Copier Tip Archives
For more current information, use the Bulletin Boards.
Color Units
Do your reds look orange? Remove two capful's of red developer and add
two capful's of black then calibrate. The red comes out darker.
TEST PATTERNS
Watch your mita test targets. When they are exposed to
light they get darker. It will appear that the copies are to dark. Check the gray band and
color of the paper.
RADF FEED JAMS
The best way to eliminate Feed jams and Multi-feeds, aside from the usual
cleaning proceedures and replacements of feed rollers, is to adjust the
center half moon tire three tread forward of the outer moon tires. This
procedure cuts jamming and multifeed problems 10 fold.
RADF II
Many Mita Dealers have upgraded the primary feed assemblies of the earlier
version RADF I with the new style feed tires. These feed tires are the
individual half moon style that fit on shaft with allen screw. Adjusting the
center half moon roller forward of the outer ones about 2-3 tread lengths
will help keep pressure on stacked originals without making paper feed
harder. This vertually eliminates jamming and multi-feeding even with badly
worn rollers.
Misfeeding Blues
It's been a while since I worked for Mita so I'm not sure of the RADF
model # it may be RADF II. It's the feeder that fits the 4086 and 5685.
Anyway, Mita came out with this neat mod, half moon feed tires and they
suck! Tried moving the middle tire out 5 degrees?
Didn't really work for long you say? Then they came out with those silly
updated separator tires with the break-away shafts, you know the ones
that if you used two rubber sep rollers the feeder multifed, if you used
the mod, 4 rubber tires, it wouldn't feed anything. I found a solution!
Take 2 RADF I separator shafts, remove the tires from one of the shafts
and glue them on the other where the white nylon or second set of rubber
tires will go. Replace the entire separator shaft and throw away that
stupid sectional shaft. The RADF I sep tires are wider and have no
tread, four of them work with VERY LITTLE error. I did this to 40+
machines in my territory and believe me it solved my multifeed/or no
feed problems.
SRDF1
On
the lower separation roller where the spring attaches to the metal, file about 4 mil
of 1 side of each spring off to release the pressure. This is a last resort if
all upgrades don't work. The problem is still too much pressure.
AS-S5120 SORTERS
CRASHING
A couple of sorters in the field have crashed, in some cases breaking the sorter bins
themselves. Rebiulding these sorters in very time consuming and frustrating! Applying
grease to all the guides and frames that the sorter bins slide on seems to fix the
problem. Doing this at set up and at every P.M. done on the copier itself will assist in
eliminating this problem.
Bin crashing or broken parts are often the result of the user removing a stapled stack before the press bar has been released. When this happens the press bar and/or bin drive mech. get out of time. Carefully review the SM for proper way to re-time these two drives and inform keyop about removing stapled copies.
Ai
2310 & Ai 3010
When you are having blank copies, the images are getting shifted, double print, or half
copies.
Remove the laser unit from the machine. Open the unit you will find the polygon
mirror has some type of smudged look to it. Clean all sides of the mirror and your
problem will be gone. You find this problem to be worse were people smoke or in
dusty areas.
LOW - MID VOLUME MODELS
COPY QUALITY
Remove 3-5 capfuls of DV from mid/high volume machines? DON'T DO IT. They do quite a lot
of research as to the amount of developer that goes in a particular model. Although many
different models do use the exact same developer (look for the codes on the bottles, i.e.
N18-T), the amount is what makes them model specific.
MOST MITA MACHINES
PRINT BUTTON BROKEN
Print button broken, if no collator is present swap the button with a collator button.
MEDIUM/ HIGH SPEED
SWITCH PROBLEMS
On high speed machines, double check the transport bed switch, near the base of switch
arm. Paper will actually cut in to this switch, causing a groove and catching or slowing
down the paper. Mylar tape or a Mita 2585 lower metal (old style) exit claw, cut to fit
switch arm, will get you by until a new switch can be ordered.
COPY QUALITY
Remove 3-5 capfuls of developer on your next DV change on any Mita 55cpm or up. You will
notice the quality increase.
