List of Tables

Table 4-1
~iile Connected Pins on VCS Motherboard

2600/2600A Domestic

INTRODUCTION
The Video Computer systemT' sections:
(VCS) Field Service Manual is organized in nine
THEORY OF OPERATION basic assemblies look like.

- overview of

how t h e VCS works and w h a t t h e
SILKSCREENS AND SCHEMATICS - e l e c t r i c a l drawings and layouts of t h e printed c i r c u i t boards.
TESTING AND TROUBLESHOOTING testing and repairing t h e VCS unit.
overview of t h e procedures for
2600 DIAGNOSTIC FLOWCHART - thorough flowchart enabling t h e technician t o test and troubleshoot a d e f e c t i v e 2600 unit.
SYMPTOM CHECKLIST - for the experienced technician, a list of t h e high failure parts and t h e flowchart entry point for t h a t particular problem.
DIAGNOSTIC FLOWCHART - thorough flowchart enabling t h e technician t o test and troubleshoot a d e f e c t i v e 2600A unit.

GAME CONTROLLERS

overview of hand controller construction with electrical schematics and recommended test and repair procedures.

PARTS LIST

- detailed breakdown
of all p a r t s used in both t h e 2600 and
SERVICE BULLETINS - section t o b e used t o hold service bulletins released
by the Manager of Technical Support. These bulletins will include c h a n g e s in recommended repair procedures and required modifications for units in t h e field.
T h e manual is designed for use by both experienced and inexperienced s e r v i c e personnel. The Diagnostic Flowcharts (Sections 4 and 6) provide detailed diagnostic and repair procedures for technicians who a r e not y e t completely familiar with t h e VCS. The Symptom Checklist (Section 5 ) provides a f a s t repair reference for t h e m o r e experienced technician.
2600/2600A Domestic V C S

SECTION 1

THEORY OF OPERATION
There a r e currently four types of ATARI Video Computer Systems. The original model (2600) is composed of two PC Boards connected by a 12-pin ribbon cable with t h e motherboard surrounded by a heavy aluminum casting.

A 15 MHz oscilloscope

A Video C o m p u t e r System switchboard assembly t h a t is known to be operating properly (not required for repairing 2600A units) A Video C o m p u t e r System diagnostic t e s t cartridge, version 2.6 (DTC)
Two blue controller port shorting plugs for use with t h e 2.6 (DTC) diagnostic c a r t r idge Signal T r a c i n s C a r t r idqe (STC o r KLUGE) VCS Field Service Manual for Domestic Model 2600/2600A Color television s e t (properly adjusted) Frequency Counter

2600/2600A Domesric VCS

TEST PROCEDURES AND METHODS
A t a r i requires e a c h 2600/2600A model returned for s e r v i c e t o b e checked for c e r t a i n conditions. In some instances, a unit must be modified t o c o n f o r m t o Atari standards. These changes a r e summarized below.

2600 MODEL MODIFICATIONS

Each 2600 model opened must be modified as shown in Figure 3-1 t o provide additional protection from s t a t i c discharge. A Zener diode is connected b e t w e e n t h e trigger lines and ground, and s t a t i c strips a r e placed on t h e s w i t c h e s on t h e switchboard (See Figures 3-1, 3-2 and 3-41. These modifications a r e c r u c i a l t o prevent c o m p o n e n t d a m a g e d u e t o s t a t i c discharge. Each c o n n e c t o r a n d plug should b e checked for a tight, secure fit. I n t e r m i t t e n t failures frequently result from a loose c o n n e c t o r or plug. Connectors 3202 a n d 3203 should b e checked for pushed o r broken pins. If t h e unit has a green 3200 connector, insert c a r t r i d g e and wiggle it. t h e unit shows i n t e r m i t t e n t problems, replace 5200.
Each board with Ltlolex chip sockets with insertion a i d s should have t h e insertion a i d s removed and t h e chip reinserted. Check t h a t a l l components (especially those on t h e p&imetei of t h e motherboard) are properly soldered. Check for broken o r shorted t r a c e lines. Check for a n inductor and capacitor over C201 and R206. C u t t h e inductor and c a p out, being c a r e f u l not t o c u t t h e C201 o r R206 leads.
If unit h a s a standup regulator and heatsink, inspect for hairline f r a c t u r e s between t h e regulator and switchboard. Also e n s u r e t h a t t h e regulator is firmly secured t o the heatsink by a Tinnerman clip or rivet.
Ensure t h a t motherboards (Rev. 8 or lower) have a colored dot over t h e t r a c e on t h e upper-left corner of t h e board. This prevents shortinq t h e board and t h e c a s t i n g (See Figure 3-3).

