Alignment Procedures - Goodmans GMS950R Service Manual

FM AND AM RF ALIGNMENT CHART ( IF )
Step item
Unless otherwise specified set switches as follows:
FM Function: FM
Adjust generator frequency to a center of the FM band where no FM broadcast exists
IF
1
Adjustment
2
FM
Band setup
3
Tracking (1)
4
Tracking (2)
5
Repeat steps 3 and 4.
MW
IF
1
Adjustment
2
MW
Band
3
Tracking (1)
4
Tracking (2)
5
Repeat steps 3 and 4.
TAPE SECTION
HEAD ADJUSTMENT (AZIMUTH)
10 kHz test tape (example:MTT-114N) must be used for this adjustment. Connect to VTVM or oscilloscope to the head-
phone JCK or speaker terminal Press the play button.
Adjust the azimuth by using a screw driver to maintain the maximum L & R output voltage. Adjust tape. Please secure the
azimuth position by using locking paint.
RECODING BIAS OSCILLATOR FREQUENCY ADJUSTMENT
Connect the frequency counter to of R601 two ends.
Press REC button of tape .
Adjust T201 obtain 60 kHz +-100 HZ

ALIGNMENT PROCEDURES

Input Circuit Output Circuit
Setup
Connect FM IF Connect Co19 and GND
sweep output IF-OUT terminal to
terminal to IC102 IF sweep input terminal
Headphone jack or
speaker terminal
FM SG ANT. Headphone jack or
Terminal 90.1 MHz, speaker terminal
1kHz, +-22.5kHz dev
106.1 MHz, 1 kHz Headphone jack or
+-22.5 MHz dev speaker terminal
Connect standard loop Connect input terminal
antenna to output ter- genescope to detector
minal of genescope output
Headphone jack or
speaker terminal
612 kHz 400 kHz, Headphone jack or
30% mod speaker terminal
1404 kHz 400 kHz, Headphone jack or
30% mod speaker terminal
Tuner
Setup setting
FM in band
end
87.5 MHz
108MHz
90.1 MHZ
MONO
106.1 MHz
MW in band
end
522 kHz
1620 kHz
612 kHz
1404 kHz CT131
Adj - Adjustment
Point
Adjust for straight and
T101 symmetrical S-curve
with max.amplitude.
L103 Adjust L103 for max output
Done
L102 Adjust for max.output and
best waveform
CT101 Same as above.
Adjust tor max. amplitude
T131
with symmetrical 450 kHz.
L135 Adjust L135 for max output
Done
L106 Adjust for max.output and
best waveform
Same as above.
5