Chapter 8
RA83/84/85/93/94/95 Series
Trouble Shooting And On Board Servicing Operation
Manual
3. No display
N
Y
Are the cable connections
between J709, 729 (Main
Logic PCB) and LCD
Monitor correct?
Y
N
Check if the status of
LEDs on the Main Logic
PCB is as follows’
1) DS1:
ON
2) DS2:
ON
Correct the faulty cable connections.
Main Logic PCB is faulty.
LCD Monitor unit is faulty.
4. Antenna does not respond
N
N
Is the error message
“ANTENNA NO
RESPONSE” shown on
the screen?
Y
Y
Y
Is +12V on J701-20 pin
and GND normal?
Performance Monitor is faulty.
Y
Modulator PCB or Main Logic
PCB is faulty.
Are the antenna cable
connections at Antenna and
Processor units correct?
N
Is +5V on J5-12 pin in
Modulator Unit normal?
Modulator PCB is faulty.
Modulator PCB is faulty.
N
Y
Y
Is +12V present at
J2-2 in Antenna unit?
N
Y
Y
Disconnect Modulator
Connector J6 and
check if +12V on
J711-3 pin is normal.
Disconnect
Modulator
Connector J4
and check if
+12V at J711-3
pin becomes
normal.
N
Connect J1
N
N
Disconnect Antenna
Connector J1 and check
if +12V on J701-20 pin
becomes normal.
Power Supply PCB is
faulty.
Main Logic PCB is faulty.
Modulator PCB
is faulty.
Correct faulty connections.
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