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SECTION 5
BUILT IN DIAGNOSTICS
The built in diagnostics were designed for ease of opera-
tion and thoroughness.
The diagnostics have been
organized in such a way as to allow individual testing of
different areas in the machine. These areas include:
a) CPU Board Self-Test
b) Game Status change
c) Display digits test"
d) Lamps (test 01)
e) Solenoids (test 02)
f) Switches (test 03)
g) Game status display (test 04)'"
"'There are specific subtests in these tests. The different
ways to enter the diagnostics and normal game operation
are shown in Figure 6. There is also an auto cycle test
which will be discussed later.
DIAGNOSTIC SWITCHES
There are three switches which are used to control the
operation of the diagnostics:
1. Diagnostic switch (lower pushbutton on CPU)
2. Auto/Manual (inside coin door)
3. Advance switch (inside coin door)
Pressing the Diagnostic switch on the CPU Board initiates
the diagnostics and causes the CPU to perform three self
tests automatically:
1. ROM/PROM test
2. RAM test
3. CMOS RAM test
If any errors are detected, the two LEOs on the CPU
Board will light to indicate the specific failure. If all three
tests pass successfully, the two LEOs will blink twice and
then go off. The diagnostics will then be in GAME
STATUS CHANGE.
SOUND BOARD DIAGNOSTICS
Unlike previous solid state games, DISCO FEVER has no
sound board diagnostics. Switch SWI on the board is not
operational. Refer to Section 6J for troubleshooting the
sound board.
CPU BOARD SELF TESTS
ROM/PROM TEST
The ROM/PROM test specifically checks the contents of
CPU Board IC 17, IC 20, IC 21, IC 22 to see if the infor-
mation in the ROM's and the field PROMS is correct. If
the information is incorrect, the bottom LED will light up
and the top LED will be OFF on the CPU Board.
OFF
0
ROM/PROM failure
ON -~
."..,
NOTE: Different wiring is used in production games ver-
sus prototype games. When replacing PROMS or
the CPU Board in DISCO FEVER games, refer to
special procedures at the end of this section.
16
RAM TEST
The RAM test specifically checks the ability of the RAM
IC's 13 and IC 16 to retain information correctly. If the
information is not retained correctly, the CPU Board top
LED will light up and the bottom LED will be OFF.
ON ~-
RAM failure
OFF
0
CMOS RAM TEST
The CMOS RAM test specifically checks the operation of
PIA 1
uc
18) and the ability of the CMOS RAM IC 19 to
retain information correctly. If IC 18 is faulty or the infor-
mation is not retained correctly, both LEOs will light up
and stay ON on the CPU Board.
,
ON ~-
CMOS RAM failure
ON",-
• I '
GAME STATUS CHANGE
Following the successful completion of the CPU Board
self tests, the two LEOs blink twice and the diagnostic
program enters the game status change area. This is the
only time that changes can be entered as outlined in Sec-
tion 3 of this manual. Replay points, maximum credits,
match features, etc. can be changed ONLY during this
portion of the diagnostics. Any changes made to the data
will not be displayed until the game status display (test
04) described later. After making all game status changes
(if any), press the ADVANCE pushbutton once to go to
the digits test.
NOTE: This section of the diagnostic is the only section
where ALL player and master display digits are
turned OFF. No digits show on the displays un~l
the next section of the diagnostics is entered by
pressing the ADVANCE pushbutton on the coin
door.
DISPLAY DIGITS TEST
This test is controlled by the two switches mounted onthe
coin door. If the AUTO/MANUAL switch is in the
AUTO position, the digits on the display will alternate
from 0 to 1 etc. to 9 and back to 0, 1, etc. This will con-
tinue until the ADVANCE pushbutton is pressed.
If the AUTO/MANUAL switch is in the MANUAL posi-
tion when entering the test, the digit displays will show all
zeros and will remain at zero until the ADVANCE is
pressed. This will change all the displays to all 1'so Press-
ing ADVANCE again will change the display to all 2's etc.
Each time the ADVANCE pushbutton is pressed the
digits will change. Returning the AUTO/MANUAL
switch to the AUTO position will cause the digits to start
cycling automatically. To regain manual control, place the
AUTO/MANUAL switch to the MANUAL position and
press the ADVANCE pushbutton. To exit this test and
proceed to the LAMP Test (Test 01), place the AUTO/
MANUAL switch to the AUTO position and press the
ADV ANCE pushbutton once. All the displays will clear.
The match digits will display 01 to indicate test 01 and the
diagnostic will go to the lamp test.