HCD-GZR7D/GZR8D/GZR9D
39
Checking Location:
DMB18 board (Side A)
IC102
IC104
IC101
IC201
CN105
CN401
DMB18 BOARD (SIDE A)
CN105 pin
(GND)
CN105 pin
(RFMON)
CN110
SECTION 6
ELECTRICAL ADJUSTMENTS
When the optical pick-up assy is replaced, perform the “Execute
IOP Measurement”.
Execute IOP Measurement (See page 35)
[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 [
Y
] 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.
RFMON signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
level: 0.58 ± 1.23 Vp-p (DVD)
0.57 ± 1.1 Vp-p (CD)
FM Tune Level Check
set
signal
generator
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM
antenna input directly.
Carrier frequency: A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
: 75 kHz
Modulation : 1 kHz
ANT input : 35 dB
μ
(EMF)
Note:
Use 75 ohm coaxial cable to connect signal generator and
the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C
signals.
When the selected station signal is received in good condition,
“TUNED” is displayed.
DVD SECTION
TUNER SECTION
