Copier Tip Archives
For more current information, use the Bulletin Boards.

SF-A51 doc feeds
Parts are getting expensive (OEM) so try this. The Sharp SF 8500 duplex tires can replace the tires on the ADF exit (pre turnaround).  The turn around roller (the big one) can be replaced with a cut down Ricoh roller. The ADF entry roller, which sends the original to the glass, can be re-tired with canon feed tires.  Check your local supplier for sizes.

SF-A51/A11
If you are getting jams in these ADF's and the feed rollers are new, clean or replace one-way gears in ADF(4 of them). Symptoms are: won't feed in orginals and jams(like faulty feed rollers) or jams while doing 2nd side. Make sure you also clean the reversing document sensor. This also applies to the SF-9750/9800 ADF's.

SF-A51/A11
Do not clean the four small counter roller belts with a solvent!! Use WD-40. This restores the belt. These belts will fail and cause ADF misfeeds if dried out by solvents or alcohol. Sharp training centers are also suggesting the use of WD-40 on feed paper stop rollers. Just make sure you work it into the rubber well. No moisture should remain on roller. It works very well and does not damage rubber like some solvents. Also restores belts already cleaned with solvents. 

SF A54
Doc feed jams and lead edge problems on the SF-A54 can be caused by the one way gears in paper feed drive unit.You would save call backs if you replace all 3 one way gears and the shaft with the 2 one way gears.These problems can be hard to pin point.Cleaning will help,but you will be back.

SF-S11 Sorter - Jamming
It doesn't matter if you're in non-sort or sort mode. It’s easier to detect while using non-sort. The symptom is a sluggish exiting because something is loading the motor. I discovered that the brass bushing on the black belt (suction) shaft (upper front frame) needed cleaning. After cleaning, the symptom halted. The bushing may have been dirty from dried out oil which was applied due to prior troubleshooting. You may want to give second thoughts before lubricating these bushings and/or others in the equipment.

SF-S14 Sorter - Causing F1-(00) codes.
Re-crimp wires that are forced into pins in the plastic jacks on sorter board. Rubber insulation expands and forces wire out of piercing wedge of metal pin in plastic jack. Problem can return many months or years later. Don't be surprised.

Machines with Masters

To prevent copy quality problems....when installing a new master I use electrical tape on the underside of the master that goes into the hold down clamp...also make sure that the area is vacuumed out completly

COPY QUALITY PROBLEMS
If you have a problem with the master wearing out before a PM is due check developer mylar (above mag roller) if it is black and hardened it will scratch the master and leave lines and black spots on the copy. Remove and replace only the mylar not the plastic support underneath it. Try a roll of mylar from Alternative Technical Services @ 1-800-343-3533 part # 349 and two sided tape # 332. This should work and can be used on many machines for the recovery blade in the cleaner box. The OEM blade is very expensive and should be avoided if possible.

If you are getting banding (dark lines across the copy) check the master under the clamp if is transparent it will cause the bias to short out. There is a conductive strip Sharp has to correct this problem the bulletin # is SF-700-062 and is dated 4/11/84 if still available this will help, if it not make sure the pad and clamp are clean and use electrical tape on the pad as previously suggested.

If the copy has large void areas on it, check the separation assembly, if the plastic guide and tape are worn replace it, also check the guide roller the plastic guide rides on it could also be worn.

750/755/756/760 series machines
Symptom:  Machine runs on and on and never comes to ready.
Solution:   What's wrong is that the master-positioning sensor never sees the home position of the master due to its being clogged up with toner. These machines run REAL dirty and need constant cleaning of the drum/master area. Originally, I thought the machine was adding toner but 10 minutes later, it still never came to ready. Weird. Was able to take my canned air and blow the sensor out temporarily to get it going. This may be a last resort but taking the thing into the shop for a master cylinder removal and THOROUGH cleaning is the only way to guarantee a not so quick recall for this problem.  Then of course, properly replace and calibrate (on the lean side) the developer.

2000 Series

Problem: Duplex jams on all 2000 series.
Solution: Adjust the alignment plates of the duplex unit. The default is set at 7. If jamming occurs in duplex adjust to 5. This adjust the plates to allow for some "play" Paper tends to bind if the plates are too close together. Lowering the value widens the space between the plates.

