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NO
Z505 output,
Check Z505 output for short
loading > 1 M Ω
circuits, if OK change Z505
Change Z505
NO
N550 pin 2,4,6,12,13 and 14
Check VBATT–connections to
N550
NO
N550 pin 1 and 16,
Check soldered joints
at N550
NO
Check soldered joints at N550
power control pulse
and N620, if OK change N620
C564,C505,C566,C572,C555,C
567,L552, if OK change N550
VTX and power contol pulse(TXC):
Oscilloscope pictures in Appendix D
Transmitter
1
TXLEV5
Z505 input,
SL: – 23 dBm
YES
NO
Z505 output,
SL: –29 dBm
YES
YES
N550 pin 8,
SL: –29 dBm
YES
NO
N550 pin 13,
~3.6V
SL: –2 dBm
YES
YES
Duplexer TX–pin,
VTX–pulse
SL: 6 dBm
YES
YES
N550 pin 9,
YES
Check
RF–connector X540 pin 1,
SL: 5 dBm
NO
NO
Z505 input,
loading > 1 M Ω
YES
Check C700
Check V640 limiter circuit
DC–levels(VTX–voltage),
NO
Base: ~0.6V
Collector: ~0.6V
Emitter: ~0.3V
Check components in line
NO
from N550 to Z550. Also
check for short circuits, if OK
change Z550
NO
Check X540, if OK change
Z550
Check Z505 input for short
circuits, if OK change Z505
Check R668, R662, R664,
R666, R670, C660, C662
and C562, If OK change
V640
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