Hallicrafters SX-117, Repair Manual

Page: 18 / 51

18
5-4, AUXILIARY CRYSTAL OSCILLATOR TEST
The following assumes the normal configuration, that is without any axillary crystals installed.
This procedure is an optional operation. The object is to prove the operation of the auxiliary
even though it is most likely not in use. If the auxiliary sockets are populated select each
installed crystal in order and perform steps c through g. Otherwise:
a, Pull the 80-meter crystal, Y8 and install in auxiliary socket 1.
b, Set the XTAL SELECTOR switch to position 1
c, Power up, any mode. RF and AF GAIN at min.
d, Connect scope probe to the junction of C57 and the terminal strip.
e, The signal level should be 10vpp.
f, Move the probe from the scope to the frequency counter.
g, it should read the crystal frequency.
5-4-1, AUXILIARY OSCILLATOR SCHEMATIC & VOLTAGE CHART
PIN # 1 2 3 4 5 6 7 8 9
VOLTAGE 170 0 130 6.3vac 0 55 2.0 33 47
Measurements taken with 80-meter xtal plugged into Aux socket 1 and XTAL SELECTOR in position 1. Switch the OFF/NL/CAL switch
to the CAL position, tune for a zero beat to ensure the aux oscillator is working. You will need an RF blocking probe.