5-22 MAC™ 3500 Resting ECG Analysis System Revision L
2021337-036
Maintenance: Main CPU Board Replacement
Main CPU Board Replacement
Removal of CPU Board
NOTE
Before you begin, save the current System
Setups to an SD card and print
System Setup report. This will be used to restore the system setups after
replacement of the CPU board.
1. Remove the battery. See “Battery Replacement” o
n page 5-6.
2. Remove the top cover. See
“Keyboard/Top Cover Assembly Removal &
Reassembly” on page 5-14.
3. Remove COMM board. See “COMM Board Replacement” on page 5-30.
4. Pull up on the brown ribbon cable to disconnect it from the main CPU board.
5. Remove the three fasteners holding the
acquisition board to the acquisition
board bracket and rem
ove the acquisition board.
6. Remove the four Torx fasteners holding th
e acquisition board mount in place
an
d remove the acquisition board mount.
7. Remove the two grounding straps by removing the fasteners holding them to
the
standoffs.
8. Using a 5.5mm socket wrench or small pliers, carefully remove the two ground
standoffs.
9. Disconnect the battery cable (J2),
the power cable (J11), and the printhead
cable (J12) fro
m the main CPU board.
10. Remove the nine Torx fasteners
holding the CPU board in place.
11. Lift the board off the lower frame.
Two 5.5mm
standoffs
(grounding
straps)
Nine Torx
fasteners
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