Welch Allyn Propaq LT 802LT0N, Service Manual

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12 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor
Monitor fails to power up beyond the
initial screen. Button board not connected. Connect the button board to the main board.
“Separating the top and bottom chassis
halves”
on page 31.
Monitor is in the cradle and does not
power up, and the cradle power
indicator is off. The battery is discharged and
the cradle is not powering the
monitor. Verify that AC power is on, that the power
adapter is plugged into AC power and into the
cradle, and that the monitor is fully seated in
the cradle.
Defective power adapter. Replace the power adapter.
The charger input fuse is blown. Replace the fuse. “Replacing the fuse” on
page 47.
Monitor is latched in the cradle but
does not power up. Power indicator
on the cradle is on. Open the monitor power switch. Replace the bottom chassis (which includes
the power switch). “Removing the main board
from the bottom chassis assembly” on
page 36.
Problem with the cradle power
board. Replace the cradle power board.
“Disassembling the cradle” on page 47.
Problem with the monitor. Send the monitor to an authorized Welch Allyn
Service Center for service. (See
“Returning
products” on page 6.)
Monitor battery fails to charge.
DC power is applied but the power
indicator on the cradle remains off. Blown power input fuse on the
charger I/O panel. Replace the fuse. “Replacing the fuse” on
page 47.
Monitor battery run time duration is
less than specified. The battery is deficient. Replace the battery. “Removing the lithium ion
battery assembly” on page 29.
Radio cannot link up to the
Acuity Central Station. See “Radio” on page 14.
Yellow indicator on the cradle. Monitor current draw is too high.
Cradle circuit breaker is tripped.
Charger state 1. Service the monitor or the cradle.
Monitor has no battery pack.
Charger state 4. Install the monitor battery pack. “Removing the
lithium ion battery assembly” on page 29.
Battery pack temperature is out
of range. Charger state 3. Return the battery pack to within the specified
temperature range (0

C

- 40

C).
Battery pack voltage is too low
or the battery fuse is blown.
Charger state 4. Replace the battery pack. “Removing the
lithium ion battery assembly” on page 29.
Battery pack fails to charge in
the specified time. Charger
state 5. Remove the monitor from the cradle and
reinsert it, and then attempt again to charge. If
the timeout reoccurs, replace the battery pack.
“Removing the lithium ion battery assembly”
on page 29.
Battery cell(s) over voltage;
probably a charge imbalance.
Charger state 7. Replace the battery pack. “Removing the
lithium ion battery assembly” on page 29.
Charger board failure. Examine the cradle internal cabling, the cradle
power board, and the interconnect board.
“Removing the power/USB flex connector from
the bottom chassis”
on page 46.
Missing or erroneous LCD characters Faulty LCD. Replace the LCD. “Disassembling the top
chassis” on page 34.
Symptom Possible cause Possible corrective action