Koden MDC-7006, Installation Manual

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Chapter 5 Troubleshooting and on board repair MDC-7000/7900 Series
5-8 0092669002-07
5.3 Malfunction diagnostics
This chapter specifies necessary information required troubleshooting and repair of the radar system.
5.3.1 Malfunction detection step
As a first step of on board repair, refer to the following tables describing outlines of malfunction
diagnostics procedure.
Table 5.2 basic malfunctions
Failure status Possible cause Measure
No power. 1. Power cable is disconnected.
2. Operation unit cable is
disconnected.
3. Supply voltage is out of range.
4. Main power fuse is blown.
1. Connect power cable firmly
and secure connector.
2. Connect operation cable
firmly and secure connector.
3. Use proper power source.
4. Change fuse with new one.
Power is applied but no
display
1. Display brilliance is adjusted to the
minimum.
2. Connector of internal cable is
disconnected.
3. Failure of LCD unit or Backlight
power PCB
1. Adjust properly.
2. Confirm by a serviceman.
3. Request repair.
Table 5.3 possible malfunctions
Error status Possible cause Measure
Display brilliance is
dark.
1. Adjustment of display brilliance is
incorrect.
2. Failure of LCD driver circuit
3. Failure of Backlight power PCB
1. Adjust properly.
2. Request repair
3. Request repair
No radar echo is
displayed.
1. Receiver is detuned.
2. Video contrast adjustment error
3. Failure of transceiver
1. Readjust by referring to
“4.1.1
Tune adjustment
”.
2. Readjust by GAIN, SEA or
FTC knobs.
3. Request repair
Radar echo is too weak. 1. Receiver is detuned.
2. Failure of Magnetron or MIC
(front-end)
1. Readjust by referring to
“4.1.1
Tune adjustment
”.
2. Request repair
Error message “Head
line signal abnormal.” is
displayed.
1. No heading line signal input. 1. Check [BP/HG] signal between
an Antenna Scanner unit and a
Display unit.
Antenna does not
rotate.
1. Motor fuse is blown.
2. Motor power is not supplied.
3. Inter-switch mode is difference.
1. Replace fuse with a new one.
2. Check motor power
connection.
3. Set inter-switch mode to
master mode.