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Konica Minolta DF-502 Service Manual Download Page 43

Field Service Ver. 1.0 Apr. 2005

7. Introduction

21

DF-502

T

roubleshooting

Troubleshooting

7.

Introduction

• Information required for troubleshooting and steps that must be performed are described 

in this chapter.

7.1

Electrical Components Check Procedure

• If a paper misfeed or malfunction occurs, perform the following operations to check the 

condition of the electrical components.

7.1.1

Sensor

Step

Check

Result

Action

1

Does the input signal of the control board change when the 
sensor light is interrupted? (H 

→

 L, L 

→

 H)

NO

Replace the sensor.

YES

Replace the control 
board.

4025T520AA

4025T521AA

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Summary of Contents for DF-502

Page 1: ...SERVICE MANUAL 2005 04 Ver 1 0 DF 502 THEORY OF OPERATION...

Page 2: ......

Page 3: ...ts the number of times the revision has been made To indicate clearly a section revised show in the lower outside section of the correspond ing page A number within represents the number of times the...

Page 4: ......

Page 5: ...Operation 2 Automatic Document Feeder DF 502 3 2 1 Construction 3 2 2 Operation 4 2 2 1 Document Take Up and Feed 4 2 2 2 Document Transport 5 2 3 Electrical Parts Layout 6 2 4 Document Separating Me...

Page 6: ...DF 502 Outline Composition Operation Theory of Operation Ver 1 0 Apr 2005 ii Blank page...

Page 7: ...r Invoice R and Invoice A3 and A4 B4 and B5 11 x 17 and Letter Legal and Letter R Legal and Invoice Letter R and Invoice Document Alignment Center Capacity 50 sheets max 80 g m2 Power Requirements DC2...

Page 8: ...1 Product specification Theory of Operation Ver 1 0 Apr 2005 2 DF 502 Outline Blank page...

Page 9: ...cument Feeder DF 502 3 DF 502 Composition Operation Composition Operation 2 Automatic Document Feeder DF 502 2 1 Construction 1 Main Motor 4 Registration Rollers 2 Pick Up Roller 5 Take Up Roller 3 Ex...

Page 10: ...r Take Up Clutch and by a gear train and a belt driven by the Main Motor The Paper Empty Sensor is used to detect a document loaded on the Document Loading Tray The Document Stoppers determine the lea...

Page 11: ...Operation 2 2 2 Document Transport The document taken up is transported to the document scanning position of the copier by the Registration Rollers The Registration Rollers are turned by a gear train...

Page 12: ...ke Up Cover Open Close Detecting Sensor Paper Empty Sensor Registration Sensor Separator Sensor PC5 PC6 PC7 PC8 PC9 PC10 PC11 PC12 Paper Exit Sensor Length Size Detection Sensor 1 Length Size Detectio...

Page 13: ...nce the friction coefficient on the top side of the paper is equal to that on the underside of the paper the Separation Roller is turned by the Take up Roller This feeds the paper forward When two or...

Page 14: ...on Ver 1 0 Apr 2005 8 DF 502 Composition Operation 2 5 Document Exit Mechanism The document is fed out of the ADF by the Exit Roller The Exit Roller is driven by gears and a belt which are driven by t...

Page 15: ...cted while the original is being taken up Each sensor is located as follows with reference to the Document Edge Guide in the rear Document Length Detection The length of the original is detected by th...

Page 16: ...2 Automatic Document Feeder DF 502 Theory of Operation Ver 1 0 Apr 2005 10 DF 502 Composition Operation Blank page...

Page 17: ...SERVICE MANUAL 2005 04 Ver 1 0 FIELD SERVICE DF 502...

Page 18: ......

Page 19: ...ts the number of times the revision has been made To indicate clearly a section revised show in the lower outside section of the correspond ing page A number within represents the number of times the...

Page 20: ......

Page 21: ...ize Sensor 2 7 3 Other 8 3 1 Disassembly Adjustment prohibited items 8 3 2 Disassembly Assembly procedure 9 3 2 1 Exterior Parts 9 3 2 2 Interface Board PWB AF 10 Adjustment Setting 4 How to use the a...

Page 22: ...d 22 7 1 4 Clutch 22 7 1 5 Motor 23 8 Jam Display 24 8 1 Misfeed Display 24 8 1 1 Display Resetting Procedure 24 8 2 Sensor layout 25 8 3 Solution 26 8 3 1 Initial Check Items 26 8 3 2 Misfeed at the...

Page 23: ...nvoice R and Invoice A3 and A4 B4 and B5 11 x 17 and Letter Legal and Letter R Legal and Invoice Letter R and Invoice Document Alignment Center Capacity 50 sheets max 80 g m2 Power Requirements DC24 V...

Page 24: ...1 Product specification Field Service Ver 1 0 Apr 2005 2 DF 502 General Blank page...

Page 25: ...aintenance procedure Periodical check parts 2 1 1 Pick up Roller Take up Roller A Cleaning Procedure 1 Open the Upper Door 2 Using a soft cloth dampened with alcohol wipe the Take up Roller clean of d...

Page 26: ...Take up Section Cover 9 3 Snap off two C clips 4 Remove two Bearings and the Pick up Roller Take up Roller Assy 5 Snap off one C clip and remove one lever and the holder 6 Snap off one C clip and rem...

