Temporary Error: Power off for 20 minutes to allow the capacitor on the DC controller to fully discharge. If you don't allow this capacitor to discharge, you will still get a Error 50 even if you have fixed the problem.  This may clear the error - either temporarily or permanently. If it clears the error it was most likely caused by a low power problem  i.e. low line voltage causing the power supply circuits to drop out of regulation. Low/unstable power (low line voltage, brownout condition).  If it doesn't clear the error you may have one of the problems listed below The HP LaserJet II/IID/III/IIID, Apple LaserWriter II series and many other Canon SX engine based  printers have two common causes of the Service Error 50, a failure of the Triac in the AC power block assembly which requires rebuilding or replacement of the assembly, and a failure of the 14 tooth gear on the fuser assembly causing the roller to either become jammed or not turn at all due to a broken tooth on the gear. Other possible causes are the halogen heater lamp, the thermal fuse or the thermistor. The halogen heater lamp may be burned out, it should have less than 5 ohms of resistance between the two pins of the connector on the right end.  If it measures as an open circuit the lamp or thermal fuse is burned out (these parts are connected in series).  If the error can be reset by turning the machine off for 20 minutes, it is most likely the AC power block.  This condition will only worsen until the error 50 is constant.  If the lamp begins to heat (you can feel the roller, but be very careful it's HOT) its not the lamp or the thermal fuse and is most likely the triac (can replace with NTE 5608) failing when current is drawn by the halogen heater lamp.  You can often verify the AC power block as the problem by opening the rear door of the printer and observing the heater lamp glow when turning the printer on - a dark room is best for this test.  Another clue can be a "clicking" sound just prior to the error 50 appearing.

When replacing the triac, you often need to replace the solid state relay and possibly two resistors.  It can be a labor intensive task requiring soldering skills (you don't want to peel those pads!).

 Many times, although not resulting in an error 50, the upper fuser roller simply becomes worn, the teflon coating begins peeling and a line can result on the printed page. You can check for improper fusing in the area around the line by running your fingernail across the print. It should not rub off! In these cases, the entire assembly must be replaced. It is not cost effective to replace only the defective part - upper roller, single gear, etc. It's like tearing your engine apart to replace a single piston ring.

When you purchase a remanufactured fuser assembly, be sure you know what parts have been replaced and if OEM or after market parts have been used. Like anything else, there are both acceptable and exceptional parts available. We supply fusers which have been remanufactured using only the highest quality parts available and we replace little things like the white rollers and the gear arm and separation claws. It's the same old story, you pretty much get what you pay for. All our remanufactured fuser assemblies carry a one year warranty.

Our price is $69.95. If you bring the printer into the shop, the 3/4 hour of labor includes a complimentary 12 point cleaning of your machine and a complete check out. We also recommend you replace the Ozone filter at this time. The ozone filters are UL rated and equivalent to the OEM and priced at $15.95 or $19.95 depending on the age of your printer and the type of filter required.  Check to see if you have the green access door just in front of the upper cooling fan in the right rear corner of the printer.  If not, you have the older style filter which requires removal of the top cover to replace the filter. We also have upgrade kits which include a new filter housing with the external access door and the filter.

On HP laserjet IIP/IIIP/Apple Personal LaserWriter printers, a Service Error 50 is most likely due to defective heater lamp. The halogen lamp burns out and can be replaced quickly. You can check this by observing the coloring of the lamp, it should be clear with the filament visible. To observe the lamp, you must first remove the fuser assembly from the printer.  The assembly is located on the door of the printer and is the black felt/fuzz covered assembly with the "Warning High Temperature" imprint.  To remove this assembly, remove the five brass colored screws.  Slightly flex the housing and lift straight up and out of the printer.  On the left end of the assembly you will see the ceramic lamp end with a white wire connected to a terminal.  Remove the screw securing the lug to the terminal. Next remove the clip securing the lamp. On the right side of the fuser is a set screw - look in the area of the cover latch.  Loosen this screw. You may now slide the lamp out of the fuser assembly.  Do not touch the glass portion with your fingers as finger oils will create hot spots and cause premature failures.  If the lamp is discolored it's developed a leak at the glass to ceramic seal and the filament has oxidized and is burned out. Occasionally, the power supply is at fault, usually on older machines that were manufactured early in the product life cycle. A manufacturing problem causes premature failure of the power supplies. To identify if you have one of the suspected power supplies in you HP LJ IIP, first check the S/N. This problem applies to S/N's below 2951JXXXXX. If your S/N falls in the range, then look for a RED dot on the power supply in one of two locations. You will have to remove the covers to do this. The first location is just above the AC inlet either on the P/N label RG1-1782 or to the left of the label. The other location is on the side of the power supply on the P/N label. If you do not have the red dot, then this is probably a defective power supply causing the 50 Service error. We have replacement power supplies available.

