Read Panasonic KV-N1058X / KV-N1028X / KV-N1058Y / KV-N1028Y (serv.man2) Service Manual Supplement online
3
KV-N1058X/KV-N1028X/KV-N1058Y/KV-N1028Y
1.2.
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 or LCD does not
display normally.
up or LCD does not
display normally.
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 PANEL SWITCH
Board does not work, properly.
1. Check the following connection.
(1) CN5000 (PANEL SWITCH Board) and CN3001 (LCD
PANEL Board)
(2) CN3000 (LCD PANEL Board) and CN11 (CONTROL
Board)
(3) FFC Cable
2. Measure the following resistance value, when the power
cord is unplugged.
(1) CN5000 9th pin – GND : 0 Ω (SW5001 ON)
(2) CN5000 9th pin – GND : over 10kΩ (SW5001 OFF)
(1) CN5000 9th pin – GND : 0 Ω (SW5001 ON)
(2) CN5000 9th pin – GND : over 10kΩ (SW5001 OFF)
3. Replace SW5001 or PANEL SWITCH Board or LCD
PANEL Board.
5. USB cable between LCD PANEL Board
and Control Board is not connected
normally.
normally.
1. Re-attach the USB cable between JK3000 (LCD PANEL
Board) and JK2 (Control Board), and then restart the
scanner.
scanner.
2. Replace the USB cable.
6. USB interface circuit on LCD PANEL
Board does not work.
Check the soldering condition of the following parts and of
their surrounding circuits on the LCD PANEL Board, and
then repair it.
their surrounding circuits on the LCD PANEL Board, and
then repair it.
(1) JK3000 (USB IF connector)
(2) LF3000 (Common mode filter)
(3) IC3003 (LCD controller)
(2) LF3000 (Common mode filter)
(3) IC3003 (LCD controller)
7. USB interface circuit on Control Board
does not work
Check the soldering condition of the following parts and of
their surrounding circuits on the Control Board, and then
repair it.
their surrounding circuits on the Control Board, and then
repair it.
(1) JK2 (USB IF connector)
(2) LF3 (Common mode filter)
(3) IC9 (PF4)
(2) LF3 (Common mode filter)
(3) IC9 (PF4)
8. 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.
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