OHAUS AV114C, Service Manual

Page: 61 / 108

3-37
CHAPTER 3 REPAIR PROCEDURES
3.2.15 Vertical Stop Adjustment
This procedure is required when the Ratio Beam or the Sensor Board has been replaced.
Note Note
Note Note Note:
The vertical stop setting is the reference for the Ratio Beam height (horizontal position).
1. The Load Cell should be installed in the balance housing.
2. The ribbon cable from the Load Cell is plugged into the Main PC board.
3. Disconnect cable from the Load Cell to Ratio Beam (important step).
4. Attach voltmeter (DC range) to pins on Load Cell PCB test connector.
5. Apply power to the balance.
Figure 3-63. Test Connector Location.
Setting Vertical Stop
1. Refer to Figure 3-63. Attach a Digital Voltmeter to the pins indicated on the test connector
shown in Figure 3-64.
2. Measure the voltage when the Ratio Beam is at the bottom of the vertical stop.
3. Measure the voltage when the Ratio Beam is carefully lifted with thumb and forefinger until
it is at the top of the vertical stop.
4. If the two voltage values and are not the same, (+ or - 1.5 ...3.5V, difference max. 0.1V), the
vertical stop must be adjusted.
5. To adjust the vertical stop, refer to Figure 3-22, turn the vertical adjustment screw and repeat
steps 2 and 3 until the readings are within specifications (step 4).
Test Connector
Figure 3-64. Area of Detail.