Defender RAM Failure help
Kenneth Murphy
Initial Tests Indicate
RAM Failure
leds: 0101
Stepping thru RAM tests:
Ram Failure
RAM 36
leds: 1000
Also:
Vertical color bars indicate
Color RAM Failure
leds: 0001
The game resets every 20 seconds or so...
I'm not sure how to read the leds vs. the RAM 36 indication.
Which RAM is this telling me to replace? The docs are below.
Thanks for your help...........KM
POWER-UP AND RAM/ROM TESTS
==========================
Test initiated at power turn-on and after depressing RESET pushbutton on
CPU/VIDEO board.
RESULT CRT INDICATION LED INDICATION
-----------------------------------------------------
Pass INITIAL TESTS OK 4 LEDs blink twice
Fail Ram RAM TEST FAILED X--X (LEDs 1 & 4 light)
Fail Rom ROM TEST FAILED None
In either of the above two 'Fail' situations you should depress ADVANCE
in MANUAL-DOWN while the failure message is displayed to enter
Diagnostics.
ROM DIAGNOSTICS - TEST 1
========================
From game over, depress ADVANCE in MANUAL-DOWN.
RESULT CRT INDICATION LED INDICATION CORRECTIVE ACTION
-----------------------------------------------------------------
PASS ALL ROMS OK X--- n/a
LED 1 blinks twice
-----------------------------------------------------------------
FAIL ROM TEST FAILED X--- Replace ICX on ROM board
X LED 1 lights or depress ADVANCE in
(X = 1 to 12) MANUAL-DOWN.
Chip indicated: Replace:
---X IC1
--X- IC2
--XX IC3
-X-- IC4
-X-X IC5
-XX- IC6
-XXX IC7
X--- IC8
X--X IC9
X-X- IC10
X-XX IC11
XX-- IC12
RAM DIAGNOSTICS - TEST 2
========================
From ROM diagnostics depress ADVANCE in AUTO-UP.
RESULT CRT INDICATION LED INDICATION CORRECTIVE ACTION
-----------------------------------------------------------------------
TESTING Random Pattern n/a Depress ADVANCE in AUTO
to bypass test
-----------------------------------------------------------------------
PASS ALL RAMS OK -X-- n/a
LED 2 blinks twice
-----------------------------------------------------------------------
FAIL RAM FAILURE -X-- Replace RAM (see below)
XY LED 2 Lights or depress ADVANCE in
X=Bank No. MANUAL-DOWN
Y=Chip No. --------------------------------------------
Bank indicated: Depress ADVANCE in
X--- = 1 MANUAL-DOWN
-X-- = 2
--X- = 3
--------------------------------------------
Replace in Bank:
Chip indicated: 1 2 3
---X = 1 4L 5L 6L
--X- = 2 4M 5M 6M
--XX = 3 4N 5N 6N
-X-- = 4 4O 5O 6O
-X-X = 5 4P 5P 6P
-XX- = 6 4Q 5Q 6Q
-XXX = 7 4R 5R 6R
X--- = 8 4S 5S 6S
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 --X- n/a
LED 3 blinks twice
-------------------------------------------------------------------------
FAIL CMOS RAM FAILURE --X- CMOS RAM 1I,
LED 3 lights memory protect gates
2H, 1K or address
decoder 2F, 4E.
----------------------------------------------------------------
CMOS INTERLOCK FAIL --X- Coin door interlock,
LED 3 Lights memory protect gates
1J, 1K, 2H or CMOS
RAM 1I.
Kenneth Murphy
I still get the Color RAM Failure message in the diagnostics...
Where is the color ram?
Thanks.........KM
Kirk S.
The computer cannot test the Color RAM. The message indicates that if you
see dark and/or off color vertical bars, the the Color RAM is bad...
Kirk S.
"Kenneth Murphy" <a@b.c> wrote in message
news:L1Tvd.656530$mD.595309@attbi_s02...
Kenneth Murphy
Thanks.........KM
"Kirk S." <cray...@yahoo.com> wrote in message
news:OoGwd.129007$ye4.1...@twister.rdc-kc.rr.com...