REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday, 18 March 2019

HOW TO TROUBLESHOOT THE PAPER JAM - CANON LBP1120 - LASER PRINTER

HOW TO TROUBLESHOOT PAPER JAM - CANON LBP1120 - LASER PRINTER



PAPER JAM
The paper path can be divided into two sections: 1) paper pickup and feed block, and 2) fixing and delivery block.
Paper Pickup Unit
Possible Causes
1. The paper top sensing lever does not move smoothly or is damaged.
Action: If the lever is not installed properly, reinstall it correctly. If the lever is damaged or deformed, replace it.
2. Defective paper top sensing lever spring.
Action: If the spring is out of place, set it in the right position. If the spring is deformed or damaged, replace it.
3. Worn, deformed or dirty pickup roller or feed roller
Action: Clean the rollers if dirty. If the rollers are worn or deformed, replace them.
4. Defective lifting plate spring
Action: If the spring is out of place, set it in the right position. If the spring is deformed or damaged, replace it.
5. Poor contact in the connectors on the main motor drive signal line.
Action: Reconnect the connector J007F on the main motor.
6. Poor contact in the connectors on the pickup roller solenoid drive signal line.
Action: Reconnect the connector J204F on the engine controller PCB.
7. Defective pickup roller solenoid
Action: Disconnect the connector J204F on the engine controller PCB. Measure the resistance between the connector J204-1 and J204-2 on the cable side. If the measured value is not about 120Ω, replace the pickup roller solenoid.
8. Defective paper top sensor.
Action: Replace the paper top sensor.
9. Defective main motor.
Action: Replace the main motor.
10. Defective engine controller PCB.
Action: Replace the engine controller PCB.

Fixing and Delivery Unit
Possible Causes
1. Defective deflector.
Action: If the deflector is worn, broken, nicked or damaged, replace it.
2. Dirty or scarred fixing unit entrance guide or toner build-up on the guide.
Action: Clean the guide if dirty. Replace the guide if the dirt cannot be removed.
3. The pressure (nip width) of the pressure roller is not within the specification.
Action: Replace the fixing pressure units.
4. The pressure roller does not rotate smoothly.
Action: Check whether the gear is worn or damaged. If the pressure roller is worn, replace it.
5. Deformed or damaged fixing film unit and pressure roller.
Action: If the fixing film unit and pressure roller are deformed or damaged, replace them.
6. The paper delivery sensing lever does not move smoothly or is damaged.
Action: Adjust the lever to move smoothly. Replace the lever if damaged.
7. Defective paper delivery sensing lever spring.
Action: If the spring is out of place, set it in the right position. Replace the spring if damaged or deformed.
8. The fixing delivery roller does not rotate smoothly.
Action: Check the gears, and replace any worn or fractured gear(s). If the fixing delivery roller is worn, replace it.
9. The facedown delivery roller does not rotate smoothly.
Action: Check the gears, and replace any worn or fractured gear(s). If the face down delivery roller is worn, replace it.
10. Defective engine controller PCB.
Action: Replace the engine controller PCB.
Posted By: FRANK at 03:51
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