Toshiba e-STUDIO 4500c, Service Manual

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August, 2006 Machine Configuration
Spec-27
No. Component Function
S46 Double-Feed Sensor
Receives the light emitted from the double feed
detection LED and reflected from the surface of
each sheet in the paper path. Signals an error if the
thickness of the paper is not the same as the
previous sheet.
S47 Guide Plate Position Sensor
S48 Relay Sensor Detects jams at the top of the vertical paper path.
S49 Registration Sensor Detects the leading edge of the paper and switches
off the registration motor and stops the registration
roller briefly but long enough to correct buckle the
paper.
S50 Paper Exit Sensor Detects the leading and trailing edge of each sheet
at the paper exit slot to check timing and detect
jams.
S51 Bypass Paper Sensor Detects the presence of paper in the bypass tray.
S52 Bypass Paper End Sensor Signals paper out when the last sheet feeds from
the bypass tray.
S53 Bypass Paper Size Sensor Reads the positions of the side fences (manually
adjusted) to detect the width of the paper in the
bypass tray. (Paper length is read with pulse counts
from the registration sensor.)
S54 Paper Exit Relay Sensor Detects paper jams at the paper exit if the paper
does not arrive or leave the machine at the
prescribed time.
S55
Copy Tray Full Sensor
(Option) Detects when the Copy Paper Tray B75 is full and
temporarily pauses printing so the operator can
remove the stack from the tray and continue.
S56 TD Sensor - M Monitors the amount of toner in the developer/toner
mixture in the development unit of the Magenta
PCU.
S57 TD Sensor - K Monitors the amount of toner in the developer/toner
mixture in the development unit of the Black PCU.
S58 Temperature/Humidity
Sensor - PCU K The temperature and humidity readings of this
sensor are referenced to a lookup table stored in
the ROM to 1) Correct the charge roller voltage 2)
Adjust the operation of the Peltier unit, and 3) Set
the length of time the agitators in the development
unit rotate to mix the toner and developer.
S59 TD Sensor - Y Monitors the amount of toner in the developer/toner
mixture in the development unit of the Yellow PCU.
S60 TD Sensor - C Monitors the amount of toner in the developer/toner
mixture in the development unit of the Cyan PCU.
S61 ITB Position Sensor 2 Reads the encoder film strip on the front edge of
the ITB and sends the sub scan scale signal to the
CPU.
S62 ITB Position Sensor 1 Reads the encoder film strip on the front edge of
the ITB and sends the main scan scale signal to the
CPU.
S63 Potential Sensor - K Reads the potential sensor pattern from the surface
of the drum in the black PCU.
S64 Potential Sensor - M
Reads the potential sensor pattern from the surface
of the drum in the magenta PCU.
S65 Potential Sensor - C Reads the potential sensor pattern from the surface