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SAMPLE PAGE FROM INTRAVIA’S SERVICE GUIDE TO LASER PRINTERS PANASONIC 4420

Introduction / Production: 1989 Note: Our book includes a picture of the printer, however we find that causes problems on the website, especially when printing, so it has been omitted from the sample page.
Cartridge Information
Toner: KX-P451. Dual component toner/developer. Yield is 3,000 pages.
Developer: Developer unit KX-PDP2. Yield is 18,000 pages.
Drum: Drum unit: KX-PDM2. Yield is 18,000 pages.
Ozone filter: KX-PFT2. Yield is 18,000 pages.
Fuser Unit: KX-PS2. Yield is 36,000 pages.
Transfer corona: KX-PCR2. Yield is 36,000 pages.
Density adjustment: Knob on top of machine.
Test Print: Several methods. Press "On line" to take off line. Press "Reset/test". You may have to press this again. When you see "Test", press "Enter". You will either start a test page, or you will have several choices. The choices would be "Fonts", which will print out the machine's fonts. Or it would be "Character Print", which will print out a page or pages of characters. Or you might be able to choose a "Status Print", which will print out what the machine has been set up to. In any case, if you press "Enter" again, you will cancel the printout, even if it has not yet started.
Entering Service mode. Hold the left arrow (¬ ) and up arrow (­ ) while turning on power. Hold these for a few seconds. After warm-up is completed, "Service mode" will display. Use the "Menu" key to hunt around.
Reset: will clear out the interval count, non-paper pass (jam), and error code counts.
Calibration: Adjust the laser position on the drum.
Top calibration: Adjust lead edge registration.
Left calibration: Adjust side to side registration.
Service pattern: This requires a special tool, which plugs into the font card slot, to print out a service pattern.
Character print: Pages of characters. Will keep printing until you press "Enter" again.
Check mode: This is how you read counters for jams and error codes. The machine will display how many times each of these trouble codes has happened.
Total count: This is where you get the page count. Press "Enter" to read it.
Drum Count: Pages run on this drum. This is automatically reset when the drum is replaced.
Developer Count: Pages run on this developer unit. This is automatically reset when the drum is replaced.
Note: There are "first use sensors", usually fuses, which cause these to display. In some cases, these fuses are available to install and reset the count without necessarily replacing the item.
18K Service: This will display automatically. It is expected that the ozone filter be replaced at this time.
36K Service: This will display automatically. It is expected that the fuser unit and transfer corona will be replaced at this time. Remember that the drum and developer are also expected to be replaced at 18,000 pages, though they display separately.
Resetting 18K & 36K service: Turn off power. Hold down "On line" while turning on power. Continue to hold down "On line", until 18K or 36K displays. Press "Enter". When "Sure?" displays, press "Enter" again.

PANASONIC 4420

TROUBLE CODES

Most are self explanatory, and are clearly spelled out in the display. Here are the ones that are not too clear and/or that require a service technician.
Toner cup full: Means the waste toner bottle is full.
No toner cup.: No waste bottle installed.
E13: Toner adding problem. This means there is toner in the hopper, but the density will not adjust. Could be caused by toner feed problem or generic toner. This machine works much better with OEM toner. I do not usually make recommendations, but in the case of this machine, this is a must.
E20: Laser motor.
E25: Main motor drive problem.
E26: Fan motor problem or missing 24 volts.
E30: Fuser has overheated.
E31: Low fuser temperature. Bad solder joints on power supply (very common).
E35: Laser diode problem.
E50, E51 Read/write problem involving standard DRAM.
E54: ROM check sum error.
E56: Internal font ROM check sum error.
E57: Optional font ROM check sum error.
E60: CPU to RAM communication problem. E66: RS-232C error.
E71: EEPROM problem.
E82: 36K service. Fuser and transfer corona.
E83: 18K service. Ozone filter.

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