TMS STRING PINSPOTTER OWNER’S MANUAL
400-051-010-01 Rev. Date: 7/17 Page 2-9
Adjustment Procedures
Procedure 2-1, Ball Detector Alignment:
The ball detector is a simple, very reliable stand-alone device, but it may become
misaligned once-in-a-while due to the constant vibration caused by bowling balls rolling
down the lane and pin action against the kickbacks. Located in front of the kickback, it
communicates with the pinspotter control chassis via a cable.
Ball detectors use a very simple principle. An invisible beam of light is constantly
emitted from the ball detector. A reflector placed on the opposite side of the lane returns
the light beam to the unit, which also contains a sensor. When the signal is interrupted by
a ball passing through the beam, the ball detector communicates this information to the
pinspotter control chassis. This action starts the pin-fall reading period followed by the
appropriate pinspotter cycle, which depends on what ball (first or second) of the frame it
is and whether or not pins remain standing.
Each ball detector has a combination emitter/detector mounted in a housing that
simplifies the adjustment of the unit. The unit contains an LED on the tail end that is ON
when no return signal is being detected and is OFF when a return signal is detected. If
the LED is ON, a few things are possible: The ball detector is completely misaligned, the
beam is blocked, the emitter/sensor is very dirty, or the unit is defective. The unit is held
rigidly by its support housing and can be adjusted as follows:
CAUTION: Ensure that no one is preparing to bowl before stepping onto the lane.
Employ a barricade to bowlers or physically prevent the possibility of bowling during any
maintenance operation.
1. Loosen the screws that secure the cover to the assembly at the front of the unit, and
remove the cover.
2. Loosen the four (4) small flathead screws that secure the top half of the sensor
housing just enough to allow the sensor to be adjusted.
3. Adjust the detector as necessary so that the beam is reflected back and detected as
indicated by the LED on the tail end of the sensor going out.
4. Once the light is out, tighten the four screws.
5. Lay a sheet of black construction paper on the lane where the ball detector is located
and slide it from gutter to gutter. The light should stay off. If the light comes on, this
means that the signal is bouncing off the lane instead of being just above the lane.
Repeat steps 2, 3, & 4 angling the ball detector up, and then repeat step 5.
6. Reinstall the detector assembly cover.
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