RA83/84/85/93/94/95 Series
Chapter 8
Operation Manual
Trouble Shooting And On Board Servicing
93142105-02
8-13
Modulator PCB is faulty.
N
Y
N
Y
N
Y
N
Modulator PCB is faulty.
Y
N
Y
Modulator PCB is faulty.
Pulse selection function is
faulty
Is the TX drive signal on
TP2 (Modulator PCB)
normal?
Is +24V present on J1-1 pin
(Modulator PCB) normal?
Internal wiring in the Antenna
unit or Processor unit is faulty.
Antenna does not rotate
Replace the fuse
with new one.
Finished
Is the fault corrected?
N
Can the antenna be rotated
manually?
Check if the following conditions
are observed:
1) The antenna gets caught
with a rope.
2) Turning gear mechanism
gets stuck.
Is the Motor Fuse F2 normal (not blown)?
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
0 V
5 V
Waveform on TP2
B
A
○
1
Motor is faulty.
N
Y
Disconnect P4 (J4) from the
Modulator PCB. Is the fault
removed?
Internal wiring in the Antenna
unit or Processor unit is faulty.
Disconnect J2 from the
Modulator PCB. Is the fault
removed?
+250 V line is shorted
Internal wirings in the Antenna
unit or Power Supply in the
Processor unit is faulty.