
CN105 pin
3
(GND)
CN105 pin
6
(RFMON)
1
6
DMB15 BOARD (SIDE A)
oscilloscope
set
J1902
VIDEO OUTPUT
75
Ω
1.00
±
0.07 Vp-p
(WHITE 100%)
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