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Chapter 3 Troubleshooting Display Messages
COIL HOT
One or more hammer coils
are overheating. Inspect
printer environment for
severity. The printer has
sensor circuits that sample
the operating temperature of
key components of the print
mechanism. When higher
than normal temperatures
are sensed, print speed is
automatically reduced by
50% and a COIL HOT
message is sent to the LCD
to inform the operator. When
the coil(s) cool down, print
speed automatically returns
to 100% and the message
clears from the LCD. This
message is normal for
extremely dense print jobs,
such as “All Black” plot. If the
printer often prints at half
speed, it may be operating in
a severe environment. A
severe environment is one
with an ambient temperature
at or above 40° Celsius
(104° Fahrenheit) or that is
dirty enough to create
blockage of the cabinet fan
vents. The printer must
never be run at ambient
temperatures greater than
40° Celsius (104°
Fahrenheit). If the printer is
located in such an
environment, relocate it to a
cooler, cleaner area.
1. Advise the user to move the
printer to cooler, cleaner location.
2. Check the kinds of print jobs the
user is running: look for very
dense graphics and layouts.
Advise the user to run jobs in
smaller batches.
3. Power off the printer. Remove the
paper path or pedestal top cover.
Check all fan cable connections.
4. Power on the printer. Verify that
all fans operate. Replace any fan
that does not operate.
5. Inspect vents and fan airways for
obstructions. Look underneath
cabinet models for items blocking
the cabinet exhaust vents.
Remove any obstructions from
vents and airways.
6. Install the paper path or pedestal
top cover. Load paper. Run the
“All E’s” print test for 5 to 10
minutes. If the message appears,
replace the shuttle frame
assembly.
7. Run the “All E’s” print test for 5 to
10 minutes. If the message
appears, replace the controller
board. Record the message and
return it with defective board.
8. If the printer is a 1500 lpm model
set the coil temperature (page
156).
Table 2. Message List
Message Explanation Solution
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