MDC-2200/2500 Series
Chapter 6 Troubleshooting and on-board repair
0092625002-07
6-7
6.3 Malfunction diagnostics
This chapter specifies necessary information required troubleshooting and repair of the radar
system.
6.3.1 Malfunction detection step
As a first step of on-board repair, refer to the following tables describing outlines of malfunction
diagnostics procedure.
Table 6.5 basic malfunctions
Failure status
Possible cause
Measure
No power.
1. Power cable is disconnected.
2. Supply power is out of range.
3. Main power fuse is blown.
1. Connect power cable firmly
and secure connector.
2. Use proper power source.
3. Change fuse to new one.
Power is applied but no
display
1. Screen brilliance is adjusted to the
minimum.
2. Failure of LCD unit
3. Failure of LCD driver unit
1. Rotate brilliance knob clockwise
to adjust properly.
2. Request repair.
3. Request repair.
Table 6.6 possible malfunctions
Error status
Possible cause
Measure
Picture is dark.
1. Adjustment of display brilliance is
incorrect.
2. Failure of LCD driver circuit
1. Press [Brilliance] key and
adjust to proper brilliance.
2. Request repair
No radar picture is
displayed.
1. Receiver is detuned.
2. Video contrast adjustment error
3. Failure of transceiver
1. Readjust by referring to
chapter [4.1.3].
2. Readjust by referring to
chapter [4.5].
3. Request
repair
Picture is too weak.
1. Receiver is detuned.
2. Failure of Magnetron or MIC
(front-end)
1. Readjust by referring to
chapter [4.1.3].
2. Request
repair
Markers (Heading, EBL,
VRM, Range Rings,
Parallel index, Alarm
range) are not
displayed.
1.
Improper marker brilliance
adjustment.
2. Failure of Logic PCB
1. Readjust by referring to
chapter [4.5].
2. Request
repair
Heading line is not
displayed.
1. No heading line signal input.
1. Check [BP/HG] signal between
an Antenna unit and a Display
unit.
Antenna does not
rotate.
1. Motor fuse is blown.
2. Motor power is not supplied.
3. Motor brush is worn out.
1. Replace fuse to a new one.
2. Check
motor
power
connection.
3. Replace motor brush to a new
one.
Summary of Contents for MDC-2200 series
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