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hatstand.demon.co.uk!aaron
Newsgroups: rec.games.video.arcade.collecting
From: aaron@hatstand.demon.co.uk (Aaron Liddiment)
References: <3dsu5p$p3c@nyx.cs.du.edu>
Organization: Very Silly Party
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Subject: Re: DEFENDER diags help needed
X-Posting-Host: hatstand.demon.co.uk
Date: Tue, 3 Jan 1995 00:01:01 +0000
Message-ID: <9404052046.AA0005q@hatstand.demon.co.uk>
Sender: usenet@demon.co.uk
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David Fish (dfish@nyx.cs.du.edu) wrote:
: The self test tells me that there is a failure and the four led's on the
: ROM board display as shown below. My question is - what does it mean?
: I'm guessing that it signifies a RAM error. Anyone know?
Here are the self test extracts from the Defender booklet:-
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.
I hope these help you find your problem :-)
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