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A particular LED on the Doran Warning Light Monitor™ does not display, but the
bus running lights are operating properly:
1. There is an open coil in the monitor
• The coil is burned due to an overload. Replace the coil kit.
• A solder joint has weakened (a cold solder joint). Flow new solder on the
connection.
• The reed switch has failed. The reed has broken or the contacts have failed.
Replace the reed switch kit.
• The printed circuit board is broken or burned. Replace the printed circuit
board.
• There is an open in the LED circuit. Replace the LED.
A monitor LED indicator is on but, the bus running light indicated is not op-
erating, or the bus running light switch is in the off position and the monitor
indicates the running lights are operating:
• Replace the coil and reed switch kit.
Neither the bus running lights nor the Doran Warning Light Monitor™ operate
properly:
1. The running light bulb may be burned out. Replace the light bulb.
2. The overload thermistor has protected the circuit from overload. Remove the
overload condition.
• A short
• Incorrect light bulb/s
• Extra lights; i.e., trailer lights, etc.
Calibration
To self calibrate the monitor, ALL monitored lights must be in working order. For
faster calibration, the operator may turn on as many exterior lights as possible at the
start of the procedure. The operator will be required to activate these lights during
the calibration procedure. Operator may begin with the tail/head lights on, hazard
lights (for the turn signals), and the amber warning lights flashing (door closed).
1. Turn on ignition and start engine – Engine is running to assure proper volt-
age for operation and calibration. The GREEN LED voltage indicator at the
bottom center of the monitor MUST BE ILLUMINATED indicating the voltage
is within limits for proper operation. Before beginning calibration, allow time
for the voltage to stabilize to its normal running voltage. After cranking the
engine the battery voltage may be lower than normal. Allow time for the
battery to recharge.
2. When the ignition is turned on, all LED's on monitor will be enabled for a few
seconds to verify that all LED's are working.
3. To enter the calibration mode, press and hold the calibrate button through
the face plate hole for longer than two (2) seconds. This button/hole may
be found located at the bottom left corner of the bus image on the monitor
face plate. The first light to calibrate will begin flashing when the unit enters
calibration mode. You may use an object such as an allen wrench or paper
clip to activate the switch.
98
DRIVER'S HANDBOOK
[CAUTION] Do not attempt
to check a light emitting diode
(LED) with an ohmmeter. Some
digital volt meters (DVM) have a
diode checking position, which
is acceptable to test LEDs. Any
repair of the Doran Warning Light
Monitor™ should be referred to a
qualified technician.
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