40930701TH DRAFT Vesion 134 /1 The printer does not work normally after being turned on.• Is message shown in the LCD display (for less than 1 second)?• No Is the AC cable connected properly?• No Connect the cable properly.t• No Is the message (16 columns n display only on the top row ) shown in the LCDdisplay?• Yes Replace the Main board.t• No Are the following voltages applied to the corresponding pins of the POWERconnector on the Main board? (For the measuring points, see Figure 6-1.)Pin 23: –8V, Pin 24: +8V, Pins 19, 20: +30VPins 9-12, 17, 18: 0V, Pins 13, 14: +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 amultimeter. Is there continuity between L and N pins (normal resis-tance: 554 kΩ)? (For measuring points, see Figure 6-2.)• No Replace the fuse F2 or the Power Supply Unit (AC120V or230V)t• Yes Are POWER connector of the Main board and Connection cord-Wire(26 pin) connected properly?Are connection cord-wire and CN3 connector of the Power SupplyUnit (AC120V or 230V) connected properly?• No Connect the connectors properly.t• Yes Are the following voltages applied to CN3 connector of the PowerSupply Unit (AC120V or 230V)? (For measuring points, see Figure 6-3.)Pins 19, 20: +30V, Pins 9-12, 17, 18: 0VPin 23: –8V, Pins 13, 14: +5V, Pin 24: +8V• No Replace the Power Supply Unit (AC120V or 230V).t• Yes Replace the Connection cord-wire (26 pin).t• Is the printer recovered?• No Replace the Main boardt• YES END1-11-2
