Philips KV-S5055C Service Manual page 112

Error Code
Classified Code ST1 ST2 ST3 ST4
U23 (Double-feed 1C
error)
Possible Cause
00 xx 00 1. Document quality is out of spec.
on this scanner.
2. Rollers (Paper Feed,
Separation, DFP) are not
assembled, properly.
3. Rollers (Paper Feed,
Separation, DFP) are dirty.
4. Rollers have reached their life
expectancy.
5. Double Feed Detector (G) does
not work, properly.
Check Point
1. Set the correct documents on the Hopper
according to this scanner specification.
Note: Refer to Sec.2.
1. Reassemble the rollers.
1. Clean the rollers.
2. Clear counter for cleaning roller to zero with
the above service utility.
1. Replace the Paper Feed, Separation,
and DFP Rollers after checking each
roller configuration and Scanner Counter
of Service Utility software.
2. Clear counter for replacing roller to zero with
the above service utility.
1. Execute Double Feed test in Sec. 9.3.7 to
adjust "Send Level" for Double Feed
Detectors.
2. Execute Double Feed test in Sec. 9.3.6 to
check the detector condition.
3. Check whether the Double Feed Detector is
aligned property.
4. Check the following connection and
soldering condition on each connector.
a. CN2011 (USS / WAITING SENSOR
Board) to CN3009 (BENT RELAY Board)
b. CN3005 (BENT RELAY) to CN2007
(USS RELAY Board)
c. CN2006 (USS RELAY Board) to CN1008
(CONTROL Board)
5. Check the following parts' soldering condition
to repair it.
a. CONTROL Board
IC0006-43rd pin
IC0015-21,23,24, and 27th pins)
b. USS RELAY Board
IC2008-3, 15, 18, 20, 22, 24, and 27th pins
Q2001 to Q2008 surrounding circuit.
6. Check the following signals
a. DC 24V signal (CN2006-5th pin)
b. JS_CLK (CN2006 9th pin) → 300 kHz
c. USS / WAITING SENSOR USS+
(CN2011-7th pin) and
USS-(CN2011-8th pin)
→ See Fig. 7.
7. Replace faulty parts or boards.
112
Remarks