Radio shack Project-board series User manual

www.SteamPoweredRadio.Com

.

~-booii

,M

clock/

calendar

/radio

timer

CATALOG NUMBER 277-109

www.SteamPoweredRadio.Com

SYMBOL

C1

C2

C3

C4

CR1

.4,5

CR2

CR3.6.7,

1J.23

CR9-12

D1

-D6

IC1

IC2.3

IC4

K1

L.51

01,2

,3

04

,5.6

R1

R2,

18

.

19

,

21

,

23

R3

R4

RS

This package contains a complete circuit card ready for parts

to

be

added.

To construct this Project you'll

need

the

following parts :

DESCRIPTION

220uf

/

35V

Electrolytic

Capacito,

.01uF (10,000pFI

Ode

Capoc;o,o,

100pF Disc

CIIIPIC

i

tor

47pF

Disc Capecitor

1

N400f

Oiode

Bridge AICtifier

ll

1N914 Diode

ubminilture

C._,

LED

Common

c.thodo

LED

7 Sogment

0-

Ck>ck/C.fendllr/Radio Timer

Integrated Circuit

RS1756

Segment

OrMI'

lnI...-atld

Circuit RS501

He•

Digit

DrW

lnt

..

eted Circuit

RSSOO

MinilltlKe OPOT

RNy

SOHMSp•l<o<

T,.,,...o,

RS2031

Trantistot RS2033

82

OHM

)S,

Watt Rnistcw

12K.¼. Wen

R•iltor

27K

)S,

W.«

Resislo,

2)50K

Trim

POlentiome't•

1.2K

Mt

Wan

Reiltor

'

'-'

PARTS LIST

RADIO SHACK

OTY. CAT. NO. SYMBOL

272-1029

R6

-12

272

-131 R13

1 272•123 R14-16,

20

1 272-121 R17

3

2711,1101

R22

1 276-1151

S1

14 276-1620 S2,3,7

5 276-046

54

.6

6 276-062

S5

T1

276-1756

2 276-1701

276-1702

275-206

1 40-245

3 276-2031

3 276-2033

1 271-000

5 271-000

271-000

271 -

219

271-000

NOTES,

1 CR21 end CR22

1<0

-k>nol

2

10K

Resat0r

is

optionll

for

SOK

'"Trim Pot

"'

.

3 This

ii•

.......

Clbinet

to

u•

for thts Pro;.ct.

4

Thew

s-t•

••

optional

.

DESCRIPTION

330

OHM

¼ Watt

Raistor

470

OHM

¼

W.u

Res

.st

or

120K

¼ Watt Resistor

150

OHM

Mo

Watt Resistor

47K

)S,

Wall

Resit.to,

Rot•v

Switch 2

Po~

. 6 Position

SPST M1n1eture

Push-Sulton

Switch

SPST

Toggle

Sw

itch

SPOT ToggJe

Switch

, Neu1ral Cent..,

12V/300mA

Transformer

»E•Plf.-nenter

's Cabinet

9V

Battery Clip

8

AA

Ceo Battery Holder

ACSod<ot

41

~·-

5-on

e .28 Pin Ouel-ln-Lnw

Sodtet

f)14

01.11l

•

ln

•

L1ne

Socket

Univer.1

Oaplay

Board

l'Tojoct 8ol<d

CPC

8-dl

22

Hookup Wire

Ltne Cord

AA

Battery

Misc

.

Hardware

RADIO SHACK

QTY. CAT. NO.

4

1

8

1

9

1

8

271-000

275-1386

275-1547

275-324

275

-

325

273

-1385

270-261

270-325

270-387

270-642

270-1393

276-1997

276-1999

277-108

277-109

278-1296

23

-

453

www.SteamPoweredRadio.Com

CLOCK/CALENOAR/ASSEMBLY INSTRUCTIONS

Thil

Clock/Cal-/Tl,,w

circuit

11

-•lie

enough

to

atlofy

the

moot

avid

of

kit

buildenl

It

--

many

,-.,'"

u1uaUy found

_.ioty

In

other

circuits.

