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"

D

D

!L

GC-1005

Electronic

Clock

Copyright

01972

Heath

Company

All

rtgha

rwiwtf

PRICE

$2.00

TABLE

OF

CONTENTS

Assembly

and

Operation

of

the

ELECTRONIC

CLOCK

MODEL

GC-1005

Introduction.

2

Parts

List.

2

Assembly

Notes

.

4

Step-by-Step

Assembly

.

5

Cabinet

Top

.15

Cabinet

Bottom.16

Alternate

Line

Voltage

Wiring

.17

Other

Wiring

.17

Decorating

.20

Initial

Tests

.

2

1

Operation

.22

In

Case

of

Difficulty

.23

Troubleshooting

Chart.24

Specifications

.

2

5

Circuit

Fundamentals.26

Chassis

Photograph

.

•.27

Circuit

Board

X-Ray

Views

.28

Circuit

Board

Voltage

Charts

.30

Identification

Chart.31

Schematic..

.(fold-out

from

page)

.31

Warranty.Inside

front

cover

Customer

Service.Inside

rear

cover

HEATH

COMPANY

BENTON

HARBOR.

MICHIGAN

49022

INTRODUCTION

The

Heathkit

Model

GC-1005

digital

Electronic

Clock

has

many

attractive

features,

including:

a

wiring

option

that

lets

it

display

either

12-hour

or

24-hour

time;

an

AM-PM

alarm

with

snooze

alarm;

a

6-digit,

easy-to-read

display;

a

power

interruption

indication;

a

50

or

60

Hz

wiring

option;

and

a

120-volt

or

240-volt

wiring

option.

The

heart

of

the

Clock

is

an

MOS/LSI

*

integrated

circuit

that

performs

all

the

logic

functions

of

keeping

time.

A

simple

wiring

option

lets

your

Clock

display

either

12-hour

or

24-hour

time.

The

clock

"knows"

the

difference

between

AM

and

PM

and

will

only

sound

the

alarm

for

the

one

time

(either

AM

or

PM,

but

not

both)

in

24

hours

that

you

desire.

The

snooze

alarm

waits

approximately

seven

minutes

each

time

it

is

reset,

until

it

sounds

again.

'MOS/LSI

(Metal

Oxide

Semiconductor/Large

Scale

Integration)

The

readout

tubes

clearly

display

the

time

on

a

sloped

surface,

and

the

6-digit

display

shows

ail

8's

if

there

is

a

significant

power

line

interruption.

The

Clock

can

be

wired

to

operate

from

either

a

50

Hz

or

a

60

Hz

power

line,

or

120

volts

or

240

volts

AC.

Attractive,

modern

styling;

small

size;

and

solid-state

dependability

make

this

Clock

ideally

suited

for

your

office,

your

home,

or

almost

anywhere.

Refer

to

the

"Kit

Builders

Guide"

for

complete

information

on

unpacking,

parts

identification,

tools,

wiring,

soldering,

and

step-by-step

assembly

procedures.

PARTS

LIST

Check

each

part

against

the

following

list.

The

key

numbers

correspond

to

the

numbers

in

the

Parts

Pictorial

(fold-out

from

Page

5).

Any

part

that

is

packaged

in

an

individual

envelope

with

the

part

number

on

it

should

be

placed

back

in

the

envelope

after

it

is

identified

until

it

is

called

for

in

a

step.

CAUTION:

The

integrated

circuit

(#443-601)

can

be

damaged

by

static

voltage.

Do

not

handle

it

until

you

are

told

to

do

so.

To

order

a

replacement

part,

use

the

Parts

Order

Form

furnished

with

this

kit.

If

a

Parts

Order

Form

is

not

available,

refer

to

"Replacement

Parts"

inside

the

rear

cover

of

the

Manual.

KEY

PART

PARTS

DESCRIPTION

PRICE

No.

No.

Per

Kit

_

Each

RESISTORS

NOTE:

Each

of

the

following

resistors

has

a

10%

tolerance

unless

otherwise

noted.