Page 27: ...ve two screws and the Separa tor Section Protective Cover 3 Unhook one spring and remove the Separation Roller Assy 4 Remove the Separation Roller B Cleaning Procedure 1 Remove the Separator Section P...

Page 28: ...a soft cloth dampened with alcohol wipe the Registration Rolls clean of dirt 3 Remove the Rear Cover 4 Remove the Document Feeding Tray 9 5 Remove three screws and the Regis tration Roller Cover 6 Rem...

Page 29: ...ohol wipe the Exit Roller Rolls clean of dirt 2 1 5 Cleaning of the Transport Rolls 1 Remove the Rear Cover 2 Remove the Document Feeding Tray 9 3 Remove the Registration Roller Cover 4 Using a soft c...

Page 30: ...peration manual and make necessary adjustment Note that when two or more screws are used on the part in questions only one representative screw may be marked with red paint C Variable Resistors on Boa...

Page 31: ...emove the Document Take up Section Cover 2 Rear Cover Open the Upper Door Remove one screw and unhook six tabs Remove the Rear Cover 3 Document Feeding Tray Open the Upper Door Remove the Rear Cover R...

Page 32: ...pr 2005 10 DF 502 Maintenance 3 2 2 Interface Board PWB AF 1 Open the Upper Door 2 Remove the Rear Cover 9 3 Unplug all connectors from the Inter face Board 4 Remove two screws and the Inter face Boar...

Page 33: ...tilation etc levelness of the installation site 5 The original has a problem that may cause a defective image 6 The density is properly selected 7 The Original Glass slit glass or related part is dirt...

Page 34: ...e 1 Press the Utility key 2 Press the following keys in this order 3 Stop 0 0 Stop 0 1 4 The Service mode menu screen will appear 5 1 2 Exiting Press the Panel Reset key as many times as it is require...

Page 35: ...0 mm 1 Make a full size copy of the test chart 2 Measure the length of reference line A on the copy to determine if the deviation falls within the specified range If it falls outside the specified ran...

Page 36: ...ance between reference line B on the copy and the top edge of the copy width B and determine if the amount of error in width B falls within the specified range If it falls outside the specified range...

Page 37: ...Using a scale measure the distance between reference line C on the copy and the leading edge of the copy length C and determine if the amount of error in length C falls within the specified range If i...

Page 38: ...een fed in When a paper misfeed of originals occurs Setting Procedure Step 1 Load paper in the ADF 2 Press the Start key to start the ADF feed test Press the Stop key to stop the ADF feed test Purpose...

Page 39: ...Setting 6 Mechanical adjustment 6 1 ADF Height Adjustment 1 Turn one screw so that the spacer contacts the glass at the scale posi tion of the copier Turn the screw clockwise to raise the ADF Turn the...

Page 40: ...chart that comes with the ADF option 2 Load the test chart in the ADF and make five 1 sided copies NOTE Load the test chart lengthwise 3 Align each copy sample as shown on the left and check the devi...

Page 41: ...justment Setting 5 If the deviation is as shown on the left move the graduations of the ADF to the front 6 If the deviation is as shown on the left move the graduations of the ADF to the rear 7 Tighte...

Page 42: ...6 Mechanical adjustment Field Service Ver 1 0 Apr 2005 20 DF 502 Adjustment Setting Blank page...

Page 43: ...n this chapter 7 1 Electrical Components Check Procedure If a paper misfeed or malfunction occurs perform the following operations to check the condition of the electrical components 7 1 1 Sensor Step...

Page 44: ...he switch YES Replace the control board 4025T523AB Not Use COM NO Step Check Result Action 1 Does the output signal of the control board change from H to L when the solenoid is activated NO Replace th...

Page 45: ...e motor NO Replace the control board Step Check Result Action 1 Does the input signal of the master board change from H to L when the motor is turned on The input signal differs depend ing on the rota...

Page 46: ...ator lights up steadily and the Display gives a corresponding message 8 1 1 Display Resetting Procedure Open the corresponding cover clear the sheet of paper misfed and close the cover Display Message...

Page 47: ...Field Service Ver 1 0 Apr 2005 8 Jam Display 25 DF 502 Troubleshooting 8 2 Sensor layout 1 Registration Sensor PC3 AF 3 Paper Exit Sensor PC5 AF 2 Separator Sensor PC4 AF 1 2 3 4688T501AB...

Page 48: ...age procedures Is a foreign object present along the paper path or is the paper path deformed or worn Clean or change the paper path Are the Paper Separator Fingers dirty deformed or worn Clean or re...

Page 49: ...been energized Document left in the document take up section The Separator Sensor PC4 AF is blocked at timing when the Power Switch is turned ON the cover is opened and closed or a paper misfeed or ma...

Page 50: ...been energized Document left in the document transport section The Registration Sensor PC3 AF is blocked at timing when the Power Switch is turned ON the cover is opened and closed or a paper misfeed...

Page 51: ...en energized Document left in the document exit section The Paper Exit Sensor PC5 AF is blocked at timing when the Power Switch is turned ON the cover is opened and closed or a paper misfeed or malfun...

Page 52: ...8 Jam Display Field Service Ver 1 0 Apr 2005 30 DF 502 Troubleshooting Blank page...

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