Xerox 3150 - Phaser B/W Laser Printer, Руководство по обслуживанию

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Summary of Product
4-8
4.3 Main Controller Board (PBA)
The engine board and controller board have been integrated into a single board consisting of the CPU and printer
control functions. The CPU functions as the bus controller, I/O handler, motor driver and PC interface. The main
board sends the current image video data to the laser unit and manages the electrophotographic printing process.
Circuits on the main board drive the main motor (paper feed, cartridge, fuser), clutch, pre-transfer lamp, heat-lamp
and fan. The signals from the paper feed jam sensor and paper empty sensor are inputted to the main board from the
power supply board.
1. U1 Low drop fixed and adjustable positive voltage regulators (LD1117DT)
2. U2 Low power, dual bi-polar comparators (LM393D)
3. U4 Spread spectrum clock generator (CY25811)
4. OSC1 CPU X-TAL (12 MHz)
5. U6, U15 SDRAM (K4S641632H)
6. U7 Low voltage HEX inverter with 5 V tolerant Schmitt trigger inputs (74LCX14)
7. U9 Motor driver (A3977SLP)
8. U11 Graphics processor ASIC (SPGPm)
9. U24 Low voltage HEX inverter with 5V tolerat Schmitt trigger inputs (74LCX14)
10. U23 Parallel port single termination network (ST1284)
11. U22 Low voltage IEEE translating transceiver (161284)
12. OCS3 Video X-TAL (19.6 MHz)
13. U25 USB 2.0 (NET2270)
14. OSC4 USB X-TAL (30 MHz)
15. U14, U19 Low voltage octal D-type flip-flop (74LVX273)
16. U10 Low voltage, bi-directional transceiver (74LCX245)
17. U13 Flash Memory (29LV160DB)
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