Electrical Adjustments - Sony HCD-RV222D Service Manual

HCD-RV222D/RV222DL/RV333D/RV333DL/RV555D
TUNER SECTION 0 dB = 1 μV
[FM TUNE LEVEL CHECK]
SET
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM an-
tenna input directly.
* Carrier Freq : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Please use 75 ohm "coaxial cable" to connect SG and the set. You
cannot use video cable for checking.
Please use SG 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.
The mark of "TUNED" means "The selected station signal is re-
ceived in good condition."
26
SECTION 4

ELECTRICAL ADJUSTMENTS

[RF LEVEL CHECK]
FM signal generator
OUT (75 )
Procedure:
1. Connect an oscilloscope to CN105 pin 6 (RFMON) and
2. Turn the power on.
3. Load a disc (HLX-503 (J-6090-069-A)) and playback.
4. Confi rm that oscilloscope waveform is clear and check if RF
Note: Clear RF signal waveform means that the shape "◊" can be clearly
Connecting Location: DMB19 board
DVD SECTION
DMB19 board
CN105 pin 6 (RFMON)
CN105 pin 3 (GND)
CN105 pin 3 (GND) on the DMB19 board.
signal level is correct or not.
distinguished at the center of the waveform.
RFMON signal waveform
– DMB19 BOARD (SIDE A) –
IC101
IC104
CN105
CN105 pin 3
CN105 pin 6
(GND)
(RFMON)
oscilloscope
+
–
VOLT/DIV: 100 mV
TIME/DIV: 500 ns
level: 0.5 ± 0.3 Vp-p
CN1104