Xerox Phaser 840 Service Manual

[Page 1] Xerox Phaser 840

Service Manual With Phaser ® 8200 Color Printer Addendum Phaser ® Color Printer 840/850/860 Download Free Service Manual at http://printer1.blogspot.com ...

[Page 2] Xerox Phaser 840

...

[Page 3] Xerox Phaser 840

Warning The following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. This ...

[Page 4] Xerox Phaser 840

Copyright © 2002, Xerox Corporation. All Rights Reserved. Unpublished rights reserved under the copyright laws of the United States. Contents of this publication may not be reproduced in any form without permission of Xerox Corporation. Copyright ...

[Page 5] Xerox Phaser 840

User safety summary Terms in manual CAUTION Conditions that can result in damage to the product. WARNING Conditions that can result in personal injury or loss of life. Power source: For 110 VAC printers, do not apply more than 130 volts RMS betw...

[Page 6] Xerox Phaser 840

DANGER high voltage: Protective ground (earth) terminal: Use caution. Refer to the manual(s) for information: WARNING: If the product loses the ground connection, usage of knobs and controls (and other conductive parts) can cause an electrical sho...

[Page 7] Xerox Phaser 840

Contents i Contents User safety summary ......................................................................................... iii Service safety summary..................................................................................... iv List ...

[Page 8] Xerox Phaser 840

ii Phaser 840/850/860/8200 Color Printer - Service Manual Troubleshooting 3 - 73 Network Event Logs ............................................................................................ 3 - 75 Electronics Troubleshooting .........................

[Page 9] Xerox Phaser 840

Contents iii Diagnostics, Adjustments and NVRAM 4 - 119 Front Panel Shortcuts..........................................................................................4 - 119 Hidden Service Menu ..........................................................

[Page 10] Xerox Phaser 840

iv Phaser 840/850/860/8200 Color Printer - Service Manual 22: Manuf. Skew Margins ......................................................................... 5 - 171 23: Manuf. Banding ......................................................................

[Page 11] Xerox Phaser 840

Contents v Wiring Diagrams 9 - 235 Phaser 8200 Color Printer Addendum PA - 241 Phaser 8200 Printer Configurations........................................................ PA - 241 Hardware Updates .....................................................

[Page 12] Xerox Phaser 840

vi Phaser 840/850/860/8200 Color Printer - Service Manual ...

[Page 13] Xerox Phaser 840

List of Tables vii List of Tables Installed RAM and printer capabilities - - - - - - - - - - - - - - - - - - - - - - - - - 1-8 Acceptible SDRAM DIMMs - - - - - - - - - - - - - - - - - - - - - - - - - ...

[Page 14] Xerox Phaser 840

viii Phaser 840/850/860/8200 Color Printer - Service Manual Hidden Service Menu - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-121 Diagnostic Menu Map - - - - - - - - - - - - - - - ...

[Page 15] Xerox Phaser 840

List of Figures ix List of Figures The Phaser 840/850 printer shown with optional High-Capacity Paper Tray Assembly. - - 1-1 The Phaser 860 printer shown with the optional High-Capacity Paper Tray Assembly.- - - 1-1 Internal features of the prin...

[Page 16] Xerox Phaser 840

x Phaser 840/850/860/8200 Color Printer - Service Manual Removing the Phaser 850 printer main board - - - - - - - - - - - - - - - - - - - - 7-181 Removing the Main Board (Phaser 860) - - - - - - - - - - - - - - - ...

[Page 17] Xerox Phaser 840

General Inormation 1 - 1 General Information This service guide contains information used to verify operation, troubleshoot, repair, adjust, and maintain the Xerox Phaser® 840, Phaser® 850 and Phaser® 860 Color Printers. This guide includes a ...

[Page 18] Xerox Phaser 840

1 - 2 Phaser 840/850/860/8200 Color Printer - Service Manual Phaser 840 Printer Overview The Phaser 840 Color Printer is an Adobe PostScript® Level 3 (Version 3010) color, solid-ink printer. It also supports color PCL 5c at 600 x 600 dots-per-inch...

