Star Tech Journal

14
STAR•TECH JOURNAL/JUNE 1982
TAITO
"GRAND CHAMPION"
COIN AND RESET MODS
Problem: Coin Not Always Registers
Solution: Change value of capacitors for better reaction.
Parts Needed: Two luf capacitors.
Procedure:Replace C83 and C84 with luf capacitor (refer
to figure 1 ).
G
0 0 0 0
---c:J- C)
---re••
----[=:}-
.....
Figure 1
(,J
~ o~----C83
----c:=J-
.....
~
.....
.....
01
(J)
Problem: Intermittent Reset
Solution: Add pull-up resistor and filter cap.
Parts Needed: One 47 ohm resistor and one .01 uF capacitor.
Procedure: Cut etch coming from IC 16 E
pin 1 (refer to figure 2). Add a 47-ohm
resistor between pin 1 and the feed
through (refer to figure 2). Add the .01 uF
capacitor between the feed through and
ground.
Q-45
OLD
S-20
6
3
16F
74LS393
POWER ON RESET
RESET
74LS02
:..J
Figure 2
◊
NEW
6
E~
Q-45
p 74LS393
S-20
3
RESET
7402
F~
16F
16F
74LS393
POWER ON RESET--=----'
0
+-103
rI
p 15F
74LS04