October 2000 © TOSHIBA TEC
5 - 1
MY-1016 CIRCUIT DESCRIPTION
5. CIRCUIT DESCRIPTION
5.1 Meaning of Signals
The SFB feed sensor is a photo sensor which detects that the paper has been placed in the bypass tray.
The signal is usually at “High” level (no paper present) and goes LOW when the paper is placed. This signal
is sent to the MAIN PWA through the relay cable and RELAY PWA.
SFB clutch is an operation signal for the clutch to transmit driving from the copier to the SFB. The signal
output from IC36 (MFPCON) on the MAIN PWA connects to the transistor (Q16) on the RELAY PWA.
When the signal is at “High” level, Q16 turns ON to drive the clutch, causing the pickup roller to lower and
pull in the paper.
The SFB paper size sensor detects the width of the paper placed in the tray of the SFB. The brush
attached to the paper width guide is touching the pattern on the PWA, and one of the MPSS0 - 3 signals is
detected according to the position to which the paper width guide is slid. MPSS0 goes LOW at the
narrowest position, and MPSS3 at the widest position. (When each width sensor is at “Low” level, that width
is detected.) Since the detection areas overlap as shown below, two signals may be detected at the same
time depending on the position of the paper width guide
A4 Series
LT Series
MPSS 0
MPSS 1
MPSS 2
MPSS 3
A4
LT
H
H
H
L
A4-R
LT-R
H
H
L
H
A5-R
ST-R
H
L
H
H
A6
-
L
L
H
H
B4
COMP
H
H
L
L
B5-R
-
H
L
L
H
B6
-
L
L
H
H
Signal name
Part name
Functional description
Status
Note
MPESON
SFB feed sensor
Detects the loading of paper
Photo sensor
MPFCON
SFB clutch
Transmits driving force to
Low: ON
Magnetic
the rollers to pick up and
clutch
transport the paper
MPSS 0-3 ON SFB paper size
Paper size detection
Low: Detection
PWA pattern
sensor
