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MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series Chapter 8
Operation Manual
Trouble Shooting And On Board Servicing
93142122-07
8-5
2. No response
N
Y
Y
N
Y
N
N
Y
N
Correct the faulty connections
Y
N
Main Logic PCB is faulty
Operation Unit is faulty
Y
N
Y
N
Operation Unit is faulty
Y
Is Main Fuse F1 normal
(not blown)?
Is the fuse rating correct?
Replace the fuse
Is the polarity of power
supply line correct?
Correct the polarity
Power supply unit is
faulty
Is the power supply voltage
range (21.6 – 41.6 V)
correct?
Set ship’s supply voltage
within the specified range
Is “+5V” on J602-16
pin correct?
Is the voltage on J704-14
and 16 pins on Power
Supply PCB about 0 V
when the unit is powered?
Power supply PCB is
faulty
Are the following connections
correct?
(1) J701 (Main Logic PCB)
and Power Supply PCB
(2) J704 and Operation Unit
Correct the faulty
connections
Check if the status of LEDs on
the Main Logic PCB is as follows’
(1) DS1: ON
(2) DS2: ON
N
Are the connections between
J101 on Display Unit and
Operation Unit correct?
Y