Pulsar TC-10B, User Manual

Page: 103 / 190

3. Press and hold either the “LL” or “HL”
button on the keying module until the TTL
module LED indicates “ALARM &
LOCKOUT”.
4. Check the start and stop time on the
timer/counter.
5. Press the “ALARM & LOCKOUT RESET”
button on the transmitter. Turn the “ON
TIME LIMIT ADJUST” CW to increase
the “ON TIME” and CCW to decrease.
6. Repeat steps 3-5 until the desired timing is
obtained.
11.4 Transmitter
Troubleshooting
Should a fault occur in this module, place the
module on an extender board. Check the RF
output (30 - 535 kHz) on pins A/C-28. If there is a
Voice Key or AM voice input, use an oscilloscope
to examine the modulation envelope. You can
check the ac and dc voltages provided on the
schematic (Figure 11-4) at the appropriate points,
for the conditions on the schematic (10W, 1W, and
Voice).
You can check all diodes, resistors, chokes and
transistors by conventional means.
October 2003 Page 11–5
Chapter 11. Transmitter Module
11
NOTE:
On Transmitter units, style no.
1610C01G03 (TTL), the auxiliary board
can be removed when troubleshooting
the bottom main board.