Xerox DocuColor 12/DCCS50

1/05
10-111
DocuColor 12/DCCS50
Photoreceptor Drum
Principles of Operation
Reissue
Figure 2 Photoreceptor Drum CRU
The Drum Motor assembly includes an encoder that
provides pulses at the rate of once per
revolution. The IOT CPU PWBA uses these pulses to accurately time many of the copier func-
tions.
The Drum Motor rpm speed varies, depending upon what type of copy job is being processed.
T
able 1 show
the relationship between paper transport speed and Drum Motor speed.
The IOT CPU PWBA and IOT Drive PWBA control the Drum Motor. This PWBA contains the
electronics that drive the Drum Motor and converts the encoder pulses into the Machine Clock.
Motor Control is described in detail in the Start Power section.
Drum Data
The Photoreceptor Drum has a PWBA that contains Drum data and that provides information
that is used by various machine control functions. The data that is stored on the Drum PWBA
is:
•Drum Type
• Drum serial number
• Drum usable cycles number
• Drum Initial installation date
• Drum final installation date
• Drum installation frequency
• Dispense Motor usable time
• Charge Corotron discharge time
• Preclean Charge Corotron discharge time
• B/W and Color copy counters
When a new Photoreceptor Drum (a CRU) is insert
ed into
the machine, the new Drum serial
number is read and compared to the serial number stored in the NVM of the machine. When
the machine senses a different serial number, it interprets that a new Photoreceptor Drum has
been installed. The following occurs when a new Drum is installed:
• The Drum “Initial installation date” is stored when the machine detects the “Drum Installa-
tion Frequency” is read as “0”
• The Drum “Installation Frequency”, “Serial Number”,
“Final I
nstallation Date” and other
Drum data is read and then stored on NVM of the machine.
• The previous Drum data in NVM is st
ored as back-up data.
• Detection of the Drum “Replacement Time” is implement
ed after the Drum data is stored
and determined usable. When this is done, then any fail status related to the Drum CRU is
cancelled.
The various Drum run times and cycles from the Drum PWBA are stored and counted. Drum
replacem
ent t
ime is detected by the value of “Drum Usable Cycles Number” and “Dispense
Motor Usable Time.” The following error codes are related to the Drum CRU:
• 09-410: Drum CRU Change Soon - when the values of the above cycle numbers and time
reach
a f
ixed value.
• 09-378: Drum CRU Change - when the values of the above cy
cle numbers and time are
zero (0).
• 09-372: Drum Not In Position - when the machine can not
detect the Photoreceptor Drum.
• 09-311: Drum Type Mismatch - when the machine detects the incorrect type of Photore-
ceptor Drum.
•
Table 1 Photoreceptor Speeds
Transport Speed
(mm/sec)
Motor Speed
(rpm)
Normal Copy 219.47 1996.0
Heavy weight 129.68 1179.4
Super Heavy Wt. + Transparencies 59.82 544.0
PHOTORECEPTOR
DRUM