Electrical Adjustments - Philips ST-D777ES Service Manual

All the settings are performed in the Factory Preset state. (Refer to page 13.)
Precautions in Repairing
If the front end unit fails, it is difficult to repair the inner circuits, so
replace the entire front end unit.
FM SECTION 0dB = 1µV
FM RF SSG
FM ANTENNA (75Ω)
•
Standard Setting of FM Stereo RF Signal Generator.
STEREO STANDARD SIGNAL
Carrier frequency : 98MHz
Modulation : Audio 1kHz
Main channel (L+R) : 33.75kHz
deviation
Sub channel (L–R) : 33.75kHz
deviation
Pilot : 7.5kHz
Deviation
14
SECTION 3

ELECTRICAL ADJUSTMENTS

1kHz
distortion meter
highpass
filter
set
LINE OUT
MONAURAL
STANDARD SIGNAL
Carrier frequency : 98MHz
Modulation : Audio 1kHz
75kHz deviation
FM Discriminator ADJUSTMENT
(NULL and MONO Distortion Adjustment)
Setting:
FM RF SSG
FM ANTENNA (75Ω)
Modulation : Monaural Standard signal
Output level : 6mV (76dB) (at 75 Ω open)
Digital Voltmeter
(DC range)
TP201
NULL terminal
Procedure:
1. Tune the set to 98 MHz.
2. Adjust IFT202 for 0V reading on the digital voltmeter.
................... NULL
3. Adjust IFT203 for a minimum reading on the distortion meter.
................... MONO Distortion (THD)
4. Repeat the adjustments of 2 and 3 several times.
Note : When replacing the ceramic filter, perform this alignment.
1kHz
distortion meter
highpass
filter
set
LINE OUT