Problem:  Paper wrapping around fuser roller and jams.  The exit roller is on the door on left side of copy.  This door gets
slammed pretty hard by end users, resulting in bending exit roller shaft. 
Solution: If you will remove gear and bend shaft back towards copier slightly, you will find that this improves paper feed from fuser.

Worn transfer guide causes mis-feeds
This is the white, enameled guide attached to the corona assembly. A flat spot develops on the guide at the very top of the guide where the paper moves across it. After about 100,000 copies the enamel wears through to bare metal, causing mis-feeds. Two symptoms: 1. Paper stops dead on the transport belts, and 2. Paper stops momentarily on the transport belts so the paper's late getting to the fuser/exit. Happens much more during humid weather than dry. Happens only with 8 1/2 X 11 paper. Happens mostly with cover-up copies where the copy has large black borders on the front, rear, and trailing edges. I've seen this with 2030's, 2025's, 2040's, and 2022's. It probably also applies to other 2000 series, but I don't service these other models so I don't know for sure. The fix is to replace the transfer guide. On the 2030 and on some other models, you should also replace a Mylar sheet on the transfer guide.

2010 family

DRUM CARTRIDGE
The drum cartridge on these machines will frequenlty wear prematurely. The cause is the drum drive. A pin and four flat surfaces. The metal pin will rub againist the the plastic flats of the drum drive gear as it drives, waering out the drum drive gear. A small amount of grease on the flats before installing a new cartridge will prevent the premature wear.

2X14
BYPASS FEEDER
Sometimes these feeders don't feed properly from new. We've found that
the seperator roller assy. has a couple of washers on it to adjust the
tension of the braking spring.
If it misfeeds remove one (or more) of these washers.

SF-2014 through SF-2514
Skewed copies or jams at pre-registration roller
When unpacking and setting up these machines, DO NOT grab the lip of the bypass when lifting them out of the box.  This can deform the metal upper paper guide and cause skewed copies and/or jams. If this has already happened, you can cure it by applying pressure to the bypass assembly just below the tray extension, thereby undoing the damage.

2020
Symptom: Waste toner overheats and hardens in bottle causing "little man
light" to flash before waste toner is full.
A Solution: Use aluminum tape (heater duct tape), apply to underside of
waste toner compartment on drum unit to shield from heat. Also you might
want to lower fuser temp to 170. Some work well at 160. This tape is
fairly expensive, but worth it.

2022 / 2027 / 2035
TONER PROBLEMS
If you're having toner yield problems or the toner light comes on and there's still toner in the cartridge, most likely the toner hopper shaft mylars loose in the hopper. Every machine I have checked this is the case. Sharp has redesigned the shafts for this problem. The part #'s are CSFTZ2114FC51 and CSFTZ2114FC52. More info is in tech bulletin SF-2035-006. You may be able to only remove the loose mylars and it may work ok.

2035
DARK COPIES
The SF-2035 sharp copier has a dirt correction feature that can save calls or cause more work on a call.If the copier is half way or more into the 80k pm cycle and cleaning the lens and mirrors doesn't give you clean enough copies then using T/C 46-01 will cause even darker copies because once you press print to change input value you reset dirt correction feature.TIP!!! Press P (program button) value is stored and dirt correction is not reset. Saved me time on many a call.Hope it will help you as well.

GEAR NOISE
If you hear a strong grinding noise coming from the back of the machine, first find out if it originates in the developer section, all the way to the left (when you look from the back of the machine). Or, it may be caused by the gear box in the middle of the machine.
If the cause is the developer section, you will need to replace the yellow coupling/gear that drives the developer section. You should also replace the shaft on which it seats because it is probably worn. If the noise comes from the gear box, you must take the unit completely apart, clean the slide bearings and re-install the unit after you replaced the worn gears, if any. If you just spray oil, you will be back very shortly.

2050

ADF EXIT JAMS
Possible cause could be white feed belt slipping. If belt has over 150k might want to check.

SF2014/2114/2214

When the drum is replaced you turn off the mechanic light using crop code 24 sub code 7. This is not in the Service manual.

SF-2116, 2118, 2020, 2120
Symptom:  Waste toner hardens in the waste toner bottle.  
Cause:  Excessive heat in the body cavity of the machine.  
Solution:  At the paper exit side of the machine, remove the cover, remove the cooling fans and remove the ozone filters located BEHIND the fans.  (These filters get clogged easily and prevent proper air circulation in the machine.  The heat build-up will also cause early drum failure.  I have been disposing of these filters without any adverse effects).

