MDC-7000/7900 Series
Chapter 5 Troubleshooting and on board repair
0092669002-07
5-21
Yes
Yes
No
Control PCB
failure
No
Error message “Head line
signal abnormal.
” is
displayed.
Is “synthesized bearing
signal pulse” in the control
PCB TP8 normal?
(See the figure above.)
Is “heading signal
pulse” in the control
PCB J3-3 normal?
3 msec
Failure of wiring in antenna
unit, or failure of Display unit
Reed switch failure
1.2 msec
Heading signal
Bearing signal
5 V
2.5V
0V
Is “bearing signal pulse”
of control PCB J3-2 Pin
normal?
Yes
Yes
No
No
Error message “Azimuth
abnormal.
” is displayed.
Is “synthesized bearing
signal pulse” of control
PCB TP8 Pin normal?
Modulator PCB
failure
Failure of wiring
in antenna unit,
or failure of
Display unit
Failure of
brushless motor
TP8 synthesized
bearing signal pulse
10 ms
0 V
5 V
No
Failure of photo
interrupter in DC
motor
RB808/RB809
RB807
Summary of Contents for MDC-7006
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Page 44: ...Chapter 3 installation method MDC 7000 7900 Series 3 24 0092669002 07 Unit mm inch MRM 108 ...
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Page 155: ...0092669002 07 A 1 INTER CONNECTION DIAGRAM RB807 ...
Page 156: ...A 2 0092669002 07 INTER CONNECTION DIAGRAM RB808 ...
Page 157: ...0092669002 07 A 3 INTER CONNECTION DIAGRAM RB809 ...
Page 158: ...A 4 0092669002 07 INTER CONNECTION DIAGRAM MRD 108 MRO 108 ...
Page 159: ...0092669002 07 A 5 INTER CONNECTION DIAGRAM MRM 108 MRO 108 ...
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