On the HP Laserjet 4/4M/4+/4M+, our experience so far has shown the halogen lamp to be responsible for most error 50 problems. The thermal fuse and thermistor are also possible causes of a 50 Service error. You can remove the fuser assembly from the printer and measure the resistance of the lamp/thermal fuse circuit - it should be less than five ohms.  Measure between the two heavy gauge pins on the fuser assembly connector. If you measure an open circuit, the problem is most probably the lamp. Removal of the lamp, although not difficult, requires knowing where the snaps are located to remove the plastic covers. We carry this lamp in stock and can replace it in three quarters hour of labor.  We are working on instructions to include with the parts detailing the replacement procedure.  Please let us know if you would find this useful.  See the  parts page for pricing

On the HP LaserJet 4L/4ML, errors are indicated by a series of indicator lights.  This printer has four lights, Paper Jam, Paper Out, Data, and Online. " HEIGHT=50 WIDTH=48 ALIGN=ABSCENTER>

If all four lights are on, press and hold the blue panel button to display a secondary light pattern.

An error 50 is indicated by the ready and error lights with the blue panel button pressed.
Turn the printer off for 15 minutes to see if the error clears.  If not, you will need to remove the fuser assembly to perform further checks.  This requires removal of the cover an unpleasant task and measurement of the fuser terminals.

The HP LaserJet 5P/6P indicates service errors in a similar manner to the 4L/4ML except there are 5 indicator lights.  If the first four lights, top to bottom, are lite, press and hold the GO and RESET buttons.  If the paper jam light is lit, you have a Service Error 50.  Again, power down for 10 minutes or more to see if the error resets.  If not, you may have blown fuses on the DC controller board or a DC controller failure, but in most cases you will need to replace the fuser assembly.  We have this assembly available on our page.

ERROR 51 (Loss of beam detect)
           IIP/IIP+/IIIP

• Improperly seated toner cartridge - remove and reinstall
• Laser shutter blocked or damaged
• Damaged fiber optic cable
• Defective Laser PCA - replace

II/IID/III/IIID

• Defective toner cartridge - Replace with different cartridge, even empty for testing
• Bad or loose cable connectors - Scanner to DC Controller - check and tighten connector pins at both ends of cable
• Damaged Fiber optic cable - examine for cuts or kinks, replace as necessary
• Defective Scanner Assembly - Replace  RG5-0050

IIISi/4Si

• Defective Toner Cartridge - Replace with different cartridge, even empty for testing
• Fiber Optic cable - examine for cuts kinks, nicks.
• Faulty Connectors - Check J002 on DC controller and J601 on Laser PCA
• Low DC Voltage - Verify 12 VDC at J601-2 on Laser PCA
• Defective Scanner Assembly - Replace Laser Scanner Assembly

4/4+/5

• Faulty Laser Scanner Cable Connectors - Remove and Reseat connectors
• Defective Laser Scanner Assembly - Replace RG5-0049

ERROR 52

A service error 52 (Apple Personal LW series indicate this error with the two lower lights flashing, QMS PS410 printers with the error light being lit) indicates incorrect scanner speed and is generally the same as an error 51. This is a very common failure on the laserjet IIP/IIIP, Apple Personal Laserwriter, QMS PS410 and other Canon LX engine printers. This error can begin as an intermittent error which can be corrected by pressing Alt- continue (on HP printers) but it's only a matter of time until you can no longer correct it this way.

Early models of these machines had a scanner assembly which contained a manufacturing problem causing the scanner speed control IC to overheat and burn out. This is sometimes indicated by the very distinct and pungent smell of a printed circuit board burning. When the defective part is removed, the board material under the speed control IC is usually burned. The upgraded assembly part number is RG1-1771-030 available for $69.95, and includes step by step replacement instructions. The scanner motor assembly on this machine is buried deep in the center of the printer, it requires three quarters of an hour labor to change.

We have seen this failure on machines with either very low page counts - 2-3K pages or between 8-12K pages.  Of course it can happen at any page count.  On the HP IIP you can get the page count by holding down the "ONLINE, MENU, and ENTER" keys while turning the printer on. Then press the "FORM FEED" key and then the "ENTER" key.  You will see "00 SMODE" in the display, then "05 WARM UP" and finally the page count will be displayed.  On the HP IIIP the page count is given on the test page and on the Apple Personal Laserwriter it's on the start up page (except the LS).

Heat and moisture are likely to aggravate the problem and induce failure.  The replacement parts which are made for Canon by Toshiba, do not have the manufacturing problem. In very rare instances, the laser diode itself will be the cause of failure, usually resulting in an error 51. Listen to the scanner motor, it should have a distinct "whirring" sound as the printer prepares to print. Once the proper speed is reached, it should stabalize and the printer should print.  If you don't hear the motor at all, usually accompanied by an error 52 indication, the scanner motor is defective.  If you hear the motor spin but not stabalize and you get an error 52 the scanner motor is most likely defective. If you do hear the motor reach speed and then you receive and error 51 you may have a defective laser diode although this is fairly rare.  We also have this part available, RG1-1769.