SF-2116, 2118, 2020, 2120 
Symptom:  False waste toner light (machine shuts down)
When you are called out to empty the waste toner bottle, due to it really being full, the damage is already done.  The end of the waste toner auger that goes into the bottle is sharp enough to sew with.  When the waste toner fills up it pushes the auger into the waste tube and the end begins to cut grooves in the "reinforced" section of the tube.
Solution(s): The most effective way to solve this is to just replace the tube.   A quick fix however is to remove the tube, clean it and, with a round file, file out the grooves.  Simulation 15 clears the light.

SF-2118, 2116, 2120, 2020 Paper Skews
Check the white plastic pressure roller assy under paper feed section.  The rear roller gets stuck in the up position causing a skew.  Just press on the roller to unclick it from this position and there will be no more problems.  Be sure to show the customer how to do it.

2116/2120

SHUTTING OFF
Problem found in many of these machines is that the customer calls in that
the machine is turning off. Problem is not electrical it's that the door
switch actuator is too short. Fix by pulling front inside cover (need to
pull op panel too) remove actuator (plunger type thing with 1 screw) and glue
small circle of flat plastic to the rear of plunger, and reassemble.Good idea
is to  do this when setting up machine in your shop before delivery.

2116, 2118, 2216, 2020, 2120 - Occasional no feed from cassette(s).
Be sure feed-in tire moving arm doesn't slap up in to the foam pad above it with the thin ribs of the arm assembly.
The arm assembly has ribs which bury itself snuggly into the foam silencer cushion. The foam then holds the arm
from dropping down. Put tape on top of the arm to keep it out of the foam.

2118

Proper Cooling
Modification to upper left cover is needed to ensure proper cooling of this machine. Also tell the customer to keep this in one of the coolest rooms in the office! This machine must be kept out of the closets!

2214

DF HINGES
The doc feeder hinges (especially left one) break frequently and have
been modified at least once. Latest part #'s are: Left Hinge
MHNG-0178FCZ4, Right Hinge: MHNG-0179FCZ4 . Not positive if 0179 ends in
4 or not but should not matter. Pricing found to be $25-30 ea.
Left one breaks more due to higher spring load within. When it goes, it
may knock the connector off the sensor above it resulting in jamming
symptom.

SF-2216
Problem: Paper hanging half way out the fuser then stopped.
Solution: Replace the POD PWD, P/N CPWBF1084FC51, after and above the fuser unit.

SF-2530
I had an SF-2530 that when turned on would start the warm up cycle then turn itself off after a couple of seconds and restart itself and would keep on doing this and never go any farther in the warm up cycle. The cause turned out to be a short on the main motor board, replaced the main motor and that took care of the problem.

3062

TRANSPORT BELTS STICKING
Symptom: Machine makes loud noise and completely locks up goes into
status code. when tech resets code machine runs freely. Recall waiting
to happen!
Cause: Transport belts leave tracks on assembly underneath. This buildup
eventually adheres to belts causing them to wrap around shaft and freeze
up machine.
One Solution: Clean underneath belts with soap solution. Dry and apply
starting powder underneath belts. Do this at every pm.

Locked-Up Fuser Bearings
These bearings can be recycled by soaking them in transmission fluid for a few days. We have tested this on several machines and bearings have lasted over 500K. This should not be standard practice, but having a set of these "recycles" around beats a down machine.

Cutting off in copy cycle
Will act just like a high voltage short, op panel will go blank then will come back up, only won't show c-2 code . Found main sw to be flaky. Go figure.

5700 
Nearly Blank Copies
Customer was getting nearly blank copies. I realized the dv gear was not turning. I finally figured out that the one way gear and bearing in the gear box was overly greased by sharp causing it to slip. I cleaned all excess grease and problem was solved.

7100
Scanner Clutch Parts Breakdown
Sharp technical bulletin # SF  7000-022A is a full break down of the clutch with individual part numbers, the are easy to repair, almost always new rubber o-ring plates will solve the problems all the same in 755 and 756 too. All parts still avaliable up till now.

7100,755,756 Copiers CH code
A solid CH code can indicate a blown copy lamp thermal fuse. The fuse is located in the revovable optics/lamp unit. Be sure to clean exhaust filter located to the left of optics unit. (access is through top cover plate left of optic unit.

