Ok, the machine came up with funny colors, while trying to trouble-shoot, a c021 code came up. tech sent me a chart to troubleshoot the c021, basically taking all gears apart and greasing and reassemble. did that, now i have no yellow. tech support says with the lgc or the img pwbs.

anyone encounter this yet?

maybe CS-552ci?

We've had a couple of our techs running into this same type issue on the 550's.

So far I've been out of the loop on these and plan to stay that way. They have spent several hours doing service calls on these things.

I'll ask when they get in this morning.

Does your yellow dev unit spin by hand?

Darry - wish i could..lol

Mark B - yeah, all the dv units spin freely. and the dv motors turn when the machine fires up.

a little c4 should fix it tho

ok, new gears and a new logic board today. still no yellow.

guess i'm still chasing rabbits!

BTW our tech said he ended up redeveloping the yellow unit.

I had some weird codes on a 750, turned out to be a fuse on the power supply. The kyoshiba has a ton of fuses on the ps pcb. Just a thought.

there is a toshiba fix for this. i can email you it.

Can you just copy and paste it here
I have the same issue

quote:

Originally posted by FOUST:
there is a toshiba fix for this. i can email you it.

emailing it would be better.



Overview
Due to possible contamination in the developer drive unit, intermittent C021 errors may occur.
Detail
Intermittent C021 errors may occur on the e-STUDIO6530c series machines as a result of
contamination in the developer drive system.
Since it is possible that C021 errors can be caused by other issues, it is recommended to first
check the items discussed in TechNet article titled “C021, C022, C023, and C024 Error Codes
and Developer Over Filling” dated 4/14/2010 before you begin this procedure.
If C021 errors continue to occur, please use the following procedure to clean and lubricate the
developer drive unit in order to reduce the occurrence of C021 errors.
Check Procedures of Developer Drive Unit
1) Remove the developer drive unit from the equipment.
Refer to Chapter 11.5.36 in the Service Manual.
2) Remove the developer unit motors (K and YMC) and the developer unit mixer motors (K and
YMC). (8 Screws)
Note:
Be sure to mark the location of each motor since they are not all the same and must be put back
in their proper location.
Copier Bulletin: TSB-1028
Date: 09/13/2010
Page: 1 of 8
Models: e-STUDIO6530c Series
Subject: Intermittent C021 Errors
3) Remove the developer unit motor-K and the developer unit mixer motor-K support bracket (3
Screws)
4) Remove the developer unit motor-YMC and the developer unit mixer motor-YMC support
bracket. (8 Screws)
5) Remove the gears as shown in the figure below. Thoroughly clean the shafts indicated by the
red circles then clean the inside diameter of the gears. Be sure to remove any contamination
from the shafts and inside of gears. (See example)
Place these gears off to the side after they are cleaned so that they will not get mixed up with the
gears that will be removed in future steps. Do not reassemble at this time.
Example: Contamination on the shafts and on the inside diameter of the gear
6) Turn the drive assembly over to view the side with the couplers on it.
7) Remove the metal plate installed. (8 Screws)
8) Remove the 6 gears shown in the figure below.
9) Following the disassembly instructions below, remove the couplings and the gears shown
here.
How to disassemble the couplers
10) Thoroughly clean all shafts on this side of the drive unit. Then clean the inside diameter of
the gears and couplers. Be sure to remove any contamination that adheres to the shaft and the
inside surface of the gears.
11) Apply (6LE36904000 Molykote EM-30L_100) white grease (the size of a rice grain) onto the
shafts indicated by 4 red circles in the figure below and reassemble the coupler assemblies. Use
the guidelines below for proper location of grease application and coupler reassembly procedure.
(5) Remove the E-ring
then the white gear.
(6) Remove the E-ring
then the black gear.
(1) Push the coupling gear. (2) Remove the stop ring. (3) Hold the base of the gear.
(4) Push down and rotate
counterclockwise to remove the
coupling assembly
(1) Apply the grease
(size: a rice grain) to the
places indicated in the
figure below
(3) Apply grease to
the places indicated
in the figure below.
(4) Install the white
gear and secure it with
the E-ring.
(5) Insert the
springs.
(2) Reassemble the
gears and secure them
by the E-rings.
(6) Apply the grease
to the places indicated
in the figure below.
(7) Insert the
couplings and secure
them with the stopper
rings.
12) Apply a small amount of the grease (the size of a rice grain) onto the shafts indicated by 6
red circles in the figure below. Then reassemble the gears into them.
Note:
Be sure not to damage the tooth surface of the gears.
13) Apply a small amount of the grease (the size of a rice grain) onto the tooth face of the
reassembled gears.
Location where the grease is applied
When properly assembled a small (1.5
mm to 2 mm) gap should be visible
between the coupler and the stop ring.
If no gap (as seen in the
example on the left), or a very
large gap (11.5 mm to 12 mm
(as seen in the example on
the right) occurs, the coupler
is not properly seated. To
correct either condition, push
down on the coupler and
rotate it clockwise while
holding the bottom gear.
OK
NG NG
14) Clean the shafts on the metal plate (in the figure below), then reinstall the assembly to the
developer drive unit. (8 Screws)
Note:
Be sure not to apply the force to the shafts.
15) Turn the drive unit over once again to reveal the motor drive side of the unit.
16) Apply a small amount of the grease (the size of a rice grain) onto the shafts that are
indicated by the red circles in the figure below. (See reference below for proper placement of
grease) After applying the grease, reassemble the gears.
a
"A" Apply grease to
4 places indicated
in the figure below.
"B" Apply the grease
to 4 places indicated
in the figure below.
"C" Apply the grease
to 2 places indicated
in the figure below.
"D" Apply the grease
to 4 places indicated
in the figure below.
A A A
B
A
B B B
C C
D D
17) Apply a small amount of the grease (the size of a rice grain) onto the side surface of the boss
of the gears indicated by the arrows in the figure below.
18) Apply a small amount of grease (the size of a rice grain) onto the tooth surface of the 12
gears.
19) Reinstall the brackets that were removed in steps 3
and 4.
20) Install the developer unit motors (K and YMC) and the developer unit mixer motors (K and
YMC). (8 Screws)
21) Reinstall the developer drive unit into the equipment.
Note:
Be sure not to hit the couplings when installing the developer drive unit.
22) Install the drum drive unit in the equipment.
End.
Example of the
size and the
location where
grease is applied

Hi Foust. I work for a Kyocera dealer in Minnesota. I inherited Kyocera 550c. For the past 2 years, no service issues. Now, intermittent c021 code. In your suggestions, you reference to figures with pictures how to rebuild dev drive assembly. I am not trained on this machine, so it is very painful to service this copier. Are you able to email for me additional photos and fixes for this code? My email address is gregoryt4@gmail.com Thank you again.