Covidien WarmTouch, Service Manual

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Troubleshooting
6-4 Service Manual
6.3.3
Component Descriptions
Display
The unit uses a 2.5”, QVGA (320 x 240) TFT liquid crystal display (LCD) to relay
status and provide interactive information to the user. The display is located
inside the unit’s front enclosure behind the UI PCBA (see
Figure 10-7 on
page 10-8). The display is controlled by the UI microprocessor on the UI PCBA
and connects to the PCBA via a cable that is fixed to the display.
Keypad
The keypad on the front of the unit consists of an On/Standby key and seven
multifunction control keys. The On/Standby key switches the unit between
Standby mode and Ready mode (see
Overview of Warming Unit Operating
Modes on page 4-3). The control keys perform a variety of functions depend-
ing on operating context.
The keypad is built into the die-cut panel that attaches to the unit’s front enclo-
sure. The panel includes an LED that indicates warming unit status:
•
Green for operating modes
•
Amber for standby mode
•
Off when disconnected from power
The keypad connects to the UI PCBA via a fixed cable that is routed into the
unit through a slot below the panel (see
Figure 10-4 on page 10-6).
USB Port
To facilitate software updates, error log downloads, and other service tasks
performed at Covidien Service Centers, the warming unit can communicate
with a computer via its USB interface. The USB port is located under a protec-
tive cover at the back of the unit (see
Figure 10-18 on page 10-23). An internal
USB cable connects the port to the UI PCBA (see Figure 10-17 on page 10-22).