Barcrest MPU6, Руководство по обслуживанию на месте

Страница: 52 / 93

52
4.9.7 Photo components
The marker pulse received by the REEL5 control board from each photocell is processed by
the on-board single chip processor (CPU), which uses a counter to keep track of the reel
position referenced to the pulse.
The illuminating LED’s are sourced across the 12V supply through series resistors mounted
on the photoboard and are driven by buffered signals from the CPU.
The light from the LED’s is infrared and is not visible to the human eye. When the Self-Test
mode is entered the reels spin and index to the start of the reel band, and the obstruction of
the photo electrics by the flag is indicated by back illumination of the first symbol.
Correct functioning can be verified by manually adjusting the reel position and observing the
points of operation.
The components are mounted on a photoboard contained in a plastic moulding, which is
fixed to the frame by clicking into a recess. Electrical connection to the opto is by means of a
3-way I.D.C. connector.
4.9.8 Symbol illumination
MPU5 reel assemblies have the ability to back-illuminate the symbols independently on,
above, and below the payline. This is achieved by three or more lamps (six lamps for wide
reels) mounted within a lightbox and located within the translucent reel drum.
4.9.9 Gamesman assembly
The moulded plastic lightbox slides in a channel round the circumference of the frame. The
channel is marked with a scale to allow calibrated adjustment over an arc of 180º so that the
reel assembly can easily be fitted to front or rear door machines.
A countersunk cross head screw locks the lightbox in the required position. The lamps are
connected via the 14-way frame connector and a blue 4-way I.D.C. connector to the REEL5
control board.
4.9.10 Reel bands
Reel bands for the MPU6 may have 12, 16 or 24 symbols and may be of a wide or narrow
type. The required number of “stops” is determined by the MPU6 program and makes no
difference to the rest of the reel assembly.
The reel bands, which are of the wider type, can only be fitted on reel assemblies that have
larger spacers fitted or on reel assemblies manufactured to take the wider reels.