108
7. Paper Feed Motor control circuit
does not work, properly.
1. Check the following connection and
soldering condition on each connector.
→ CN1002 (CONTROL Board) to CN4002
(DRIVE Board)
2. Check the soldering condition of IC4008 and
its surrounding parts.
3. Check the following signals on the
DRIVE Board.
a. IC4008-12th pin (CLK)
See Fig. 2.
b. IC4008-19th pin (VREF): 2.5 V or less.
c. IC4008-15th pin (ENABLE): 0 V
(when executing Feed Motor test)
4. Check the soldering condition of IC0006 and
IC0015 on the CONTROL Board to repair it.
5. Replace faulty parts or boards.
U12 (Conveyor Jam1:
Paper did not reach the
Slip Detect Sensor.)
12 00 00 00 1. Document remains between
Waiting Sensor and Slip Detect
Sensor.
Remove the document from the scanner.
2. Paper dust exists on or around
the Slip Detect Sensor.
1. Blow off the dirt with the accessory blower.
(See Sec.7.)
2. Execute Key/Sensor and Sensor
Sensitive Level tests in Sec.9.3.6 to check
the sensor condition.
3. Slip detect sensor does not
work, correctly.
1. Execute Key/Sensor test in the Sec. 9.3.6 to
check the sensor condition.
2. Check the sensor alignment is proper.
(whether the sensor direction faces to its
reflector)
3. Check the following connection and
soldering condition on each connector.
a. CN2013 (SLIP DETECT SENSOR Board)
to CN3008 (BENT RELAY Board)
b. CN3005 (BENT RELAY Board) to CN2007
(USS RELAY Board)
c. CN2006 (USS RELAY Board) to CN1008
(CONTROL Board)
4. Check the following signals.
a. IMP_START signal (CN2007-11th pin,
CN1008-3rd pin)
→ 0 V (when nonexistence on the Slip
Detect Sensor)
b. Check the reference signal for the
IMS_START signal on the CONTROL
Board.
IC0024-3rd pin: 1.5 V or less
IC0026-2nd pin: Approx 1.5 V
c. Check comparator output signal.
→ IC0017-7th pin: 3.3 V
(when no document exists)
6. Replace faulty parts or boards.
4. Mechanical problem (Drive
Roller, Drive Belt, Conveyor)
1. Execute Feed Motor and Conveyor Motor
tests in Sec. 9.3.6 to check the mechanical
condition.
2. Check whether the Drive Rollers
(especially Drive Roller 1), the Drive belt, and
the conveyor to support the Drive Rollers are
put together into the scanner, properly.
3. Check the surfaces of the Drive Roller (1).
a. Configuration:
Do the rollers swell irregularly?
→ Replace the roller.
b. Whether the roller surface is dirty
→ Clean the surface.
4. Check whether the Drive Belt tension is
proper.
→ Re-adjust the belt tension.
Error Code Possible Cause Check Point Remarks
Classified Code ST1 ST2 ST3 ST4
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