Stryker Medical 2025, Maintenance Manual

Page: 31 / 140

Electrical Troubleshooting
30
SCALE SYSTEM TROUBLESHOOTING GUIDE (CONTINUED)
PROBLEM/FAILURE RECOMMENDED ACTION
Scale weighing too heavy – one position. A. Check for any mechanical interference between
the weighing surface and the stationary sections of
the bed.
B. If in Trend position, calibrate bed (see page 21)
and check again.
During calibration, display reads “Check Corners”. A. Check each corner and verify the load cells are
working and changing value.
Using a 50 pound weight at each corner
of the bed, verify the counts change
approximately 375 to 425. Example –
right corner without weight = 400. After
adding weight should read 825.
B. If corner does not respond correctly or is out of
spec., replace load cell.
When checking weight at right, foot corner, the
weight goes negative. A. Check left load cell (in check corners mode).
Must read at least +300 with no weight on the bed.
No change in weight. A. Verify cables have been installed correctly and
are not damaged.
B. Check if voltages on CPU are correct at
HDR32, Pin 1 (Grd) to Pin 4 (5Volts), Pin 1 (Grd),
Pin 7 (–5 Volts). If not, replace the CPU board
and the power board (see page 19 & 22).
C. If voltages are correct, replace the CPU (see
page 19).
D. If still no change, replace load cells, CPU and
power boards (see page 19, 20 & 22)