Welch Allyn Spot Vital Signs Service Manual

Service Manual Disassembly and repair 47
Nellcor board
Follow all the previous steps and then:
1. Remove the three phillips head screws along with the nuts and spacers from the
SpO
2
PCB.
2. Remove the SpO
2
module (Nellcor MP205) from the main PCB.
Note
If a failure occurs in the MP205 PCB (obsolete), update to a Nell-3 PCB (704870)
and update the Main PCB (403290). The new Main PCB (403290) correctly
operates an MP205, an MP506, or a Nell-3 PCB. If the Nell-3 is used with the old
main PCB, an E7 error occurs after connecting the power.
For MP205 PCB: Verify the following:
• There are two shunts at the top of the jumper row on the PCB before
installing on the Main PCB.
• The two locking tabs on the connectors of the Nellcor MP205 PCB are broken
off before installing onto the Main PCB.
• The nylon washers are located on the main PCB when reassembling the
SpO
2
PCB to the Main PCB.
For MP506 or Nell-3 PCB: Verify the following:
• The DIP switch positions are (1-on, 2-on, 3-off and 4-off) on the new PCB and
the two locking tabs on the connectors of the Nellcor MP506 PCB are broken
off before installing onto the Main PCB.
• Verify that the nylon washers are located on the main PCB when
reassembling the SpO
2
PCB to the Main PCB.
Phillips screws
Spacers (3 places)

Welch Allyn Spot Vital Signs Specifications

General

Pulse Rate Measurement	Yes
SpO2 Measurement	Yes
Display	LCD
Power Source	Rechargeable battery or AC power
Temperature Measurement	Yes
Connectivity	Optional with wireless connectivity
Pulse Rate Range	30-220 bpm
NIBP Diastolic Range	20-195 mmHg
SpO2 Range	70-100%
Temperature Range	80 °F to 110 °F (26.7 °C to 43.3 °C)
Battery Life	Approximately 8 hours of continuous operation
Weight Capacity	Not applicable
Height Measurement Range	Not applicable