Disassembly
Replacing the Circuit
Board or Cable Assembly
Replace the cir
cuit board or cable assembly of the probe as follows:
1. Remove the current transformer using this procedure. (See page 75, Replacing
the Current Tr
ansformer.)
2. Lift the plastic cable housing from the probe body half as shown.
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.
Figure 33: Removing the circuit board and cable assembly
5. If you need to replace the cable, separate the cable and c ircuit board by
unsoldering the cable ground wire and disconnecting the cable connector
from t
he circuit board.
6. If you need to replace the circuit board, do step 5, and then unsolder the
grou
nd wire from the circuit board to the p robe 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. (See page 73, TCP305 and TCP312.)
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.
76 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual
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