Front Case Disassembly Procedures - Philips M3921A Service Manual

Disassembly Procedures (A3)

Front Case Disassembly Procedures

Note
80
Procedure to remove SpO
assembly, and encoder assembly:
• SpO module: remove the three screws located at the corners of the
2
SpO module and lift off the ground wire and the foil shield. Then pull
2
the SpO module straight up to disengage it from main PCB.
2
Important for reassembly: the insulator goes on the non-foil
screw hole. The washers, star-washers, and foil screw holes
should be assembled together.
• ECG/Temp cable/connector assembly: unplug the connector from the
main PCB. Remove the screws fastening the ECG connector to the front
case, rotate the temperature connector counter-clockwise to unscrew it
from the fastening nut on outside of the front case.
Disconnect the white cable and move the SpO
cable before attempting to disconnect the temperature connector.
• The encoder assembly: unplug the connector from the main PCB.
Remove the wheel, as described in step 1A. Use a 9/16" hex socket to
unscrew the fastening nut on the outside of the front case. The encoder
can then be pulled away from the front case.
During reassembly, the ribbon cable should orient towards the PCB, and
after connection, the excess should be fed under the PCB.
Procedure to remove the main PCB:
1. Disconnect the connectors from the main PCB for:
• Switch panel
• SpO
2
• ECG/Temp
• Encoder
• LCD (display). Do not cut the tie wrap over the connector, slide it
out of the way to remove the connector.
• Backlight
module, ECG/Temp connector
2
front connector ground
2
Chapter 6 - Disassembly Guide