8-10 SERHT50NA A0808
MAIN BOARD ASSEMBLY REPLACEMENT
Refer to drawing Figure 9-1, Internal View, Figure 9-3, Final
Assembly Front View, Figure 9-4, Main Board with Mounting
Hardware and Figure 9-5 Main Board Tubing Connection.
NOTE: Any electronic malfunction that is not resolved with the
replacement of the F
ront Panel PCB is usually resolved by
replacing the Main PCB Assembly
1. Follow steps 1 through 3 of the DISASSEMBLY (Lower Case)
section.
2. Remove the six (6) 7/64" allen screws (#49) from the Front
Panel bezel. Gently separate the bezel from the main ventilator
housing.
3. Disconnect two (2) connectors (JP1 & JP2) from the Front
Panel PCB.
4. Disconnect all electrical connectors from the Main PCB.
5. Remove the four (4) Philips head screws (#58) securing the
RS232 connector (P1) and the two transistors (Q1 & Q9) to left
hand side of the ventilator housing.
6. Remove the three (3) #10 torx screws (#52 & 61) securing the
Main PCB’s mounting hardware to the ventilator housing.
7. Disconnect the two (2) silicone tubes (#39 & 40) from the
transducers mounted to the Main PCB, marking them to avoid
incorrect reattachment.
8. Remove defective Main PCB. Transfer the mounting hardware
as necessary to the new PCB.
9. Reverse steps 1 through 7 to install the new Main PCB and
reassemble.
NOTE: The small white insulator should be inserted into the
transistor hole. Gently tighten the scre
ws making sure not to pinch
the insulator.
NOTE: Make certain that the insulator and the insulating bushing
are proper
ly placed.
ELECTRONIC & PNEUMATIC COMPONENT REMOVAL & REPLACEMENT
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