Electrical Adjustments - Sony HCD-GNZ55D Service Manual

HCD-GNZ55D
Ver. 1.2
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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:
DMB15 board
CN105 pin 6 (RFMON)
CN105 pin 3 (GND)
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Procedure:
L 13942296513
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.
RFMON signal waveform
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SECTION 5

ELECTRICAL ADJUSTMENTS

oscilloscope
+
–
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 0.58 ± 1.23 Vp-p (DVD)
0.57 ± 1.1 Vp-p (CD)
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Checking Location: DMB15 board (Side A)
DMB15 BOARD (SIDE A)
IC102
IC101
CN106
CN105 pin 6 (RFMON)
VIDEO SECTION
Video Level Check (VIDEO BOARD)
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
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adjusted correctly, the brightness will be too large or small.
set
J1902
VIDEO OUTPUT
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.
(WHITE 100%)
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IC104
IC201
6 1
CN105
CN105 pin 3 (GND)
0 5 8 2 9 9 4 2 8
oscilloscope
75 Ω
1.00 ± 0.07 Vp-p
m
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