Two types of 12-conductor cable assemblies have been used on 2600 model units, t h e flat-wire type and t h e ribbon type. When a d e f e c t is found in t h e flat-wire t y p e c a b l e assembly or its male c o n n e c t o r on t h e switchboard, t h e flat-wire c a b l e assembly should be replaced with t h e ribbon c a b l e assembly and t h e 12-pin male switchboard c o n n e c t o r should b e replaced with t h e 1 G i n f e m a l e switchboard socket.
Figure 3-1. 2600 Trigger Circuitry with S t a t i c Modification Install t h e s t a t i c modification on all 2600 units. Install CR202 nd CR203 removing C236 and C237 and inserting the C2361CR202 and CAUTION: C2371CR203 assemblies in their place (See Figure 3-2). Observe t h e polarity on CRZ02 and CR203 (the dark band must be toward t h e 3202/3203 connectors). On t h e switchboard, install t h e static strips as shown in Figure 3-4.
Figure 3-4. 2600 Switchboard S t a t i c Modification
2600A MODEL MODIFICATIONS
Each 2600A ( R e v s 1-1 3) model must h a v e s t a t i c s t r i p s placed on t h e f r o n t panel s w i t c h e s (See Figure 3-51.
Check each c o n n e c t o r and plug for a tiqht, s e c u r e fit. failures frequently result f r o m a loose c o n n e c t o r o r plug.

Intermittent

Check t h a t a l l cornponenets are properly soldered, and check for broken o r shorted trace lines. If a unit exhibits RF i n t e r f e r e n c e t h a t d o e s n o t c l e a n up using normal adjustment methods, o r if a series of lines and bright q r id distortions on t h e screen are accompanied by a loud hum e v e n when properly adjusted, a defective o r leaking c a p a c i t o r may be a t fault. Replace C24l (.I microfarad) and/or C242 (-1 microfarad) located respectively between t h e power jack and voltage requlator.
Figure 3-5. 2600A (Revs. 1-13] S t a t i c Slodifications
TESTING WITH THE DIAGNOSTIC TEST CARTRIDGE (VERSION 2.6)
The 2600 D i a q o s t i c Test Cartridge (version 2.6 DTC) contains a varietv of tests t o assist t h e service technician in identifying t h e source of problems within the VCS switchboard and motherboard hardware. The test cartridge is used in conjunction with t h e equipment listed a t t h e beginning of this section. Each test is reviewed in t h e remainder of this section. Detailed procedures for use of t h e t e s t s a r e described in Section 4, 2600 Diagnostic Flowchart, and Section 6, 2600A Diagnostic Flowchart. The tests available in t h e c a r t r i d g e are: a

Figure 3-12.

Audio Tone Test Screens
PADDLE CONTROL LINES TEST
Purpose: To t e s t t h e proper operation of t h e Paddle Control Lines by viewing conversion inputs of the TIA chip.
the analog waveforms at t h e analog-to-digital
Format: Pins 37, 38, 39, and 40 of t h e TIA chip are checked with t h e oscilloscope with t h e VCS unit in Diagnostic Matrix mode and with t h e shorting plugs in place. This test is required only if t h e r e is a problem with t h e hand controller lines. The procedure for this test is detailed in Section 4.

42a Tlh 4040

2600 Motherboard Schematic

SECTION 4

2600 DIAGNOSTIC FLOWCHART
The Diagnostic Flowchart is intended t o be easy t o use and t h e primary aid when troubleshooting the 2600. Follow t h e prompts in t h e order presented. When a quesrion is asked, follow t h e line from t h a t box which best applies t o t h e unit's condition. The figures referenced in t h e flowcharts a r e located at t h e end of this section. When a line terminates with a l e t t e r inside a circle, note t h a t a page number (i.e., pg. 4-31 is near it. Turn to t h a t page, locate t h e l e t t e r in another circle, and continue t h e diagnosis. The flowchart leaves nothing t o chance, it tells you when t o perform a specific test, and when t o replace components, and even when and how long to "burnin" t h e unit. "Burn-in" the unit for at least two hours a f t e r completing repairs. When a problem is extremely difficult t o diagnose, t h e flowchart sends you to t h e Signal Tracing Cartridge (STC) routine, "D"page 4-47. Due t o t h e repetitive n a t u r e of t h e STC routine, no flowchart is used. Read and follow t h e instructions as directed. Should t h e STC procedure fail t o isolate t h e problem, a f t e r carefully inspecting t h e switchboard and motherboard assemblies for shorted and/or open t r a c e lines, and solder bridges swap a l l t h r e e chips (6507, 6532, and TIA). Should t h e problem still persist, call ATARI, Techline Specialist: Inside California a t (800) 672-1466 and Outside California a t (800) 538-1535. Be certain t o always burn-in t h e unit for t w o hours a f t e r completing repairs. This helps t o ensure t h a t intermittent problems a r e found and also greatly increases your customer's satisfaction with your repair work.