Thell

f-.,,.

Include:

a

28/30/31

day-

Cit.,~

matk:elly

countl

the

c:orrec:t

n.....-

of

dayo

for

ach

month

I)

;

a

12

or

24

hour

mode

option

that

can

be

-

without

exteno!Ye

modifications

to

the

circuit (just

acid

e

-1)

;

.,

_,,,

that

ii

e

true

24

hour_,,,

(,_.,.y

,_

the_,,,

by

clollng

the_,,,

Mitchll;

-

a

radio

tlm.-

that

can

be

at

for

e

IINp

mode,

-e

up

mode

or

a

combination

of

both

Ut

can

be

u,ed

to

tum

on

.,.II

appUenc:a

tooil

. Follow

the

Instr-

uction,

carefully -

you

will heve

a

Time/Tim.-

dllYlce

that

ii

hi9hly

accurate-~

WARNING

:

TIie

...,._

wll

....

1211

vo11S

-the

.,.in.y

;

.......

II

vwy

..__

....

-

.......

the_.....,

project

.--ty

.

NOTE :

Solder

ell

1-

on

the

COllP9I'

side

of

the

P.C. -

and

clip

exc:aa

wire•

you

compiete

ach

step

(See

F

lgurft

1 - 2).

1. Installing

the

ju.._

wl,_

:

L

Cut a

1" piec:a

of

wire

from

the

line

cord.

Strip

a

l4

•

of

l,_letlon

from

eKh

and

-

in.t

It

In

the

J1

pooltlon. . '

NOTE: It

ii

,-lded

thet

you

.,.

the

'-ler

-

wire

on

the

120110lt

(prlmety)

lide

of

the

transformer.

b.

Cut

t"J

required

nu-

of

pleceo

of

hookup

wire

to

the

-

lengths

for

the

rat

of

the

ju.._

pooltlono.

Strip

a l4"

of

ln..i.

tlon

from

both

Wldl

of

eKh

ju,_

wire

and

Iran

-

wl,.

Into

their ra,pectlve

-ltlonl.

NOTE

:

.....................

2-3,lle-•..-a

...

"'

..

-dlncllan;

....................

the

........

-

--

......

.

n..dladll-

~.......,

____

...,

............

._

.......

.

c.

.......

2. Install 1N4001 dk>del CR1.

CF!4

and

CRl5.

3.

1-11

1N914

-

CRJ.

CAB,

CR7,

CR13

through

CR20-

CR23.

4. Mount

the

Bridge

Rectlfla- CR2.

Obewve

polslty

(+

- -).

FIGURE 1. TOP

OF

P.C. BOARD

5. Mount

the

%

wett

r..ioro

In

their ra,pectlve loc:etlons • follo..e:

a.

82ohm.-orR1

.

b.

120K

r•iston

R

14

through

R1B

and

R20.

c.

27Kr-R3.

d. 1.2K

r•lltor

RS.

L

330

ohm

raiston

RB

through R12.

f. 470

ohm......,,

R13.

g.

150

ohm

..-

R

17

.

h. 12K

re,istor,

R2, R18, R19, R21 -

R23

.

L

47K.-orR22.

6. Sinc:a

the

60/BOHz

-up

circuitry (12V

battery

,upply)

operetn

in conjunction

with

the

dltplay oocllletor, more occurete

opentlon

may

be

obtained

by

uling

a 50K

trim

potentlometar

In

the

R4 loc:etlon. If

thil

accuracy

ii

not

required. you may IUbotltute

a

10K

%-

reoiltor.

The

following proc:adu,_

-9y

:

L

Install

the

"trim

Pot''

In

the

R4 location,

or

-

b. Install

the

10K

%

wett

-

bet-.

hole,

X

and

Y.

7. Mount

the

_!ton

In

their ra,pectlve

loc:etlona•

follo..e:

L

220uF/35V-ltor

Cl

.

Qbewvepolwlty

(+and

- 1.

b.

.01 uF

-ltor

C2.

c.

100pF

-ltor

CJ

.

d.

