Gestetner G060 Service Manual page 196

PRINTER ENGINE SERVICE MODE
3
(Class 1, 2, and 3)
920 4 Mode Set
5 Forced
6 Auto Tnr Ref
(Auto Toner Refresh)
[Forced Tnr Ref] Forced Toner Refresh
921
Perform forced toner refresh mode.
When the developer has deteriorated or when prints are made in a very low humidity
condition, dirty background may appear continuously.
When this kind of dirty background appears, check whether or not the development
gamma is within the target (SP3-120 and 121). If the development gamma is not within the
target, do this SP mode.
The machine automatically does the toner refresh mode in the following sequence.
1. Consumes toner in the development unit without toner supply until toner end is
detected
2. Starts toner recovery mode.
3. Starts process control self-check.
NOTE: If toner is drastically consumed for a short time, this may cause carrier to flow out.
To prevent this, toner is consumed over a long period of time. (It takes about 20 minutes to
complete this toner refresh mode).
1 [K]
2 All Color
G060
Mode No.
Function / [ Setting ]
* Enables/disables refresh mode.
[ 0 to 2 / 2 / 1/step ] Alphanumeric
0: Disabled
1: Done at power on and toner end recovery
2: Done at power on, toner end recovery, and
after the specified number of prints.
NOTE: Refresh mode is done during the toner
end recovery self-check after a new toner
cartridge is installed.
Executes a forced refresh mode.
Use this mode when the image is smeared. It
takes about 1 minute.
Also use after replacing the components of the
transfer unit (see section 3).
Performs a toner refresh during the OPC refresh
mode by changing the development bias from 50V
to 400V.
[ 0 or 1 / 0 / - ]
0: Disabled
1: Enabled
Enable this SP mode when dirty background
and/or firefly spots appear intermittently on prints
with a low image area ratio.
While making prints with a low image area ratio,
developer is agitated with less toner supplied. This
may cause the toner-carrier attraction force to
increase or toner to coagulate.
This sometimes causes firefly spots or dirty
background when a large amount of toner is
supplied.
NOTE: When enabling this SP mode, the following
SP modes should be changed.
SP3-906-001 Job End Process Control Self-check
200 (Default) -> 100
SP3-920-003 OPC Refresh Mode / Prints
200 (Default) -> 100
5-28 SM