Chapter Contents
5 Functional Overview
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Basic Printer Functions – 5-2
DC Controller/Power System – 5-3
Print Engine Control – 5-5
Laser and Scanner Drive – 5-5
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Paper Motion Monitoring and Control – 5-5
Top Door/Toner Cartridge Microswitch (SW201) – 5-6
Engine Test MicrosWitch (SW301) -5-7
Motors – 5-7
Power System (on DC Controller PCA) – 5-8
AC Power Distribution – 5-8
DC Power Distribution – 5-8
Overcurrent/Overvoltage Protection – 5-10
Intelligent ON/OFF (LaserJet 41J4ML only) – 5-10
High Voltage Power Distribution – 5-11
Formatter System – 5-12
CPU – 5-13
Read Only Memory (ROM) -5-13
Random Access Memory (RAM) -5-13
Non-Volatile Memory (NVRAM) – 5-14
Parallel Interface – 5-14
High Speed (Yes/No) – 5-14
Advanced Functions (On/Off) – 5-14
Serial I/O (LaserJet 4P/4MP) -5-15
Pacing (Serial Modes of Operation) – 5-15
LocalTalk I/O (LaserJet 4ML/4MP) – 5-15
Control Panel – 5-16
LaserJet 4L/4ML – 5-16
LaserJet 4P/4MP – 5-16
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Resolution Enhancement (REt) – 5-17
Print Density Adjustment – 5-17
EconoMode – 5-18
Memory Management – 5-19
Memory Enhancement technology (MEt) – 5-19
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Image Adapt (LaserJet 4L/4ML) – 5-20
Page Protect – 5-20
PJL Overview – 5-21
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(continued on back)
Chapter 5
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