Panasonic FP-7742 / FP-7750 (serv.man2) Service Manual ▷ View online
2-4
2)
Maintain standard toner density
While checking the output voltage of the TDC sensor for every copy, control the
timing of toner supply to the developer unit so that the output voltage is 2.5V at
all times to keep the toner density constant.
Supply toner: supply from reserve tank for 6 seconds
(amount of toner supply: approx. 1.4 g)
(amount of toner supply: approx. 1.4 g)
Rotate bottle for 7 seconds: supply toner to reserve
tank. (Toner is not supplied to developer unit.)
tank. (Toner is not supplied to developer unit.)
Check TDC sensor output voltage at copying (or mixing).
Is the measured output voltage over 2.5V?
Do not supply toner.
Note) During bottle rotating, toner is not supplied.
YES
NO
(Reference 1) Toner supply route
(Reference 2) Forced toner supply
Note: Bottle rotation means toner is being added to the reserve tank, not the
developer unit. This is not a final confirmation for proper TDC adjustment.
Reserve tank (hopper)
Developer unit
Bottle
Supply toner: supply for 4 seconds from reserve tank.
(amount of toner supply: approx. 1.1 g)
(amount of toner supply: approx. 1.1 g)
Rotate bottle for 7 seconds: supply toner to reserve tank.
(Toner is not supplied to developer unit.)
(Toner is not supplied to developer unit.)
Perform twice.
New Function
2-5
2. 3 Trouble Avoidance Mechanism
When some malfunction happens, this mechanism allows regular copy operation
without error conditions (service man call) (providing the malfunction does not affect
the basic copying operation and the appropriate function is not selected).
<Indication>
Appropriate function selected
Appropriate function not selected
The selected function is unavailable,
Normal indication of copying
repair is necessary,
select others.
"(EX-XX)"
EX-XX
XXXXXX
(Error code)
(Electronic counter value at malfunction)
User mode
Service mode
Note: Only 30 records can be stored. Earliest records are
replaced by new ones as space is required.
2-6
<Self-recovery item>
Item
Error code
Copier paper feed ( upper )
E2-01
Copier Paper feed ( lower )
E2-02
System stand paper feed ( upper )
E2-03
System stand paper feed ( middle )
E2-04
System stand paper feed ( lower )
E2-05
System stand paper feed timing
E2-10
LCC Lift up
E2-06
LCC Lift down
E2-07
Duplex unit ( length )
E6-03
Duplex unit ( width )
E6-04
duplex unit ( sensor )
E6-05
Stapler
E7-06
Sorter
E7-07
ADF ( motor )
E7-10
ADF ( sensor )
E7-11
Accessories
Copier
New Function
2-7
2. 4 ETP
TM
System
-Evaluative Toner Processing
To maximize the number of copies which can be produced for each bottle, toner
cleaned off of the drum needs to be returned to the developer for re-use. Under
normal circumstances, the copy process can damage some toner. In addition, other
undesireable materials may be cleared from the drum surface and mixed with re-
useable toner (such as paper dust, etc.).
ETP allows us to maximize toner yield, while avoiding the potential side effects of
recycling used toner.
<Process>
There are two methods of handling the mixture of materials found in the cleaning
unit following the drum cleaning.
This handling is normally in the "Recycle" mode, but on a regular basis is switched to
the "Refresh" mode. During the "Refresh" mode, the undesireable particles are
removed from the developer unit, and forwarded to the waste toner bottle to be
discarded.
<Control>
Every programmed copies (500/1000/1500/2000 as set by F5-65), ETP directs the
recycle solenoid to switch from Recycle to Refresh Mode for the next 100 copies.
During the refresh cycle, the cleaning unit is emptied into the waste toner bottle,
there by removing all undesireable particles from the system. This process is
completed unnoticed by the end user during regular operation.
Recycle Mode
Developer
unit
unit
Waste toner
bottle
bottle
Drum
Cleaning
unit
unit
Cleaning
unit
unit
Developer
unit
unit
Drum
Refresh Mode
Note: ETP also monitors TDC. If the ratio becomes too high, the system will initiate
the Refresh Mode automatically.
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