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HCD-GPX5G/GPX7G/GPX8G
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-
ed.
3. Use an oscilloscope with more than 10 MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specifi ed value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
oscilloscope
(DC range)
DMB22 board
CN507 pin 6 (RFMON)
CN507 pin 3 (GND)
Procedure :
1. Connect the oscilloscope to CN507 pin 6 (RFMON) and
CN507 pin 3 (GND) on the DMB22 board.
2. Press the [
STANDBY] button to turn the power on, and
?/1
press the [CD/DISC SKIP] button to select CD function.
3. Set disc (YEDS-18) and press the [u] button to playback.
4. Confi rm that oscilloscope waveform is as shown in the fi gure
below (eye pattern).
A good eye pattern means that the diamond shape () in the
center of the waveform can be clearly distinguished.
Checking Location:
-DMB22 Board (SideA)-
pin 6
(RFMON)
IC504
CN507
IC501
pin 3
(GND)
22
All manuals and user guides at all-guides.com
SECTION 4
ELECTRICAL CHECK
+
–
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.05 ± 0.45 Vp-p
0 dB = 1 μV
TUNER SECTION
FM AUTO STOP CHECK
set
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM an-
tenna input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
: 75 kHz
Modulation
: 1 kHz
ANT input
: 35 dBu (EMF)
Please use 75 ohm "coaxial cable" to connect SG and the
Note:
set. You cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with
automatic scanning.
4. Confi rm that input Frequency of A, B and C detected and auto-
matic scanning stops.
The stop of automatic scanning means "The station signal is re-
ceived in good condition".
signal
generator
+
75
–
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