HP LaserJet 4 Service Manual - Page 296
High Voltage PCA Layout, Number, Table 7-38
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TB401 TB402 TB403 TB404 J401 A A B 5 B 1 TB405 VR401 3 1 J402 TB406 Figure 7-18 High Voltage PCA Layout Table 7-38 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 7-66 Troubleshooting
TB403
TB404
TB405
TB406
VR401
J402
3
1
J401
5
1
A
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