This target model has one acoustic sensor in each corner. There's also a temperature sensor in the upper right corner and one at the bottom of target.
Cables leading to/from these sensors are pulled in cable tracks at the outside of the target frame (right and left side), kept in place by a few staples.
The acoustic sensor placements are called A1, A2, A3 and A4, as shown at illustration below. Target seen from the front side (facing firing line).
The upper right temperature sensor is called T2.
The sensor cables are attached to the target electronics in the bottom of the target. They are attached to teminal blocks marked accordingly (A1 - A4, and T2).
As for the acoustic sensors, red wire is connected to point 1, black to point 2, and unisolated wire to point 3 - for each terminal block.
The temperature sensor cable is connected to T2: White wire to point 1, black wire to point 2, and unisolated wire to point 3.
Error indications at target electronics
The eScore system will post warnings at system level if a sensor cable is completely cut or short circuited. Still, there's a few error indicator LED's at the target electronics that will illuminate red in these occurances. These LED's are called A1, A2, A3, A4, T1 and T2, according to the sensors mentioned above.
Damages undetected by error indicator LED's
If the sensor itself, not the cable, is damaged (hit or near hit by a stray bullet) - these warning LED's will most likely not illuminate. In these situations, the eScore system will post warnings at system level which sensor is not responding, when firing at the target.
Replace acoustic sensor
Sensors, with cable, is replaced by detatching them from target electronics and target frame. In this event, upper corner of target rubber skin (one side) need to be detached from target frame (say 50cm in each direction). Staples need to be removed, as well as cable ties, cable clips and sensor screws. Please note where the cable is monted to the target, all the way to the target electronics (helps when re-installing).
New sensor is screwed at same place as the prior one. The corner brick, of which the sensor is attached, has a center mark. This mark should correspond to the center of the black sensor head. Shift position of the sensor assembly, until they correspond. Then tighten the screws.
Pull sensor cable through target frame, down target side, and then back into the target at bottom of target. Attach sensor cable as prior cable was attached.
Give the sensor some slack
If cable to sensor board is pulled tight, the sensor will eventually pull loose from the attached foamtape. It is therefore WERY important that the wires going to the sensor, get some slack. Tis is why the sensor cable is attached to the corner brick with a cable clip. See image above.
Elsewhere, the cable can be pulled tight.
Cut the sensor cable to desired length and pick off 3cm of the outer cjacket. Remove 4-5mm of leader insulation, before attaching them to the target electronics as described above. Cables from left side of target are usually put in a small loop, to gain some extra length for potential cable splicing.
Be careful with the acoustic sensors
The acoustic sensors may break if subjected to shock (dropped). Handle them with caution.
Replace temperature sensor cable (T2)
Sensors, with cable, is replaced by detatching them from target electronics and target frame. In this event, upper right corner of target rubber skin (at one side) need to be detached from target frame (say 50cm in each direction). Staples need to be removed, as well as cable ties and cable clips. Please note where the cable is monted to the target, all the way to the target electronics (helps when re-installing).
Pull sensor cable through target frame, down target side, and then back into the target at bottom of target. Attach sensor cable as prior cable was attached.
Cut the sensor cable to desired length and pick off 3cm of the outer cjacket. Remove 4-5mm of leader insulation, before attaching them to the target electronics. The temperature sensor cable is connected to T2 at target electronics: White wire to point 1, black wire to point 2, and unisolated wire to point 3.
Splice sensor cable
It is possible to splice damaged sensor cables.
The sensor cable is put in a small loop next to the target electronics, to enable pull-back when splicing. In this respect staples, cable ties and cable clips may need to be cut or loosened.
Splicing may be done by butt splice connectors and suitable crimp tool, or it can be done by soldering. It is strongly recommended to insulate splices from water penetration.
Long term fix
Splicing is fine as for a rapid and short term solution. It is though recommended to replace sensor (incl cable) for a long term solution.