Atari 2600 Field Service Manual

Trigger Line Troubleshooting Procedure
.I Yes
I
I
C
1s +Sv at A203
Repair
open trace from:
No
R225 to A203
Is trigger Line
pin 7 (right
(right) - now operating
trigger) and pin 9
-
R226 to A203 properly?
(left trigger)
(left)
* A i
I
) Yes
A I 1
1
-
I
Yes
-
A A 1
L trigger Line
now operatins
correctly?
I
Check/Rtpair
C236,CRZOZ
(left)
C237,CR203
(right)
-
Check/repair trace lines
from:
R225 to 3203, pin 6
(right), R226 to 3202,
pin 6 (left).
b
ls +5v at pin 6
of 3203 (right)
trigger) or
1202
(left trigger)?
t
b 4.5-5v at
L 9
A203 pin 6 Swapout A203. -
(right) and No
I
Does trigger line
now WQd pmperly?
2600/2600A Domestic VCS
No -
J
Is trigger line
nor operating
cofrectly ?
Yes
'
L
3
Check for VMOD
(+Sv) at top of
R225 (right) or
R226 (left)
in 10 (left)?
-
I
Yes
L
Swapout A201
I
I
Docs trigger Yes
line now work I
swapout
I) A200
2) A202
4 I
I

Atari 2600 Specifications

General

Manufacturer	Atari, Inc.
Release Date	September 11, 1977
CPU	MOS Technology 6507
CPU Speed	1.19 MHz
RAM	128 bytes
Graphics	Television Interface Adaptor (TIA)
Media	ROM cartridge
Successor	Atari 5200
Colors	128
Sound	2 channels
ROM	4 KB
Controller Input	Joystick