![background image](http://html.mh-extra.com/html/sony/cdm74hf-dvbu101/cdm74hf-dvbu101_service-manual_420235029.webp)
HCD-GZR5D
29
When the optical pick-up assy is replaced, perform the “Execute
IOP Measurement”.
Execute IOP Measurement (See page 23)
[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:
+
–
CN105 pin
(RFMON)
CN105 pin
(GND)
oscilloscope
DMB18 board
Procedure:
1. Connect an oscilloscope to CN105 pin 6 (RFMON) and CN105
pin 3 (GND) on the DMB18 board.
2. Turn the power on.
3. Set the test disc (refer to the TEST DISC LIST) on the tray and
press [
N
] button to playback.
4. Confi rm 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.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RFMON signal waveform
level: 0.58 ± 1.23 Vp-p (DVD)
0.57 ± 1.1 Vp-p (CD)
Checking Location:
DMB18 board (Side A)
IC102
IC101
IC104
CN105
CN105 pin
(GND)
CN105 pin
(RFMON)
1
6
DMB18 BOARD
(SIDE A)
Video Level Check (MAIN BOARD)
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
oscilloscope
set
J701
VIDEO OUTPUT
75
7
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
VIDEO SECTION
Summary of Contents for CDM74HF-DVBU101
Page 30: ...HCD GZR5D 30 MEMO ...
Page 101: ...MEMO HCD GZR5D 101 ...