7200

JAMMING AT TURN AROUND
Historic problems with the turn aound door on right frame side may be corrected by some innovative thinking.  Remove and stretch the springs that force the little white rollers mounted on the door.  You may also want to peel away, and remount the mylar tabs and position them about 3mm. towards the inside.

7300 SERIES

Outer Fuser Bearings Breaking
Place a washer that just clears the fuser rollers diameter but is small enough to be held by the retaining clip on the front bearing between the bearing and the retaining clip.

CROP CODE
Crop code for toner density Is "COOP 44 Cassett button" the higher the number the less toner the lower the number the more toner, This works well and do not be afraid to change it quite alot, But every thing need be in good condition first- this mean no EE codes or such other conditions.

INTERMITTENT VOID AREAS
The guide above the transfer corona (guides paper up to drum) is
adjustable on this machine. You might want to try moving this around if
you are getting intermittent void areas.

JAMMING AT THE EXIT
Paper jams at exit, half way out of the copier.
Most of the time this hard working Sharp works well. Try taking the
exit panel out and get to the exit switch. Clean it well, vacuum..etc.
This should solve the problem. (Technician from Ontario, Canada)

H4 CODES
The cooling fan goes bad and generates false signals. Replace the fan
if everything else checks good. It may also cause intermittent power failures "machine goes dead".

JAMMING AT THE EXIT ROLLERS
Can be caused by the picker fingers. They come with a little gear like paper guide. If they are not there the paper rises up and catches the top of the upper exit rollers.
PAPER FEED
Be sure to clean the first and second paper feed clutches with a light oil...they come packed in a heavy black grease... also check that the right side panel is on correctly....I have found a lot of these put on wrong.
PAPER FEED
Sometimes on this machine the lower pick off fingers can impair feed. To solve this problem just remove the lower fingers. You can do without them.

7300, 7350

H-3 CODE
These machines will give you a false H-3 code. It's almost always the cold solder joints on the transistor on the main board. Resolder and no more H3's. If very loose can also cause a dead machine.

7300/7370

CASSETTE JAMMED
Cassette is hard to get in or out.....check to make sure that the paper feed unit is put in correctly....the lead edge of the paper feed unit must go under the conveyance unit.....or this will push the conveyance down causing the problem..simple...but I see it alot...
JAMMING
Jamming at the exit....there are two guide rollers at the exit...sometimes they loose their spring and cause the paper to hit the metal parts that hold the roller....easy to check.

7320/7370

Blank copies
Found cold soldering joints on copy lamp regulator board. Remove board from copier under front cover display and re-solder four pin connector.   

H3, H4 CODES
Check the fuses on the power supply, after all the usual stuff.
TONER PROBLEMS
When you go into diag. code 25 to level D.V. be sure to hit the cassette button...this will make sure it doesn't under or overtone.
H3 CODE
If you have tried to fix the main board and that doesn't work....then its the power supply.
HEAT LAMP FAILURE
On the Sharps 7320&7370 series Check the fuser heat roller for a metal guide plate in side on the rear side of the roller if one is seen take it out it will cause premature lamp failure by cutting into the ceramics of the lamp.
DV UNIT COARSE ADJUSTMENT
Between PMs it occasionally is necessary to decrease code 44 value to boost solids. On some machines the code 44 value may already be too close to 0 to adjust. ( values below 10 seem to cause problems ) On the bottom of the DV unit behind thin black plastic strip, lies the developer sensor. Pull away yellow or white paper decal to expose hole with soft core worm screw adjustment. The square key hole is smaller than those found on Toshiba's 4121s, etc. A 1/8th turn ccw will boost Code 44 values 40 to 60 points upward. Note, this may hamper Code 25 CA after developer replacement with an E Code above 99. This has been implemented on several machines for approximately 10 to 12 months with no DV mix ratio problems period.

In most of the cases I've faced related to main motor failure in Sharp's 7320 and 7370 this "death" is no more than a "mental comma". After disassembly I've found that either or both wires of the motor's brushes are "misrouted" avoiding full brush contact. Hmmm! 10 more minutes could cost a lot less bucks!

7320/7370/7900

COPY QUALITY
Overtoning and toner spray. You must set up code 44 to a number that is five digits higher than that in code 25 and this will prevent this overtoning problem.

