Service manual

30 July, 2001 OVERVIEW
6-5
Detailed
Descriptions
Descriptions
1. BCU (Base Engine Control Unit)
The BCU has two CPUs (Main and MUSIC). The CPUs control the following
functions:
• Main CPU
• Engine sequence
• Machine and printer engine operation
• Timing for peripherals
• High voltage supply, laser, and fusing
• Sensors, motors, and solenoids
• MUSIC (Mirror Unit for Skew and Interval Correction) CPU
• TD sensor
• Line position adjustment
• Memory chip on the toner cartridge
2. Controller
The controller handles the following functions:
• Printer-to-host interface
• Operation panel interface
• Network interface
• Interfacing and control of the optional IEEE1394, HDD and DRAM DIMM
3. LD Drive Board
This is the laser diode drive circuit board.
4. IEEE1394 Interface (Option)
This allows computers to connect to this printer using an IEEE1394 interface.
5. HDD Unit (Option)
The HDD unit stores the data for the following.
• Additional soft fonts
• Collation
• Locked print
• Sample print
• Downloading forms for form overlay
6. Memory DIMM (Standard: 32MB DRAM, Option: 64/128/256MB DRAM)
This is for additional printer processing memory, used for collation and for soft
fonts.
7. Operation Panel Board
Controls the display panel, the LED, and the keypad.
8. IEEE1284 Interface
This is a parallel printer port.