4.2 Troubleshooting Tables
Table 4-2 Keyboard and Display Faults
Wiring from keyboard to J130A. Keyboard
failure. Does not
Machine may be in sleep mode. Is front panel
Check display contrast.
Machine not getting power.
No display, front panel LED off, but print head
initializes at start up.
See Table 4-1 for power ON an initialization
Display does not
Meter appears to be "stuck" on the same dis-
play for an extended period of time.
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
4 • Troubleshooting/Diagnostics
Poor connection at keyboard, wiring and con-
nection at Main Logic Board, J130A.
Press any key to wake unit.
Adjust display contrast as required.
Power cord not plugged in. Power cord plugged
into a switched or defective outlet. Try another
wall outlet. If unit is plugged into a power strip,
move the power cord to a functioning wall out-
Check connector J130B (next to J130), and
harness to J130B.
Power cycle the meter to reboot and start over.