CC-50
J01 CODES
new on the mita cc50 front: according to a news bulletin of utax (another company selling
mita machines) a bad contact of the charge corona case and the wire mesh of the drum unit
can cause J01 paper jams.
DC-111
SHUT DOWNS
The off/on cycling caused in the older Mita 111 is due to leaky capacitors
on the power sorce board.
POWER SUPPLY
Machine shutting down repeatedly. Remove Power Source PCB. Check
solder joints on each five connector pins. 0V pin will have crack
around it. Resolder all five with fresh solder.
POWER SUPPLY
Machine powers up and shuts down repeatedly for no reason other than the
power supply goes bad and must be replaced but, check the corona blocks
first as the power supply is very difficult to replace
C1 CODE
If this machine gives you a C1 code after it warms up and it goes away if you turn it off
and let it cool down for awhile, try replacing the thermal fuse. I heard about this from
another tech and I saw it happen about 2 weeks later.
DC-111/112/113
SKEWING
Skewing about 5mm, Check shouldered screws that the clamshell hinges on. They loosen and
drop off the shoulder.
SMASHED CARRIAGE BREAK
Smashed carriage break, clean electro magnetic scanner clutch plates.
DC-111 / 1205
COPY QUALITY
TRAIL EDGE OF COPIES LOOK WASHED OUT LIKE CHARGE/SEP. TROUBLES. HAD EVEN REPLACED HINGE
PINS HV UNITS CORONAS ETC. REPLACED REGISTRATION ROLLER'S AND BUSHINGS AND IT FIXED
PROBLEM.
DC-122
GUIDE ROLLER
When the Guide roller disintegrates (roller between the drum and fuser
path), I usually remove the old tire or wheel and replace it with a
black rubber faucet washer from ACE Hardware Stores. cost is .22 cents
DC-142RE
INTERMITTENT J1/J2
Intermittent J1/J2, these machines are prone to bending if all 4 feet are not on the
cabinet. Open the clamshell look along the back of the machine from the fuser rear, as
they bend along the thin part at the back of the T/S corona. Just bend it back.
DC-152Z
FUSER MELTDOWN
Occasionally the fuser can overheat, melt the picker fingers and warp the
upper fuser roller. This can be caused by the wires from the fuser lamp
shorting to the upper fuser unit. If the clips holding the wires from the
lamp have been turned the wrong way causing the wires to get trapped under
the ribs under the orange cover then the lamp will not go off until C6
occurs.
SKEWING (paper) intermittent J1 / J2
Skewing about 5mm and/or intermittent J1 / J2, check the pins that the clamshell hinges on
(these are pressed into a small plate which can be removed) as these wear. Place the pin
in a good vice & hammer the plates around 180 degrees.
DOUBLE IMAGE
Double image offset about 3mm, check the mirror above the fuser has the silver side
inwards as this is removed everytime the optics are cleaned.
DC-191
COPY QUALITY
Light copies, washed out density. Check the foam seal on the side of the fiber optics
block. This maybe allowing light to enter. Replace if necessary.
DC-213
C3 / C4 CODES
Problem: Intermittent C3 & C4 codes, exposure lamp and thermo switch check out fine.
Scanner Unit electrical cable is faulty. Replace lamp wire assy.
DC-213/313
C5 CODE
Could be the black power relay. You can disassemble the relay and clean the contacts.
313
Went on trip to Central America seen many techs over there using 2 bottleS of DC152
developer. Who would have figured, but it works as long as you use 152 toner.
DC-1200/1400 SERIES
COPY QUALITY
Small Black line going from side to side 3/4 of the way down the page.
Make sure that the S/T corona wires are not loose.
COPY QUALITY
Black copies. Exposure lamp inoperable. There maybe a break in one of the wires on the
ribbon cable that powers the lamp. Check the continuity on each of the wires in the ribbon
cable. Repair if possible or better yet just replace it.
FUSER
Heat roller gear breaks quite often, you may want to keep a few of these on hand if you
have a number of machines. Also, when replacing this heat roller gear, if after
replacement you hear a thumping sound you may have installed the gear backwards. Remove,
rotate and replace.