10%

is

indicated

by

a

silver

fourth

color

band,

while

5%

is

indicated

by

a

gold

band.

1/4-Watt

A1

146-12

/

27

kft

(red-violet-

orange)

.10

A1

1-12-12

0

82

kft

(gray-red-

orange)

.10

A1

1-90-12

r)

91

kft,

5%

(white-brown-

orange)

.10

A1

1-32

12

0

100

kft

(brown-black-

yellow)

.10

A1

1-16-12

<9

180

kft

(brown-gray-

yellow)

.10

KEY

PART

PARTS

DESCRIPTION

PRICE

No.

No.

Per

Kit

Each

1/2-Watt

n

A2

1-45

220

ft

(red-red-brown)

JO

A2

1-13

ft)

2700

ft

(red-violet-red)

.10

A2

1-114

8200

ft,

5%

(gray-red-

.20

A2

1-109

©

0

red)

12

kft,

5%

(brown-

red-orange)

.20

A2

1-162

15

kft,

5%

(brown-

green-orange)

.10

©

A2

1-22

22

kft

(red-red-

orange)

.10

©

A2

1-23

27

kft

(red-violet-

orange)

.10

©

<3

A2

147

56

kft

(green

blue-

orange)

.10

A2

1-121

120

kft

(brown-red-

yellow)

.10

KEY

PART

PARTS

DESCRIPTION

PRICE

No.

No.

Per

Kit

Each

Resistors

(cont'dJ^.

A2

1-30

270

kS2

(red-violet-

.10

A2

1-33

<D

yellow)

470

kI2

(yellow-violet-

.10

A2

1-35

CD

yellow)

1

MS3

(brown-black-

green)

.10

CAPACITORS

A3

20-100

30

pF

mica

.20

A4

21-163

&

.001

fi

F

disc

.10

A5

27-63

a)

.022

mF

Mylar*

.10

A6

25-30

X

Dual

20

juF

electrolytic

1.00

A7

25-241

S>

1200

*iF

electrolytic

.90

DIODES

B1

56-25

i

1N4166A

zener

1.00

B1

56-56

8

1N4149

.20

B1

57-27

1

1N2071

.50

B1

57-65

2

1N4002

.20

TRANSISTORS-INTEGRATED

CIRCUIT

NOTE:

Transistors

and

integrated

circuits

are

marked

for

identification

in

one

of

the

following

four

ways:

1.

Part

number.

2.

Type

number.

(In

integrated

circuits

this

refers

only

to

the

numbers:

the

letters

may

vary.)

3.

Part

number

and

type

number.

4.

Part

number

with

a

type

number

other

than

the

one

listed.

B2

417-811

7

MPS-L01

transistor

.40

B2

417-295

6

MPS-L51

transistor

.50

B2

417-801

8

MPS-A20

transistor

.20

B3

443-601

<D

MK5017AA

integrated

15.00

circuit

SWITCH

ESI

NSULATORS

B4

60-1

SPST

switch

.20

60-6

q)

SPST

switch

with

spring

.30

return

B5

60-2

©

DPDT

switch

.30

B6

75-52

Switch

insulator

.10

B7

75-103

Fish

paper.

5-1/2"

x

1-7/8'

’*

10

B8

75-93

CD

Fish

paper,

1"

x

1"

.10

B9

75-138

fa)

Rubber

foot

.10

CORD-WIRE-CABLE

8944

(3^

Line

cord

.55

*

Du

Pont

Registered

Trademark

KEY

PART

PARTS

DESCRIPTION

No.

No.

Per

Kit

Cord-Wire-Cable

(cont'd.)

