Disassembly
Replacing the
Amplifier Board
If you need to replace the amplifier board, you must detach the rear- and front-
panel assemblies of the amplifier from the chassis.
1. Wear an antistatic wriststrap when handling the circ uit assemblies.
2. Remove the 2 Phillips screws that attach the AC power connector to the rear
panel.
3. Gently pull back the rear panel enough to allow clearance for the amplifier
board.
4. Disconnect the DC power supply connector from J3 on the amplifier board.
5. Disconnect the fan connector from J2 on the amplifier board.
6. Using pliers, remove the three heat sink clips from U9, Q18, and Q21 as
shown.
Figure 24: Removing the three heat sink clips
7. Disconnect the front-panel ribbon connector from J4 on the amplifier board.
B
e sure to carefully release the tab on the connector before removing the
ribbon cable from the connector. Only lift the ends of the tab to release it
from the c onnector. (See Figure 24.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual 67
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