Power Supply Unit; Ac Filter; Dc Output Circuits; Heater Lamp Control Circuit - Toshiba e-STUDIO206L Service Manual

3.18 POWER SUPPLY UNIT

3.18.1 Construction
The power supply unit consists of the AC filter, insulation type DC output circuit, heater lamp control
circuit and damp heater power supply circuit.

1. AC filter

Eliminates noise from the outside and prevents the noise generated by the equipment from leaking
to the outside.

2. DC output circuits

Converts AC voltage input from outside to DC voltage and supplies it to each electric part. The DC
voltage is divided into the following two lines.
a. Main power switch line:Power supply used in the entire equipment during image forming process.
b. Door switch line:

3. Heater lamp control circuit

TRC (Triac) is driven by the heater control signal (HTR1ON/HTR2ON/HTRASTON) from the LGC
board and then AC power is supplied to each heater lamp (center, side and sub) in the fuser unit.
For e-STUDIO206L/256/306 / 207L/257/307, the sub heater lamp is not installed and the
HTRASTON signal is not supplied.
4. Damp heater power supply circuit
AC power input from outside is output directly to the FUS board and then supplied to the damp
heater in each section in the equipment. The damp heater switch is set to OFF as initial setting for
shutting off the power to the damp heater. When using the damp heater, the damp heater switch
needs to be turn ON after installing the equipment. The damp heater (including the FUS board) is an
option in NAD/MJD model, and is installed as standard device in other models.
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Two kinds of voltage (+5V, +12V) are output when the main power switch
of the equipment is turned ON.
Power supply used in the entire equipment during image forming
process, being supplied via the interlock switch. Two kinds of voltage
(+5VD and +24VD) are output only when the main power switch of the
equipment is turned ON and two doors (front cover and ADU unit) are
closed.
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e-STUDIO206L/256/306/356/456/506 / 207L/257/307/357/457/507
OUTLINE OF THE MACHINE
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