Service manual

7. ADJUSTMENT
Service Manual BSM-4100 7.1
After you replace the sensor board of the recorder unit with a new one, adjust the
paper and mark detection output voltages on the sensor control board as shown
below.
1. Connect 150 Ω resistors to pins 9 and 11 of the 12-pin connector cable from
the sensor control board as shown below.
2. Connect +5 V DC of a +5 V DC power supply to the two resistors and pin 7 of
the 12-pin connector as shown below.
3. Connect the ground terminal of the +5 V DC power supply to pin 8 of the 12-
pin connector.
4. Set the recording paper inside the paper magazine according to the operator’s
manual “Loading the Recording Paper” in Section 2 PREPARATIONS.
5. Draw out one page of the recording paper so that the small black square on the
corner of the paper is not over the mark detection sensor.
6. Adjust the PAPER VR and MARK VR so that pins 10 (PAPER output) and 12
(MARK output) of the 12-pin connector output a voltage within the range of
3.5 V DC to 4.0 V DC, respectively when the two sensors detect the white part
of the paper.
Sensors in the Recorder Unit
Adjusting the Output
Voltages with Digital or
Analog Multimeter
1
6
12
1
+5 V
GND
150
150
CN101
PAPER VR
MARK VR
Sensor Control Board
Ω
Ω
12-pin Connector
9
11
8
7
10