HP 4 Plus Manual
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1 2 3 4 Figure 7-13 Major Assembly and Connector Locations (3 of 3) NumberPart 1 Power Supply Assembly 2 Envelope Feeder Main Motor (M4) 3 Lower Cassette Drive PCA 4 Lower Cassette Main Motor (M3) Table 7-33 Troubleshooting 7-61
Figure 7-14 Switch Locations NumberPart SW101 AC Input ON/OFF Switch (Power Supply Assembly) SW 601 Top Cover Open Sensing Switch SW602 TEST PRINT Switch SW603 PC (Tray 2) Tray Size Switches SW604 SW605 Table 7-34 7-62 Troubleshooting
Figure 7-15 Optional 500 Sheet Lower Cassette NumberPart SW851 Optional 500 Sheet Paper Feeder Paper Tray (Tray 3) Size Switches SW852 SW853 Table 7-35 Troubleshooting 7-63
5VR202 J206 J203 J204 J205 61 1 8 1 1 7 1 2 1 3 1J202 J201 13 1 3 J212 CP202 16TB201 CP201J211 4 110 1 J210 3 1 J209 4 1 3 1 25 26 J213 J208 J207 Figure 7-16 DC Controller PCA Layout—LaserJet 4/4M Number Part J201 Paper Control PCA J205 Scanner/Beam Detect J206 Laser Drive PCA J207 Formatter PCA J208 Deliver/Exit Sensor PS3 J210 Interconnect PCA J209 Cooling Fan J211 Main Motor J212 Power Supply/Fuser Drive VR202 Registration Adjustment TB201 DC Voltages (from Power Supply) Table 7-36 7-64 Troubleshooting
5J204 15 1 1 9 2 1 J206 J205 VR201 1 13 31 17 J201 J212 31 J215 TB201 6 1 J214 10 1J213 31 J211 3 J210 1 8 1 1 7 J209J208 J207 31 32 Figure 7-17 DC Controller PCA Layout — LaserJet 4 Plus/5 NumberPart J201 Paper Control PCA J208 Scanner/Beam Detect J209 Laser Drive PCA J207 Formatter PCA J210 Deliver/Exit Sensor PS3 J213 Interconnect PCA J211 Cooling Fan J214 Main Motor J215 Power Supply/Fuser Drive VR201 Registration Adjustment TB201 DC Voltages (from Power Supply) J206 Control Panel Table 7-37 Troubleshooting 7-65
TB403 TB404TB405 TB406VR401 J402 3 1 J401 5 1A B A B TB402 TB401 Figure 7-18 High Voltage PCA Layout Number Part J401 High Voltage PS Connection To DC Controller PCA via Interconnect PCA TB401 Transfer Roller Contact TB402 Drum Ground Contact TB403 Toner Low/EP Toner Cartridge-in-Place Contact TB404 GND TB405 Developer Roller Contact TB406 Charge Roller Contact VR401 Factory Adjustment Only Table 7-38 7-66 Troubleshooting
Repetitive Defect Template Repetitive print defects usually are associated with a specific roller within the printer, or the Toner Cartridge. The following templates are provided to help quickly isolate the cause of repetitive print defects. Align the first occurrence of the defect with the top of the “ruler” , and measure to the next occurrence of the defect to determine the roller in question. When you are certain that your defect pattern matches the pattern of the template, replace the indicated roller. / 5 ) Figure 7-19 Repetitive Defect Ruler Troubleshooting 7-67
Figure 7-20 Main Wiring Diagram (LJ 4+/5 only) 7-68 Troubleshooting
Voltage Test Points The operating voltages of the printer can be verified by: 1Listening for the exhaust fan. A rotating fan indicates that the +5 VDC and +24A VDC voltages are present. (The fan runs on +24A VDC. The +5 VDC enables the +24A VDC.) 2Listen for the Main Motor. If the Main Motor runs, the +24B VDC is enabled, therefore +24A VDC must be present. Measuring the DC Voltage Levels The DC voltage levels can be measured directly on the DC Controller TB 201. TB 201 connects the DC Controller with the Power Supply. (See the Main Wiring Diagram, and Figure 7-16 or 7-17, the DC Controller PCA Layout in the previous section.) Remove the Formatter cage to access the DC Controller. The voltages on TB201 are as follows: Voltage ColorPin Number +5 VDC Brown 1, 2 +24 VDC Red3 Ground Blue4, 5, 6 Table 7-39 TB 201Voltages Figure 7-21 TB 201 Voltages Troubleshooting 7-69