Brother MFC-9420CN Service Manual page 51

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Belt Discharging (Erase Lamp)

OPC belt discharging process means that upon completion of the first transfer process, LED

light is radiated on the OPC belt prior to cleaning the belt to discharge the residual charge for

electrical cleaning.

(1) Structure of erase lamp PU

1) Erase lamp PU is located as shown in Fig.3-9.

2) Luminous source of erase lamp is the 6 pieces of light emitting diodes (LED).

(2) Process of discharging (Refer to Fig.3-20.)

1) Though a toner image is transferred to the transfer belt in the first transfer process,

there is still a residual charge on the OPC belt.

2) Residual charge -VR(V) on the OPC belt is discharged by the radiation of erase

lamp's light prior to cleaning the belt.

First Transfer

(Erase Lamp PU)

OPC Belt Cleaning

Confidential

Troubleshooting