DC-1205
C3 CODE
You can replace gear 42 A and clean the clutches but in a few short weeks you will be back
for another C-3 CODE if replace the scanner clutch and you won't be back for that problem
for a long time
C-3 CODE
Cleaning just the mag, will not cure your problem. Cleaning off the black paint from each
shaft in the clutch will reduce your c-3 codes. Also check the gear and shaft below the
clutch pak, it could be bent.
C3 Code
After replacing 42 tooth gear, pull both mag clutchec apart. You will find
that the pin for the broken gear is bent. Replace with steel (original is aluminium).
Clean face of mag clutch but when reassembling put one of the thin mylar washers between
the faces. This makes sure that the clutch disengages properly. Gear failure is due to
both clutches trying to drive. Have done this to every C3 problem and never been back to
any of them.
REPLACEMENT ROLLER
Follow through roller that is between the drum and the fuser is no longer made. The rubber
roller deteriorates in time but I have found that a rubber washer from the hardware store
(used for faucets) will work nicely.
DC-1205/1255
C-3 code
Before I replace the broken gear, I always coat the outside of the new gear
with J-B Weld. The added support almost guaranties you won't be back.
PREVENT DRUM
BURN
Disconnect
top two connectors on main on/off switch. This disables the anti-condensation heater and
prevents drum burn on low volume machines.
COPY QUALITY
If your copy has a light, slightly out of focus band about 1/2 inch wide at the rear side,
(and you've made sure it's not your developing unit) try bending upward on the T/S corona
support spring at the rear of the machine. ELECTRICAL
Intermittent power failure. The main switch on this machine is prone to failure. Replace
as necessary.
Blur 2/3 way down page.
Could easily be caused by waste box slightly hesitating reg roller. Lube slider on box
holder.
Copies light on edges
Can be caused by the paper touching the metal part of the T&S corona unit because the
mylar has worn down. Insulate the metal with electrical tape where the paper might
rub it. This will prevent transfer charge from leaking to ground.
1255/1001
C3 SCANNER PROBLEMS
Gear 42 broken, take top off machine, take plate off back (3 screws), remove scanner
clutch assembly, replace gear, clean electromagnetic clutch plates (otherwise it will just
happen again), reassemble.
1256
SMEARED COPIES
If you run into smeared copies on the 1256 and the fixing
section is theproblem see that the oval white plastic spacers on the ends of the press
roller are removed. The manual doesn't mention them at all. The training video says to
remove them. I've had them warp and jam into the end of the press roller causing it to
drag.
1355
OUT OF TONER CODE
If the machine won't add toner, check the toner drive gear, it is to faraway from the
toner hopper. It can be adjusted from the optics area. Look by the black box you will see
a cut-out and you can access the set screw there.
DC-14XX
Had a 1435 with paper jams every time at the same position. To make it short: the hairs of the registration roller cleaner were so long that the paper sensor got stuck at nearly every pass. If you open the machine the sensor fell back into place of course. Now I gave this bristles a haircut and the machine runs like new :-)
DC-1415
COPY QUALITY
Toner spots on copies. You may have a buildup of toner on the shelf between the drum and
DV unit. Vacuum this off. The developer may need to be replaced if machine is very
overtoned. (As is the case with most copiers.)
1415-1435
Thermal fuses keeps blowing
It's because of the double fuses inside the rubber cover, to solve the problem at
installation replace thermal fuse with DC-152 or DC-111 thermal fuse and keep it far from
heat roller, believe me it works.
Erratic
registration
First few copies will be OK, then image slowly moves down paper and getsprogressively
worse. Check foam pad on registration clutch solenoid. The arm will stick to
the pad and paper will keep feeding. Clean off glue and replace pad with packing tape, or
something similar.
DC 1435
THERMAL FUSE
On virtually every new Mita 1435 the thermal fuse blows between 3K to 6K.
Before delivery of any 1435 move the thermal fuse as far away from the heat roller as
possible.
