Tektronix TCPA300 SERIES, Instruction Manual

Page: 175 / 205

Disassembly
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7- 17
Replace the circuit board or cable assembly of the probe as follows:
1. Remove the current transformer using the procedure on page 7--16.
2. Lift the plastic cable housing from the probe body half. See Figure 7--14.
3. Unsolder the probe body connection on the circuit board. Be careful not to
damage the circuit board.
4. Lift the cable and the circuit board from the probe body half.
Unsolder probe
body connection
Circuit board
Lift plastic cable
housing
Figure 7- 14: Removing the circuit board and cable assembly
5. If you need to replace the cable, separate the cable and circuit board by
unsoldering the cable ground wire and disconnecting the cable connector
from the circuit board.
6. If you need to replace the circuit board, do step 5, and then unsolder the
ground wire from the circuit board to the probe body half.
7. Before reassembling the probe, be sure that the gap between the stationary
and moveable core pieces is clean. If necessary, use isopropyl alcohol or a
similar cleaning agent to clean the pieces. Also, clean the contacts of the
slide switch, if necessary. Should the plastic slide assembly require
lubrication, sparingly apply silicone-based grease to the parts.
8. Probe reassembly is the reverse of steps 1 through 6 of this procedure and
steps 1 through 5 on pages 7--14 through 7--15.
CAUTION.
To avoid damaging the wires inside the probe, carefully dress the
wires in the lower body half to avoid contact with the slide assembly. Exercise
care when fitting the slide back into the probe body; aligning the switch contacts
can require patience.
Replacing the Circuit
Board or Cable Assembly