Is modulation

the TV screen?

Check for and

rtplace shorted
caps: ~ 4 , ~ , ~ 0 , C239,C200,CZl'l.
I modulation s evident on the screen?
Bad/No Color, Bad/No Sound Switchboard

I RF mod s

output tuned to 61.25 MHz? (Channel 3)
Can unit b e tuned to 61.25 MHz ( 2 -15 MHz)?

Replace RF modulator.

(or sound)

Is color

now OK?
Short across L 10I. Does color (or sound) reappear?

Replace LIOL.

Gray Bars Troubleshooting Procedure
Isthere a 3-5v p-p signai on the A203 side of R222,

R223.R224?

Y e s Ohm meter. Replace any failed or off-value resistors.

Pg. b 4 5

Do a l l of pins 2, 12, and 15 on A203 have a signai present?
There is an open line between A203 and the resistors. Fix it.

Pg. 4-5

Check inputs of A203 (pins 3,11,14).

Replace A203.

Does each have a signal present?

Do all of pins 5,7,8

on Ahave a signal

present?

Check for open linesbetwen A201 and A203. Fix.

Pg. b 1 5

Gray Bars Troubleshooting Procedure (Continued)

Picture Now

OK? (See

Go to matrix

Figure 4-4)
Make sure 8, 11 R219, R220 have +Iv connected to top side.
Check RZl8,RZl9, RZ2O for proper
Inspect traces around LM lines for shorts or opens.
I picture now OK? s (See Figure 4-4)

'and then A202.

Is picture now OK? (See Figure 4-41

Pg. 4-20

Colored Screen Troubleshooting Procedure Switchboard
I +5v a t JlOl s Pin I ? I RF mod. output s tuned to 61.25 MHz (channel 3 , +.I5

Bad Switchboard

Pg. 4-17

Tune R F mod.

at adjustment hole.
If RF mod cannot b e tuned to 61.25 MHz, replace it.
Is video signal present at JlOl pin 12?
Check for open trace or bad connection between J2Ol and RF

module pin.

Repair,
I JlOl pin s 12 shorted to ground?
~ e f e c t i v 3101. e Replace
C h d c for shorted trace. If none is found, the RF module is shorted and must be replaced.
Colored Screen Troubleshooting Procedure, Switchboard, (Continued)
I +9v present s at JlOl Pin 2?

Is C O 1 shorted? l

Replace C101.

shorted to ground.

Replace voltage regulator (A10 1).

Tune audio to 5.5 MHz by adjusting L2O 1.
Ad just to 2.06 MHz. Look for stable f r tquency.
Can unit be adjusted is sound clear?

Pg. 4-28

Audio Test Procedure (Continued)
Are the two patterns in Figure 4-9 alternating on the screen?
D the patterns o alternate with the tones?

Pn. 4-24

Are both colors and tones consistent each cycle?
Swapout I ) A201 2) A200 3) A202
Are patterns now correct?

(As in Figure 4-9)

Put switches back to initialized positions.
VCS will go through o m last cycle before changing to color bar test.

Pg. 4-30

Changed per ECN #0021

1/29/83

Defective / Lines Troubleshooting Procedure
De (ermine which lines a r e defective by referring to
Uefect~ve 2 Cap. ( R A I M ) L ~ ~ ~ N o.No.

Connector PinNo.

3202-Pin u 3202-Pin 3 3202-Pin 2

C235 C234

. Check the lines
indicated as defective for +Sv a t 3202 or 3203 (See chart).

*h H I-

Is +5v present on the linds) just checked? I
Swapout I ) A) A200 3) A201
Does Diagnostic Matrix now look

cwrtct

Figure 4-6 or 4-7)?

