16
an optional thermistor overload protection, the tail light circuits are overload protected (thermistors are lo-
cated on the bottom of the component side of the P.C. Board).
This repair instruction is intended to assist qualified repair personnel to diagnose, remove, repair and
reinstall monitors, which have become inoperative due to a variety of conditions.
REPAIR PROCEDURE
NOTE:
Field repair is not intended for monitors covered by Blue Bird Body Company warranty. Inoperative
monitors under warranty should be returned to Blue Bird Body Company for repair or replacement under
the terms and conditions of warranty for electrical parts.
Step 1: MOST IMPORTANT! Carefully note and record exactly which monitor lamps are not operating prop-
erly. Include this information on a tag to be attached to the monitor after removal from the bus panel.
Step 2: Disconnect bus battery.
Step 3: Remove mounting screws, which attach the monitor to the bus panel, being careful not to accidently
pull any connecting wires loose.
Step 4: Remove one connecting wire at a time from monitor terminals, tagging EACH WIRE with the termi-
nal number shown on the monitor.
Step 5: If a spare monitor is to be installed at this point, record the monitor serial number for your future
reference. The number is shown on both the protective fiberboard back plate and on the monitor
printed circuit board.
Step 6: With the monitor removed from the bus and to a repair bench, remove the four nuts to remove the
monitor PC board from the face plate. Pull the protective fiberboard backing from the terminals, being
careful not to bend or tear it; retain for later use.
Step 7: Locate the components to be replaced by referring to Diagram of Coils and Reed Switches on Page 16.
Locate the solder points for these components.
Step 8: Replace the inoperative coil/reed switch assembly as follows:
a. With wire clippers cut the reed switch leads (2) and the coil leads (2) as close to the board surface,
as possible. (If a tail lamp monitor is to be replaced, pull the protective shield loose and retain for
reuse later).
b. With soldering iron, CAREFULLY melt-out the remaining coil and reed switch leads from the
solder side of the board, pulling gently on the leads with tweezers. With the lead stubs removed,
touch the holds in the PC board with soldering iron to "clear" them for replacement
lead insertion.
c. Insert replacement coil and reed switch leads, guiding them into proper holes with index finger
and thumb. Hold coil snug to the board while leads are bent over the solder side of the board. It is
recommended that excess leads not be clipped until after soldering is completed. This will help to
minimize shock or vibration on the reed switch, when leads are later trimmed. (Reed switches are
encased in a fragile envelope and should be handled carefully to avoid chipping of envelope or
distortion of leads).
d. Place a bead of solder on the remaining lead ends, being careful not to interfere with other nearby
solder points or PC paths.
Step 9: If a tail lamp has been replaced, clean the original sealant from the protective shields and reinstall
with new Silicone rubber sealant as recommended.
Step10:Visually examine all other components, leads, PC paths and LED’s for any remaining problems to be
corrected. Reinstall monitor in bus, making sure battery is disconnected and that wires are recon-
nected to the monitor in the same order as shown in chart on page 18.
If additional instructions are needed after following the above procedure, contact Blue Bird Body Company.
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Страница 111: ...Part Number 1919331 Blue Bird Corporation P O Box 937 Fort Valley GA 31030 ...