7370

NO MAIN MOTOR RUN? NO CODES?
Might start with a paper jam then just won`t run. The problem may be PT (photo interupter clock) inside main motor plastic shroud. Clean or replace it. The part is not in the parts book, P/N is VHPGP1A/-1, the package says HOTO COUPLER, think it should be PHOTO COUPLER.

PAPER OUT INDICATOR
On the Sharp 7370, if you press the print button and get a paper out indicator, and when you bypass copy you get a jam indicator, check to see if the main motor is turning on when you try to copy. Be certain to listen for the main motor and don't mistake it for the cooling fan. If the main motor is not starting up, the paper feeder will not work, thus a paper out indicator from the cassette feed and a jam indicator from the bypass. The main motors in this machine are very high mortality.

7370
Problem: Copier would not go into initial rotation after coming out of warm-up. 
Solution: Drum blade was flipped, which had blown fuse on motor driver board.

7700

L4 CODES
Main motor inoperative. Try resolding joints on main motor PCB. Cold solder joint.

7700-7750
COPY QUALITY
If the copy is lighter on the void side of the copy with blank areas,
check the lens mount, after the lens is cleaned it may have lifted out of
the tracks. The lens will still travel without problems so there are no
indications of the problem.

JAMMING IN FUSER
If the copies jam or buckle when the lead edge enters the fuser assembly
clean or replace the lower fuser bushings, replace the fiber bushings
with metal ones #NBRGC0053FCZZ

BLACK COPIES
If the exposure lamp comes on and then goes out when the scanner moves
further, check for a break in the wire harness to the lamp. The part
number is DHZI-1304FCZZ and needs to be soldered in place.

CLICKING NOISE
If the machine makes a clicking noise when running check the registration
clutch, the gear cracks causing the noise and sometimes paper jams. Part
number NGERH0434FCZZ.

SF 7800

U2 CODES AND SCRAMBLED MEMORY
Performing all the suggestions on the factory bulletins had no effect. In this case, the charge corona was arcing to grid in the area of the rear block. Sharp figured a cover wasn't necessary (duh!). Covering the end blocks with tape cured this problem which was previously happening once a month.

7800/7850

7800, 7850 MAINTENANCE LIGHTS
The maintaince light has two meaninings. The light on constantly means the maintenance cycle is up (normally 30,000 copies). Crop 20 clears it. The same light blinking means the drum toner waste is too full. This lugs down the auger causing the spring drive clutch to push a micro switch on the back frame. Cure it by removing the drum pull the plug on top, dump the waste toner in a trash bag, run crop 25 for about 15 seconds then crop 14.

SERVICE INDICATOR - NO CODE
Check the drum unit it maybe full.

JAMMING
If you experience intermitant false jaming with the paper stopping in or near the fuser assembly, check the lower fuser roller cleaning roller. Gumed and/or worn cleaning roller bushing can cause the lower fuser roller from turning freely causing the intermitant jams.

7800/ 7850/ 7855

COPY QUALITY
Dark line going from front to back about in the middle of the copy.....the guide plate going into the fuser unit is bent too far down...causing the paper to "bump" into the lower roller.

7800/ 7855

WHITE LIGHTNING TYPE STREAKS
Most frustrating ! After trying EVERY OTHER TYPE AND THICKNESS of corona wire to restring the main charge, I was advised to replace the wire with the exact 50 micron OXIDIZED WIRE. (supposedly the exact same as the OEM ?? )  I could not believe it, but this solved the problem. Other types of corona wire that I had used lasted about 10 or 20 copies and the problem reappeared. Was able to purchase the spool of wire from Katun.

7850

L6 CODES AND BROKEN CASSETTES
Skip those updates by Sharp. Order part# VHI27C51243FC. This is a 7855 main board I.C. This will tell your 7850 it is a 7855. This is not a tech bulletin. It works well. We have done dozens of machines. This part costs about $40.00.

JAMMING
Sharp 7850 Jamming at suction belts or feeding into fuser rollers.
Observation: Look at the paper just as it feeds into the fuser rollers. If it hesitates, you may be experiencing a friction problem from the infeed guide of the transfer corona. It has a mylar strip which wears down on the edge, exposing bear metal. Solution...Cover the guide with mylar or teflon tape, or replace guide asm.
Update about putting teflon tape on corona in feed ramp when experencing jams because of friction on bare metal, it's the glue from the worn away mylar sheet. The part number from Sharp to replace the whole mylar sheet is PSHEP2701FCZZ, TC sheet upper. Works great.

