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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Monday, 18 March 2019

MALFUNCTION TROUBLESHOOTING - CANON LPB1120 - COPIER

MALFUNCTION TROUBLESHOOTING - CANON LPB1120 - COPIER

TROUBLESHOOTING
Laser Failure/BD Failure
Possible Causes
  The laser shutter cannot be opened due to the damaged claw of the cartridge cover.
Action: Replace the cartridge cover.
  Poor contact in the connectors in the laser scanner unit.
Action: Reconnect the connector J801F, J802F on the laser/scanner unit and connector J208F on the engine controller PCB.
  Defective laser/scanner unit.
Action: Turn ON the printer. Immediately after turning ON the printer, if the voltage between the connectors J208M-5 and J208M-6 on the engine controller PCB is about +5V and also the voltage between the connectors J208M-1 and J208M-4 is about +24V, replace the laser/scanner unit.
  Defective engine controller PCB.

Action: Replace the engine controller PCB.

Fixing Unit Failure
Possible Causes
  Poor contact in the connectors.
Action: Reconnect the connector J206 on the engine controller PCB.
  Broken wire or short-circuited thermistor.
Action: Turn OFF the power and remove the fixing unit from the printer. Measure the resistance between the connectors J703-1 and J703-2 on the fixing unit side. If the resistance is not within the range from about 250 kΩ to about 800 kΩ (room temperature), replace the fixing film unit.
  Broken wire of the heater or blown thermal fuse.
Action: Remove the fixing unit. Check the connectors J102F-1 and J102F-2 on the fixing unit side for continuity. If the connectors have no continuity between them, replace the fixing film unit.
  Defective engine controller PCB.
Action: Replace the engine controller PCB.

Although a paper jam has not occurred, the printer cannot enter the READY mode, outputting a “JAM” status.
Possible Causes
  Defective paper delivery sensor spring.
Action: If the spring is not installed correctly, reinstall it correctly. Or, if the spring is deformed or damaged, replace it.
  Defective paper delivery sensing lever.
Action: If the lever is not installed correctly, reinstall it correctly. Or, if the lever is deformed or damaged, replace it.
  Defective paper top sensor spring.
Action: If the spring is not installed correctly, reinstall it correctly. Or, if the spring is deformed or damaged, replace it.
  Defective paper top sensing lever.
Action: If the lever is not installed correctly, reinstall it correctly. Or, if the lever is deformed or damaged, replace it.
  Defective engine controller PCB.
Action: Replace the engine controller PCB.

Although the door is closed after installing the cartridge, the printer cannot enter the READY mode, outputting a “DOOR OPEN” status.
Possible Causes
  Damaged claw of the door switch on the connector holder.
Action: Replace the connector holder.
  Defective door open detection unit.
Action: Replace the door open detection unit.
  Defective door open detection switch / engine controller PCB.
Action: Replace the engine controller PCB.

Although paper is set in the printer, the printer cannot enter the READY mode, outputting a “PAPER OUT” status.
Possible Causes
  Defective paper out sensing lever.
Action: If the lever is not installed correctly, reinstall it correctly. Or, if the lever is deformed or damaged, replace it.
  Defective paper out sensor.
Action: Replace the paper out sensor (PS003.)
  Defective engine controller PCB.
Action: Replace the engine controller PCB.

Although the cartridge is installed in the printer, the printer cannot enter the READY mode, outputting a “NO CARTRIDGE” status.
Possible Causes
  Poor contact in the primary high-voltage contact on the engine controller PCB and cartridge contact.
Action: Clean the contacts if dirty. If the problem still remains after cleaning, or parts are deformed or damaged, replace them.
  Defective cartridge.
Action: Replace the cartridge.
  Defective engine controller PCB.
Action: Replace the engine controller PCB
Posted By: FRANK at 03:47
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