[Page 19] Xerox Phaser 840

General Information 1 - 3 A 133-MHz PowerPC processor oversees print engine operations and PostScript image processing. The printer features an integral bi-directional parallel port (IEEE 1284C with ECP mode) and a 10BaseT Ethernet port (with supp...

[Page 20] Xerox Phaser 840

1 - 4 Phaser 840/850/860/8200 Color Printer - Service Manual Phaser 850 Printer Overview The Phaser 850 Color Printer is an Adobe PostScript Level 3 (Version 3010) color, solid-ink printer. It also supports color PCL 5c at 600 x 600 dots-per-inch r...

[Page 21] Xerox Phaser 840

General Information 1 - 5 Phaser 860 Printer Overview The Phaser 860 Color Printer is an Adobe PostScript Level 3 (Version 3010) color, solid-ink printer. It also supports color PCL 5c at 600 x 600 dots-per-inch resolution. The printer can print a...

[Page 22] Xerox Phaser 840

1 - 6 Phaser 840/850/860/8200 Color Printer - Service Manual The printer supports Job Accounting which maintains from 50 to 5000 records of processed print jobs, depending on memory and hard drive options. The record contains information such as ...

[Page 23] Xerox Phaser 840

General Information 1 - 7 Phaser 840/850 RAM and Printer Capabilities The Phaser 840 printer features two DIMM connectors which accept both 32- or 64-Mbytes RAM DIMMs (16-Mbyte RAM DIMMs work but are not offered). The Phaser 850 printer features ...

[Page 24] Xerox Phaser 840

1 - 8 Phaser 840/850/860/8200 Color Printer - Service Manual Memory Considerations Phaser 840/850 With more memory, the printer dual-frame buffers for printing one image while processing a second image (which gives greater printing throughput). Th...

[Page 25] Xerox Phaser 840

General Information 1 - 9 Print the Configuration Page and check the item “Installed RAM” to see what type of RAM is installed. For example: Installed RAM: 64 Mbytes Mem slot 1: SDRAM/parity/64 MB/KMM366S823BTL-G0 Mem slot 2: Empty This i...

[Page 26] Xerox Phaser 840

1 - 10 Phaser 840/850/860/8200 Color Printer - Service Manual Phaser 860 RAM and Printer Capabilities The Phaser 860 printer features two SODIMM connectors which accept off the shelf 64MB or 128 MB SODIMM SDRAM memory modules meeting these specific...

[Page 27] Xerox Phaser 840

General Information 1 - 11 Memory Considerations Phaser 860 With more memory, the printer dual-frame buffers for printing one image while processing a second image (which gives greater printing throughput). The printer’s capabilities can be incr...

[Page 28] Xerox Phaser 840

1 - 12 Phaser 840/850/860/8200 Color Printer - Service Manual Print Engine Assemblies 840/850/860 Fig 1-3 Internal features of the print engine 0388- 0 Ink load assembly X-axis drive and motor Paper feed motor Paper/ drum heater Cap/wipe/purge as...

[Page 29] Xerox Phaser 840

General Information 1 - 13 Circuit Boards Seven circuit boards support the printer’s electronics. Two boards, called I/O boards (left and right), support the front panel, solenoids and sensors. The main board contains the printer’s CPU proces...

[Page 30] Xerox Phaser 840

1 - 14 Phaser 840/850/860/8200 Color Printer - Service Manual Fig 1-5 Circuit boards of the print engine (left rear view Phaser 850) Fig 1-6 Circuit Boards of the print engine (right rear view Phaser 860) 0388-04 I/O board left Power control board...

[Page 31] Xerox Phaser 840

General Information 1 - 15 The printer’s I 2 C bus An internal data bus, called the I 2 C bus, connects all I/O boards to the main board. Through this single bus, the main board can “poll” the I/O boards for the state of the printer’s sens...

[Page 32] Xerox Phaser 840

1 - 16 Phaser 840/850/860/8200 Color Printer - Service Manual Printhead Maintenance System The printer features a printhead maintenance system used to clean the printhead faceplate and clear clogs from the printhead nozzles. The system consists of...