47pF

-ltor

C4.

8.

Mount RS2031 tranaistora

a •

02

and

03

.

9. Mount RS2033

t,....ltorl

04,

05

and

06.

10. Mount

the

2B

pin dual-In-line ,ocket.

11. Mount

three

14

duaHn

-line

IOCketa.

12.

1-1

the

OPOT

relay

Kl

•

13.

Cut

a piec:a

of

wire

from

the

line

cord

long

enough

to

extend

from

the

AC

SOCKET hole,

(P

.

C.

boerol

to

tho

AC

-i,.-,

(to

be

mounted

on

tho

beck

penel

of

the

c:aNI.

The

length will

depend

on

the

c:aN

atyle you

wlah

to

mount

your

clock

in.

Make

a

7'

cut

through

the

-•

In

the

ln111I•

tlon.

Strip

a

l4

•

of

ln..letlon

from

ach

wire

end

and

inlll't

the

enda

In

the

AC SOCKET

hol-.

---------

~

··----

.....-;

~

~I.••

IE;.-

■

~0

Ill~~

l\:j-

:,,

~);

.

..

FIGURE 2. X- RAY VIEW OF P

.C.

BOARD

•

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NOTE:

Befort

Installing

the

line cord,

lnwt

I

grommet IRS CAT.

NO

.

64-3025) Into

1n appropriate

hole

In

the

back penel. Then

thrNd

the

line cord through

the

hole

and

tie

I

single

knot

in

the

cord, Inside

the

cue,

to

act

111

strain relief.

14. Install

the

line

con:!

In

the

AC

IN

terminals.

15

. Install

the

12V/300mA

transform.-

Tl

. CAUTION: To

Nducll -

llaard

you

.,_Id

.,._

in.,11t1ng

._

-

me

AC

end

rally

wmlnela

•outlined

In

F

....

2.

16

. Install

the

9V

battery

clip-red

wire

to

BAT+1nd

bltck

wire

to

BAT

-.

17. lnaert

hookup

wire Into

the

11>11ker

holes. Note:

K-

In

mind

the

location

of

the

IPllkW

after

It

is

mounted.

18

. If you wish

to

have•

24 hour clock, merely

ldd

another

diode

ICR2')

between points V

Ind

H.

HOW&Yer,

you will loae

the

blinking colons

Ind

the

PM

Indicator.

For

Countries with 240VAC/50Hz only:

19

. Subotitute t 240VAC

et

50Hz/12VAC,

300mA

transformer (RS

CAT.

NO

. 273-9007) for

the

one

callld

out

In

the

Perts List.

20

. For 50Hz operation,

edd

diode CR22

-.n

points I

and

W.

3. Mount four light emitting diodes (LED's). Be sure

to

install them with

the

dlodea

In

oeries

Icathodes pollitioned

as

shown In Figure

31

. They form

the colons (:) separating the hours digits from the minutes digits and the

minutesdigits from

the

-onds

digits.

4. Mount

the

fifth LED, CRB, as Illustrated

in

Figure 3.

Thil

ii

the

PM

indi

cator

.

The

tnode

end

will

be

connected

to

the

PM+

output

from the

PC

board

and

the

cathode end

to

the

PM

-

output

.

FINAL ASSEMBLY

NOTE :

The

following

a-ly

proceduru

require

the

UN

of

the

case

that

ii

listed in

the

Perts List. This

is

e suggested layout only. You may

uN

any

caN

you desire provided

thlt

you follow

the

point-to-point wiring

1s

shown

In

Flgure 5.

1.

Mount

the

switches on

the

back penel

of

the

caN

eccording

to

your

own

desires,

or

according

to

our

layout as

shown

in

Figure 5. Be careful

to

■

llow

cl•r

■

nce

for the relay and

transform•.

2. Plan

the

location

of

the

PC

board

on

the

bast

penel

of

the

case-allow

room for

the

Speeker

and

the

Battery Holder.

3. Mount

the

Speeker.