340-11

©

Bare

wire

(used

only

O

for

soldering

iron

tip)

344-50

Black

wire

347-55

0

8-wire

cable

HARDWARE

Cl

250420

7

2-32

x

1/4"

self-tapping

screw

C2

250-52

3

440

x

1/4"

screw

C3

252-2

3

440

nut

C4

254-9

3

#4

lockwasher

C5

250-276

12

6-32

x

3/8"

flat

head

screw

C6

250-381

2

6-32

x

3/8"

black

screw

250-89

1

6-32

x

3/8"

screw

C7

250-1156

4

6-20

x

2-1/4”

self¬

tapping

screw

C8

252-3

3

6-32

nut

C9

253-60

2

#6

flat

washer

CIO

254-1

5

#6

lockwasher

C11

259-1

6

#6

solder

lug

CIRCUIT

BO

ARDS-CABINET-LAB

ELS

85-1239-3

Q

Main

circuit

board

85-1240-2

vn

Display

circuit

board

D1

92-77

Cabinet

top

D2

92-78

Cabinet

bottom

D3

390-341

Heathkit

label

390-362

(n

Fuse

label

390-926

Cord

disconnect

label

390-995

O

Wood-grain

trim

391-34

©

Blue

and

white

label

MISCELLANEOUS

54-820

<D

Power

transformer

El

204-1876

Angle

bracket

E2

205-141

Tool

plate

E3

258-167

©

Speaker

clamp

E4

346-6

q)

Sleeving

E5

401-163

vu

Speaker

E6

411-286

(

y

Display

tube

E7

412-11

cp

Neon

lamp

E8

42140

<J>

3/16-ampere

slow-blow

fuse

E9

43143

Terminal

strip

E10

432-134

56'

Connector

pin

Ell

432-144

©

Integrated

circuit

(1C)

connector

El

2

432-199

(5

Wire

nut

PRICE

Each

.05/ft

.05/ft

.

25/ft

.05

.05

.05

.05

.05

.05

.05

.10

.05

.05

.05

.05

1.65

.85

1.20

1.10

.10

.10

.15

.40

4.60

.15

.10

.05

.05

1.40

5.00

.20

.40

.10

.10

.01

.10

KEY

PART

PARTS

DESCRIPTION

PRICE

No,

No.

Per

Kit

Each

Miscellaneous

E13

446-609

490-5

597-260

597-308

The

prices

apply

only

on

purchases

from

the

Heath

Company

where

shipment

is

to

a

U.S.A.

destination.

Add

10%

(minimum

25

cents)

to

the

price

when

ordering

from

a

Heathkit

Electronic

Center

to

cover

local

sales

tax,

postage,

and

handling.

Outside

the

U.S.A.,

parts

and

service

are

available

from

your

local

Heathkit

source

and

will

reflect

additional

transportation,

taxes,

duties,

and

rates

of

exchange.

(cont'd.)

Window

1.20

Nut

starter

.10

Parts

Order

Form

Kit

Builders

Guide

Manual

(See

front

cover

2,00

for

part

number.)

Solder

(Additional

6'

rolls

of

solder,

#331-13,

can

be

ordered

for

25

cents

each.)

ASSEMBLY

1.

Before

you

start

to

assemble

this

kit,

read

the

wiring,

soldering,

and

step-by-step

assembly

information

in

the

"Kit

Builders

Guide."

2.

Due

to

the

small

foil

area

around

the

circuit

board

holes

and

the

small

areas

between

foils,

it

will

be

necessary

to

use

the

utmost

care

to

prevent

solder

bridges

between

adjacent

foil

areas.

Use

only

a

minimum

amount

of

solder

and

use

no

larger

than

a

25-watt

soldering

iron

with

a

small

tip.

Allow

it

to

reach

operating

temperature,

and

then

apply

it

only

long

enough

to

make

a

good

solder

connection.

3.

I

f

a

small

wattage,

small-tip

soldering

iron

is

not

available,

proceed

as

follows:

Be

sure

your

soldering

iron

is

cool.

Wrap

the

large

bare

wire

(supplied)

tightly

around

the

soldering

iron

tip

as

shown

in

Figure

1.

