Sharp DM-1500, Service Manual

Page: 36 / 188

c. POD jam
1) POD does not turn on within 2.9 sec
after turning on the resist roller.
2) POD does not turn off within 1.5 sec
∼
2.7 sec after turning off PPD2.
6. Process unit new drum detection
mechanism
1) When the power is turned on, the detection gear 38T is rotated in
the arrow direction by the detection gear 20T to push the micros-
witch (process detection switch) installed to the machine sensor
cover, making a judgement as a new drum.
2) When the detection gear 38T turns one rotation, there is no gear
any more and it stops.
The latch section of the 38T gear is latched and fixed with the
projection of the process cover.
7. D-D (Duplex to Duplex) mode paper/
document transport (DM-1505 only)
A. Initial state
Set duplex documents on the document tray.
Set paper on the cassette. (In the duplex mode, the manual feed tray
cannot be selected.)
B. Front copy
Document transport: The document feed roller feeds the document
from the paper feed roller to the PS roller.
→
The document is exposed in the exposure
section, and sent to the document exit section
by the transport/paper exit roller.
→
R-SPF gate solenoid ON
→
The document is sent to the intermediate tray
(but not discharged completely.)
→
The document is stopped once, then
switchback operation is performed. (To the
back copy)
Paper transport: The document is passed through the paper feed
roller and the PS roller by the paper feed roller
and the images on the front surface are trans-
ferred.
→
The paper is passed through the fusing sec-
tion and the lower side of the gate section to
the paper exit tray side, (but not discharged
completely.)
→
It is stopped once and switchback operation
is performed. (To the back copy)
Gear 20T
Process detection switch
Gear 38T
Gear notch
Gear pawl
Projection
Gear notch
Gear pawl
Projection
Gate OFF
Lower Side of Gate
Gate ON
DM-1505
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