X·RAY

VIEW

*(DI)

*

(D2) *(1)3)

*(D~

llf

(D5)

*{1>6)

5D

SI

5F

SC

•

c"ntooc

PM

INDICATOR

DI

CATHODE

oz

o_

0

CATHODE

FIGURE 3. UNIVERSAL DISPLAY BOARD

ASSEMBLY INSTRUCTIONS FOR THE

UNIVERSAL DISPLAY BOARD

The belie

Id•

is

to

connect corrtop0ndlng

_,,ents

from

-h

digit

display together on

I

common run,

or

-

■

grnent

bu•

1-

Fi9ura

3).

For•

tXlmple,

the

"A"

-,ientt

from

~

digit

are

connected together

vi

■

the

number

3 (SA)

bu•;

likewise

for

the

"B"

-,ients.

number 6

1S8)

through

the

G

_,,ents,

number

4

ISG).

The

-en

-

■

grnent

bu-

are

then

connected with

hookup

wlra

to

the

proper

-

■

grnent

drlvw

outputt

from

the

PC

botnl.

1.

Conntct

the

jumper

wh

..

•

shown

on

the

Un-

Dioplay

B-

drtwlng (Figure 3).

The

drtwlng

II

1n

X-ray view

lit,

looking

"through"

the

board)

to

old

In

proper

orlentltlon

. You will

need

approxlmottly

50

pl

■

coa

of

hookup

wlNI;

-h

one

no mora

thin

%"

long.

Strip

the

ln-

aulltlon

from

these

pl

■

coa

ond mount

them•.-

In

Fifura

3. These

wirN

mount

on

the

skit

-It•

the

printed circuit

1nd

pea

through

me

holn

provided

to

conntct

to

the

printed circuit.

NOTE:

In

the

following

Ill!>

you

moy

Install six

14

du1H<>•llne

■

ockltl

on

the

board

or

you

con

mouni

the

LED diapllysdlnoctly

to

It.

2. Mount

the

LED digital dlspltya

on

me

•me

side

II

the

jumpers.

Bt

sura

to

position

them

11

.-

In

Fi9uN1

3 lnot•

the

locltlon

of

1)

CATHODE

03

05

CATHODE

SECiNENT

I

THRUII

'

06

•

NOTE: • Optional inputs for Digit Drivers.

4. You

may,

at

this

time

mount

the

display

bolrd

on

the

front

penel

ulling

%"

specers;

hOWIYer,

It

11

-ier

to

solder

the

hookup wire

to

It

ii

It

II

left

frN

tempor.-lly.

5. Solder

the

Speeker

INdl

to

the

Speeker.

6.

With

hookup

wlNI

connect

the

following displey segment

bu-,

SF,

SE, SB, colon+,

colon-,

PM

Indicator+,

and

PM

Indicator-

to

their

corrtop0ndlng

outputs

(holes)

on

the

PC

board

.

7. Connect

the

following display

_,,ent

bu-

,

01

through

06,

SC, SG,

Ind

SA.

Note:

The

digit drivers

may

be

connected

to

the

optional Inputs

(Figure

3)

.

www.SteamPoweredRadio.Com

8.

U•

hookup

wire between

the

following points

(IN

Figure 5):

P.

C.

BOARD

R(PIN

111-

EIPIN

51

-

S(PIN

121

-

Q(PIN 10) -

O(PIN51-

U(PIN

7)

-

G(PIN4)

-

T(PINB)-

F(PIN

&>-

N(PIN

8)"

B(PIN

5)-

P(PIN 9)

C(PIN 5)

A(PIN4)

J(PIN

81

K(PIN

91

L(PIN

101

M(PIN 12)

BACK PANEL

S5(80TTOM

TERMINAL)

S5(CENTER TERMINAL)

S5(TOP TERMINAL)

S4(BOTTOM TERMINAL)

S4(TOP TERMINAL)

S7(BOTTOM TERMINAL)

S7(TOP TERMINAL)

S6(BOTTOM TERMINAL)

S6(TOP TERMINAL)

S2(BOTTOM TERMINAL)

S2(TOP

TERMINAU

S3(BOTTOM TERMINAL)

S3(TOP TERMINAL)

Sl(TERMINAL

11

St(TERMINAL

6)

St

(TERMINAL 5)

Sl(TERMINAL

41

St(TERMINAL

3)

NOTE: If

24

Hr

operation

1nd

50Hz

operation

ore

not

used,

points

V,H,

I and Wwill

not

be

used.

