Toner Empty Control - Sharp Z-21 Service Manual

5-2. Toner empty control

1
When the paper entry sensor (Z-21) or the COPY key (Z-26) is
turned on, if the toner control sensor output (TCS) is HIGH, the
toner supply solenoid (THS) is turned on to supply toner.
2
If TCS is not driven LOW after 60 sec of toner supply, the
developer cartridge replacement lamp is lighted and the machine
is stopped.
3
In the case of the Z-26, if the toner control sensor signal keeps
HIGH during 12 sheets of multi copying, the developer cartridge
replacement lamp is lighted and the machine is stopped.
Paper in sw
Copy key
TCS
(Toner control sensor)
300msec
THS
(Toner supply solenoid)
Bias
(DV-Bias)
200msec
Motor
Copy lamp
H.V.
(High voltage)
Grid
Table position
TEL
(TD cartridge indicator)
10sec
1.0sec
2.4sec
1.0sec
5.0sec
54sec
– 15 –
Toner enpty
200msec
1.9sec
x 582 pulese
Home position
250msec
500msec