2045 e sc 990

[Rick]

This machine was working perfectly for a long time then suddenly its giving me sc 990 . It says its a software problem in the manual but wher do I
go from there ?

[halac0ax]

Replace the Hard Drive. I've also had one machine where it was the drum that needed replaced. Don't ask me why but that is what took care of it.

[Jonesy-5150]

Replace the Hard Drive. I've also had one machine where it was the drum that needed replaced. Don't ask me why but that is what took care of it.

He's dead on. I was shocked to learn that doing a full PM can fix SC990 codes.
Outside of that, you roll the dice on HDD or controller. Probably wouldn't hurt to flah the firmware as well.
Good luck!!

[Fearless V K]

Just do the drum and developer if it is time for that. Ask anyone who works on these all the time (like me). The drums don't go past 150K. If you get one that does. It's an anomaly. The 990 pops after the copy job usually, that's when the ID patch is developed on the drum for process control purposes.

[imaginemoko]

agree.. i was also suprised about it, just the drum and developer complete set in a full PM...

[lvsb]

He's dead on. I was shocked to learn that doing a full PM can fix SC990 codes.
Outside of that, you roll the dice on HDD or controller. Probably wouldn't hurt to flah the firmware as well.
Good luck!!

doing a full PM is half correct, check the laser power SP 2103(i think) if the values are near the max range then the right door switches are breaking down under load and effecting laser power which in turn effects the ID sensor readings. usually you get sc 990 procon.c in the SC code history

SC990 The following data is
stored in the SC error log:
File:

procon.c

Line: 8xxx (ex. 8573)
Value: 0

NOTE:

In many such
cases, SP2103-1 to -4
have been set to a value
near the maximum (+64).
A normal Grayscale pattern
was not detected 15 times
consecutively during the ID
sensor Grayscale pattern
check.
1. Clean the ID sensor and/or
drum.
2. Replace the following, as
deemed necessary:

��

OPC drum

��

Developer

��

Cleaning blade

��

Charge roller

��

Charge roller cleaning
roller

��

LD unit

3.

If any of the above actions
resolved the SC, perform all
of the following:
1- Execute SP3001-2 (ID
Sensor Initial Setting).
2- Return SP2001-1 (Charge
Roller Bias Adjustment) to
its default value.
3- Return SP2103-1 to -4
(LD Power Adjustment) to
their default values.

4.

Upper right cover switches.

[tcs04]

doing a full PM is half correct, check the laser power SP 2103(i think) if the values are near the max range then the right door switches are breaking down under load and effecting laser power which in turn effects the ID sensor readings. usually you get sc 990 procon.c in the SC code history

SC990 The following data is
stored in the SC error log:

File:

procon.c

Line: 8xxx (ex. 8573)
Value: 0
NOTE:

In many such

cases, SP2103-1 to -4
have been set to a value
near the maximum (+64).
A normal Grayscale pattern
was not detected 15 times
consecutively during the ID
sensor Grayscale pattern
check.
1. Clean the ID sensor and/or
drum.
2. Replace the following, as
deemed necessary:

��

OPC drum

��

Developer

��

Cleaning blade

��

Charge roller

��

Charge roller cleaning

roller

��

LD unit

3.

If any of the above actions

resolved the SC, perform all
of the following:
1- Execute SP3001-2 (ID
Sensor Initial Setting).
2- Return SP2001-1 (Charge
Roller Bias Adjustment) to
its default value.
3- Return SP2103-1 to -4
(LD Power Adjustment) to
their default values.

4.

Upper right cover switches.

I agree, this code seems to occur when the laser power settings are "maxed out". I believe it can also be caused by a poor seal between the PCU and dev unit allowing toner to puff onto the laser diodes which require increased power to compensate. I would advise that in addition to the above, you replace the seal (AA151352) between the PCU and Dev unit and lock the two units together with a self tapping screw through the tag at the front left edge of the PCU /Dev unit.