9.

Install

tho

Integrated Circuits (IC'sl in

their

respective sockets.

CAUTION:

Tliilii

-•

..

.,._,,

auaceptlble

to

darriilgt

from

l1allc

.,,,._

We~

that

you"--

them

by

the endl.

DO

NOT

TOUCH THE

PINS'

NOTE: A

dot

or

indentation

at

one

end indicates pin 1. Ensure

that

the

IC

's

are positioned

II

shown in Figure 1.

a. Insert

IC

·l (RS1756).

Be

sure

to

align

the

pins with

the

oocket

holes.

They

are

,,,_

of

,oft

metol

and

will bend very easily.

b, Insert

IC-2

and

IC-3 (RS501)

1nd

IC-4 (RS500) using

the

same

precautions

as

in step

a.

10

. Before mounting

the

PC

board

and

Display board, carefully check

all 10ldar connectionL Make sure

that

there

are

no

cold 10ldar joints and

thlt

,older

does

not

bridge across edjacent

copper

lands. Check

that

all

hookup

wiring

is

correct (point~to--poind.

11

.

We

suggest

that

you plug

in

to

a power source

to

make sure all

segments

of

the

LED displays are energized. A

word

of

cautjon

: Be sure

that

the

unit

is

well insulated. Do

not

place

the

unit

on

a metal surface

and avoid touching

any

bare

contact

points.

12. On initial application

of

power

,

the

board

will display all eights,

or

random numbers.

To

start

the

counting

of

the

clock, depress either

S2

or

S3

. Normally, digits 2

and

4

will

not

light until

S2

or

S3

is

depressed and

held.

13.

Rotate

switch S1

to

each

PQs

i

ton

.

If

the

clock

does

not

count.

or

a

segment does

not

light, refer

to

the

troubleshooting chart.

14

. Using

½"

spacers,

U"IOUnt

the

PC

board

on

the

base panel

of

the

case.

15. Again using ½" spacers.

mount

the

Display board

on

the

front panel.

OPERATING INSTRUCTIONS FOR THE CLOCK/CALENDAR

1. When

powet

is

Initially applied,

the

Clock/Calendar will display all

S's. Depressing

either

S2

(Min/Day)

or

S3

(Hr/Mo) will

start

the

count

•

ing

of

the

clock; however,

02

and

04

will

be

blanked.

2.

To

•t

the

clock,

rotate

switch

St

(Counter Select)

to

Set

Clock.

Depress

S3

-

the

seconds digits will revert

to

00

and

the

hours

digit will

advance

at

a 1Hz rate. Depress

S2

and

the

minutes digits will advance

at

a 1Hz rate.

Rotate

S1

to

the

Run Position.

Note

:

Sett

i

ng

the

digits

of

any

counter

will

not

affect

the

other

digits

of

the

counter

or

the

con

•

tents

of

any

other

countar

.

The

time

displayed will hold until

the

switch

is

moved from thi1 Polition. Thia

f•ture

enables you

to

synchronize

your

clock

by

•tting

It

ah-

of

the

reel

time

;

and

,

when real

time

co

in·

cides with Set Time.

rotate

S1

to

Run position.

3.

To

silt

the

calendar,

rotate

St

to

Set

Cal

and

perform

the

same pro-

cedures

II

outlined

in

step

2.

The

digits will

tdvance as

before with

the

following e)(ceptions:

a.

The

colons,

PM

Indicator

and

seconds digits will be blanked.

b.

The

Hr/Mo digits will

advance

only

to

12,

then

revert

to

1.

The

Min/Day digits will

tdvance

to

31.

c.

Rotate

St

to

Run.

