DIGITAL DISPLAY TEST
Digital display utilizes an intelligent Dot Matrix Display Board. Thè purpose behlnd thls board Is to provlde more
Information to thè operator as well as displaylng graphics to thè player.
Thè board is controlled by a Z80A microprocessor and it’s personality ROM . (Unique to thè Game). It receives
Data, Reset & Clock information from thè CPU Board via thè ribbon cable
and sends back Status and Busy slgnals
to thè CPU. This is to insure syncronized communication of both boards.
Thè Drivers for thè rows and columns are provided on 3 surface mounted integrated circuits. U13 & U14 supply
thè anode power to thè columns and U15 supplies thè cathode power to thè rows.
Automatic Test
To enter Display tests, operate thè STEP push-
button switch from thè Sound Manual test. Thè displays will first
illuminate all dots in thè entire Display. After a slight delay it will cycle one
column from left to rlght. After a period
of time, it will begin thè Row test by lighting thè top row of thè display, then turning it off and iluminating thè next
row, until each row has been has been indivudally lit, while thè other rows are off. Thè next
other dot lit, in both thè rows and columns. These dots then go out, and thè unlit dots light, resulting in an alternatlng
checkerboard pattern. Thè test concludes with thè words "DOT MATRIX LIVES". ( Please Note-
interrupted at any time by operating thè STEP push-button switch to advance to thè next test.
Museum Motor Test
Thls Game has a feature which lowers a Target Switch (Museum) to allow a shot to thè VUK below thè playfield.
Thè motor on this mechanism Is co
ntrolled by a relay driven by Q23 on thè CPU and there are 2 Limit switches (
Museum motor Up & Museum Motor Down) used by thè CPU to determine thè status of thè Museum Motor.
After entering this test, press and hold thè game’s Start Button. This will caus
e thè relay to pulse repeatedly as long
as thè Button is depressed. At thè same time you will notice that thè switch status (ON & OFF) will be indicated In
both thè upper and lower portions of thè display (Museum motor Up & Museum Motor Down). Thè appropri
switch should be closed just prior to thè limit of thè Museum Motor Mechanism and both switches should not be
closed (ON) at thè same time.
This test Is located before thè Switch Tests so thè technician can move thè mechanism until both switches read
OFF. This will help eliminate erronious readings while trying to trace a problem during Active Switch Test.
Game Diagnostics
23
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