Power Supply Unit; Construction - Toshiba e-STUDIO166 Service Manual

14. POWER SUPPLY UNIT

14.1 Construction

The power supply unit consists of the AC filter, insulated-side DC output circuit, high-voltage output cir-
cuit, and heater lamp control 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 circuit (Low-voltage output circuit)
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 switch line:
b.Cover switch line:
* When the equipment is in Energy Saving Mode (Auto Shut Off Mode), only the +5VB for the main
switch line is supplied.
3) High-voltage output circuit
Generates the output currents/voltages for the charger, developer, transfer and separation biases,
based on the +24V voltage which is generated by the DC output circuit. For details of the high-volt-
age output circuit, see the following.
P.11-5 "11.4 High-Voltage Output Control Circuit"
4) Heater lamp control circuit
TRC (Triac) is driven by the heater control signal (HTON1B/HTON2B) from the MAIN board and
then AC power is supplied to each heater lamp (center and side) in the fuser unit. For details of the
heater lamp control circuit, see the following.
P.13-5 "13.5 Fuser Unit Control Circuit"
© February 2007 TOSHIBA TEC CORPORATION All rights reserved
Power supply used in the entire equipment during the image forming process.
Four kinds of voltage (+5V, +5VB, +24V and +24VDF) are output when the
main switch of the equipment is turned ON.
Power supply used in the entire equipment during the image forming process.
It is supplied via the cover switch. This voltage ( +24VCOV-OFF) is output
only when both the main switch of the equipment and the cover interlock
switches are turned ON (when the front and ADU covers are closed).
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