(A2021 pin. I +5v s

p r t x n t there?
berwecn A M 2 pin and the 3203D203.

(~hcd< trace lined.

Check trace l i n d s ) from defective pin(s) for rhora t o ground. Are there any shorn?
Is +5v now present a t t h e

A202 pin?

Replace the
capacitor on that line (see chard.
Does the Diagnostic Matrix screen now ook correct (see Fig. b-6) Swapout 1) A200 2) A201

2600/2600A Domestic VC5

Trigger Line Troubleshooting Procedure

l +5v a t pin 6 s

of 3203 (right) trigger) or 1202 (left trigger)?
Check/repair trace lines from: R225 to 3203, pin 6 (right), R226 to 3202, pin 6 (left). A
Check for VMOD (+Sv) a t top of R225 (right) or R226 (left)

L trigger Line

now operatins

correctly?

1s +Sv a t A203 pin 7 (right
trigger) and pin 9 (left trigger)
Repair open trace from: R225 t o A203
(right) R226 to A203 (left)
I trigger Line s now operating properly?

b 4.5-5v at

A203 pin 6 (right) and in 10 (left)?

Swapout A203.

Is trigger l n ie
n o r operating cofrectly?

Swapout A201

Docs trigger

line now work

swapout I ) A200 2) A202
Does trigger line now W Q d pmperly?

Check/Rtpair C236,CRZOZ

(left)

C237,CR203

(right)
Audio Troubleshooting Procedure,.Motherboard
to isolate the bad board.

BA mmcrbovd

Isrhuea2vp-p square wave whrd alternates betweal two frequencies on Pin 13 of A201?

POSSIBLE CAUSE (switchboard) L101, RF Module RF Cable

AA, pg. 4-21

C208, R211

RA, pg. 4-21

R211, C208, C209

C212, C213, R215

RF Module, LlOl R F Cable

AUDIO FAILURES

No audio
C206, C207, L201 adjustment, ,4201, C206, C207, L201 adjustment, C20 1.42C11, A200, A202
POSSIBLE CAUSE (switchboard)

DLAGNOSTIC FLOWCHART

AH, pg. 4-25
RF module adjustment XF module adjustment

'Afeak audio

AH, pg. 4-28

DTC audio

test fails

AD, pg. 4-24

2600 FAXLURFc (Continued)

CONTROLLER FAILURES

DIAGNOSTIC

POSSIBLE CAUSE

F i r e button does not work Joystick does not work

Dr ivin? Cunlroiier s

(motherboard)
A203, 5202, 5203, defective Controller A202, 5202, 3203, defective Joystick A202, J202, 5203 defective Con troller A20 1, C215-C218, 5202 - 3203, defective controller
POSSIBLE 'CAUSE (switchboard)

FLOWCHART

AG, pg. 4-27

AF, pg. 4-26

Paddle Controllers

pg. 4-34

OTHER FAILURES DIAGNOSTIC

POSSIBLE CAUSE SYMPTOM

Switches not working

(switchboard)

S102-S106, JIOl

A202, C222-C227

FLOWCHART ENTRY POINT

AL, pg. 4-32

2600A FAILURES

LOGIC F.ULURES (2600A)

Solid colored screen Vertical lines
A200, A202, A20 1, X200, 4200, RF Module

A200, A201, A202,

I, pg. 6-10

I pg. 6-10 ,

3200, open or shorted Address or Data line

VIDEO FAILURES (2600A)

Snowy screen Weak picture Vrong Gray Bars Revisions 1-Wrong Gray Bars Revision 14
POSSIBLE CAUSE A203, 5201, RF Vodule, L205

K, pg. 6-12

RF Module, RF Cable

M, pg. 6-14

N, pg. 6-15
Warped picture Revisions 1-13 Warped picture Revision 14

C, pg. 6-4

C l , pg. 6-5

2600j2600A Domestic VCS

2600A FAILURES (Continued)

COLOR FAILURES (2600A)

DIAGNOSTIC FLOW CHART ENTRY POINT

No color

POSSIBLE CAUSES
X200, A201, C210, C211 RF Cable

P, pg. 6-16

Only t h e reference bar appears

Color won't

a d just

Weak color

RF Module, C210, C211, RtlO, RF Cable

AUDIO FAILURES (2600A)

C206,. C207, 0 1, R F Module ad just ment
A201, C208, R207, C2O6, C207,

Weak audio

X, pg. 6-24

R F Module adjustment

Diagnostic test cartridge audio test fails
2600A FAILURES (Continued) CONTROLLER FAILURES (2600A)

Can R F module b e properly tuned?

