Process Control; Overview - Ricoh TH-C1b Service Manual

PROCESS CONTROL

6.4 PROCESS CONTROL

6.4.1 OVERVIEW

The copier adjusts the following process control parameters:
• Development bias (V
• Charge corona grid voltage (V
These 2 parameters maintain a consistent gamma for the engine.
NOTE: This copier uses only the ID sensor. (There is no TD or potential sensor.)
6.4.2 PROCESS CONTROL STEPS
Six Steps
Depending on the machine's condition, some or all of the following steps may
occur:
➀ : ID sensor calibration
➁
: Color development bias initialization (M, then C, then Y)
➂
: K development bias initialization
➃
: M, C, Y, and K bias fine adjustment
➄ : Charge grid bias voltage adjustment
➅
: Process control interval counter reset
If the main power is turned off (or the cover opened) during a process control
session, the session is aborted. Turning the power on (or closing the cover)
restarts the process control session.
When is Process Control Done?
When an event arises, the specified steps are performed.
Event
Forced process
control
Process control
regular interval
Power on
Environmental
change
)
B
When forced process control is done (engine SP mode
3-001-1)
End of job: When more than 200 sheets have been
printed upon completion of a job. (The interval can be
changed with engine SP3-003-1.) Black-and-white
outputs are not included in this count.
During a job: If the number of prints since process
control gets to 700, printing stops and process control is
done. The interval can be changed with engine SP 3-
003-1 [default: 200] and engine SP 3-003-2 [default:
500]. Change only SP 3-003-2 if you do not wish to
change the "end-of-job" interval.
When the fusing pressure roller temperature is 60
lower immediately after the power is turned on.
When the change in the temperature/humidity sensor
output since the previous process control exceeds a
certain value. SP3-004 can be used to change the
threshold temperature and humidity values.
)
G
Condition
6-16
10 February 2005
Steps
➀ ➅
→
➀ ➃ ➄ ➅
, , ,
°
C or ➀ ➃ ➄ ➅
, , ,
➀ ➃ ➄ ➅
, , ,