4-10
UP-D70/D70A (UC,CE)
s) Ribbon code sensor/luminance quantity adjustment (CN5-3, 19)
Function
: This is a transmission type sensor that reads ribbon code and starting mark on
the ink ribbon. Pair LED luminance is set to obtain the most suitable
luminance quantity. When reading ribbon code every time, the threshold
level value for judging L or H is changed to the most suitable value.
Level
: Ribbon code portion is H, others are L
Check method : Make sure the threshold level, ribbon cassette should be inserted, ribbon
should be rotated correctly, make sure the sensor output.
t) OHP sensor/luminance quantity adjustment (CN5-15, 21)
Function
: This is a transmission type sensor that detects paper kind after feeding paper.
Pair LED luminance is set to obtain the most suitable luminance quantity.
When reading ribbon code every time, the threshold level value for judging L
or H is changed to the most suitable value.
Level
: Ordinary paper is H, OHP is L.
Check method : Make sure the threshold level, transmit the paper, and make sure sensor the
output.
u) Head thermistor (CN7-27)
Function
: This thermistor measures temperature of the thermal head.
Level
: Approximately 2.5V at the normal temperature (25˚C)
Check method : Measure the voltage of thermistor.
v) Room thermistor (CN4-17)
Function
: This thermistor measures the temperature at the inside of the unit.
Level
: Approximately 2.5V at the normal temperature (25˚C)
Check method : Measure the voltage of thermistor.
