Read Sony HCD-GZR333IA Service Manual online
HCD-GZR333IA
25
Checking Location: DMB19 board (Side A)
CN105 pin 3
(GND)
(GND)
CN105 pin 6
(RFMON)
(RFMON)
– DMB19 BOARD (SIDE A) –
IC104
CN105
CN1104
IC101
CN1
103
FM TUNE LEVEL CHECK
set
signal
generator
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
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 dBm (EMF)
ANT input : 35 dBm (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.
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.
“TUNED” is displayed.
TUNER 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.
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
J1502
VIDEO OUT
VIDEO OUT
75
:
+
–
–
Procedure:
1. Connect oscilloscope to VIDEO OUT jack.
2. Load a DVD reference disc playback.
3. Check the video signal level is 1.00±0.07Vp-p.
1. Connect oscilloscope to VIDEO OUT jack.
2. Load a DVD reference disc playback.
3. Check the video signal level is 1.00±0.07Vp-p.
1.00 ± 0.07 Vp-p
(WHITE 100%)
VIDEO SECTION
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