help w/Defender
Ray Ghanbari
In article <4t853u$n...@daffy.anetsrvcs.uwrf.edu> Kinn...@pressenter.com
(Kinninet) writes:
> I have recently acquired a standup Defender.
>
> It fires up but initial tests indicate ram failure.
>
> Does anyone know how to remedy this?
>
> I have the schematics for it but need help.
>
> Ben
Check out Tim Foley's WONDERFUL Defender site:
http://www.interlog.com/~timf/defender_page/defender.htm
There you will find the following (originally posted by
aa...@hatstand.demon.co.uk (Aaron Liddiment)):
****************
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.
*********************************
Anyway, once you replace the bad chip, make sure that you disconnect the
harness from the powersupply at the base of the cabinet and check all the
voltage levels. 4116 chips use 3 different voltages to run, and the
Williams supplies are notorious for going bad and wiping out entire banks
of RAM
Also, you should seriously consider replacing the Williams power supply
with a modern switching supply. Only hard part is figuring out what to do
with the -12V line. Since it is only used by the sound board, I wired it
up to -5V. You can't crank the volume as high, but it can still get
plenty loud ;-)
--
Ray Ghanbari
Mayo Foundation
r...@mayo.edu
Kinninet
Kinninet
Ok now we looked inside,
No led lights indicating what problem.
It appears that rom ic5 is missing (if there is one)
Blank scrolling screen.
Also, no led light for +12v
should there also be fuses in what appears to be fuse holders in cpu
board (lower right?)
Thanks
Bob Poniatowski
Hi,
I've got a Galaxian that has a coin door just begging for a new coat of
paint (it's a rusty, ugly thing now)...
Anybody ever tried taking coin door hinges apart? Is this difficult?
It would make painting a bit easier I'd think!
Thanks!
Bob Pony
Ray Ghanbari
In article <4tdkiv$b...@daffy.anetsrvcs.uwrf.edu> Kinn...@pressenter.com
> It appears that rom ic5 is missing (if there is one)
This is normal
> Blank scrolling screen.
>
> Also, no led light for +12v
12V is required for the 4116 RAM chips to work. The lack of it will kill
the whole machine. Rather than trying to fix your power supply, I
strongly suggest you take this opportunity to replace the standard
Defender supply with a modern switching supply. Just wire the -12V line
to -5V on the switching supply.
Anyway, chances are that once you get 12V, you'll find that some number of
the RAM chips are burned out (this is why a stable powersupply is so
important for these old Williams games). The LEDs on the cpu board will
help you track them down
The plus side is that Williams games are usually the best buy of the
auction when they are in the dead row. 8 times out of 10, the power
supply had a hic up and fried a RAM chip. The other 2 out of 10, the
power supply went nuts and sent ~+20V (or whatever) down the 5V line,
causing some other problems. Hopefully yours is OK
(As an aside, I ALWAYS pull the power harness connector from the PS and
check the voltages before risking turning on any new Williams cabinet I
have. Who knows if the power supply is good or not, so better safe than
sorry)
> should there also be fuses in what appears to be fuse holders in cpu
> board (lower right?)
Actually, they hold 3 AA batteries to maintain machine options and high
scores. If you're really annal, move the batteries off of the cpu board
and bring the wires in (battery corrosion is a nasty thing) If you're
annal and motivated, check out the schematics and hack in a NVRAM chip to
eliminate the need for battery backup