[Page 33] Xerox Phaser 840

General Information 1 - 17 Sensor Maps Sensors in the printer provide information to the main board to determine the state of the printer. The printer monitors the positions of some of the movable assemblies, such as the drum, as well as the temper...

[Page 34] Xerox Phaser 840

1 - 18 Phaser 840/850/860/8200 Color Printer - Service Manual Fig 1-10 Switches and Sensors on the left side of the print engine Drum encoder sensor Process gear position sensor Drum-home- position sensor (Phaser 840 only) Drum temperature sensor ...

[Page 35] Xerox Phaser 840

General Information 1 - 19 Caution The actual position of some printer assemblies, such as the printhead or the cap/wipe/purge assembly, cannot be ascertained at all times. The printer records, in NVRAM, where it last positioned such assemblies e...

[Page 36] Xerox Phaser 840

1 - 20 Phaser 840/850/860/8200 Color Printer - Service Manual Combination sensors and their meanings Combinations of sensors are used by the printer to determine the type of standard (or upper) media tray installed in the printer. Media tray type s...

[Page 37] Xerox Phaser 840

General Information 1 - 21 The Main Board The main board features the printer’s PowerPC 603e processor that controls the engine and the PostScript processing. Prominent on the main board is the ROM code DIMM and the RAM DIMM plug-in modules. The...

[Page 38] Xerox Phaser 840

1 - 22 Phaser 840/850/860/8200 Color Printer - Service Manual Fig 1-13 Features of the Phaser 850 printer main board Fig 1-14 Features of the Phaser 860 Main Board 0388-76 RAM DIMMs EEPROM Printer ID Code ROM module P860-002 Hard Drive RAM SODIMM...

[Page 39] Xerox Phaser 840

General Information 1 - 23 Front Panel - Phaser 840/850 Printers These front panel features are found on the printer: ■ 128 x 64 pixel backlighted graphic display ■ Two push buttons and four arrow buttons ■ Two LEDs LCD. The backlighted LCD se...

[Page 40] Xerox Phaser 840

1 - 24 Phaser 840/850/860/8200 Color Printer - Service Manual Front Panel - Phaser 860 These front panel features are found on the printer: ■ 128 x 64 pixel backlighted graphic display ■ Four push buttons and two arrow buttons ■ One LED statu...

[Page 41] Xerox Phaser 840

General Information 1 - 25 Rear Panel Connections Phaser 840 printer connectors The rear panel of the Phaser 840 printer features the host interface connectors to the printer: ■ Standard parallel (high-density connector), IEEE 1284C. ■ Twisted ...

[Page 42] Xerox Phaser 840

1 - 26 Phaser 840/850/860/8200 Color Printer - Service Manual Phaser 850 printer connectors The rear panel of the Phaser 850 printer features the host interface connectors to the printer: ■ Standard parallel (high-density connector), IEEE 1284C. ...

[Page 43] Xerox Phaser 840

General Information 1 - 27 Phaser 860 printer connectors The rear panel of the Phaser 860 printer features the host interface connectors to the printer: ■ Standard parallel (high-density connector), IEEE 1284C. For the Phaser 860 printer, it can ...

[Page 44] Xerox Phaser 840

1 - 28 Phaser 840/850/860/8200 Color Printer - Service Manual Rear Panel Status LEDs Two LEDs on the rear panel indicate the status of the printer’s CPU functions: PostScript processing and print engine control or diagnostics. 1. PostScript hea...

[Page 45] Xerox Phaser 840

General Information 1 - 29 Phaser 840, 850 and 860 Printer Differences Note There are additional part differences not detailed in this table. Please refer to "FRU Parts List", on page 8-207 for a complete listing of parts and part numbers...

[Page 46] Xerox Phaser 840

1 - 30 Phaser 840/850/860/8200 Color Printer - Service Manual Left I/O board A new left I/O board. Right I/O board New board to support the new front panel. Y-axis drum encoder assembly A new Y-axis drum encoder is used, which does not use a sepa...

