Kongsberg Simrad RA83 Instruction Manual page 142

RA83/84/85/93/94/95 Series
Operation Manual
No transmit
Waveform on TP2
A
B
Pulse length A(ns) B(ms)
SP 100 0.5
M1 200 0.67 or 0.77
M2 550 1 or 1.25
LP 1050 2 or 2.5
Manual tuning is faulty
93142105-02
Is the Mod-HT fuse F3
normal (not blown)?
Is +250
(Modulator PCB) normal?
Is the trigger signal on TP2
5 V
(Modulator PCB) normal?
0 V
Is any buzz heard from the
Pulse Transformer?
Is 6.3 V applied to the
magnetron heater?
Is +24V supply on J1-1 (IF
Amplifier) normal?
Does the voltage on J2-3 (IF
PCB) vary from 6 V to 9 V?
Is +5 V supply on J2-2 (IF
PCB) normal?
Trouble Shooting And On Board Servicing
N
Y
N
V on J2-1
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
Chapter 8
Modulator PCB is faulty.
Check for cable connection
between antenna and processor.
Modulator PCB is faulty.
Modulator PCB is faulty.
Internal wiring in the Antenna
unit or Power Supply in the
Processor unit is faulty.
The magnetron is faulty.
Internal wiring in the Antenna
unit or Power Supply in the
Processor unit is faulty.
IF PCB is faulty.
IF PCB or LNFE module is faulty.
LNFE module is faulty.
8-15