Replace R F module.

Tune R F module.
3.5-5V P-P signal on A201 side of R217.
D e f e c t i v e R217 or d e f e c t i v e CR203. or d e f e c t i v e A20 1.

Defective R221 o r R23(

Swapout 1) A201 2) A200 3) A202

Good video: Yes

2600A Gray Bars Test Procedure
Place color/ black & white switch in B&W posit ion.

Pg. 6-8

I proper gray s bar pattern present? (See Figure 4-4).

Pg. 6-13

Is a partial segment missing or i any color s present? (See - Figure 4-51

Pg. 6-14 or 6-15

M 2600A Revs. 1-13 N 2600A Revs. 14 and up
2600A Color Bars Test Procedure

Reconnect VCS

and initialize.

Pg. 6-2

Are color bars present on screen?
Adjust R213 so that color
is aligned properiy (See figure 4-2).

1s VCS tunable

Pg. 6-14 or 6-15 M - 2600A Revs. 1-N 2600A Revs. 14 and up
2600A Defective Switcn Troubleshooting

CONNECTION CHART

With inoperative switch in open position, i there s +5v present at the A202 side of it?
Switch Pin No. Color/~lack and White 21 Left Difficulty 17 Right Difficulty 16 Select 23 Reset 24

9 Pg. 6-9

Close the switch.
Is there an open between A201 and that switch?
1s switch connected to ground on other side?

Replace switch.

Repair trace.
2600A D e f e c t i v e Switch Troubleshooting ( C o n t i n u e d )
I switch internally s shorted?
Is cap on that line shorted ,Yes t o ground? (See chart)
/Is there +5v on the RAM pin for that switch? (See chart)

1) A202

2) A200 3) A201

A202 Pin No.

Left Difficulty Right Difficulty Select Reset

Open between RAM pin

and inoperative switch.
2600/260014 D o m e s t i c VC:
2600A SoLid Colored Screen Troubleshootinq

!s L-lv p+ QO siqnal

?resent on pm

i AZOl?

Swapout 1) A200 2) 4202

Does unit ~W-IO~?

Pin b A201 snorted.
1 4-Sv p-p s slqnal xesent on DUI 27 A2OO?
pen between pm 27.+ZOO;, and pm A201.
Swapour 1 ) A201 2) ,420fl
IS b-sv p+ S)Z siqnal x e m r on pm ZS.4200?
Pin !S AZOO saortcd to ground. Reoair.
Is Jv p-p signal S aresent on pin 26 A2011
beween Pm 26 A201 and pin 28 A2(XI.

Open oerwccn pin 39 A202

and pm 29 A200.
2600A Solid Colored Screen Troubleshooting (Continued)

F i g u r e 7-2. Joystick S c h e m a t i c

/ h Domestic VCS

JOYSTICK ( X - Y CGNTXCLLEI?) CHEC;<

Zquiornent Needed

e T.V. s e t

a Known good VCS unit

a Combat cartridge
1. Check for c o s m e t i c damage.
2. P!ug in cartridse a n d plug c o n t r o l l e r t o h e tested into t h e l e f t "!aver port.
3. Turn on unit and p r e s s GAME SELECT until g a m e i.l S appears.

Press G.A.\IIE RESET.

5. Push t h e joystick handle a w a y f r o m you a n d t h e plane should go dourn.
6. Pull ;he joystick handle t o w a r d you and t h e plane should go up.
7. Move t h e joystick r i g h t and plane should meed up. should slow down. 3. Push t h e Red b u t t o n and t h e plane should fire. 9. This c o m p l e t e s t h e (X-Yc o n t r o l l e r ) check.
l o v e it Left a n d p l a n e

26C0/2600A Dom'estic VCS

P.ADDLE CONTROLLER
t a c h g a m e paddle consists of a 1 Megohm p o t e n t i o m e t e r t h a t , when varied, causes d i f f e r e n t values t o be seen a n d a c t e d upon by t h e TIA. Also c o n t a i n e d in t h e paddle is a s i m p l e spring loaded push-to-make pushbutton switch. T h e r e a r e t w o g a m e paddles c o n n e c t e d t o e a c h I/O plug. F i g u r e 7-3 i l l u s t r a t e s t h e paddle c o n t r o l l e r assembly and F i g u r e 7-4 t h e paddle c o n t r o l l e r s c h e m a t i c.
F i g u r e 7-3. Paddle Controller

WrrON CGNTROL I

PIN 4 PIN 5
Figure 7-4. Paddle Controller Schemaric
P,+DDLE CSrU'TXOLLER CHECK
E a u i ~ r n e n tYeeded

T.V. Set

Known good VCS unit casinoT'; c a r t r idqe
1. Check for cosmetic damage.
2. Plug in cartridge and plug controllers t o be tested into the left player port.

