Electrical Adjustments - Sony HCD-RG55 Service Manual

TUNER SECTION
AM IF Adjustment
AM RF Signalgenerator
75 Ω coaxial
30% amplitude
Modulation by
400Hz signal
Output level : as low as possible
set
PHONES jack(JK801)
Procedure:
1. Set the frequency of the AM RF signal generator to 1000 kHz
(at 10 kHz step) or 999 kHz (at 9 kHz step).
2. Tune the set to AM 1000 kHz (at 10 kHz step) or 999 kHz (at 9
kHz step).
3. Adjust IFT101 so that the reading on level meter becomes in
maximum.
FM Tuned Level Adjustment
FM RF Signalgenerator
75 Ω coaxial
Carrier frequency : 98MHz
Modulation : AUDIO 1kHz,75kHz
deviation (100%)
Output level : 28dB (at 75 Ω open)
Procedure:
1. Supply a 98 MHz signal at 28 dB from the ANTENNA
terminal.
2. Tune the set to 98 MHz.
3. Adjust RV101 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
SECTION 5

ELECTRICAL ADJUSTMENTS

set
AM ANTENNA terminal
(JK101)
level meter
16 Ω
set
FM ANTENNA terminal
(JK101)
Null Adjustment
FM RF Signalgenerator
75 Ω coaxial
Carrier frequency : 98MHz
Modulation : AUDIO 1kHz,75kHz
deviation (100%)
Output level : 60dB (at 75 Ω open)
Procedure:
1. Supply a 98 MHz signal at 60 dB from the ANTENNA
terminal.
2. Tune the set to 98 MHz.
3. Measure voltage between pin 21 and pin 23 of IC 101. Adjust
T101 ubtil the voltage becomes 0 V.
Adjustment Location: MAIN board
Adjustment Location:
MAIN BOARD Component side
T101:NULL
RV101: FM TUNED LEVEL
IFT101:AM IF
HCD-RG55/RG55S
set
FM ANTENNA terminal
(JK101)
21