Chapter 4. Maintenance, Troubleshooting & Wiring
4-5
Testing Gantry Optos
[ ] 1.
Test opto switches of interest with your fingers: You can remove or add balls to the
trolley (ball server). Or you can put your fingers in the trolley and cause optos to
change states. When the state changes, a red bar displays at the top of the screen,
indicating an open switch
(normal).
No change in state, or a missing bar means that
something is wrong with the switch. For example, the opto receiver (transistor)
might be dirty, or the LED might have failed.
[ ] 2.
Service optos as necessary. For example, replace suspect or bad boards and retest
the trolley with the new opto.
Reassembly
[ ] 1.
Ease the speaker panel toward the cabinet.
[ ] 2.
This step requires a T15 tamper-proof Torx
driver. Fasten the speaker panel with
the two screws that you removed during disassembly.
Clean the LCD and Playfield
You’ll Need These Tools
[ ] 2.
Microfiber towels
● Cleaning solution (See
Cleaning
,
below)
•
T15 tamper-proof Torx
driver
● 7/16 socket or hand driver
Disassembly
[ ] 1.
Switch off power to the game machine.
[ ] 2.
This step requires a T15 tamper-proof Torx
driver. Remove the top two screws
from the LCD cabinet.
CAUTION
Playfield surface.
The playfield surface is a soft plastic. A mild cleaner is necessary. Use
of abrasives will scratch this plastic surface. Abrasives can also pit the glass monitor
screen.
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