Konica Minolta 7115 Service Manual page 257

Step Check
4 Power supply voltage check
<Check Procedure>
Check voltage across pins of DC Power Sup-
ply (PU1) when the Power Switch is turned
ON.
• Voltage across CN1PU1-1 and CN1PU1-3
AC0 V when the Power Switch is OFF
Rated AC voltage when the Power Switch is
turned ON
5 Check of output of DC24 V to Control Board
(copier: PWB-C)
<Check Procedure>
Check voltage across a Control Board (copier:
PWB-C) pin and GND when the Power Switch
is turned ON.
• Voltage across JP15C-1 and GND
• Voltage across JP15C-2 and GND
DC0 V when the Power Switch is OFF
DC24 V when the Power Switch is turned
ON
6 Check of output of DC24 V to Master Board
(copier: PWB-A)
<Check Procedure>
Check voltage across a Master Board (copier:
PWB-A) pin and GND when the Power Switch
is turned ON.
• Voltage across PJ2A-2 and GND
DC0 V when the Power Switch is OFF
DC24 V when the Power Switch is turned
ON
7 Check of output of DC 5 V to Master Board
(copier: PWB-A)
<Check Procedure>
Check voltage across a Master Board (copier:
PWB-A) pin and GND when the Power Switch
is turned ON.
• Voltage across PJ21A-1 and GND
DC0 V when the Power Switch is OFF
DC24 V when the Power Switch is turned
ON
8 Check of output of DC5 V to control panel
(UN2)
<Check Procedure>
Check voltage across a Control Board (copier:
PWB-C) pin and GND when the Power Switch
is turned ON.
• Voltage across JP4C-1 and GND
DC0 V when the Power Switch is OFF
DC5 V when the Power Switch is turned ON
Result
NO • Check wall outlet for volt-
age.
• Check power cord for con-
tinuity.
• Check Power Switch.
NO • Check Front Door Inter-
lock Switch (S3).
• Check Right Door Inter-
lock Switch (S4).
• Change DC power Supply
(PU1).
NO • Check Front Door Inter-
lock Switch (S3).
• Check Right Door Inter-
lock Switch (S4).
• Change DC power Supply
(PU1).
NO • Change DC power Supply
(PU1).
NO • Check Control Board
(copier: PWB-C).
• Change Master Board
(copier: PWB-A).
• Change DC power Supply
(PU1).
YES • Change control panel
(UN2).
T-41
Action