Sc Codes Group 3: Image Development - 1 - Toshiba e-STUDIO4500c Service Manual

April, 2007

SC codes Group 3: Image Development - 1

SC300 D AC charge output error 1: K
SC301 D AC charge output error 2: M
SC302 D AC charge output error 3: C
SC303 D AC charge output error 4: Y
An interrupt checks the status of
the power pack every 2 ms. This
SC is issued if the BICU detects
a short in the AC charge for
black, magenta, cyan, or yellow
(V = 0, for example) for 500 ms
(250 times).
1. Disconnect the high voltage cable from Terminal C of the multiple high-
2. Attach a voltmeter to the terminal.
3. If there is no output from the terminal, replace the high voltage power
4. Test the conductivity between the OPC unit and the ground. If there is no
5. If there is no charge PWM signal, replace the harness and/or BICU.
SC312 D Charge, development error 1: K
SC313 D Charge, development error 2: M
SC314 D Charge, development error 3: C
SC315 D Charge, development error 4: Y
500 ms after the black, magenta, cyan, and
yellow drums start to rotate, the machine
starts to monitor the AC current feedback at
8 ms intervals. This is SC is issued if the
feedback for the charge unit of any color
drops below 0.5V for 400 ms (50
consecutive readings).
SC316 D
SC317 D
SC318 D
SC319 D
voltage supply board.
supply.
-or-
If there is output from the terminal, test the resistance between the high
voltage cable and the ground. If resistance is nearly "0", check the high-
voltage harness for defects and replace it if necessary.
conductivity between the OPC unit and ground, replace the OPC unit.
AC bias charge adjustment error 1: K
AC bias charge adjustment error 2: M
AC bias charge adjustment error 3: C
AC bias charge adjustment error 4: Y
An average value of 8 ms/cycle could
not be attained for Vpp (AC charge
bias) within 15 attempts.
-or-
The output of the AC charge boosted
Vpp over 2.8 kV.
SERVICE CALL CONDITIONS
High voltage power supply
BICU defective
OPC unit defective
4-37
Make sure that the settings
of SP2202 are at the
defaults.
Defective charge roller
Defective power pack
Charge roller dirty
Charge roller defective
Bias terminal connection at
the PCU receptacle is dirty or
defective