Nellcor N-180 Service Manual page 69

Section 6: Disassembly Guide
LED Drive PCB and LED PCB
The LED Drive PCB and the LED PCB are connected together in a single
physical assembly. The connection is achieved via six electrical connectors,
three on each PCB.
1. Gain access to LED Drive PCB and LED PCB following instructions for
gaining access to components and removing front panel assembly.
2. Disconnect encoder assembly cable from CN7 of LED Drive PCB
8. Remove screws holding encoder assembly and bracket. É
4. Rotate encoder assembly bracket and remove two nylon spacers;
withdraw bracket through the front panel cutout.
5. Disconnect membrane flex circuit from CN6 of LED PCB.
6. Remove screw and PCB retention clip.
7. Atthis stage, you can remove the LED PCB and LED Drive PCB
together or simply remove the LED Drive PCB. To remove the
combination:
a. Remove three screws holding LED PCB.
b. Remove the mated LED PCB and the LED Drive PCB.
c. To separate PCBs, simply pull the PCEs apart.
This action disconnects three 10-pin connectors (CN2, CN3, CN4)
on the LED Drive PCB that respectively connect to CN1, CN2, and
CN3 on the LED PCB.
Sensor Connector Assembly
Remove the sensor connector to replace the sensor connector assembly door or
the sensor connector. To remove the sensor connector assembly:
1. Gain access to sensor connector assembly following instructions for
removing front panel assembly.
2. Remove screws fastening connector housing to sensor door (figure 6-11).
8. Remove sensor connector.
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