The

Min/Day digits will

tdvence

to

28,

30

or

31 days according

to

the

month

.

February

29

must

be

•t

manually.

The

calendar

will

automatically

count

from February

29

to

March 1.

4.

To

•t

the

alarm,

rotate

St

to

Set

Alarm (the seconds digits wi

ll

be

blanked). Advance

the

digits

to

the

desired

sett

i

ng

-u

p

to

24

hours-

and

position

S6

(Alarm On/Off)

to

On.

Then

rotate

St

to

the

Run

posi-

tion.

At

the

preset time

the

alarm

will

sound. It

can

be

turned

off

with

S6

at

any

time;

but

, since

the

A~rm

Time

and

the

reel

time

remain coin-

cident for

60

18Conds,

the

alarm

cannot

be

reset until then. Placing

S6

to

On

again will allow

the

alarm

to

,ound

at

the

•me

pre•t

time

24

hours later.

5. When

the

alarm sounds,

you

can

depre,s

S7 {Snooze switc

h}

for an

extra

10

minutes' sleep. You may get as many "

10

minutes

' e)(tra sleep"

11

you desire

by

depressing S7 until

S6

is

~•ed

to

Off.

6.

To

eet

the

Timer for a radio

or

a small appliance {less

than

600

watts)

rotate

St

to

Set

Radio

(the

seconds digits will

be

blanked). Depress

S3

and

the

hours

digit wi

ll

count

down

from 9

to

0. Depress

S2

and

the

minutes digits will

count

down from

59

to

0.

Set

in

the

length

of'tlme

(hours

and/or

. minutes)

you

want

the

radio

to

play. Place

S4

(Radio

On!OHJ

in

the

On position and

rotate

S1

to

Run.

7. You have a choice

of

three

timer

modes

:

a.

If

you

want

the

radio

to

turn

on

and

play for

the

time

set

in

,

place

S5

(Mode A

&

B)

switch in

the

up

position and

rotate

St

to

Run.

The

radio.

or

applNlnce, will

turn

off

automaticaJly

at

the end

of

the

time

oet

in. Label

this

position-SLEEP

.

b. If

you

wish

to

wake

up

to

music, place

S5

in

the

down position.

The

radio will

come

on

at

the

alarm time

and

play for

the

preset

time

then

turn

off

automatically. You may

tum

the

radio

off

with

S6

at

any time prior

to

the

preset time. Label this position

RADIO

WAKE

UP.

c.

If

you

want

the

radio

to

play for

the

time set in,

turn

off

auto

·

matically,

then

come

t,ack

on

again

at

the

alarrii time, place

S5

in

the

center

position. When

it

comes

on

at

the

alarm ti

me

, it

will play until

turned

off

manually with

S4

. Label this pas:ition

BOTH.

8. Label

the

rest

of

the

controls

according

to

Figure 6.

9. If

you

have

mounted

the

"trim

pot

"

In

the

R4 location, you wi

ll

want

to

adjust

the

50

/60Hz backup circuitry

(battery

backup):

NOTE

:

When

on

battery

power

only

,

the

displays

w ill

be

blanked

Ito

extend

the

life

of

the

batteries)

but

the

clock

will

continue

counting.

a. Operate

the

clock

on

bettery

power

only

(line

cord

unplugged)

for

10

seconds

then

plug

In

the

line

cord

again. Use a

stop

watch

or

sweep

second hand

of

• standard watch

to

compare

the

elapsed

time

of

the

clock

to

that

of

the

watch. If

the

clock

runs

faster

or

slomr,

adjust

R4 -=cordingty. (To increase frequency,

rotate

R4

clockwise).

b. Gradually increase

the

operating time

on

battery

power

up

to

30

seconds, edjusting R4 each time. You should

be

able

to

get

an accuracy

of

within

one

second per

minute

.

c. If

you

have a frequency COunter

you

can adjust R4 so

that

D1

ii

at

1.05KHz for

60Hz

operation

and

at

875Hz

for 50Hz.

oper

-

ation

. (This should also

be

done

on

battery

power

on

l

y)

.

