S*TJ DECEMBER 1981 13
TAITO
"QIX"
* SERVICE * NOTES
Subject:
Subject:
Subject:
Game Powers Up But Will Not
Coin Up. Battery Is Too Low.
lntermittant Lock Up, Data/
Sound Board
CMOS Failure
Solution:
Solution:
Reset CMOS RAM. It Should
Be Noted That All Audit
Totals Will Be Wiped Out.
Tie NMI & IRQ Together
Improve Power Circuit CMOS
Ram
Procedure:
Open Back Door, Pull Wl out
on Video Board (Blue Jumper).
Wait 2 minutes, Power back on
and insert Wl back in. If
Language Select Frame does
not come on CRT, Power
Down, remove Wl again,
Short Pins 18 and 9 on U85.
Power Back on and insert W 1
back in.
Leave Game on for 12 hours.
If this procedure does not work
when you turn it back on,
replace Battery.
Solution:
Procedure:
Parts Needed:
On the Etch Side of the Data/
Sound Board, cut three traces.
Trace from U2 Pin2, U2 Pin3,
and cut the Trace J 6 Pin 16 to
the Feed Through.
Add a Jumper Wire from U2
Pin3 to the Feed Through that
was connected to J 6 Pin16.
One 150 OHM Resistor
One 390 OHM Resistor
One 10/ 16V Capacitor
Procedure:
Replace R65 with a 150 OHM
Resistor. Replace R61 with a 390
OHM Resistor. Add a 10/16V
Capacitor across ClOl observ-
ing polarity.
To measure the Charge
Current, take Wl (the Blue
Jumper next to the Battery)
out. Put an Amp Meter across
the two Pins. You should read
5MIL to lOMIL AMPS. Turn
off Machine and you should
read 200M AMPS to 400M
AMPS.
MIDWAY
"OM EGA RACE"
* ROM/RAM * CH ECK LIST
ROM/RAM CHECK LIST AND MOTHER BOARD
LOCATION COORDINATES
*
p
p
p
ROM 1
ROM 2
ROM3
ROM 4
OK-M-7
OK-L-7
OK-K-7
OK-J-7
p
p
p
RAM 1
RAM2
RAM3
OK-S-3 and/or S-2
OK-R-3 and/or (R/S)-2
OK-P-3 and/or (P/R)-2
BBU
RAM
OK-S-4
V
V
V
RAM 1
RAM2
RAM3
RAM4
OK-H-1 and/or (M/N)-1
OK-J-1 and/or (UM)-1
OK-L-1 and/or (K/L)-1
OK-(J/K)-1 and/or (N/P)-1
V
V
ROM 1
ROM2
OK-E-1
OK-F-1
p
** V
• If completely bad , no pi cture and no " BEEP" sound .
• * If completely bad , no picture.
For instance: if the 7th and the 12th chips down
from the top are found to be bad, they would look
like this (P RAM 3 NG) and (V RAM 4 NG).
In the above case, the "BEEPING" sequence
would be as follows:
7 ''BEEPS'',
PAUSE (2 to 5 seconds),
THEN 12 MORE "BEEPS",
LONGER PAUSE (10 TO 15 SECONDS),
THEN REPEATS ABOVE SEQUENCE.
NOTE: In addition to the "BEEPING", the game
will also flash its 1 and 2 credit LED lit
push buttons at you in sequence with the
"BEEPS" -7 "BEEPS", 7 "FLASHES"-
12 more "FLASHES" - and so on.
These "BEEPING" and "FLASHING"
sequences are repeated until the game is turned
off and the bad chip(s) are replaced or until the
Self-Test switch is turned off.