[Page 47] Xerox Phaser 840

General Information 1 - 31 Specifications Table 1-8 Physical dimensions Dimensions Value Height: 38.7 cm. (15.25 ins.) 51.4 cm (20.25 ins.) with one High-Capacity Paper Tray Assembly 64.1 cm (25.25 ins.) with two High-Capacity Paper Tray Assemblies W...

[Page 48] Xerox Phaser 840

1 - 32 Phaser 840/850/860/8200 Color Printer - Service Manual Table 1-10 Functional specifications Characteristic Specification Printing process Solid-ink onto plain paper. Color medium Cyan, magenta, yellow and black ink sticks, each shape-coded. ...

[Page 49] Xerox Phaser 840

General Information 1 - 33 Usable envelopes #10 (U.S.) DL (Metric) #6 3/4 (U.S.) Choukei 3 Gou C5 (Metric) Choukei 4 Gou US Monarch (Phaser 850/860 printer only) Note: Do not use envelopes with endflaps (except Choukei 3 & 4 Gou), plastic window...

[Page 50] Xerox Phaser 840

1 - 34 Phaser 840/850/860/8200 Color Printer - Service Manual RF emissions Both 115 and 220 VAC-configured instruments pass these standards: EC EN60950:1992 Safety of Information Technology Equipment including Business Equipment EC EN55022:1992 L...

[Page 51] Xerox Phaser 840

General Information 1 - 35 Regulatory Specifications The printers are in conformance with the following regulatory standards: ■ FCC Part 15 Class B (for 115 VAC equipment) ■ EN55022 (CISPR 22) Class B ■ VCCI (CISPR 22) Class B ■ EN61000-3-2 F...

[Page 52] Xerox Phaser 840

1 - 36 Phaser 840/850/860/8200 Color Printer - Service Manual ...

[Page 53] Xerox Phaser 840

Error Codes and Messages 2 - 37 Error Codes and Messages Phaser 840/850 Rear Panel PS and PE LED Codes The rear panel LEDs are located on each side of the rear panel DIP switches. The left LED represents the operation of the PostScript firmware. ...

[Page 54] Xerox Phaser 840

2 - 38 Phaser 840/850/860/8200 Color Printer - Service Manual 8 not used 9NVRAM (Phaser 840 only) This test does a walking 1s and a walking 0s test for that last 4 bytes in the VxWorks section of the NVRAM. 10 EEPROM This test reads in the first 2...

[Page 55] Xerox Phaser 840

Error Codes and Messages 2 - 39 none 10baseT (Phaser 840 only) This test verifies the functionality of the Ethernet LAN Controller chip. Any test failures with this component are treated as non-fatal errors with the error information written to ...

[Page 56] Xerox Phaser 840

2 - 40 Phaser 840/850/860/8200 Color Printer - Service Manual Phaser 860 Power-Up Error Messages and LED Codes The Phaser 860 has two sets of tests that are run when the printer is first powered on: Built-In Self Tests (BIST) and Power-On Self Test...

[Page 57] Xerox Phaser 840

Error Codes and Messages 2 - 41 POST (Power On Self Test) When these tests begin the front panel has been initialized. In most cases, if an error occurs, a text message is displayed on the front panel along with an LED blink code flashing on all th...

[Page 58] Xerox Phaser 840

2 - 42 Phaser 840/850/860/8200 Color Printer - Service Manual Soft Error 14.xx Real Time Clock test failures. These are soft errors and will allow the printer to continue printing, though all time stamping activities will be incorrect. Reseat then ...

[Page 59] Xerox Phaser 840

Error Codes and Messages 2 - 43 21 21.06 Left printhead jetstack thermistor is out of range. Replace the printhead. 21 21.07 Right printhead jetstack thermistor is out of range. Replace the printhead. 21 21.08 Printhead reservoir thermistor is out ...

[Page 60] Xerox Phaser 840

2 - 44 Phaser 840/850/860/8200 Color Printer - Service Manual Fault Codes Error codes indicate the following: ■ The failing system (XX,yyy.zz) ■ The failing subsystem (xx,YYY.zz) ■ The type of problem (xx,yyy.ZZ). ■ The print engine cop...

