Canon FY8-23AV-000 manual Copy is foggy overall

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CHAPTER 3 IMAGE TROUBLESHOOTING

4.The copy has uneven density (darker at front).

5.The copy has uneven density (lighter at front).

Cause

Step

Checks

YES/NO

Remedies

 

 

 

 

 

Scanner

1

Clean the scanning lamp,

YES

End.

 

 

reflecting plate, and lens.

 

 

 

 

Is the problem corrected?

 

 

 

 

 

 

 

Cartridge, Scanning

2

Press the Copy Start key, and

YES

1. Replace the cartridge.

lamp

 

switch the copier OFF in the

 

2. Replace the scanning

 

 

middle of operation; then, open

 

lamp unit.

 

 

the top cover.

 

 

Transfer charging roller

 

NO

Check the transfer charg-

 

Does the toner image on the

 

 

 

ing roller.

 

 

photosensitive drum before

 

 

 

 

 

 

 

transfer have uneven density?

 

 

 

 

 

 

 

6. The copy is foggy (overall).

Cause

Step

Checks

YES/NO

Remedies

 

 

 

 

 

Scanner

1

Clean the scanning lamp,

YES

End.

 

 

reflecting plate, and lens.

 

 

 

 

Is the problem corrected?

 

 

 

 

 

 

 

Scanning lamp,

2

Is continuity present between

YES

1. Check if the scanning

Developing bias

 

photosensitive drum PCB and

 

lamp goes ON normally.

 

 

grounding spring?

 

2. Check the developing

 

 

 

 

bias.

 

 

 

 

 

Grounding spring

 

 

NO

Check to make sure if the

 

 

 

 

grounding spring is prop-

 

 

 

 

erly attached in front of the

 

 

 

 

cartridge.

 

 

 

 

 

3-8

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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
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