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Chapter Three – Troubleshooting Guides
58
3.15 WEIGH SYSTEM TROUBLESHOOTING GUIDE – OPTIONAL EQUIP-
MENT
NOTE
Before proceeding, ensure the foot board is properly installed and electrical connections are made. Prior to
replacing any circuit boards, ensure applicable cables and connections are intact (visually and mechanically).
To check for +5 VDC at various points called out in the troubleshooting, use digital ground as a reference point
(negative side of C18 on litter CPU board). When measuring 110 VAC at any point, use only the neutral (white)
side of the power line as a reference point. DO NOT use digital ground as a reference point when measuring
110 VAC.
PROBLEM/SYMPTOM
SOLUTION(S)
Weigh system display will not turn on.
A. Check scale power supply board (p/n 3000–
307–953) at connector JP1 for +12 VDC at pin1
using pin 2 as a reference point (see page 199 for
board location). If voltage is present, check for 110
VAC into connector J1/J2 and fuse F3. If 110 VAC
is present, and fuse is O.K., replace scale power
supply board.
B. Check scale keyboard (p/n 3000–507–949).
Using a voltmeter, verify switches are not defec-
tive. If switches are O.K., check for +5 VDC at
connector P1, pin 10. Replace switches as neces-
sary (see page 202 for board location).
C. Check cables and connections for the following
board assemblies. Examine and replace any
blown fuses.
1.) Scale CPU (p/n 3000–307–959).
2.) Scale/Menu IFC board (p/n 3000–507–957).
3.) Serial IFC Board (p/n 3000–300–965). If
cables and connections are O.K., replace board
assemblies in the order listed. (see page 199 &
202 for board locations).
Weigh system turns on, back light does not.
A. Check display at red and black wires, cable 2,
for 100 VAC at 400 Hz. Do not measure using
scale ground as reference. If voltage is present
and display will not light, replace scale display (p/n
3000–507–837). (see page 202 for location). If
voltage is not present, check scale/menu IFC as-
sembly (p/n 3000–507–957) at connector P4, pin 7
for +12 VDC. If voltage is present, replace scale/
menu IFC (see page 202 for location).
Weigh system not weighing accurately.
A. See Weigh System Diagnostics (page 112 &
113).
1.) Check each load cell.
2.) Re–calibrate weigh system.
Replace load cells as needed (see page 114).
B. Check cables and connections to scale CPU
board assembly. If cables and connections are
O.K., replace scale CPU board p/n 3000–307–959
(see page 115).
Summary of Contents for Secure 3000
Page 78: ...Notes 78 ...
Page 106: ...Notes 106 ...
Page 184: ...Notes 167 2 ...
Page 241: ...Appendix B Circuit Board Locations Bed Wiring Diagrams 222 This page intentionally left blank ...
Page 243: ...Appendix B Circuit Board Locations Bed Wiring Diagrams 224 This page intentionally left blank ...
Page 249: ...DH 3 94 3000 000 020 REV B 420 Alcott Street Kalamazoo MI 49001 ...