CHAPTER 6 SELF DIAGNOSIS6-12E0640000 The presence of a high-voltage error is communicated by the compositepower supply PCB. (The output for primary charging, developing, or trans-fer has deviated from a specific level of voltage.)Main cause The contact has poor connection. The wiring is faulty. The composite powersupply PCB is faulty. The DC controller PCB is faulty.Action1. ContactIs any of the contacts of the primary charging roller, developing assembly,or transfer charging roller soiled? Or, is there poor contact?YES: Clean the contact, and set it once again.2. WiringIs the wiring between the contacts for the following normal: DC controllerPCB (J301), composite power supply PCB (J136), primary charging roller,developing assembly, transfer charging roller?a. DC controller PCB (J301) <-> composite power supply PCB (J136)b. composite power supply PCB (J130-7) <-> primary charging roller con-tactc. composite power supply PCB (J130-1) <-> developing assembly contactd. composite power supply PCB (FT133) <-> transfer roller contactNO: Correct the connection.3. Composite power supply PCB, DC controller PCBTry replacing the composite power supply PCB. Is the problem corrected?YES: Yes.NO: Replace the DC controller PCB.
