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KV-S1058Y/KV-S1028Y/KV-S1057C-M2/J2/KV-S1027C-M/J2
1.3.
Troubleshooting-1 (when no error message is displayed on PC)
Change from the Original Service Manual as Section 11.1.
Symptom
Possible Cause
Recommended action
LED does not light
up.
up.
1. Power cord is not inserted correctly.
Insert the power cord correctly.
2. Cables in the scanner are not
connected properly. (especially around
Power Supply)
Power Supply)
Insert the cables properly.
3. Power Board does not work, properly.
1. Measure the following voltage on CONTROL Board.
CN21 4-5th pin: +24V
2. Check the connection between the Control Board and
Power Board.
3. Replace Power Board.
4. Power Switch on LCD PANEL Board
does not work, properly.
1. Check the following connection.
(1) CN4000 (LCD PANEL Board) and CN10 (CONTROL
Board)
(2) FFC Cable
2. Measure the following resistance value, when the power
cord is unplugged.
(1) CN4000 10th pin – GND : 0 Ω (SW4007 ON)
(2) CN4000 10th pin – GND : over 10kΩ (SW4007 OFF)
(1) CN4000 10th pin – GND : 0 Ω (SW4007 ON)
(2) CN4000 10th pin – GND : over 10kΩ (SW4007 OFF)
3. Replace SW4007 or LCD PANEL Board.
5. Boot program of this scanner does not
work, correctly.
Replace CONTROL Board
6. DC ON/OFF circuit on CONTROL
Board does not work correctly.
1. Monitor the following signals. (when turning on the power)
(1) Q51-G : Typ. 12 V
(2) Q48-C : Typ. 11 V
(3) Q50-B : Typ. 0.6 V
(4) +7.0V (CL189) : Typ. 7V
(2) Q48-C : Typ. 11 V
(3) Q50-B : Typ. 0.6 V
(4) +7.0V (CL189) : Typ. 7V
2. Check the soldering condition of the following parts and of
their surrounding circuits on the CONTROL Board.
Q48, Q50, Q51
Q48, Q50, Q51
3. Monitor the following signals.
(1) Q48 (C-E) : Typ. 0 V
(2) Q50 (C-E) : Typ. 0 V
(2) Q50 (C-E) : Typ. 0 V
4. Replace faulty parts.
7. CONTROL Board does not work
properly.
1. Perform the "LED" test in Sec.
10.3.8.
to check the LED
ON/OFF status.
2. Check whether all connections and cables on the
CONTROL Board are normal.
3. Check the soldering condition of the following parts and of
their surrounding circuits on the CONTROL Board.
(1) +1.2V (CL196) : Typ. 1.2V
(2) +7V (CL189) : Typ. 7.0V
(3) +3.3V (CL190) : Typ. 3.3V
(4) IC9 (PF4)
(5) IC6 (Reset IC)
(1) +1.2V (CL196) : Typ. 1.2V
(2) +7V (CL189) : Typ. 7.0V
(3) +3.3V (CL190) : Typ. 3.3V
(4) IC9 (PF4)
(5) IC6 (Reset IC)
4. Check the soldering condition of the following parts on the
CONTROL Board.
(1) CN10
(1) CN10
5. Monitor the following signals.
CN10-8th pin : +3.3V
6. Replace faulty parts or CONTROL Board.
8. LCD PANEL Board does not work
properly.
1. Perform the "LED" test in Sec.
10.3.8.
to check the LED
ON/OFF status.
2. Check the following connection.
between CN4000(LCD PANEL Board) and CN10
(CONTROL Board)
(CONTROL Board)
3. Check the soldering condition of the following parts on the
LCD PANEL Board.
(1) CN4000
(2) IC4000
(1) CN4000
(2) IC4000
4. Monitor the following signals on the CN4000.
CN4000-3pin : +3.3V
5. Replace faulty parts or LCD PANEL Board.
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