November, 99
All Rights Reserved
70
B-443 Bar Code Printer
Service Manual
5.7 Testing Sensors
A. Checking Ribbon Sensor
Switch the multimeter to the DC gear. Connect the black wire to DC GND, and the red wire to
PIN2 of JP2.
1. When ribbon is detected between TX and RX of the ribbon sensor, the measured voltage
should be 5 Vdc.
2. When ribbon is not detected between TX and RX of the ribbon sensor, the measured voltage
should be 0 Vdc.
The ribbon sensor is normal if the checking complies with the two cases above. Or else, the
ribbon sensor is out of order.
B. Checking DC Motor Encoder Sensor
Switch the multimeter to the DC gear. Connect the black wire to DC GND, and the red wire to
PIN2 of JP6.
1. When gap of the gear box is detected by the DC motor encoder sensor, the measured
voltage should be 5 Vdc.
2. When gap of the gear box is not detected by the DC motor encoder sensor, the measured
voltage should be 0 Vdc.
The DC motor encoder sensor is normal if the checking complies with the two cases above. Or
else, the DC motor encoder sensor is out of order.
C. Checking Gap Sensor
Do gap calibration first by holding the Pause button and activating the printer power at the same
time. If the calibration result is correct, go on and check the gap sensor. Switch the multimeter to
the DC gear. Connect the black wire to DC GND, and the red wire to PIN2 of JP5. Load label on
the printer.
1. When gap (backing paper only) is detected between TX and RX of the gap sensor, the
measured voltage should be 0 Vdc.
2. When gap (backing paper only) is not detected between TX and RX of the gap sensor, the
measured voltage should be 5 Vdc.
The gap sensor is normal if the checking complies with the two cases above. Or else, the gap
sensor is out of order.
Summary of Contents for B-443
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