RA83/84/85/93/94/95 Series
Chapter 8
Operation Manual
Trouble Shooting And On Board Servicing
2. No response
N
Is Main Fuse F1 normal
(not blown)?
N
Correct the faulty connections.
Y
Y
N
Are the connections between
J11 on Processor Unit and
Operation Unit correct?
N
Main Logic PCB is faulty.
Y
N
Y
N
Y
Check if the status of LEDs on
the Main Logic PCB is as follows’
(1) DS1: ON
(2) DS2: ON
Are the following connections
correct?
(1) J701 (Main Logic PCB)
and Power Supply PCB
(2) J704 and Operation Unit
Is the voltage on J704-14
and 16 pins on Power
Supply PCB about 0 V
when the unit is powered?
Is “+5V” on J602-16
pin correct?
Y
Is the power supply voltage
range (21.6 – 41.6 V)
correct?
N
Y
Y
Is the fuse rating correct?
N
N
Y
Is the polarity of power
supply line correct?
Replace the fuse.
Correct the polarity.
Power supply unit is
faulty.
Set ship’s supply voltage
within the specified range.
Power supply PCB is
faulty.
Correct the faulty
connections.
Operation Unit is faulty.
Operation Unit is faulty.
93142105-02
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