Allow

approximately

1/4"

of

wire

to

extend

beyond

the

end

of

the

soldering

iron.

Cut

the

wire

end

to

a

NOTES

chisel

shape

as

shown.

Occasionally

apply

solder

to

the

turns

of

large

bare

wire

to

achieve

a

good

heat

transfer.

4.

Resistors

will

be

called

out

by

their

resistance

value

in

n,

kfi,

or

MJ2,

and

color

code.

5.

Capacitors

will

be

called

out

by

their

capacitance

value

(in

pF

or

u

F)

and

type

(disc,

mica,

Mylar,

or

electrolytic).

Page

21

Refer

to

Figure

2

(fold-out

from

Page

23)

to

identify

the

function

of

each

switch.

NOTE:

If

you

do

not

obtain

the

proper

results

in

any

of

the

following

steps,

unplug

the

line

cord

plug

and

proceed

to

the

"In

Case

of

Difficulty"

section

on

Page

22.

(

)

Set

the

six

switches

to

the

positions

shown.

(

)

Plug

the

line

cord

plug

into

an

AC

outlet.

Each

of

the

six

display

digits

should

indicate

an

eight.

(

)

Push

the

TIME

HOLD

switch

to

the

right

and

back

again.

The

display

should

now

indicate

12:00:00

or

00:00:00

and

start

keeping

time.

(

)

Push

the

Alarm

Set

switch

to

the

right.

The

display

should

now

indicate

12:00:00

or

00:00:00

and

the

AM-PM

lamp

should

be

on.

<

)

Push

and

hold

the

HOURS

SET

AHEAD

switch

to

the

right.

The

HOURS

DISPLAY

will

now

advance

one

digit

each

half

second.

The

AM-PM

lamp

will

turn

on

and

off

each

six

seconds.

(

)

Release

the

HOURS

SET-AHEAD

switch.

{

)

Push

and

hold

the

MINUTES

SET-AHEAD

switch

to

the

right.

The

MINUTES

DISPLAY

will

now

advance

one

digit

each

half

second.

(

)

Push

both

the

MINUTES

SET

AHEAD

switch

and

the

HOURS

SET-AHEAD

switch

to

the

right.

The

tens

of

minutes

will

now

advance

one

digit

each

half

second.

(

)

Push

the

MINUTES

and

HOURS

SET-AHEAD

switches

as

necessary

until

the

MINUTES

DISPLAY

indicates

45

minutes;

then

quickly

release

the

MINUTES

SET-AHEAD

switch.

Continue

holding

the

HOURS

SET-AHEAD

switch

until

the

HOURS

DISPLAY

indicates

6

and

the

AM-PM

lamp

is

on

(indicating

AM).

Then

quickly

release

the

switch.

(

)

Push

the

ALARM

SET

switch

to

the

left.

{

)

Push

the

ALARM

ON-OFF

switch

to

the

ON

(down)

position.

(

)

Push

the

TIME

HOLD

switch

to

the

right.

(

)

Push

both

the

HOURS

SET-AHEAD

switch

and

the

MINUTES

SET-AHEAD

switch

to

the

right

as

necessary

until

the

MINUTES

DISPLAY

indicates

44

minutes.

Then

quickly

release

the

MINUTES

SET-AHEAD

switch.

(

)

Continue

holding

the

HOURS

SET-AHEAD

switch

until

the

HOURS

DISPLAY

indicates

6

and

the

AM-PM

lamp

is

on

(indicating

AM).

Then

quickly

release

the

switch.

(

}

Push

the

TIME

HOLD

switch

to

the

left.

The

clock

should

now

start

keeping

time

and

in

approximately

one

minute

the

alarm

should

sound.

(

)

When

the

alarm

sounds,

push

the

SNOOZE

ALARM

switch

down

(to

reset

the

snooze

alarm)

and

release

the

switch.

In

approximately

seven

minutes,

the

alarm

should

sound

again.

(

)

Push

the

ALARM

ON-OFF

switch

up

to

the

OFF

position.

