Faultfinding Chart - Koden MDC-1840BB Operation Manual

Chapter 8
Trouble Shooting And On Board Servicing
Description of faults
Aerial does not rotate

8.3.2 Faultfinding chart

The following faultfinding charts are prepared for a service engineer to allow him to
diagnose and locate a faulty part on a module basis. The charts are systematically
arranged from primary fault analysis to finding a path to a detailed flow chart that
follows.
1. Fault analysis
Start
Turn the system on
Does the display turn
on?
Y
Does the display switch to
STANDBY mode?
Transmit the radar
Is the echo shown on
the screen?
Y
Are key switches or
control operative
normal manner?
Y
Is the entire screen
presentation normal?
Other faults
8-4
MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Possible cause of failures
1. Motor fuse is blown.
2. Turning motor is not powered.
3. Turning motor brushes are worn
out.
N
Does a short beep
sound?
N
Is any error message shown
N
in North-up, Course-up or
True Motion mode?
N
in
N
Is the fault connected
with external serial data?
Corrective measures
1. Replace the motor fuse
2. Check the connections for
3. Replace
N
Y
N
Y
N
Y
Operation Manual
with new one.
motor power supply line.
the motor
brushes.
Go to "2. No response"
Go to "3. No display"
Go to "4. Antenna does
not respond"
Go to "5. Faulty radar picture"
Go to "6. Fault Interface"
Go to "7. Fault Panel"
Go to "8. Others"
Go to "9. Antenna faults"
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