User manual LEXMARK IBM TYPEWRITER 6784

[. . . ] Changes are periodically made to the information herein; these changes will be incorporated in later editions. Improvements or changes in the products or the programs described may be made at any time. Comments may be addressed to Lexmark International, Inc. , Department D22A/032-2, 740 West New Circle Road, Lexington, Kentucky 40550, U. S. A or e-mail at ServiceInfoAndTraining@Lexmark. com. Lexmark may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you. [. . . ] If paper other than 20lb plain letter/A4 paper is being used, load 20lb plain letter/A4 and print the Print Quality pages to see if the problem remains. Print the Print Quality Pages, and looked for variations in the print from what is expected. 3. 7. An incorrect printer driver for the installed software can cause problems. Incorrect characters could print, and the copy may not fit the page correctly. Measure all voltages from the connector to the printer ground. Print quality--background Service tip: Some background problems can be caused by rough papers, non-Lexmark toner cartridges or if the media texture is set to the rough setting. Some problems occur with printers that run a large amount of graphics in a humid environment. Step 1 Questions / actions Read the current status of the photoconductor unit from the customer menus. Ask the customer if the photoconductor unit has been recently replaced. It is possible the photoconductor value was not reset and the photoconductor unit is past end of life. No Go to step 2. Diagnostic information 2-55 5022-xxx Step Questions / actions Replace the PC unit. Does this fix the problem? Yes Problem solved. No Go to step 3. 2 3 Check the high voltage contact from the HVPS to the transfer belt assembly. Transfer belt high voltage path (typical 4X) Replace the spring or the transfer contact assembly. See "Photoconductor unit removal" on page 4-70. Print quality--horizontal line The photoconductor unit is defective. Replace the photoconductor unit. Print quality--insufficient fusing Step 1 Questions / actions Is the fuser properly installed?see "Low voltage power supply (LVPS) removal" on page 4-65. 2 Print quality--missing image at edge Reseat the developer cartridge. Print quality--mottle (2­5mm speckles) Keep running prints through, and the problem normally clears up. If the problem persists, replace the developer cartridge. Print quality--narrow vertical line Step 1 Questions / actions Replace the photoconductor unit. No Replace the print cartridge. Diagnostic information 2-59 5022-xxx Print quality--random marks Service tip: The primary cause of random marks is due to loose material moving around inside the printer and attaching to the photoconductor unit, developer roll, or transfer belt. Step 1 Questions / actions Is there any loose or foreign material on the photoconductor unit?No Go to step 2. 2 3 Is there any loose or foreign material on the cartridge roll?Is there any loose or foreign material on the transfer belt? Go to step 3. Contact your next level of support. Print quality--residual image Service tip: Install a new print cartridge if available before doing this service check. Residual image can be caused by the photoconductor, cleaning blade, and other parts inside the print cartridge. Step 1 Questions / actions Is there any toner contamination on the fuser assembly? [. . . ] Signal Locations and connectors 5-13 5022-xxx Connector listing--models C52x (see "System card (network)--models C52x" on page 5-11 or "System card (non-network)--models C52x" on page 5-12) (continued) Connector JHVPS1 Pin no. 1 3 5 7 9 11 13 15 17 19 21 23 JINT1 1 2 3 JLVPS1 1 3 5 7 9 11 13 15 JMIRR1 1 2 3 4 5 JOPT1 1 3 5 7 9 Signal Ground C-DEVPWM Y-DEVPWM Ground HV_EMPTY_C HV_EMPTY_Y HV_CHRG_PWM HV_XFER_PWM_C HV_XFER_PWM_M HV_XFER_PWM_Y CORE_CURR_SNSD HV_XFER_PWM_K VS_JINT-1 (+5V_SW) Ground VS_INT (+5V_PH) +5 V dc +5 V dc LVPS_ZERO_XING +24 V dc Ground Ground Ground LVPS_BRON MM_REF MM_LOCK MM_START Ground +24 V dc VS_JOPT-1 (+5V_SW) S_OPT_ENC Ground +24VC OPT_PLEV 2 4 6 8 10 OPTION_PWM OPT_TYPE Ground OPT_PSIZE OPT_PCTL 2 4 6 8 10 12 14 16 +5 V dc +5 V dc +24 V dc +24 V dc Ground Ground Ground LVPS_HRON Pin no. 2 4 6 8 10 12 14 16 18 20 22 24 Signal V_24VD M-DEVPWM K-DEVPWM +5V_SW HV_EMPTY_M HV_EMPTY_K TONER_CHK XFER_SERV0_C XFER_SERV0_M XFER_SERV0_Y HVPS_ID XFER_SERV0-K 5-14 Service Manual 5022-xxx Connector listing--models C52x (see "System card (network)--models C52x" on page 5-11 or "System card (non-network)--models C52x" on page 5-12) (continued) Connector JOPP1 Pin no. 1 2 3 4 5 6 7 JPH1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Signal I2C_DATA5_OP V_PANEL+5V I2C_CLK_OP Ground I2CIRQ5_R +3. 3 V dc Ground Ground D_VDO_MD_VDO_M+ Ground D_VDO_CD_VDO_C+ Ground PH_EMS1_SNS_R VDO_BOOST1 VDO_LPOW1 VDO_LADJ01 VDO_HADJ01 PH_EMS0 VDO_BOOST0 VDO_LPOW0 VS_+5VPH_NVX_R PH_EOS_THERM_SNS +5V_PH I2C_CLK_PH I2C_DATA_PH VDO_LENA PH_EMS2_SNS_R VDO_BOOST2 VDO_LPOW2 VDO_LADJ23 VDO_HYSNC1 PH_EMS3_SNS_R VDO_BOOST3 VDO_LPOW3 Ground Pin no. 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