Assembly J: Black Mark Detector Adjustment - Epson EU-T432 Technical Manual

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Assembly J: Black mark detector Adjustment

Adjustment
step
1 Connect the FFC terminal No.12 to an
oscilloscope to display the output power voltage
of the B.M. detector on the oscilloscope screen.
2 Input DC5 V to the FFC terminal No. 13.
DC5 V
3. Insert a "Kodak Gray Card" into the paper
entrance.
("Kodak Gray Card": A commercially available
card for adjusting exposure.)
4. Adjust the output power voltage of the B.M.
detector at 1.74 V using the variable resistor on
the circuit board assembly.
Rev. A
Adjustment procedure
circuit board
GND
oscilloscope
FFC
Make sure that the gray side of the card is inserted
along the paper guide which the B.M. detector
sub-assembly is installed.
B.M. detector
sub-assembly
Turn the slot on the variable resistor to the right
and the left with a tool such as a flat-head driver,
to adjust the output power voltage.
If the reflectance of black marks on the paper is
over 10%, adjust the output voltage to 2 V or
more with a 25% or less reflectance for the black
marks.
EU-T432 Technical Manual
Adjustment point
paper guide
<Cross-section>
gray side of the gray card
variable resistor
Assembly and Disassembly 6-27