7900

U2, PARTIAL BLANK, FULL MEMORY SCRAMBLE
On any of these problems I would take out the drum unit and shake and roll it around; if you hear any rattle or sound of any kind, replace the drum immediately, or you will regret it. The ground has come loose inside the drum assy. and it creates problems worse than a charge grid ever thought of.

INTERMITTENT BLANK COPY
The main corona unit housing builds up with "corona scum",
and requires cleaning.

U1/U2 CODES
Don't go right to the battery! An arcing transfer/separation corona will produce the same problem. Found out the hard way!

RANDOM CODES
If you are experiencing random codes there is an additional solution
without replacing a lot of parts. The codes as indicated previously in
this section is caused by main charger grid arcing. Make sure you are
using the new style grid and corona blocks, then when you install the
unit secure it by using a paper clip or similar object and fasten to the
screw just above the front corona block. The problem is when the corona
vibrates out of the machine just enough to cause arcing. This may sound
tacky but it has completely cured this problem and it has not happened
since it was done.

SHADOWED COPIES
If your are getting shadows on the copy and you have to constantly clean
the optics to get good copies don't forget to clean the filter glass
above the developer unit. Open the developer drawer and remove the top
panel and the black plate holding the filter glass, slide plate out and
clean both sides. Make sure you get it on the tracks when reinstalling.

SCANNER SLAMMING
Cause - Leaking primary corona block sending noise to scanner control board.
Remedy - Replace primary corona. LOGIC PROBLEMS
Machine does initial warmup ,but you press start key and machine goes haywire. I replaced corona's, logic board and even the power supply. This machine gave me hell for a month. I finally replaced the whole drum unit and I have not had problems ever since. So if possible have extra drum unit instock the're expensive but you save time and make more money!
LOGIC PROBLEMS
Sharp 7900 intermittant U, L, or H codes and/or jamming...A loose screen grid will cause electrical "noise", and will confuse the main board. Broken fuser drive coupling gear.
For a quick fix use the gear next to the paper advance handle on the bottom right, front frame side. It is the same one and will not impair operation.
Closely inspect all the gears near the fuser cleaning drive before ordering parts.
LOGIC PROBLEM
Symptoms, Synch (refeed) clutch does not fire (sensor is good, clutch is good) Blanking lamps intermittenly print whatever part of the copy they want to print. Random U1s and U5s (maybe other Us as well)
Did you just change the charge corona wire? If so did the little tabs on the assy. break? if so, change the assy and the problems will go away.
U1 CODES
Check the number one corona unit and replace if necessary. Sometimes this corona unit can cause this code. COPY QUALITY
Toner problems. If the toner dispensing can't keep up with the consumption, check that the mylar blades inside the toner unit are not binding. They have been known to become warped and get stuck as they turn to stir up the toner. You can fix this by just cutting off the warped part. It will still work and you can save the time and expense of replacing the part.
COPY QUALITY
7900 intermittant blank/Partial copies. Make sure the charge corona wire is tight. Sometimes, it oscillates and grounds out to the corona shell, causing blank or partial blank. If blanking lamps stay on when they're not supposed to (causing a similar symptom), The mirror motor PWB may be heating up and sending a false "on" signal to the blanking lamps.

SF-7900/8300

LIDS
Replace those filmsy or worn out platen covers with SF-7800/7850/7855 lids. Most customers prefer a solid lid. These lid will last longer also.

SORTER JAMS
Jamming as soon as the copy goes into the sorter trays... the sensor that is located in the sorter is dirty this sensor is photo sensor that goes for the top of the sorter to the bottom.

U-3 CODES
Check 2.5 amp fuse on power distribution PCB at upper rear center of copier. Has nothing to do with what the book says is U-3 code problems. Book will have you looking at scanner motor, PCB, and sensors.
LOGIC PROBLEMS
Symptoms: Random and intermittent U-5s and U-1s Refeed soloniod will not fire (clutch is good, sensor is good) Blanking lamps wig out (randomly and intermittently come on leaving some of the copy)
Problem: Ask yourself if you just changed corona wires. If so, did the little green tabs break off. If so, change the corona assy and the problem is fixed. (This one had me going!)