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- continued -
2-1
CHAPTER 2 MAINTENANCE
1. FUSE REPLACEMENT
To protect the unit from serious damage, four 2A fuses are provided on a P.C. board. The fuses
protect against overvoltage or internal fault of the equipment. If a fuse blows, find the cause of
the problem before replacing it.
CAUTION
Do not use a fuse rated more than 2A, since it may cause more
serious damage to the equipment.
2. MINOR TROUBLESHOOTING
Operating problems are most likely caused by loose connectors or wrong setting of DIP switches.
The table below provides simple troubleshooting which can be done by the operator.
Symptom Possible Cause Remedy
No display *Dimmer control turned
fully CCW.
*Gyrocompass not on.
*External power supply is
turned off.
*Flat cable between the two
P.C. Board is loose.
*Blown fuse.
*No power because of wrong
jumper setting.
*Gyrocompass not connected.
*Turn the control
clockwise.
*Turn on the power..
*Turn on the power.
*Reconnect.
*Check supply voltage.
Replace fuse.
*Correct JP1, JP4 and JP5
to the right setting.
*Connect gyrocompass.
Display is fixed
on “000.0”.
*DIP switch SW1 is set wrong. *Correct the setting.
No data output *Loose data output connector.
*JP6 and/or JP7 not connected.
*Tighten the connector.
*Connect JP6 and JP7.
Bearing display is
frozen.
*Hold function is turned on. *Press HOLD key to release
the HOLD function.
A value between “000.0”
and “359.9” flashes.
*Power fail detection or Stator
signal breaking detection is
activated.
*Check the connection with
the Gyrocompass.
*Press COUNT-UP or
COUNT-DOWN key to
match the AD-100
indication with the
Gyrocompass indication,
and then press HOLD key.
“999.9” flashes *Stator signal breaking detection
is activated.
*Check the connection with
the Gyrocompass.