Hitachi PH Instruction Manual page 42

1.5.3-4 Print target detector
(a) When a dedicated power supply is not used
If the print target detector current consumption is not more than 80 mA, no
dedicated power supply is required because adequate power can be supplied from
the IJ printer built-in power supply. In such a situation, make wiring connections
and perform setup as indicated below.
(i) Print target detector wiring method
Use a print target detector whose output is of a noncontact (transistor) type.
The best suited detector would be an amplifier-incorporated photoelectric
sensor that uses an optical beam for print target detection.
Print target detector
When a transmission type is employed,both
the light emitter and receptor must be
connected in the same manner.
(ii) Print target detector specifications
a
Output circuit
Print target detector
The IJ printer input circuit serves as a current-steered load for the print
target detector output circuit so that the printing start signal is entered
when the print target detector output transistor (Tr) turns ON. Ensure that
the employed output transistor (Tr) complies with the following
specifications.
b
Power supply specifications
(iii) Setup procedure
Turn ON switch SW2-5 on the EZJ95 board (terminal).
(Switch 2 is inside the cover. Do not operate it unless you have finished the
service education.)
1 2 34 5 6 78
+12V
Signal
GND
+12V
Signal
Tr
GND
Withstanding voltage : 12 VDC or more
Maximum drive current : 12 mA or more (IL
Residual voltage
Leak current
Supply voltage : DC12V
Current consumption : 80 mA or less
ON
(Switch is black.)
OFF
TB1
1 +12V
2 Signal
3 GND
SW2-5
GND
IJ printer
10mA)
≒
: 2 V or less
: 0.1 mA or less
●Connection of signals 1-31
+12V