Hill-Rom VersaCare P3200, Service Manual

Page: 112 / 379

2.65 Junction Board Debugging—IntelliDrive® Transport System
Chapter 2: Troubleshooting Procedures
2.65 Junction Board Debugging—IntelliDrive® Transport System
NOTE:
When working on IntelliDrive® Transport System use extreme caution when
servicing the product. Whenever you are measuring voltages or making
adjustments to the Junction board, it is suggested that you take the bed out of
steer which will raise the wheel and prevent the bed from moving.
Enable Switches
The enable switches are installed in the handles at the handle grip. If either
switch is depressed, while force is applied to the handles, the bed will move. If
the handles are pushed towards the patient, the bed will move forward. If the
handles are pulled, the bed will move backwards. It is fairly simple to check
the enable switches. First remove power supply cover so you can see the
Junction board. Make sure both enable switches are plugged into the Junction
board at P2 and P5. The switches are connected in parallel, or combined on the
Junction board. The following voltages will be observed on a working system.
P6.1 4.0-5.1 V
P6.3 0-.5 V when switch is opened
P6.3 4.0-5.1 V when switch is depressed or closed
If you suspect a switch is not working correctly, the switches can be unplugged
at P2 and P5. A meter can be used to measure switch continuity from the end of
the switch cable. A working switch will close only when the switch is
depressed. If it is always opened, or always closed, the switch or cable is
defective. In either case replace the handle assembly. The bed will operate if
only one switch functions. You can unplug the defective switch from the
Junction board and verify the bed power unit operates when using the working
switch.
If there is not a voltage at P6.1, verify the battery voltage or the battery
charging voltage is present. The battery voltage can be measured at P4.8. This
voltage will be greater than 32 V when the bed is plugged into the AC wall
outlet. When the bed is unplugged from the AC outlet, the battery voltage at
P4.8 will be greater than 22 V, if the batteries are charged. If no voltage is
present, or the battery voltage is low, go to the Battery Checkout procedure.
If the switches check out correctly, and the voltage at P6.3 does not toggle
when the switch is depressed, there may be a problem on the Junction board or
the 14-pin connector at P6. Unplug the cable connected to P6, and inspect the
Page 2 - 78 VersaCare™ Bed Service Manual (MAN333 REV 2)