Sc 990 - Ricoh Aficio 450 Copier

SC 990 is software performance error. This means The software attempted to perform an unexpected operation.
Possible causes:
1. Software defective
2.Internal parameter incorrect
3.Insufficient working memory
4.When SC occurs, the file name, address and data will be stored in NV RAM this information can be checked by using SP 7403. Note the above data and situation in which this SC occurs. Then report the data and conditions to your technical control center.

SC 990 means that the hard drive for the finisher is not working correctly. You will need to replace the hard drive on the rear of the copier > it is used when the finisher is being used. I had one that always showed up even after replacing the HD > I finally, took the finisher off and that was the end of it.... It is time for a new copier..... Good Luck

[Cause]

Dirty contacts on Upper Right Cover Safety Switches. Toner gets inside the Upper Right Cover Safety Switches, which can lead to lower DC voltage being applied to the Laser Diode. Which leads to:

SC 990 eng_procon.c (when a normal Grayscale pattern was not detected 15 times consecutively during ID Sensor Grayscale pattern check) check with SP 7403 Service Code History look for Detail in history of SC 990.

LD Power not being strong enough to be read by Laser Synchronizing Detector causing a SC 322 or 326 depending upon timing.

5vdc not being fully applied to connector 403 pin 3 on the Laser Diode PCB causing an Open Cover Indication, or 24vdc not being applied fully to connector 107 pin 2 on the PSU PCB causing an Open Cover Indication.

Circuit Explanation: 5vdc (VCCD)is output from connector 403 pin1 of the Laser Diode PCB where it travels through 2 of the Upper Right Cover switches than through 2 of the Front Cover Safety switches before being applied to connector 403 pin 3 of the Laser Diode PCB where it is now used to power the Laser Diode. Lower voltage on pin 3 leads to lower laser diode output which causes the machine to raise LD Power (SP 2-103) when maximum values are reached, laser diode output can not be increased further which can lead to SC 322, SC 326 and/ or SC 990 eng_procon .c. If the voltage drops too low an open door indication is sent to the BICU PCB but a signal is not sent to the IOB PCB which tells the machine which door is open.

Note: An older Drum more than 150,000 copies can also lead to SC 990 by causing incorrect ID Sensor readings

[Resolution]

1. Clean the internal contacts or replace Right Door Safety Switches (2 of Part Number 1204 2521 and 1 of Part Number 1204 2529)

Clean and vacuum the PCU.
Clean the Toner Shield Glass, Charge Roller and ID Sensor.
Check Service history for Drum Life, if over 150,000 replace Drum (Part Number A230 9510)
Reset SP 2103 -1 thru 4 to defaults.(LD Power Adjustments)
Reset SP 2001-1 to its default. (Charge Roller Bias Adjustment)
Execute SP 3001- 2 (ID Sensor Initial Setting)

990 B Software performance error
The software attempted to perform an
unexpected operation.
• Software defective
• Internal parameter incorrect
• Insufficient working memory
• When this SC occurs, the file name,
address, and data will be stored in
NVRAM. This information can be
checked by using SP7-403. Note the
above data and the situation in which
this SC occurs. Then report the data
and conditions to your technical
control center.

It is a firmware issue u need to upgrade firmware on the copier
ull need a service engineer to do that

many causes can do sc 990
which are :
soft ware problems .
hard disk problems or bad connection
printing interface problem .
so you can
first :
make shore that the printing interface is connected correctly
tray to replace the hard disk
tray to set up new soft ware useing flash card.
if it is still do
e mail me on :
[email protected]

replace drum, drum cleaning blade,charge roller. this will sort Sc 990

The PL-990, having its own internal PHONO Preamp/EQ, will operate with any audio gear that has a standard Line Level stereo input (aux, cd. tape, etc).

Error code 990 indicates software problems yuo can check in SP7-403 for information.
Error code 540 will proberly indicate some heating trouble in the fix, you have to reset the machine with service code SP5-810.
Code 350 will disappear if you restart the copier.

SC 990 is a software performance error.The software attemted to perform an unexpected operation.Software defective,internal parameter inncorrect or insufucient working memory.SC 990 occues when printing a message dtored in the information box.Avoid by firmware upgrade.This information can be cheked by using SP 7-403.The hard unit is located in rear right side up position of by pass.The developer is under toner botle in developer unit.