TB 9-6625-1997-24
b. Adjustments. No further adjustments can be made.
14. Distortion
a. Performance Check
(1) Connect audio analyzer to INT MOD-OUT.
(2) Set FUNCTION switch to 150 HZ and adjust DEVIATION control for a full-
scale indication on DEVIATION KHZ meter at each setting. If audio analyzer does not
indicate within the limits shown in first row of table 10, perform b below.
(3) Repeat technique of (2) above for switch settings listed in table 10. If analyzer
does not indicate within limits specified, perform b below.
Table 10. Distortion
Test instrument
FUNCTION
Audio analyzer
switch setting
distortion
(Hz)
displayed
150
<4%
400
<4%
1000
<4%
b. Adjustments
(1) Set FUNCTION switch to 150 HZ.
(2) Connect audio analyzer to E29 on audio board (located left rear on bottom of
chassis), using probe.
(3) Adjust R15 (located on left end of chassis) for minimum distortion (R).
(4) Lock adjustment in place. Voltage indication at E29 will be approximately 2.5 V
rms, as indicated on audio analyzer.
(5) Repeat paragraph 13 if (3) above was performed.
15. Modulation Deviation
a. Performance Check
and cable No. 2.
(2) Position controls as listed in (a) through (e) below.
FUNCTION switch to 150 HZ.
(a)
RF TUNING control for frequency of 22 MHz.
(b)
RF OUTPUT switch to 500 KUV.
(c)
DEVIATION RANGE-kHz switch to 10.
(d)
LO HI RF SET TO LINE control for red line on RF SET TO LINE meter.
(e)