Tektronix TCPA300 SERIES, Instruction Manual

Page: 166 / 205

Disassembly
7- 8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
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 circuit 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. See
Figure 7--5.
3 heat sink clips
J2 connector
J3 connector
J4 connector
Lift up the tab to
remove the ribbon
cable
Figure 7- 5: Removing the three heat sink clips
7. Disconnect the front-panel ribbon connector from J4 on the amplifier board.
Be 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 connector. See Figure 7--5.