Examples Of Trouble; Internal Circuits - JRC JMA-5212-4/6 Service Manual

6.3. Examples of Trouble

6.3.1. Internal Circuits

The radar display flickers on and off
Description
The radar is operating normally, but the radar display appears and disappears at intervals.
Location of cause o
Connection
Input voltage
The power cannot be turned on.
Description
Pressing the power switch does not start the equipment.
Location of cause o
Circuit breaker
Input voltage
The cursor cannot be operated with the trackball.
Description
The cursor cannot be moved by operating the trackball.
Location of cause o
Setting
Trackball
Procedure
A connector may not be connected correctly. Check the connection of
the RGB connector (J7) and LCD power connector (J6).
The input voltage may be too low. Check the voltage.
Procedure
Check that the circuit breaker is turned on.
The protection circuit may be activated because the input voltage is too
high. (Preset protective voltage +42 VDC)
Check the voltage.
Procedure
Check that the equipment is not in a mode for operation with the EBL or
VRM control.
To return to the ordinary operation mode, hold down EBL.
If operation with the EBL or VRM control is also impossible, replace the
trackball.
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