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TES:

The components con

ta

ined in each option are as follows:

1.

Bl

ink

ing

Colons and PM indicat

or

- RS,

R1

3 th

ru

R16,

UI

S•

tl

-L-

■

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ti

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,

.....

•

CR6 th

ru

C

R1

2and

03.

2. Battery

Ba

ck u

p-8

1.5V Batteries, CR4, CR5.

3. Zero Suppress

D1

-R20, R21 and

02.

4.

24

H

ou

r Ope

ra

tion- CR21.

5. 50Hz Operation- CR

22

.

u,

...

f

c_l_.!I

SS

o=::,

ISMl/,.,..tl

PU

II

1/l

r--.._.,.

I

...

-

-aa••

s

:

I~

,,

'

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i,

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.

Cll~

Sf

_

__

'

I

'

""

I

d'

,.

I

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Cl?!_

SJ~~H

I

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CIII

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~

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1111

-

11

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FIGURE 5. INTERCONNECT

DIAGRAM

n

~l1

'1r1ta.

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SNOOZE

0

MIN

/

DAY

0

HR

IMO

0

MODE

SLEEP

@Bo

TH

RAD

IO

RUN COUNTE

. SET

CAL

(Q)

SELECT

SET

CLOCK

SET

ALARM

SET

RADIO /

RUN

FIGURE 6. BACK PANEL

RADIO SHACK IA TANDY CORPORATION COMPANY

U.S.A

.:

FORT WORTH. TEXAS 76107

CANADA:

BARRIE

. ONTARIO. CANADA L4M

4W5

PRINTED IN USA

I . r

v--

1\

v

/,

\,

\

\'

,,.-

, r

.( ]

\ {

,

('

r

.,

/

.,,

/

I ) '

..

I

I I

)'

TROUBLESHOOTING

CHART

3.

One

digit

not

lighted.

Note:

A. Cold solder joints

on

one

lead

from

Digit

Driver

to

Display

board.

SYMPTOMS

1.

One

segments

not

Iighted

on

display,

2.

One

segment

not

lighted

on

all

displays.

\

f_.,

\

.,

, (

r I

.,,

POSSIB

LE

CAUSE

A. Cold solder joints

on

jumper

leads.

B.

Copper

lands c

racked

or

broken.

A. Cold solder

joinu

on

lead

from

PC

board

to

Display

board.

B. Cold solder

joints

at

Clock/

Cal

endar

IC

or

at

Segment

Driver.

Look for cracked

or

broken cop-

per

lands.

C.

Switch

Segment

Driver IC's.

If

blanked

segment

shows

up

in

a different PoSition, replace de-

fective

driver

.

I

Digit

D1

will

only

light

up

i

t'

there

is

a 1

or

a 2 present.

4.

Colons

do

not

blink

in

the

Run

mode

.

5.

One,

or

more, Display

lune

•

tions

(Set Clock,

Set

Cal, etc.I

does

n

ot

work.

B. Cold solder

joints

at

Clock/

Calendar IC

or

at

Digit

Driver.

Look

for

cracked

or

broken

copper

lands.

A. Polarity

of

LED's

on

Di•p

l

ay

board is reversed.

B.

Cold S0lder joints

on:

LED's,

jumper

leads, Clock/Calendar

IC-

pins

13

, 14,

and

28

-S

egment

Driver

and

associated components

(transistors, resistors, etc.}.

C.

Copper

lands c

racked

or

broken.

A.

With

a voltmeter

on

ohms

scale,

check

1

N914

diodes

for

good

front

to

back

r

at

io

(high

resistance-anode

to

cathode. low

resistance-cathode

to

anode.

AUSTRALIA

TANDY CORPORATION

BELGIUM

U K

280

-

316

VICTORIA

ROAD

RYOAL

M

ERE

.

NS

W

2116

PARC

INDUSTRIEL

DE

NANINNE

5140

NAN

I

NN

E

BILSTON

ROAD

WEDNESBURY.

STAFFS

WF

IO

7JN

990-0348

Radio Shack project-board Series User manual

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