Eagle Microsystems LP4300 User Manual
Page 5
SECTION 3.0 TROUBLE SHOOTING
The following is a list of potential problems and likely cures.
1. Inaccurate but repeatable weight readings:
a.
Adjust span on read-out (see instrument manual)
2. Blank or drifting display:
a.
Consult the instrument manual.
b. Look for loose connection in hook-up cable at the instrument or in the Summing Box.
See Section 4.0
d. Look for moisture in the Summing Box
c.
Test for bad load cell (see section 4.2)
SECTION 4.0 SERVICING
4.1 Checking the connections to the Summing Box.
1. Locate the Summing J Box under the scale and remove the lid.
2. View and compare all connections to Figure 2.
3. Check all connections by lightly pulling on each lead. Tighten terminal connections as
needed.
4. If problem persists, press lightly on the circuit board itself and check meter response.
Replace board if required.
Note: Make sure when replacing the cover that the box is dry and the cover is tight.
R1
R1
R1
R1
R1
+EXCT
+
-
-EXT
+SIG
-SIG
SHLD
+E
-E
+S
-S
SH
+E
-E
+S
-S
SH
+E
-E
+S
-S
SH
+E
-E
+S
-S
SH
EAGLE MICROSYSTEMS
SJB4-S
Figure 2