3. Press game reset.

Press the button on one of the controllers. A air of numbers shouid appear.
5. When you turn the knob, one set of numbers should 70 between 20 and 2QO by steps of 20. T h e numbers should not advance r e a t e r than a step of 2'3.
6. Repeat steps 3, 4 , Jc 5 for the other controller.

DRIVING CONTROLLER

T h e h e a r t of t h e driving c o n t r o l l e r is a switching d e v i c e t h a t g e n e r a t e s a full two-bit g r a y c o d e for each q u a r t e r t u r n of t h e c o n t r o l l e r knob. The o u t p u t of both t h e g r a y c o d e g e n e r a t o r and t h e pushbutton switch is d e t e c t e d by t h e 6532, causing t h e program to respond accordingly. r a n g e of t h e knob. Unlike the non-linear resistive g a m e paddles, t h e driving c o n t r o l l e r gives t h e user p r e c i s e linear positional c o n t r o l o v e r t h e c o m p l e t e turning As w i t h t h e game paddles, t h e r e is a s i m p l e push-to-make ~ u s h b u t t o n switch l o c a t e d on t h e side of t h e controller.

The driving controller

in assembly is illustrated in F i g u r e 7-5; t h e seL-.: :-.?tic F i g u r e 7-6.
Figure 7-5. Driving Controller

TRUTH TABLE

F i g u r e 7-6. Driving Controller S c h e m a t i c

DRIVING CONTROLLER CHECK

Equipment Needed

T.V. s e t

Known good VCS unit Indy 500 c a r t r i d g e
Procedure 1. Plug in Indy 500 c a r t r i d g e and plug in driving controller t o b e t e s t e d in l e f t hand port.
2. P r e s s game r e s e t switch. 3. Turn controller knob and insure t h a t c a r t u r n s in t h e s a m e direction as t h e knob. Insure t h a t c a r doesn't skip position o r wobble between positions* There should b e 16 d i f f e r e n t positions for t h e c a r.
4. Press down on t h e knob and lightly wiggle i t back and forth. T h e c a r should not move a t all.
5. Press down on t h e r e d button. The car should m o v e forward.
6. If t h e c o n t r o l l e r fails any of t h e a b o v e t e s t s i t is d e f e c t i v e.

KEY BOARD CONTXOLLER

T h e keyboard controller (Figure 7-71 is a 12 button calculator-type switch array that functions like a small computer keyboard. When one of t h e pushbuttons is pressed, the corresponding s e t of sense lines is closed, completing t h e circuit. illustrates the keyboard wiring and Figure 7-9 the keyboard schematic. The closure is Figure 7-8 d e t e c t e d by t h e 6532 and appropriate action is taken by t h e program.
Figure 7-7. Keyboard Controller

Figure 7-5.

Keyboard Wiring Diagram
F i g u r e 7-9. Keyboard S c h e m a t i c
2600/260GA D o m e s t i c VCS
K E Y B O A R D CONTROLLER CHECK E q u i p m e n t Needed

T.V. set

Known good VCS unit Brain G a m e s c a r t r i d g e
a One good keyboard c o n t r o l l e r
1. Check for c o s m e t i c d a m a g e.
2. Plug in Brain Games c a r t r i d g e and plug t h e known good keyboard into t h e right -hand plug.
3. Plug t h e c o n t r o l l e r t o b e t e s t e d into the left-hand plug.
4. Press g a m e s e l e c t until g a m e 819 a p p e a r s and p r e s s g a m e r e s e t.
5. If an audio tone sounds, t h e c o n t r o l l e r is defective.
6. S t a r t i n g with t h e "I" key, press t h e keys in t h e following order: 1, 2, 3, 4, 5 , 6 ? 7, 3, 9 , *, 0, I/. E a c h key should g e n e r a t e a t o n e lower t h a n t h e key before it. 7. Test completed.

