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PAMS
Technical Documentation
NSE–3
Disassembly & Troubleshooting Instructions
Page 28
Original, 11/97
Transmitter Fault (1)
T
ransmitter
Fault
TXLEV
5
N620 pin 8(J542)
232 MHz SL: –28 dBm
N620 pin 61 and 62,
1
16 MHz SL: –40 dBm
VHFLO
N620: TXQP
, TXQN,
TXIP
and
TXIN, OK ?
Check TXQP
, TXIP
, TXQN,
TXIN
lines
from
COBBA
pin 13...16 and
soldered joints at N620 and N250,
if OK change N250(T
est pins J558
& J560)
N620 pin 63(J514),
VTX–pulse
OK ?
Check
VTX supply voltage
from CCONT
N620 pin 58, ~1.5V
Check
VREF_1 – line
N620 pin 59,
loading 15 k
Ω
Check R635 and soldered
joints
N620 pin 61 and 62, ~0.8V
Change N620
N500 pin2(J552) and pin3
(J550)
1
16 MHz SL: –32 dBm
N500 pin 2 and 3,
loading > 1M
Ω
Check N500 pin 2 and
3 for short circuits, if
OK change N500
Check C652, C653, C655,
L623, L624, R623, R625, if OK
change N500
N500 pin 12(RX–Continous),
SL: –28 dBm
UHFLO
N500 pin 30,
SL: –18 dBm
N500 pin 1 and 29,
~2.8V
Check
VTX supply voltage
from CCONT
N500 pin 16,
~1.5V
Check
VREF_2 – line(J518)
N500 pin 20,
loading 10 k
Ω
Check R504 and soldered
joints
Change N500
T
ransmitter
1
N620 pin 1,
TXP–pulse OK?
Check TXP–line from MAD
N620 pin 1
1,
TXC–pulse
OK?
Check TXC–line from COBBA
TXQP
, TXIP
, TXIN,
TXQN,
TXP
and VTX:
Oscilloscope pictures in
Appendix C
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Summary of Contents for NSE-3 SERIES
Page 3: ...NSE 3 SeriesTransceivers PAMS Technical Documentation Original 11 97 Chapter 1 Foreword ...
Page 7: ...NSE 3 Series Transceivers PAMS Technical Documentation Original 11 97 Chapter 3 System Module ...
Page 80: ...PAMS Technical Documentation Original 11 97 Chapter 4 UI Module UE4 ...
Page 83: ...PAMS Technical Documentation UI Module UE4 Page 4 4 Original 11 97 Baseband Block Diagram ...
Page 99: ...UIF Module UE4 Original 11 97 4 A3 4 Layout Diagram of UE4 Version 10 ...
Page 100: ...PAMS Technical Documentation Original 08 96 Appendix 1 TRANSCEIVER NSE 3NX ...
Page 139: ...PAMS Technical Documentation Original 11 97 HFU 2 ...
Page 146: ...PAMS Technical Documentation HFU 2 Page 8 Original 11 97 Exploded View of HFU 2 3 2 4 5 1 ...
Page 153: ...PAMS Technical Documentation HFU 2 Page 15 Original 11 97 This page intentionally left blank ...
Page 154: ...PAMS Technical Documentation Original 11 97 CARK 64 Installation Guide ...
Page 158: ...PAMS Technical Documentation CARK 64 Page 5 Original 11 97 This page intentionally left blank ...
Page 159: ...PAMS Technical Documentation Original 11 97 CARK 91 Installation Guide ...
Page 167: ...PAMS Technical Documentation CARK 91 Page 9 Original 11 97 This page intentionally left blank ...
Page 168: ...NSE K B 3 Series Transceivers PAMS Technical Documentation Original 11 97 Service Tools ...
Page 193: ...NSE 3 System Module UP8T Original 11 97 3 A3 1 Block Diagram of System RF Blocks ...
Page 203: ...NSE 3 Series Transceivers PAMS Technical Documentation Original 11 97 Tuning Instructions ...