Damp Heater Control Circuit (Asd/Aud/Cnd/Twd/Sad Models) - Toshiba DP1600 Service Manual

7.8 Damp Heater Control Circuit (ASD/AUD/CND/TWD/SAD models)

When the machine is stopped for hours, the scanner damp heater heats the inside of the scanner to
prevent dew condensation on the original glass inner side surface, mirror, lens, and shading correction
plate.
The scanner damp heater operates on AC power input from the entrance to generate heat. A scanner
thermofuse is connected to the AC power supply line in series with the scanner damp heater. The scanner
thermofuse detects the temperature inside the scanner unit and supplies or shuts off the AC power to the
scanner damp heater according to the detected temperature.
The scanner thermofuse turns ON at 21.1°C or under, and turns OFF at 29.1°C or above. The AC power
from the entrance is always delivered while this machine is connected to the commercial power outlet,
regardless of the ON/OFF state of the main switch.
LVPS
Entrance
1
2
FG
December 2000 © TOSHIBA TEC
F1
AC/I/L HL
1
Noise
filter
AC/I/N HN
3
Scanner unit
FUS PWA
F1/F2
1 1
2 3
7 - 17
Scanner dump heater
Connector
1
2
Scanner thermofuse
Connector
3
1
08-08-01
1600/2000/2500 SCANNER