Radio Shack PRO-2035 Service Manual page 15

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48.5 MHz and 10.7 MHz WFM IF CoU Alignment
Control Setting Test Instrument Connection
Adjust Result
OFFNOLUME control: ON. Conneet the signal generator to T3 1. Set the signal generator fre-
SQUELCH control: CCW. the ANT jack, and the osclllo-
T4 quency to 520 MHz (FM: 22.5
Select channel 5.
scope, AC SSVM, distortion kHz dey. at 1 kHz and the
meter, and 8-ohm load to the output at SIN 20 dB point).
EXT SPKR jack. See Figure 5.
2. Adjust T3 and T4 lor maxi-
mum sensitivity.
48.5 MHz 2nd IF CoU Alignment
Control Setting Test Instrument Connection Adjust Result
OFFNOLUME control: ON. Conneet the signal generator to
T2 1.
Set the signal generator Ire-
SQUELCH control: CCW.
the ANT jack, and the oscillo- T6 quency to 120 MHz (AM: 60%
Select channel 6. scope, AC SSVM, distortion modo at 1 kHz and the output
meter, and 8-ohm load to the at SIN 20 dB point).
EXT SPKR jack. See Figure 5.
2. Adjust T2 and T6 lor maximum
sensitivity.
455 kHz IF Coil Alignment
Control Setting Test Instrument Connection Adjust Result
OFFNOLUME control: ON. Conneet the signal generator to T7 1. Set the signal generator
tre-
SQUELCH control: CCW. the ANT jack, and the oscillo- quency to 120 MHz (AM: 60%
Select channel 6. scope, AC SSVM, distortion modo at 1 kHz and the output
meter, and 8-ohm load to the at SIN 20 dB point).
EXT SPKR jack. See Figure 5.
2. Adjust T7 lor maximum sensi-
tivity.
455 kHz AM Detector Coil Alignment
Control Setting Test Instrument Connection Adjust Result
OFFNOLUME control: ON. Conneet the signal generator to T8 1. Set the signal generator Ire-
SQUELCH control. CCW. the ANT jack, and the oscillo- quency to 120 MHz (AM: 60%
Select channel 6.
scope,
AC SSVM, distortion
modo at 400 Hz and the out-
meter, and 8-ohm load to the
put at 100 I-lV).
EXT SPKR jack. See Figure 5.
2. Adjust T8 lor minimum THD
point.
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