DUPLO SEIKO CORPORATION Duprinter DP-330, Service Manual

Page: 50 / 330

49
x
Platemaking / Master Feed / Ejection Section
chap.2
440317
(4) Master Detect Sensor
Reflection light amount
The larger the reflection light amount is, the
smaller the output voltage is. The smaller the light
amount is, the larger the output voltage is.
The value is checked with the HELP 07.
Description
The master detect sensor is located at a fixed
distance relative to the drum. By means of reflected
light, this sensor senses master setting errors.
When a master setting error occurs,
"MASTER
SETTING ERROR" is displayed.
While the master is not set to the drum, printing
will not start even if the PRINT key is pressed.
Instead,
“CANNOT PRINT”
is displayed.
Master detect sensor PCB
CN10-1 CN1-1
-2
-3
-3
-2
5V
5V
5V
VR1
0
5V
Red
Blue
Black
M a i n P C B u n i t
Circuit
HELP mode H-07
\
see p.235
Sensitivity adjustment of master detect sensor
Adjust variable resistor dial VR1 so that the
difference between the black and white levels is 30
or more. Preferably, the value when master
presence is sensed should be around
10
.
Master detect sensor
440W10e