Oki Data CONFIDENTIAL
42930511TH Rev. 2 189 /
1 Power is turned on and the printer doesn't work properly.
• Turn off power and on again.
• Does the backlight light up (for approx. one second)?
• NO Is the AC cable connected properly?
NO Connect the AC cable properly.
• YES Is the power supply indicator LED of the Main PCB on?
• NO Does power go off when power is turned on again 2 minutes after
power is turned off?
• YES Is the fuse F503 of the Engine PCB blown?
YES Replace the Engine PCB.
• NO Are the Engine PCB FFC (inserting DRV0 and DRV1 connectors)
and the power connector cable properly connected to the Motor
Driver PCB and the power supply?
NO Connect them properly or replace the FFC or the cable.
• YES Replace the power supply.
• YES Is the DIMM of the Main PCB set properly?
NO Set the DIMM properly. If that does not solve the problem, replace
the DIMM.
• YES Is the operator panel cable connected properly?
NO Connect the cable properly.
• YES Is +5V output to the panel connector (OPEPANE) of the Engine PCB (S2V
PWB)?
Pin 5: +5V, Pin 2: 0V
• NO Is +5V output to the DENGEN connector of the Engine PCB (S2V
PWB)?
Pins 1 & 3: +5V, Pins 2 & 4: 0V
NO After checking the DENGEN connector, replace the Low-
Tension Power Supply Unit.
• YES Replace the Engine PCB.
• YES Is the problem solved after the Control Panel PCB (X7G PWB) is replaced?
YES End
NO Replace the Engine PCB.
(a)
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