Detecting Jams - Toshiba MJ-1027 Service Manual

K. Detecting Jams
The following sensors are used to detect the presence/absence of paper and to make sure that
sheets are moved properly:
Inlet sensor (PI1)
●
Delivery sensor (PI3)
●
Stapling tray sensor (PI4)
●
Buffer path paper sensor (PI14)
●
A jam is identified with reference to the presence/absence of paper at each specific sensor at the
times programmed in the memory of the microprocessor (CPU) on the finisher controller PCB.
When the CPU identifies a jam, it suspends the finisher's delivery operation and informs the
host machine DC controller of the presence of a jam. After the paper jam is removed, the buffer path
inlet paper sensor (PI17) checks whether or not copies are being detected in addition to the above
four sensors (inlet sensor, delivery sensor, stapling tray sensor and buffer path paper sensor). If the
sensors detect a copy when all doors are closed, the finisher unit judges that paper jams have not
completely been removed, and sends the paper jam removal signal to the host machine again.
The tray-1 paper sensor (PI11) and tray-2 paper sensor (PI12) are not used to detect jams.
PI3
PI4
Figure 2-256
CHAPTER 2 FINISHER UNIT BASIC OPERATION
PI14
PI1
No. Sensor names
PI1 Inlet sensor
PI3 Delivery sensor
PI4 Stapling tray sensor
PI14 Buffer path paper sensor
Table 2-205
2-51