Power Supply Trouble; The Copier Does Not Turn On - Konica Minolta bizhub 164 Service Manual

Field Service Ver. 2.0 Jun. 2010

15. POWER SUPPLY TROUBLE

15.1 The copier does not turn ON

Step
1 A malfunction code appears when the power
switch is turned ON.
2 The malfunction is temporarily reset when the
power switch is turned OFF and ON with the
Back/Stop/Reset key held down.
3 Power supply voltage check
<Check procedure>
Check voltage across pins of DC power supply
(DCPU) when the power switch is turned ON.
• Voltage across CN1DCPU-1 and CN1DCPU-
2 AC0 V when the power switch is OFF
Rated AC voltage when the power switch is
turned ON
4 Check of output of DC24 V to PRCB
<Check procedure>
Check voltage across a PRCB pin and GND
when the power switch is turned ON.
• Voltage across CN5PRCB-1 and GND
• Voltage across CN5PRCB-3 and GND
DC0 V when the power switch is OFF
DC24 V when the power switch is turned ON
5 Check of output of DC 3.3 V to PRCB
<Check procedure>
Check voltage across a PRCB pin and GND
when the power switch is turned ON.
• Voltage across CN5PRCB-7, 8 and GND
DC0 V when the power switch is OFF
DC3.3 V when the power switch is turned ON
6 Check of output of DC3.3 V to control panel
<Check procedure>
Check voltage across a PRCB pin and GND
when the power switch is turned ON.
Voltage across P103PRCB-8, 9 and GND
DC0 V when the power switch is OFF
DC3.3 V when the power switch is turned ON
Check
15. POWER SUPPLY TROUBLE
Result Action
YES • Go to step 2.
NO • Go to step 3.
YES • Perform the troubleshooting pro-
cedure according to the malfunc-
tion code.
NO • Check wall outlet for voltage.
• Check power cord for continuity.
• Check power switch.
NO • Check front door switch (SW3).
• Check right door switch (SW2).
• Change DC power supply
(DCPU).
NO • Change power supply unit
(DCPU)
NO • Change printer control board
(PRCB).
• Change DC power supply (DCPU)
YES • Change control panel.
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