NOISE IN DRIVE TRAIN
Noise in the drive train is usually caused by the white fuser drive gear. Noise starts between 80 and 100K . Part Number
34920240 Gear 22, Fixing Input.
DC-1605/1656
JAMMING
Pre-registration roller jams. Problem maybe caused by improper positioning of the plate
just before the registration roller. Try and adjust this plate closer to the roller.
DC 1656
Get rid of Conveyance fan filter, set fan to full speed ALL the time,
rewire all coronas with mita gold wire, keep to the recommended PM
schedule(30K) absolutely watch out for varience in toner ref on set up
and sim 65 (must be the same or very close)
DOCUMENT FEEDERS
If you find that a mita 1656 document feeder will feed the paper onto
the glass but gets stuck at the white flimsy mylar guide that leads the
paper off of the glass. There is a quick, easy, cheap and permanent
solution. No, it is not to remove the feeder. Take the black mylar
strip that comes with all 20 bin stand-up sorters that attach to the
Mita 55 and 56 cpm machines. Replace the white mylar with the black
mylar and your non-feeding out problems are solved. The Monroe part
number is BH56806330, I assume the mita part number is the same except
for the BH.
DC-1685
DARK STREAKS / BACKGROUND
Pull the blank lamp assy'. The small lamps fit into a cover which can
be carefully removed. Clean the lamps and the inside of the cover. Change
developer if problem returns because the machine is dusting toner. Check the
seal on the developer unit that it is tight against the drum.
DC-1824, THE ZOOMER, MEGA POSTER MAKER, BRUNING 510
JAMMING
Fuser area.
This machine uses a Silocone gel in the oil roll in the fuser. This gel is sticky to the
touch. This machine uses magnetic sensors. This lubricate will contaminate the actuator on
the fuser exit sensor and cause it to stick to the sensor. Symptoms are cardstock will run
but paper will jam especially the first few copies ran.
If anyone encounters one of these machines and runs into trouble you can
E-mail me at consofserv@aol.com I worked on these
machines for five years
and have the manual for them.There are also many 18x24 copiers and laser
printers that wear the Graphic Enterprises badge that I can help you
with."Zoomer,Zoomer Q, Zoomer Q-205,Super Zoomer(found at most
Kinkos),Zoomer 10+,ReproA2D, Pagescan 3&3+,Pro-Setter,and Neg-Setter.The last three
are laser printers and are extremely sensitive and should not be adjusted unless you know
what you are doing.
DC 1855/2155
COPY QUALITY
These machines sometimes produce wrong blanking lamp patterns as well as poor/light C.Q.
Clean the primary and t/s corona reflectors throughly at each and every service call!!!
NOISE
Problem: Squeaking noise from center of machine. Probrably registration clutch.
Solution: Disassemble, clean old grease and relube with suitable lube. This has happened
on virtutally every 1855/2155 that we have sold.
BYPASS JAMS
Form plate downwards slightly to add pressure to mylar fingers on plate. The mylar strip
will push downwards on paper and feed it into the copier better. Has worked everytime for
us when we have customers complaining about bypass jams.
2054 / 2055
COPY QUALITY
Poor copy quality shadows and dusting problem, the mag brush moves with age.
solution on toner cart. side loosen the set screw on the brass collar and move the nap up
about 2mm make test copy repeat if needed this is a trial and error fix
DC-2055
COPY QUALITY
Poor fill in solid black areas is often caused by the transfer sep corrona blasting toner.
Turn it down just a tad.
DC-2055/2085/2254/2255
BLANK COPIES
Blank copies, check blank lamps, try disconnecting them.
DC-2254
C6,C7 Codes.
Check thermal fuse. Replace if necessary.
2285
Erroneous Jams
Lower the shift bias 120V
2355
Jamming
1) Jamming problems due to transport fan pulling the paper too hard into
the transport section: Double up the transport belts. 2) Scanner hums and selects wrong
size of paper: Replace the rear scanner shaft plastic bushing with a brass one and clean
the thick grease from rails and use thin silicone oil.
JAMMING AT REG ROLLER
If the paper stops at the registration roller and the machine keeps running, and it won't
continue, clear or show jam, unplug the sorter and plug it back in. This resets the
sorter.
