Goodmans GMS880, Service Manual

Page: 6 / 59

ALIGNMENT PROCEDURES
5
FM AND AM RF ALIGNMENT CHART IF
Step Item Input Circuit Output Circuit Tuner Adj - Adjustment
Setup Setup setting Point
Unless otherwise specified set switches as follows:
FM Function: FM
Adjust generator frequency to a center of the FM band where no FM brodcast exists
IF Connect FM IF Connect C519 and GND FM in band T201 Adjust for straight and
˄ Adjustment sweep output IF-OUT terminal to end T503 symmetrical S-curve
terminal to IC501 IF sweep input terminal Adjust with max.amplitude.
˅ FM Headphone jack or 87.5 MHz L502 Adjust for max output
Band speaker terminal 108.5MHz PVC201-FC1 Adjust for max output
FM SG ANT. Headphone jack or 90 MHZ L501 Adjust for max.output and
ˆ Tracking (1) Terminal 90 MHz, speaker terminal MONO best waveform
1kHz, +-22.5kHz dev
ˇ Tracking (2) 106 MHz, 1 kHz Headphone jack or 106MHz PVC201-FC2 Same as above.
+-22.5 MHz dev speaker terminal
ˈ Repeat steps 3 and 4.
AM
IF Connect standard loop Connect input terminal AM in band Adjust tor max. amplitude
˄ Adjustment antenna to output ter- genescope to detector end ˧ˈ˃˅ with symmetrical 455kHz.
minal of genescope output
˅ AM Headphone jack or 520 kHz T505 Adjust for max output
Band speaker terminal 1630 kHz PVC201-C2 Adjust for max output
ˆ Tracking (1) 600 kHz 400 kHz, Headphone jack or 600 kHz L506 Adjust for max.output and
3% mod speaker terminal best waveform
ˇ Tracking (2) 1400kHz 400 kHz, Headphone jack or 1400 kHz PVC201-C1 Same as above.
3% mod speaker terminal