PAMS
Technical Documentation
NSE–3
Disassembly & Troubleshooting Instructions
Page 30
Original, 11/97
Transmitter Fault (3)
Power
Control
TXLEV5
Transmitter working OK
N250 pin 11,
TXC – pulse OK
Transmitter
Fault
Check TXC – line from N250
pin 17, if OK change N250
N620 pin 11 and 12 pulses
are about the same
V550 anode,
DC–voltage ~0.8V
Check VSYN_1 voltage
through R550, R551 and R552
N620 pin 12,
loading ~4 k
Ω
Check C632, if OK
change N620
Check C554, R553 and
R554, if OK change V550
TXC – pulse:
Oscilloscope picture in Appendix D
YES
YES
YES
YES
NO
NO
NO
NO
NO
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