[Page 61] Xerox Phaser 840

Error Codes and Messages 2 - 45 Table 2-4 Front Panel & Fault History Log Error Codes and Messages Error code Definition 2,000: SYSTEM FAULT I/O BOARD... 2,001.40: SY_DEV_FAULT_IO_ RIGHT The engine cannot detect the presence of the right I/O boa...

[Page 62] Xerox Phaser 840

2 - 46 Phaser 840/850/860/8200 Color Printer - Service Manual 4,013.43 PC_DEV_FAULT_GEAR_ GRIND ***see SB399*** The printhead is unable to move on its tilt axis. The head is unable to move on its tilt axis, because it is colliding with something ...

[Page 63] Xerox Phaser 840

Error Codes and Messages 2 - 47 4,014.44 PC_DEV_FAULT_6x6DPI_ CAL Calibration Failure: Defined but not used. 4,015.45 PC_DEV_FAULT_HEAD_A DJUST_TIMEOUT The engine spent over 20 minutes in the printhead adjust-state. The engine declares a devi...

[Page 64] Xerox Phaser 840

2 - 48 Phaser 840/850/860/8200 Color Printer - Service Manual 4,032.66 PC_PROG_FAULT(0x20) Undefined result in pc_process_result(). The PC task function pc_process_result() received an undefined inter-task communication (ITC) result message from on...

[Page 65] Xerox Phaser 840

Error Codes and Messages 2 - 49 5,000: Y-AXIS PROGRAM FAULT CODES, see also SB457, SB461, SF167 5,001.41: YA_HOME_FAIL Drum-home sensor failure. The drum has turned a full revolution without seeing the drum-home sensor activate. Check the Y-axis ...

[Page 66] Xerox Phaser 840

2 - 50 Phaser 840/850/860/8200 Color Printer - Service Manual 6,003.44 Indication that the motor coil(s) is open or shorted, or the X-axis motor fuse has opened. Follow the procedure "Testing motor and solenoid resistances", on page 84 of...

[Page 67] Xerox Phaser 840

Error Codes and Messages 2 - 51 07,004.46: PM_FAULT_DM_CAM_ State_Error ***see SF165 & SF167*** The Drum Maintenance home sensor did not actuate or change state as expected. Run diagnostics to verify clutch and sensor operation. Also verify th...

[Page 68] Xerox Phaser 840

2 - 52 Phaser 840/850/860/8200 Color Printer - Service Manual 7,035.63: PM_PROG_FAULT_ FUNCS(3) Negative delay in pm_sleep_for(). A negative delay argument was passed to pm_sleep_for(). 7,036.64: PM_PROG_FAULT_ FUNCS(4) Unexpected message in pm_slee...

[Page 69] Xerox Phaser 840

Error Codes and Messages 2 - 53 8,000: CAP TASK PROGRAM FAULT CODES 08,001.44: CAP_FAULT_HOME_ SENSOR *** see SB464*** The cap-home sensor did not see the sensor’s flag when expected. The home sensor may be faulty, or the paper- feed motor may ...

[Page 70] Xerox Phaser 840

2 - 54 Phaser 840/850/860/8200 Color Printer - Service Manual 8,002.67 CAP_PROG_FAULT(22) Generic Cap Task Program Fault. This error indicates that the main CAP state sequencer, cap_main(), has entered the program fault state. There are multiple re...

[Page 71] Xerox Phaser 840

Error Codes and Messages 2 - 55 9,008.43 and 9,101:43 IL_FAULT_K_JAM The black ink-melt heater is on, but ink does not seem to be dripping. Check that the ink stick is able to advance in the chute. An ink stick jam will be reported three times b...

[Page 72] Xerox Phaser 840

2 - 56 Phaser 840/850/860/8200 Color Printer - Service Manual 11,033.65 DMC_PROG_FAULT(33) Motion Control Event Missed. A missed control store event was detected. A health check routine is called every 400 milliseconds, the A/D update period, and c...

