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Table 5-8. The LED Does Not Come On (2) (Continued)
Cause Step Checkpoint Finding Solution
The main motor coil may be
open or shorted.
2
Disconnect connector CN206
on the C169 MAIN-B Board,
and check the coil resistance
between: pin 1 and pin 2; pin 3
and pin 4 (2 points total) on the
disconnected cable side of the
connector, using a multimeter.
Pin 1 — Pin 2
Pin 3 — Pin 4
Are the resistances of all four
points approximately 10 ohms?
No
Replace the main
motor.
If any coil is shorted, check the
main motor drive circuit using
the following procedure:
1. Set the multimeter to
voltage.
2. Place the (–) terminal of
the multimeter on pins 1,
2, 3, or 6 of connector
CN206 on the C169
MAIN-B board.
3. Place the (+) terminal on
pin 2 of connector CN207
of the C169 MAIN-B Board
(GND).
With power on, does the
multimeter detect current?
Yes
Replace the C169
MAIN-B Board.
Paper take-up sensor flag
position may be incorrect.
3
Is paper take-up sensor flag
position incorrect?
Yes
Reseat the paper
take-up sensor flag.
Paper take-up roller may be
bad.
4
—
—
Replace the paper
take-up roller.
Troubleshooting EPL-5500 Service Manual
5-10 Rev. B