Canon FY8-23AV-000 manual Electrical, Adjusting the Intensity VR604

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CHAPTER 2 STANDARDS AND ADJUSTMENTS

B. Electrical

Notes:

If you have replaced the scanning lamp unit, intensity sensor, AE sensor, or control panel PCB, you must adjust the three variable resistors on the control panel PCB (one, if PC400/FC200); you must, however, adjust them in the order of VR604, VR602, and VR603 (from intensity to AE).

1. Adjusting the Intensity (VR604)

a.After Replacing the Control Panel PCB Only

1)Disconnect the power plug, and detach the faulty control panel PCB.

2)Set the meter to the ‘200 k ’ range, and measure C between the terminal of VR604 and the terminal of R614 on the detached control panel PCB; see Figure 2-1B.

3)Likewise, measure C between the terminal of VR604 and the terminal of R614 on the new control PCB; then, turn VR604 so that the reading is the same as the measurement taken in step 2).

4)In the case of the PC420/430/FC220, adjust VR602 (A between terminals of VR602 and JP607) and VR603 (Between terminals of VR603 and JP621); see Figure 2-1B.

5)Attach the new control panel PCB to the copier.

B (VR603)

A (VR602) C (VR604) Control panel PCB

C (R614)

B (JP621)

A (JP607)

Figure 2-1B (PC420/430/FC220)

2-2

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Contents Service Handbook Copyright 1998 Canon INC Contents Troubleshooting Malfunctions Self Diagnosis Page Periodical Servicing Periodically Replaced PartsDurables 2D Transportation 1D Temperature/Humidity SpecificationsStoring Sealed Cartridges Storing and Handling Unsealed Cartridges Reference Image Adjustment Basic Procedure Pre-ChecksPoints to Note Mechanical GlassAdjusting the Intensity VR604 Electrical2B PC400/FC200 Adjusting the AE Mechanism VR602, VR603 JP607 JP605 JP604 Control panel PCB Screwdriver Standards and Adjustments Checking the Documents Making Initial ChecksSite Environment Checking the Transfer Charging Roller Checking the Feeding AssemblyChecking the Lens Array for Dirt Checking the Copy PaperImage Troubleshooting Others Image Troubleshooting Samples of Image Faults Troubleshooting by Image Fault YESCopy is foggy overall Back Replace the cartridge Is the problem corrected? Copy has white spots cross feed direction Back of the copy is soiledCopy has faulty fixing Copy has poor sharpness focus Copy has a blurred imageCopy is foggy cross feed direction Copy is blank Copy is solid blackImage Troubleshooting Troubleshooting Malfunctions Self diagnosis PC400/FC200Copyboard Does the copying operation start AC power is absent Pick-up fails Scanning lamp fails to go onMain motor fails to rotate Copyboard fails to moveFixing heater fails to operate Paper feeding normallyAt time of jam Copy Paper Jams Pick-Up Assembly Separation/Feeding AssemblyFixing/Delivery Assembly Wrinkles Feeding FaultsDouble Feeding Arrangement and Functions of Electrical Parts Sensors and SolenoidsSwitches Lamp, Heater, Motor, and Others Printed Circuit Board PCB Variable Resistors VR and Check Pins by PCB DC Controller/DC Power Supply PCBControl Panel PCB PC400/FC200Self Diagnosis Self Diagnosis General Timing Chart PC420/430/FC220 General Timing Chart A4, 2 copies Signals/Abbreviations List SignalsAbbreviations General Circuit Diagram PC420/430/FC220 General Circuit Diagram Special Tools Table Solvents/Oils Table Specifications LTR/A4 LGLNVD Prepared by This publication is printed on 70% reprocessed paper