Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer Service Manual page 126

Service Manual
EPL-9000
Table 5-11. The LCD Displays FEED JAM (2) (Continued)
Cause
The main motor coil may be
open or shorted.
The MCU PWB board maybe
The feed roller may be bad.
Rev. A
Step Checkpoint
Disconnect connector P/Jl 4
on the MCU PWB board
and check the coil
resistance between: pin 1
and pin 3; pin 1 and pin 5;
pin 2 and pin 4; and pin 2
and pin 6 (four points total)
on the disconnected cable
side of the connector, using
a multimeter.
Pin 1 — Pin 3
Pin 1 — Pin 5
Pin 2 — Pin 4
Pin 2 — Pin 6
Are the resistances of all
four points approximately 8
ohms?
2
If any coil is shorted, check
the main motor drive circuit
using the following
procedure:
1. Set the multimeterto
resistance check mode.
2. Place the (–) terminal of
the multimeter on pins 3,
5, 4, or 6 of connector
board.
3. Place the (+) terminal on
pin 8 of connector P/Jl 1
on the MCU PWB board
Does the multimeter detect
any current?
—
3
—
4
—
5
Troubleshooting
Finding Solution
Replace the main
No
motor.
Replace the MCL
Yes
Replace the MCU
Replace the REGI
sensor.
Replace the feed
roller.
5-7