On the LJII/III and the Apple Laserwriter II series, this error is generally caused by loose connectors and may be indicated by an error 51 message. Many times the scanner motor will rev up and fail to stabilize - indicated by a whining motor sound.

A common solution is to tighten the connectors at both the scanner assembly and the DC controller. This is accomplished by removing the connector from it's mate and tweaking or bending in slightly on the connector tabs. When reseating the connector, use a small flat blade screwdriver to fully seat the female connector ends. You may also find the tie wraps on the wire harness are to tight, pinching the wires and causing an open or short. Simply cut these off.  Occasionally, the scanner motor will fail in which case it must be replaced. The part is in available on our  parts page. Replacement is fairly straight forward requiring removal of the cover assembly, fiber optic cable, two connectors and four screws. We have found it is highly beneficial to replace the wire harness assembly and fiber optic cable when replacing the scanner since by this time you have probably already tried tweaking the connectors. While this involves more disassembly, our experience has shown it to be a worthwhhile effort. These parts are also available on our parts page.

On the LaserJet 4 Series, an ERROR 51/52 is usually an indication of a defective scanner assembly.  You should check for loose connections first of course.

ERROR 53

On the HP Laserjet 4L/4ML/5L this error is indicated by the data light on and all other off.

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4L/5L
1. Error found in RAM(or ROM, 5L only) - power cycle the printer
2. Defective or incompatible memory card - remove card and power cycle the printer
3. Defective formatter PCA - replace
On the HP Laserjet 4/4+/4Si/4V/5/4P/4MP the 53.XY.ZZ error code is decoded as follows:
53 (XY-ZZ) where

X- Hardware Type:
0 = ROM
1 = RAM

Y - Hardware Device:
0 = On Board RAM/ROM
1 = SIMM Slot one
2 = SIMM Slot two
3 = SIMM Slot three
4 = SIMM Slot four
ZZ Error number:
00 = Unsupported memory
01 = Unrecognized memory
02 = Unsupported memory size
03 = Failed RAM test
04 = Exceeded max RAM si
ze 05 = Exceeded max ROM size
06 = Invalid SIMM speed
07 = SIMM reporting incorrect
08 = SIMM RAM parity error
09 = SIMM ROM mapped to an unsupported address
10 = SIMM address conflict
11 = ROM out of bounds
12 = Could not make temporary mapping
*A 53.1y08 error is generated in LJ4+ memory is installed in a LJ4 The 53.03.01 error code is decoded as follows:
A ROM error in SIMM slot three with unrecognized memory.

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Error 54IID, IIID Only: Duplex Feed Error
1. Check Duplex Shift Plate for correct position and operation
2686 A/D Only: Main Motor Stall
1. Paper Tray is overfull
2. Fuser drive gears bent of locked up

Error 55
On IIISi/4Si Printers this is due to the DC controller not receiving the proper information upon startup.  Check the connectors on the DC controller and power supply.  If you don't hear the motor immediately and you don't have a paper jam, change the power supply.

Error 58

4/4L/4P/4V/5/5P Check the fan cable - reseat cable or replace fan

4V/4MV Defective DC controller board - replace

IIISi/4Si Error 58.1 & 58.2 Improperly seated paper cassette

ERROR 62.X

62.0 Service, 62.1-4 Service, 62.5 Service, 62.6 Service All Printers

1. Improperly seated SIMMs or font cartridge - remove, check/clean contacts re-install and try again. Try with SIMMs or font cartridge removed to be sure error clears.

2. Defective Internal Memory - Replace Formatter PCA, check all cables first!

ERROR 67 Defective formatter PCA

2686A/D, II, IID, IIP,III,IIID,IIIP,4,4+,4P - Defective formatter board, try reseating the connectors and any accessories you may have plugged in

On the 4Si this could be a temporary error which can be corrected by cycling the power

4V/4MV - This can also be a temporary error or a defective paper guide plate assembly. A switch on this assembly may not be activated properly. You can remedy this by replacing the paper guide plate assembly, RG5-248-030. Caution needs to be used when installing the new assembly - be careful of the sensor flag spring!

5Si - Can be caused by field replaceable units (FRU's) not installed correctly. Check and reinstall.

Error 79

Software/drivers, Memory PCA's, Font-Macro-Personality Cartridges, option I/O Cards. Defective toner cartridge in the Laserjet 4 Plus only. Remove any accessories (font cartridges, memory PCA's, SIMMs, etc.) plugged into the formatter card and try again. If the problem persists and is application specific, verify proper setup with application vendor.

Defective Formatter PCA - Replace with known operational board and try again.

ERROR 80

ALL Printers

Improper MIO connection - look at pins on formatter MIO connection

Defective MIO Card - Replace card

Defective Formatter Card - Replace card 

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