SCANNER PROBLEM
If the scanner tries to and doesn't move out of home position when you put paper on the
glass, and the machine says check paper size. check the large white drive gear next to the
optics motor (behind inner front cover) the set screw is loose. Remove the motor to gain
better access to the allen set screw.
LIGHT COPIES
This model needs constant transfer corona wire replacement. If copies light, and
weak half-tones, replace, don't clean wires (it will last until you get down the street).
Not unusual to replace wires and clean shields a couple of times between drum
replacements. If drum not making it to normal life, (copies usually get dark), try using
electrical tape on very ends of charge corona grid that faces drum. Helps!
On models with toner problems (units with constant add toner message) make sure that you have the latest toner sensor with red dot. When installing, first push down on the hole in the aluminum plate. This plate tends to warp with use and heat. Push it down to put it back closer to developer flow.
UNEVEN COPY DENSITY
Check erase lamps as this will cause poor copies and your machine will use more toner.
DOUBLE FEEDING
Double feeding from the paper trays usually results in the separation
roller getting replaced with little improvement. As these machines age, the paper pick up
clutches start to grab too much. Replace the clutch and several paper-feed calls will be
prevented.
2556/3055 Double Feeding.
Double
feeding from the paper trays usually results in the separation roller getting replaced
with little improvement. As these machines age, the paper pick up clutches start to
grab too much. Replace the clutch and several paper feed calls will be prevented.
DC-3055
WASTE TONER
I have used the waste toner in this machine in a pinch with no ill affects so far
TONER YIELD PROBLEM
The Mita 3055 is known for haveing Toner Yields of 300-1500 copies. Mita recently
confirmed their need to revamp the 3055 toner. Even with their new batch of toner, there
has still been yielding prolems. It has been proven that discarding one cap full of
Developer increased the Toner Yield to an average of 8500 copies, and eliminated toner
dusting in machine without compromising black fill.
FALSE TONER EMPTY
Solution: Remove the DV unit. Remove silver toner shield. Be sure that the toner sensor
has a red dot (sticker) on it. If it is green you need to order the revision of this
sensor. If it has a red dot, replace Developer, Run SIM 60, Check SIM 62 data. (factory
set at 83) If the data is not betwen 80 & 90, Remove DV section, Peel back the red
sticker and adjust the VR until you get a reading of 80 - 90. This may take a few trys and
the VR is VERY sensitive. Run a SIM 60, then check SIM 62 data to be sure it is correct.
3060
IF WHEN TURNING MACHINE ON YOU GET A BRIEF LIGHTING OF THE CONTROL PANEL THEN THE POWER RELAY KICKS OUT, BEFORE SWITCHING THE POWER SUPPLY 3 TIMES...CHECK THE SERVICE LOG TO SEE IF FEED TIRES WERE CHANGED RECENTLY IN THE CASSETTE AREA IF SO CHECK FOR PF CLUTCH WIRES SHORTED TO GROUND..I FOUND THIS AFTER 2 DAYS AND 9 HOURS WHEN UNITS WERE SLID IN THE PF CLUTCH WIRES GOT TORN OUT OF PLACE AND GOT PINCHED
3060/4090
FUSING UPDATE
There is now an update for the lower separation pawls in the fixing unit. This is
the second update which replaces the thin metal pawls with new separation claws, guide
plate and films. The new separation claws are mounted with springs allowing the claw
to move away from the press roller during fixing jams, preventing the claw from damaging
the press roller. Installing the other two updates and EPROMS has helped to lengthen
the days between service calls!
FUSER
On the 3060 and 4090 models there have been several changes to the fuser unit. one problem
that I have found is that the lower fuser pawls tend to get caught by the pressure roller
and bend them down causing deep cuts in the roller. Best method is to remove them. These
pawls are not necessary for proper operation.
DUSTING PROBLEMS
While nothing ends dusting completely you can reduce it , first vaccum the exess
toner in the toner auger tube going from the toner hopper to the developing unit, change
the developer run simulation 60 to set the toner reference values, once sim 60 is
done, enter sim 62 and change the time setting from 0 to 11 this will reduce the amount of
toner normally added with new developer, as this machine will compensate toner
regulation over time and other factors, have tried this on many machines and it greatly
reduces the dusting problem.
