Oki MC770 series Maintenance Manual - Warning

45376001TH  Rev.1 

71 /

Oki  Data  CONFIDENTIAL

4.  Component replacement

4.1  Precautions on component replacement

(1)  Remove the AC cord and the interface cable before replacing the parts. 

(a)  Remove the AC cord according to the following procedure. 

①  Switch the power switch of printer off “O”. 

②  Disconnect the AC insertion plug of the AC power cord from the AC 

power source.  

③  Disconnect the earth wire from the earth terminal of the AC power 

source outlet.  

④  Disconnect the AC cord and the interface cable with the printer.

Warning

Risk of Electric Shock 

There is a risk of electric shock during replacement of the low voltage power supply. 

Use insulating gloves or avoid direct contact with any conducting part of the 

power supply, and caution should be exercised during replacement. 

The capacitor may take one minute to complete discharge after the AC cord 

is unplugged. Also, there is a possibility that the capacitor doesn’t discharge 

because of a breakage of the PCB, etc., so remember the possibility of electric 

shock to avoid electric shock. 

(b)  Reconnect the printer according to the following procedure. 

①  Connect the AC cord and the interface cable with the printer. 

②  Connect the earth wire to the earth terminal of the AC power source 

outlet.  

③  Connect the AC power cord insertion plug to the AC power source 

outlet.  

④  Switch the power switch of printer on “I”.

(2)  Do not disassemble it if the printer works normally. 

(3)  Disassemble it as required. Do not remove the part that is not shown in the 

replacement procedure. 

(4)  Please use the specified maintenance tool. 

(5)  Disassemble it according to the proper procedure. It may cause damage to the 

parts if disassemble it without following the proper procedure.

(6)  As the small parts such as the screws are lost easily, please fix them to the 

original position temporarily.

(7)  Do not use gloves that may cause static electricity easily when handling IC and 

the circuit board such as microprocessor, ROM, and RAM. 

(8)  Do not put the PCB on the device and the floor directly.

(9)  Do not work for a long time with the printer with the top cover open, and an 

image drum unit installed in it.

Remove

Install