Brother MFC-9420CN Service Manual page 40

<Structure of the OPC Belt>
The OPC belt consists of a surface layer having a photoconductor (OPC) of organic material,
the inner layer of an insulator material (PET / Mylar) and an aluminum deposit layer in between.
The OPC belt is located as shown in Fig.3-6 as the main part of the print system.
Transfer Belt
Electrode
Belt Cartridge
OPC Belt
Charger Roller
Fig. 3-6
Fig. 3-7
3 - 6
Toner Cartridge
Laser Assy
Photoconductor(OPC)
Aluminum Deposit Layer
Insulator Material
Confidential