DC-3085
On all Mita machine that use these plastic corona pins, I
have been putting a drop of grease on the pin before installing them. This makes them easy
to remove without breaking off, even when yellowed.
DC-3585/ DC-4585
EXHAUST FAN
To get exhaust fan by fuser assembly to run at high speed all the time elinimate the
little resistor on back of machine next to main board. Cut wires to resistor join and
insulate...
DC-3648
C51 Codes
C51 codes are caused by excessive load on transfer or detack. Due to the length of these
corona wires the wires tend to loop or swing causing them to arc to the frame causing a
C51. Placing a piece of mylar, trimmed into a V at the top, under the middle of the
transfer wire. This will help support it and will prevent it from swinging.
40 SERIES
LIGHT COPIES
Light CQ on 40 series machines? Although they were the last of their generation
of density based sensors, there were some improvements. One was a modification that placed
a mylar wiper on the upper auger that would assist DV flow over the sensor. Along with
this mod, you needed to clean the sensor surface (take it out, it's only two screws) to
remove the solidified toner.
DC 4056 / 4086
LIGHT COPIES
This was actually on a Gestetner 2440. From brand new, a copy with good density was only
produced after severly overtoning (which of course caused dusting all over). No way to
adjust doctor blade & adjusting mag pole position improved density but hopelessly
messed up the toner sensor. DV unit was defective right out of the box causing light &
uneven toner density. New unit cured problem instantly.
DC4085
BREAKING GEARS
If you get the two gears breaking that are commonly know as the "clamshell
gears". Your problem is not the gears themselves or the clutches binding up. It took
me 3 visits to a machine that broke these 2 gears about every 3 weeks before I finally
found what it was. You can find out very easily by removing belt pressure from the gear
that drives the transport belt assembly. Try turning this gear by hand, if you find it is
tight, there is your problem. Because this machine is known as a "duster", it
drops toner everywhere including the transport unit. The toner gets into the white rollers
that turn the transport belts. Not the rollers towards the fuser section but the ones
closest to the transfer/separation assembly. Those rollers are on a gold shaft that has a
cog in it. Just pull the roller assy out through the machine, take off the c-clip and
remove the white cogs/rollers clean their insides as well as the gold rod that they ride
on. Usually you will find a hard crust of toner built up on them causing drag on the
transport drive gear which subsequently causes drag on the clamshell gears causing those
gears to break. Clean them approx every 80,000 copies and you won't be replacing any more
gears and you WILL get rid of those pesky C2 codes.
NOISE
Chatter when using the duplexer.There may also be jamming. The duplex feeder clutches in
the rear of the machine, (as well as the other clutches in the machine), wear and need to
be replaced. You can try cleaning them first, but I would reccomend just replacing them if
you can.
NOISE
4085 noise on duplex? There was a tech bulletin that recommended a shim between the magnet
and friction plate, as well as cleaning the clutches. You will find this shim much less
expensive and time consuming than replacing the clutches.
COPY QUALITY
This machine is very sensitive to minor deviations in the DV Calibration. If you are
getting light or grainy copies soon after replacing the developer, try re-calibrating the
developer.
COPY QUALITY
With a known good developer tank (ie. developer bearings not leaking).
First level machine front to rear. Add developer until the toner light flickers at 50%
than add 1 mounded CAPFUL of developer only. This is less then the recommended scoupe.
Adding more only undertones the system and causes premature breakdown of the carrier
coating reducing its ability to hold on to the toner.
COPY QUALITY
DO NOT LEVEL THIS MACHINE, if you notice the toner sensor sits towards the front of the
dev. unit. You must un-level this machine for proper dev. flow. (about a 1/2 inch higher
in the rear) I had 18 MITA DC-4085's in one of my school dist, running 40,000-60,000
copies per month. I had to find the problem
real fast. My CBC'S went from 5k to 6k copies to a high of 25,000 copies. This machine
must also have all of its updates to run efficiently.