[Page 73] Xerox Phaser 840

Error Codes and Messages 2 - 57 13,011.66 tc_bomb(this, 11) Bad TCH message in fault state. While in the divice fault state, the reervoir thermal manager received an unexpected message, not a turn off or a regulate command. The device fault state i...

[Page 74] Xerox Phaser 840

2 - 58 Phaser 840/850/860/8200 Color Printer - Service Manual 15,004.45: TCD_THERMISTOR_ SLOW Most likely cause is a failed drum heater. The head to drum gap should only be checked or adjusted on the Phaser 840. The Phaser 850 and 860 have a pre-a...

[Page 75] Xerox Phaser 840

Error Codes and Messages 2 - 59 Table 2-5 22,LSS.TC Error Codes: Media Jams 22,LSS.TC: Media jams L indicates the location of the jam 1. Bottom Hi-capacity Paper Feeder 2. Middle Hi-capacity Paper Feeder 3. Top standard tray 4. Handfeed 5. Front...

[Page 76] Xerox Phaser 840

2 - 60 Phaser 840/850/860/8200 Color Printer - Service Manual Table 2-6 22,000 Fault Codes and Actions Error code Additional clues Probable cause Action 22,101.06 Unexpected Lower -tray-present sensor event in Lower Feeder 2 with media in Lower Fee...

[Page 77] Xerox Phaser 840

Error Codes and Messages 2 - 61 2. Leading edge jam (right corner fold) a. Media is low in tray b. Media has natural curvature c. Media is short grained d. Using lightweight media e. Paper path is obstructed a. Add more media b. Flip over media or r...

[Page 78] Xerox Phaser 840

2 - 62 Phaser 840/850/860/8200 Color Printer - Service Manual 22,306.15 Time-out of pick flag on main tray with media picked from the main tray 1. Pick roller is slipping a. Media is too heavy and/or has high sheet-to-sheet friction a. Try differen...

[Page 79] Xerox Phaser 840

Error Codes and Messages 2 - 63 22,500.00 Command stop event with media in front door area *** See SF144 & SB460*** a. Inspect the maintenance drawer for worn lift pins, replace if needed 1. Media perfect in media path (front door area) a. Dr...

[Page 80] Xerox Phaser 840

2 - 64 Phaser 840/850/860/8200 Color Printer - Service Manual 2. Media came from lower feeder and missed preheat entry flag a. Lower feeder bias problem a. Make sure media is on the left side of the tray 3. Media damaged in center a. Pick pad a. D...

[Page 81] Xerox Phaser 840

Error Codes and Messages 2 - 65 22,522.04 Media not exiting completely 1. None a. Media slipping on exit rollers a. Try different media, clean the exit rollers or replace the exit cover b. Clean the exit rollers c. Replace the exit cover 22,538.13...

[Page 82] Xerox Phaser 840

2 - 66 Phaser 840/850/860/8200 Color Printer - Service Manual 22,605.05 Unexpected standard-tray-sensor event with media in exit door area *** Same as 22,105.01 *** 22,613.05 Unexpected stripper exit sensor event 1. Paper started backing up before...

[Page 83] Xerox Phaser 840

Error Codes and Messages 2 - 67 4. Excess skew a. Last sheet in tray b. First sheet in tray c. Failure of deskew system d. Exit roller is out of position a. Refill tray(s) b. Make sure tray(s) is loaded properly and media is square in tray c. Check...

[Page 84] Xerox Phaser 840

2 - 68 Phaser 840/850/860/8200 Color Printer - Service Manual 22,703.05 Y-axis stall. Typically during transfix. May result from belt slippage. a. Verify that the lower tray is properly loaded. b. Try heavier media 2. More than one sheet of paper i...

[Page 85] Xerox Phaser 840

Error Codes and Messages 2 - 69 22,707.00 Y-axis declared media is too long. Typically caused by a multipick or stuck A4 sensor 1. None a. Verify that the lower tray is properly loaded. b. Try heavier media 2. More than one sheet found in paper pat...

[Page 86] Xerox Phaser 840

2 - 70 Phaser 840/850/860/8200 Color Printer - Service Manual 7. Stripper fingers or rapid release guide do not move freely a. Bushing out of place b. E-ring missing c. Parts bound up a. Reassemble stripper fingers or rapid release guide b. Reass...

