Ricoh Aficio MP 2550B, Service Manual

Page: 291 / 1153

SP2xxx: Drum
SM 5-27 D017/D018/D019/D020
Service
Ta
bles
Adjusts the current applied to the transfer roller during copying from the
duplex unit when the user uses the “Normal” paper setting.
Use this SP when the image on the rear side of the paper has a problem
caused by poor image transfer.
[0 = –2
μ
A / 1 = 0
μ
A / 2 = +2
μ
A / 3 = +4
μ
A]
Cleaning
4*
Adjusts the current applied to the transfer roller during roller cleaning.
If toner remains on the roller after cleaning (dirty background appears on the
rear side of the paper), increase the current.
[–10 to 0 / –4 / 1
μ
A /step]
5 Input – Front DFU
6 Input – Rear DFU
Temp Inside the Machine
7
Displays the temperature measured inside the machine just after power-on
(by the thermistor on the SBCU board) the last time that the fusing unit was
less than 40°C just after the machine was switched on.
The transfer current is corrected in accordance with this value.
Developer Initialization
2801
Initializes the developer and resets the TD and ID sensor outputs to their
defaults. Do this SP after you fill the PCU with developer at machine
installation and every time developer is replaced.
Developer Mixing
2802
Mixes the developer and checks Vt. The machine mixes the developer for 2
minutes and while doing this, it reads the TD sensor output (Vt). It does not
initialize the TD sensor output.
If the machine has not been used for a long time, prints may have a dirty
background. In this case, use this SP mode to mix the developer.