2600/26GOA Domestic VCS

SECTION 8
CX2600 DOMESTIC (M/N) VCS

Part No.

& Y

Mother Mother Mother
CO14180-07 C014181-01 CO14181-02
Description Cap. Ceramic Axial 470pF (50V) Cap. Ceramic Axial.001uF (25V) Cap. Ceramic Axial.O 1uF (25V)
C216,217 (Alternate for P/N 2B-003) C213,223-235 (Alternate for P / N 2B-008) C2O3,ZO5,212,236, 237,240,244 (Alternate for P/N 2B-007) C200,208,222,238, 239,242,245 (Alternate for P/N 2C-001) A203 C2 18-C214 C243 L200,203-205 XA200 XA20 1,202 X200 (Alternate listed) (Use Rev 16 or above) 5200 (Part of) L(Part of) S200,205,206, (Alternate for P/N C012241) 4200,201 APin Version 5200

Mother

CO14181-03
Cap. Ceramic Axial.luf (25V)
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C014348 C014353 C014369 C014373 C014384 CO14386-08 CO14386-09 C015510 C015519 CCO 1.5574 CO 1.5575 CO1.5752 C01.5902 CO 1.7297 CO I.7549
Voltage Regulator 78M05 (5V) Cap. Epoxy Dipped.068uF (IOOV) Cap. Elec 4.7uF (35V) Cap. Elec 22OOuF (16V) Inductor Ferrite Bead Socket IC (28 Pin) Socket IC (40 Pin) Crystal 3.579575 Mhz P C Board Socket Cartridge Shield Top Shield Bottom Inductor 1.8uH Connector Switch Static Strip Switch Slide (PCB) Transistor 2N3906 IC Timer (555) Dust Cover Assy R F Module Socket Assy (Cartridge) CX2600A PC Board Assy PCB/Shield Assy Zener Diode/Axial Wrap Assy Speed Clip Fastener Nut Lockwasher
Resistor Variable 1 Meg 2600/2600A Domestic VCS Changed per ECN #0021

/39/R3

CX2600A DOMESnC (MIN) VCS
Paddle Paddle Paddle Paddle Paddle Paddle Paddle Paddle Paddle Paddle X-Y Cntl X-Y Cntl X-Y Cntl X-Y Cntl X-Y Cntl X-Y Cntl X-Y Cntl X-Y Cntl X-Y Cntl X-Y Cntl
Part No. C010737 C010738 C010739 COl08lO C010970 COl2766 CA010837 CA010933 CA0 10953-03 CAO 11620-C010726 C012107-02 C012108-02 C012109 C012110 C012ll4 C012116 C012951 CAOlS396 CAO16741
Cover Top Cover Bottom Fire Button Cable Y Control Sleeve Label Paddle Control Knob Assy Control Cable Assy Paddle Control Assy Switch Cable Cover Top Case Bottom Boot Retainer Ring Fire Button Handle Spring PC Board (Two-Edged Connection) PC Board (Single-Edge Connection)

T h e above problems m a y temporarily disappear when t h e unit is turned off f o r a few minutes and then turned on again.
These 2600A problems have been diagnosed by A t a r i as being caused by a leaking o r d e f e c t i v e C24l (.I microfarad) a n d l o r C242 (.I microfarad) l o c a t e d between t h e power jack and voltage regulator.
Replace t h e d e f e c t i v e components with o n e s f r o m your kit. Make certain t h e replacement components a r e r a t e d a t a v a l u e 50V o r greater.

SERVICE BULLETIN

2600 Video Computer System

I DATE:

February 18,1982
PROBLEM Damage t o Hex Buffer, and other components
S t a t i c discharge SOLUTION To provide protection from s t a t i c discharge a Zener diode must be placed between t h e trigger lines and ground. Also, s t a t i c strips must b e placed on the switches of the switchboard. (Refer t o pages 3-3 thru 3-5 of your ATARI VIDEO COMPUTER FIELD SERVICE MANUAL DOMESTIC MODEL 2600/2600A.) T h e p a r t number f o r t h e Zener ~ i o d e / A x i a lCap. Assembly is CA018263 and can b e ordered (at no charge to you) from Sales Order Processing, Sunnyvale, a f t e r March 8, 1982.
You should have the static strips (Part Numbers C017294 and C017297) in c u r r e n t p a r t s inventory. If you d o not, please order t h e m when you order t h e Zener/Axial Assembly.