Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer Service Manual page 128

Service Manual
Table 5-12.
Cause
or shorted.
The MCU PWB
board maybe
bad.
The REGI sensor maybe bad .
Table 5-13. The LCD Displays PAPER JAM
Cause
The REGI sensor maybe
bad.
sensor may be
The EXIT
bad.
Rev. A
The LCD Displays FEED JAM (3) (Continued)
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?
If any coil is shorted, check
the main motor drive circuit
using the following
procedure:
1. Set the multimeter to
resistance check mode.
2. Place the (-) terminal of
the muitimeter 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 —
Checkpoint
Step
—
—
Troubleshooting
Solution
Finding
Replace the main
No
motor.
Replace the
Yes
Replace the MCU
—
Replace the REGI
—
sensor.
Replace the feed
—
roller.
at Power On
Solution
Finding
Replace the REGI
—
sensor.
Replace the EXIT
—
sensor.
5-9