This

completes

the

"Initial

Tests."

INITIAL

TESTS

<

)

OPERATION

Figure

2

(fold-out

from

Page

23)

points

out

the

switches

and

displays

of

your

Clock.

These

switches

and

displays

are

further

described

below.

1.

ALARM

ON-OFF

SWITCH

-

Turns

the

alarm

on

and

off.

Down

is

on.

NOTE:

After

the

alarm

sounds,

if

you

wish,

you

may

turn

the

alarm

off

and

immediately

return

the

switch

to

the

ON

position.

The

alarm

will

then

sound

24

hours

later.

2.

SNOOZE

ALARM

SWITCH

-

Resets

the

alarm

to

go

off

seven

minutes

later.

3.

HOURS

SET-AHEAD

SWITCH

-

Advances

the

HOURS

DISPLAY

one

hour

each

half

second.

4.

MINUTES

SET-AHEAD

SWITCH

-

Advances

the

MINUTES

DISPLAY

one

minute

each

half

second.

3

and

4.

When

used

together,

they

advance

the

MINUTES

DISPLAY

ten

minutes

each

half

second.

5.

ALARM

SET

SWITCH

—

Allows

you

to

set

the

alarm

using

the

HOURS

and

MINUTES

SET-AHEAD

switches.

Also

allows

the

display

to

indicate

the

time

for

which

the

alarm

is

set.

(Time

continues

to

be

kept

even

though

it

is

not

displayed

when

this

switch

is

being

used.)

6.

TIME

HOLD

SWITCH

—

Allows

you

to

set

the

Clock

ahead

to

the

desired

time,

using

the

HOURS

and

MINUTES

SET-AHEAD

switches,

and

then

start

the

clock

when

the

desired

time

arrives.

7.

AM-PM

LAMP

—

Indicates

AM

when

on

and

PM

when

off;

only

when

setting

the

alarm

or

the

time.

The

Lamp

is

not

on

during

normal

operation.

8,9,

and

10.

HOURS,

MINUTES,

and

SECONDS

DISPLAY

—

Indicate

the

time

or

the

time

that

the

alarm

is

set

for.

Indicates

all

8's

when

first

plugged

in

or

when

power

has

been

interrupted

for

several

seconds.

TO

SET

THE

TIME:

1.

Push

the

TIME

HOLD

switch

to

the

right.

2.

Push

the

MINUTES

SET-AHEAD

and

HOURS

SET-AHEAD

switches

(separately

or

together)

as

necessary

to

advance

the

display

to

a

desired

time.

Be

sure

the

AM-PM

lamp

is

on

or

off

as

desired

—

on

is

AM;

off

is

PM.

3.

Watch

another

clock.

When

the

time

gets

to

the

time

on

the

display,

push

the

TIME

HOLD

switch

to

the

left.

TO

SET

THE

ALARM:

1.

Push

the

ALARM-SET

switch

to

the

right.

(The

clock

will

continue

to

keep

time,

even

though

the

display

is

stationary.)

2.

Push

the

MINUTES

SET-AHEAD

and

HOURS

SET-AHEAD

switches

(separately

or

together)

as

necessary

to

advance

the

display

to

a

desired

time.

Be

sure

the

AM-PM

lamp

is

on

or

off

as

desired

-

on

is

AM;

off

is

PM.

3.

Push

the

ALARM-SET

switch

to

the

left.

4.

Push

the

ALARM

ON-OFF

switch

down

to

the

ON

position.

FOR

DAYLIGHT

SAVINGS

TIME:

1.

Push

the

HOURS

SET-AHEAD

switch

to

the

right

and

advance

the

HOURS

DISPLAY

to

the

desired

hour.

NOTE:

To

go

back

an

hour,

advance

the

display

23

hours.

IN

CASE

OF

DIFFICULTY

This

section

of

the

Manual

is

divided

into

two

parts.

