If. Test Procedure.

b. If. Test Procedure.

c. Rf Chart (fig. 65). A f t e r the tests

with the FREQUENCY RANGE-MC switch

listed in b above show that the trouble is

at the 20-70 rnc position; then check the

n o t in the if. amplifier and if. step at-

70- to 220-mc band with the FREQUENCY

t e n u a t o r , proceed with the tests listed in

RANGE-MC switch at the 70-220 mc posi-

the chart below. Use tuning unit 2 signal

tion. In each case, tune the frequency dial

generator (para 65) with 400-cps modula-

on tuning unit 2 to the frequency of tuning

t i o n . First, check the 20- to 70-mc band

unit 2 signal generator.

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