DC 4086
TONER DUSTING
To help cut down on Toner Dusting on 4086, Elongate the screw holes on upper
cleaning unit cover to allow you to adjust the cover as close to drum as
possible, but leave a little room for air circulation around drum.
DC5055
BLANK DISPLAY / MACHINE INOPERATIVE
Check the regulator board above the fuser for bad solder joints. The fuser heats up the
board and may also blow the 7 volt regulator by overheating it. If this is the case,
de-solder this component and replace it with a new one. You can get this at any
electronics supply store.
55 SERIES
PRE-TRANSFER LAMP
Failing pre-transfer lamps on 55 series? The lamps themselves rarely fail. Cleaning them
is a good idea, as well as the driver board on the back of the cleaning section. A toner
buildup on the back of the board (remember, toner is conductive) can cause all sorts of
trouble. The boards themselves usually fail before the lamp.
DC5585
COPY QUALITY
Poor transfer. Check that the pre transfer lamp is clean. It is located under the drum
near DV unit.
Duplex Jams/Disappearing Copies
Clean the duplex refeed clutch. The refeed clutch in the duplex will get dirty and cause
the feed shaft to pull paper behind it, lodging it behind the duplex vertical transport
and the LCT.
DC-3585/4585
JAMMING
Check ozone filter on rear of copier. This maybe clogged and may prevent the flow of air
through the transport belts by the suction fan.
DC-5585/7085
Light copies from premature developer failure
The developer tank has two small square slots held on by a small screw,
there are sponges in them, if they get clogged the developer unit
suffocates and causes the dv unit to buildup moisture thus breaking down
the triboelectric charge. This is especially true in high humidity
areas, like Florida; home of the gigantic palmetto bugs.
COPY QUALITY
Transfer. Maybe caused by inoperative or dirty pretransfer lamp. Lamp is found between the
drum and the DV unit, you have to remove the drum to clean it, but if it is dirty and you
clean it, it may help it quite a bit. These lamps are also known to go bad and may need to
be replaced.
DC-5685/90 AND 7085/90
DASH MARKS ON DRUM
When getting dash marks on the drum, check the single pin that the cleaning unit brush
connects to on the pcb. They might have broken loose from the board and not making a
connect. Another clue is the cleaning brush is packed with toner. Resolder or replace
board.
6090
C570: Drum potential sensor is dirty or needs replacing.. Mita will warranty this item, so return it. Make sure all optics are clean. Also, replace the upper developer seal. For a $120.00 it will eliminate alot of headaches. Also, Mita has a tech bulletin on this.
6090/6590 Gray Background
Grey background but black fill is normal (not over-toned). A quick check is to
unplug the PTC corona and see if background clears. If so, replace PTC blocks and
wire. Have seen this in both the 6090 and 6590.
6590/6595/8090/8095
BACKGROUND ON COPIES. CAUSED BY DEVELOPER FAILURE. REPLACEMENT
HAS BEEN CHANGED TO 150,OOO FROM 300,000
9285
A PROBLEM OCCURED ON A 92 SERIES . THE SUCTION FAN ON THE DUPLEX
WAS TURNING ON AND OFF DURING A COPY. THE FAULT WAS FIRST THOUGHT TO BE THE MOTHER BOARD
SENDING THE SIGNAL TO THE MOTOR. A FIXED VOLTAGE WAS ALWAYS PRESENT, RELYING ON THE
SIG FROM MPCB TO TURN IT ON. AFTER ESTABLISHING A SIGNAL WAS ALWAYS PRESENT, WE RULED OUT
THE MPCB. NOW THE POWER SUPPLY WAS SUSPECT BUT AFTER A TEST, WE REALIZED A VOLTAGE
WAS ALWAYS PRESENT WITHOUT DROPPING. THE MAIN POWER RELAY WAS TAKEN OUT AND
EXAMINED, FINDING ARCED OUT CONTACTS. AFTER FILING THE CONTACTS THE PROBLEM WAS
FIXED
ADF1
DOCUMENT FEED
Plan on replacing the feed rollers as well as the feedback rollers at least every 200K.
You can only use Fedron for so long.
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