Oki OL1200 Service Manual page 154

The printer does not work normally after being turned on.
Is
No
No
Yes
message shown in the LCD display (for less than 1 second)?
Is the AC cable connected properly?
No Connect the cable properly.
Is the message (16 columns
display?
Yes Replace the Control board.
Are the following voltages applied to the corresponding pins of the POWER
connector on the Control board? (For the measuring points, see Fig. 6-1.)
Pin 15: 8V, Pin 16: +8V, Pins 19, 20: +30V
Pins 21, 22, 26-29: 0V, Pins 23-25: +5V
No Remove the AC cable. Set the POW switch to the ON position.
Measure the resistance between L and N pins of the AC inlet using a
multimeter. Is there continuity between L and N pins (normal resistance:
554 ký)? (For measuring points, see Fig. 6-2.)
No Replace the fuse F1 or the Power/sensor board
Yes Are POWER connector and FRONT connector (white, 9-pin connector)
for CN3 on the Power/sensor board, CN8 on the Driver board, and the
Control board made properly.
No Connect the connectors properly.
Yes Are the following voltages applied to CN3 connector of the Power/sensor
board? (For measuring points, see Fig. 6-3.)
Pins 16, 17: +30V, Pins 8-10, 14, 15: 0V
Pin 20: 8V, Pins 11-13: +5V, Pin 21V: +8V
No Replace the Power/sensor board.
Yes Replace the Driver board.
Is the printer recovered?
Service Guide OL1200
Chapter 6 Troubleshooting Procedures
display only on the top row ) shown in the LCD
Page: 101