Rice Lake Intercomp CS 5000 - Users Manual - Manual (Page 18)

CS5000, Users
Rev V, January, 2008
18
Troubleshooting
Caution: Changing some parts on the circuit board may cause a large
change in calibration while others may or may not change the calibration,
depending on the nature of the problem.
The base unit contains the “MPC board” and the “GPI Display board” The head contains
the “A/D board”.
Problem: base only displays “HO-00 HO-00 HO-00 HO-00“, no communication
Fix:
Check the power on the head (LED labeled POWER). If the head does have
sufficient power, this is probably a communication problem. Open the base unit
and locate the transceiver. If the LED lights labeled RXD Data and TXD Data are
not blinking, the transceivers are not communicating. Check to make sure the
base and head unit have power. Also make sure they are within range and rotate
units to try to get communication.
Problem: no power, nothing on display
Fix (applies to the base and the head):
If nothing can be seen on the display, there is probably no power reaching the base
circuitry. Possible causes at: bad or shorted battery pack, bad switch circuit, bad
voltage regulator. Power might be reaching the unit, but the power supply might be
shorted by a component or PCB trace in the power supply circuitry.
Problem: random display (display usually reads “8 88 8.8 88 8.8 88 8.”)
Fix:
On MPC board: check crystal (Y2). If the micro-controller is not receiving the
correct or any oscillation, the microprocessor is not able to function properly. Other
possibilities could be bad microprocessor (U1) on MPC board or display driver (U1
& U2 on “GPI DISPLAY” board) circuitry not functioning.
Problem: low battery indication won’t turn off
Fix:
The display will show a low battery condition (“LB-00
LB-00 LB-00 LB-00” for the head, or “BLB BLB BLB BLB” for the
base controller). Check if battery power is too low. Look at the cells and charger
circuit for these problems. If that is not the cause, the display driver( U1 & U2 on
the “GPI DISPLAY” board) or low voltage circuitry could be bad.