Charge Roller Voltage Correction
Correction for Environmental Conditions
The voltage transferred from roller to drum could vary with the temperature and humidity around the drum
charge roller. The lower the temperature or humidity, the higher the applied voltage required.
The ID sensor measures the effects of ambient conditions, and any small change in drum potential caused
by changes in temperature/humidity is reflected in the amount of toner transferred to the drum.
This measurement is done immediately after the ID sensor pattern for toner density control. After creating
ID sensor pattern [A], another pattern [B] is made. To do this, the LD switches off, the charge roller voltage
drops, and the drum potential is reduced to –600 V. At the same time, development bias returns to –550
V. The drum potential is now slightly higher than the development bias, so only a very small amount of toner
6. Details
320
6
Содержание A-P4
Страница 1: ...Model A P4 Machine Code G147 SERVICE MANUAL May 12th 2006 Subject to change...
Страница 27: ...Installation Flowchart 1 Installation 26 1...
Страница 32: ...2 Remove the tray full sensor cover 1 x2 x1 3 Insert the loose connector 2 into the hole Bridge Unit B538 31 1...
Страница 59: ...3 Reattach the application cover x1 1 Installation 58 1...
Страница 64: ...Lubrication Lubricate the paper feed clutch gear A with Silicone Grease G501 every PM visit Lubrication 63 2...
Страница 65: ...2 Preventive Maintenance 64 2...
Страница 72: ...Left Covers 1 Left upper cover A x4 2 Controller cover B x2 Covers and Common Procedures 71 3...
Страница 82: ...Laser Unit 81 3...
Страница 103: ...5 Cover C x2 6 Gear D x1 7 Lower paper feed unit E x2 x1 3 Replacement and Adjustment 102 3...
Страница 116: ...Left side 5 Two terminals C x2 6 Center fusing lamp lead D Clamps x3 7 Bracket E x1 Right side Fusing Unit 115 3...
Страница 119: ...5 Springs x2 A both sides 6 Arms x2 B both sides 7 Pawl bracket C x4 3 Replacement and Adjustment 118 3...
Страница 127: ...2 Paper feed unit A x2 x2 3 Rear bracket B x4 x1 bushing x1 4 Paper feed clutch C x1 3 Replacement and Adjustment 126 3...
Страница 128: ...Duplex Unit Duplex Cover Removal 1 Duplex unit cover A x4 Duplex Unit 127 3...
Страница 142: ...IOB 1 Remove the center plate A x1 x1 2 Remove the rear lower cover B x 4 3 Remove the IOB C x 24 x 4 Boards 141 3...
Страница 181: ...4 Troubleshooting 180 4...
Страница 289: ...Self Diagnostic Test Flow 5 Service Tables 288 5...
Страница 303: ...In this machine the development unit is provided with its own motor separate from the main motor 6 Details 302 6...
Страница 306: ...Controller Block Diagram Board Layout 305 6...
Страница 319: ...What Happens When a New Unit Is Detected 6 Details 318 6...
Страница 367: ...6 Details 366 6...
Страница 379: ...MEMO 378...
Страница 380: ...MEMO 379...
Страница 381: ...MEMO 380...