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LCT-1500 TRAY PAPER FEED/CONVEYANCE SECTION
[4] 1500 Tray Paper Feed/No Paper
Detection Control
The 1st paper feed from the 1500 tray takes place as a result
of the transmission of the rotational force of M140 (LCT paper
feed) by means of CL2 (LCT 1st paper feed (1500)). The paper
feed roller does not touch the paper at this time, so SD140 (LCT
1st paper feed (1500)) swivels, bringing the paper feed roller
into contact with the paper.
The fed paper is conveyed to the paper feed unit by drive force
from M140 which is transmitted to the conveyance roller via
CL3 (LCT conveyance).M140, CL2, CL3 and SD140 are driven
by the CB (control board). Related signals are PS140 (LCT no
paper detection (1500)), PS146 (LCT conveyance (1500)) and
PS200 (LCT pre-try (1500)).
1. Operation
a. 1st paper feed operation timing
(1) Start of paper feed for 1st copy
Timing determined by the P counter from when the
charging corona unit goes ON
(2) Start of paper feed for 2nd copy
Specified period after PS14 (registration) goes ON
during the 1st copy operation
(3) OFF timing
Specified count on the P counter
120-B9
120-B1
120-B2
120-B1
120-B7
120-B8
120-A1
120-A2
120-A3
CL3 DRIVE
78-2
88-5
24VDC
40VDC
88-3 PGND
CL2 DRIVE
SD140 DRIVE
SGND
120-B4PS141
120-B55VDC
PS146
PS200
5VDC
M140 CONT
M140 PLL
120-A4SGND
120-A5M140 CLOCK
CL3
710-1
710-2
710-3
713-1
713-2
713-3
712-1
712-2
712-3
CB
DCPS
CL2
SD140
PS140
PS146
PS200
M140
b. No paper detection control
When there is no more copy paper in the LCT1500, PS140
goes ON, and a message appears on the operation panel.
2. Signals
a. Input signals
(1) PS140 (PS140 → CB)
No paper detection signal from the 1500 tray
[H]: No paper in tray
[L]: Paper in tray
(2) PS146 (PS146 → CB)
Paper passage detection signal from the 1500 tray
conveyance section.
This signal is [L] while paper is passing through the
1500 tray conveyance section.
(3) PS200 (PS200 → CB)
1st paper feed detection signal from the 1500 tray
This signal becomes [L] when paper is detected.
b. Output signals
(1) M140 CONT (CB → M140)
M140 ON/OFF control signal
[H]: M140 OFF
[L]: M140 ON
(2) M140 PLL (CB → M140)
PLL control clock signal for M140
(3) M140 CLOCK (CB → M140)
M140 speed instruction signal
(4) CL2 DRIVE (CB → CL2)
ON/OFF drive signal for CL2
[H]: CL2 OFF
[L]: CL2 ON
(5) CL3 DRIVE (CB → CL3)
ON/OFF drive signal for CL3
[H]: CL3 OFF
[L]: CL3 ON
(6) SD140 DRIVE (CB → SD140)
ON/OFF drive signal for SD140
[H]: SD140 OFF
[L]: SD140 ON
LCT-1500 TRAY PAPER FEED/CONVEYANCE SECTION-1
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