The write unit comprises a housing and the following main parts:
No.  | Description  | No.  | Description  | 
|---|---|---|---|
1  | 1st Mirror  | 5  | F-theta Lens  | 
2  | Dust Shield Glass  | 6  | Soundproof Glass  | 
3  | PCU (Y,M, C, K)  | 7  | Polygon Mirror Motor (M27)  | 
4  | 2nd Mirror  | - | - | 
No.  | Description  | No.  | Description  | 
|---|---|---|---|
1  | LD Drive Board (M/Y) (PCB15)  | 4  | Synchronizing detector board (PCB17)  | 
2  | LD Drive Board (Bk/C) (PCB14)  | -  | -  | 
3  | Cylinder Lens (Bk/C)  | -  | -  |