[Page 87] Xerox Phaser 840

Error Codes and Messages 2 - 71 Table 2-7 Front Panel & Fault History Log Error Codes and Messages Error code Definition 23,000: NVRAM SYSTEM FAULTS 23,003.65 SYS_NVRAM_PROG_ FAULT(3) Head Tweak Read Failed. A read of the head tweak value from n...

[Page 88] Xerox Phaser 840

2 - 72 Phaser 840/850/860/8200 Color Printer - Service Manual Blank Page ...

[Page 89] Xerox Phaser 840

Troubleshooting 3 - 73 Troubleshooting The troubleshooting section discusses Repair Analysis Procedures (RAPs) for the Phaser 840/850/860 printers. This section is broken into the following groups: ■ Network Event Logs ■ Electrical Interface Pro...

[Page 90] Xerox Phaser 840

3 - 74 Phaser 840/850/860/8200 Color Printer - Service Manual Print Image Quality Problems (RAP) Table Macintosh Printing Problems Table 3-3 Print and Image Quality Problems RAP Table Problem on Page Not Printing page 88 Missing ink or light colored ...

[Page 91] Xerox Phaser 840

Troubleshooting 3 - 75 Network Event Logs Phaser 850 The Phaser 850 printer maintains three logs in memory detailing network functions. The logs contain TCP/IP and Netware initialization landmarks and limited print-time processes. The log also s...

[Page 92] Xerox Phaser 840

3 - 76 Phaser 840/850/860/8200 Color Printer - Service Manual Electronics Troubleshooting System power-up sequence The following lists the chain of events that occur when you turn on a printer. You can follow this list as one means of determining i...

[Page 93] Xerox Phaser 840

Troubleshooting 3 - 77 5. The process motor is activated to rotate the head tilt gear into its home position. (If the printhead is in the locked position it will not tilt forward.) The process motor also rotates all the rollers to their ready pos...

[Page 94] Xerox Phaser 840

3 - 78 Phaser 840/850/860/8200 Color Printer - Service Manual Phaser 860 Customer Mode Power-Up Sequence Power switch is turned on: 1. Power supply senses AC line voltage conditions (110 VAC or 220 VAC) and enables DC voltages. If an overload occur...

[Page 95] Xerox Phaser 840

Troubleshooting 3 - 79 9. The x-axis motor activates to move printhead off its locking post. The x-axis motor activates for three short bursts to ensure the printhead is in its far-left travel (printhead home position). Then the x-axis motor is r...

[Page 96] Xerox Phaser 840

3 - 80 Phaser 840/850/860/8200 Color Printer - Service Manual Inoperative printer problems. Refer to Appendix Electronics Troubleshooting Checklist. The printer shuts down with the power switch on. The printer may have experienced a spurious over-cur...

[Page 97] Xerox Phaser 840

Troubleshooting 3 - 81 Verifying print engine operation by printing a built in page. 1. If not already on, turn on the printer. If the printer does not begin initializing, go to the topic, “Measuring power supply voltages”. 2. Once the Power l...

[Page 98] Xerox Phaser 840

3 - 82 Phaser 840/850/860/8200 Color Printer - Service Manual Inspecting the power supply fuses Three fuses (F1 - F3) are mounted on the power supply. 1. Turn off the printer and remove the power cord. 2. Remove side and rear covers. 3. Remove the...

[Page 99] Xerox Phaser 840

Troubleshooting 3 - 83 Testing for shorted drivers 1. Turn off the printer. 2. Disconnect the +40 DC loopback connector (the 4-pin connector with the two loopback wires) from J250 at the top of the power control board. (This isolates the Y-axis mo...

[Page 100] Xerox Phaser 840

3 - 84 Phaser 840/850/860/8200 Color Printer - Service Manual Testing for a shorted motor 1. Reinstall the power supply if removed in the previous procedure. 2. Disconnect the process motor, the Y-axis motor, X-axis motor and the cap/wipe/purge asse...