CMOS RAM DIAGNOSTICS – TEST 3
From RAM Diagnostics depress ADVANCE in AUTO-UP.
RESULT
CRT
INDICATION
LED INDICATION
FAULTY AREA
PASS
CMOS RAM TEST
PASSED
¡¡
l
¡
3
rd
LED blinks
twice.
-
FAIL
CMOS RAM
FAILURE
¡¡
l
¡
3
rd
LED lights.
CMOS RAM 1E memory
protect gates 4J, 6H, or
address decoder 4K, 5P.
CMOS
INTERLOCK
FAILURE
¡¡
l
¡
3
rd
LED lights.
Coin door interlock,
Memory protect gates 5B,
6H,4J, OR CMOS RAM 1E
COLOUR RAM TEST – TEST 4
From CMOS RAM test depress ADVANCE in AUTO-UP.
FAULT
COLOUR
SEQUENCES
RAM 2C
RAM 1C
1 LIGHT RED
2 RED
3 DARK RED
Band of red
intensity variance
or washout
Band of magenta
4 LIGHT GREEN
5 GREEN
6 DARK GREEN
Band of yellow
Band of cyan
7 LIGHT BLUE
8 BLUE
9 DARK BLUE
Band of magenta
Band of blue
intensity variance
or washout
4 LIGHT GREEN
Band of green
Band of dark green
or washout
5 GREEN
Band of light green
Band of faint
green, Band of
darker green
6 DARK GREEN
Band of washout
CRT SEQUENCES THROUGH 8
COLOURS, 2 SECONDS EACH
VERTICAL BAND INDICATES
COLOUR RAM FAULT.
¡¡¡
l
4
TH
LED REMAINS LIT
DURING TEST
Note that a blank sequence or two sequences with same
shade indicate 2C or 1C RAM or color analogue circuit
faulty.
Tests 5 and 7 provide sequential subtests. To stop automatic cycling set switch to
MANUAL/DOWN. Depress ADVANCE in MANUAL-DOWN to step through subtests.
SOUND TEST – TEST 5
From Color RAM test, depress ADVANCE in AUTO-UP.
Test sequences sounds 1 through 31, skipping 19, 27, and 28.
Missing
Check
1
2P4/10P3 Pin 3
2
2P4/lOP3 Pin 2
4
2P4/10P3 Pin 5
8
2P4/10P3 Pin 4
16
2P4/10P3 Pin 7
All
Perform Sound Board Diagnostics