The

first

part,

titled

"General

Troubleshooting

Information,"

describes

what

to

do

about

the

difficulties

that

may

occur

right

after

your

Clock

is

assembled.

The

second

part,

titled

"Troubleshooting

Chart,”

is

provided

to

assist

you

in

servicing

the

Clock

if

the

"General

Troubleshooting

Information"

fails

to

clear

up

the

problem,

or

if

difficulties

occur

after

your

Clock

has

been

in

use

for

some

time.

The

"Troubleshooting

Chart"

lists

a

number

of

possible

difficulties

that

could

arise

along

with

several

possible

solutions

to

those

difficulties.

Try

to

analyze

the

symptoms

of

any

problem

you

might

have

before

starting

any

troubleshooting

procedure.

This

can

usually

be

accomplished

by

trying

the

various

functions

of

your

Clock

to

determine

abnormal

operations.

A

review

of

the

"Operation"

section

above

may

help

your

analysis.

NOTE:

Refer

to

the

"Circuit

Board

X-Ray

Views"

on

Pages

28

and

29

for

the

physical

location

of

parts

on

the

circuit

boards.

GENERAL

TROUBLESHOOTING

INFORMATION

1.

Check

all

the

wires

that

are

connected

between

the

two

circuit

boards

and

between

the

circuit

boards

and

other

parts.

Trace

each

wire

in

colored

pencil

on

the

Pictorial

as

it

is

checked.

Make

sure

these

wires

are

connected

to

the

proper

points

and

are

properly

soldered.

Someone

who

is

not

familiar

with

the

unit

may

notice

something

you

have

consistently

overlooked.

2.

Be

sure

the

1C

is

seated

properly

in

its

socket.

3.

About

90%

of

the

kits

that

are

returned

for

repair

do

not

function

properly

because

of

poor

connections

and

soldering.

Therefore,

many

troubles

can

be

located

by

a

careful

inspection

of

connections

to

make

sure

they

are

soldered

as

described

in

the

"Soldering"

section

of

the

"Kit

Builders

Guide."

Reheat

any

doubtful

connections.

4.

Closely

examine

each

circuit

board

foil

in

a

good

light

to

see

that

no

solder

bridges

exist

between

adjacent

connections.

If

available,

a

magnifying

glass

would

be

helpful

for

this

purpose.

Remove

any

solder

bridges

by

holding

a

clean,

hot

soldering

iron

tip

between

the

two

points

that

are

bridged

until

the

excess

solder

flows

down

onto

the

tip.

Compare

your

foil

pattern

against

the

"X-Ray

Views"

on

Pages

28

and

29.

5.

Be

sure

each

transistor

is

in

its

proper

location

(correct

part

number

and/or

type

number).

Be

sure

that

each

transistor

lead

is

in

the

right

hole

and

has

a

good

solder

connection

to

the

foil.

6.

Check

the

integrated

circuit

for

proper

positioning.

(Be

sure

the

dot

or

notched

end

of

the

1C

is

over

the

half

dot

printed

on

the

circuit

board.)

7.

Check

each

capacitor

value.

Be

sure

that

a

capacitor

of

correct

value

is

installed

at

each

capacitor

location.

Check

each

electrolytic

capacitor

to

be

sure

the

lead

near

the

positive

(+)

marking

is

at

the

correct

position.

8.

Check

each

resistor

value

carefully.

It

would

be

easy,

for

example,

to

install

a

2200

ft

(red-red-red)

resistor

where

a

22

kft

(red-red-orange)

resistor

is

called

for.

A

resistor

that

is

discolored,

or

cracked,

or

shows

any

sign

of

bulging

would

indicate

that

it

is

damaged

and

should

be

replaced.

Since

damaged

resistors

are

often

the

result

of

some

other

difficulty

(such

as

faulty

wiring),

you

should

try

to

find

out

what

caused

the

damage

before

you

replace

the

part.

9.

Be

sure

the

correct

diode

is

installed

at

each

diode

location,

and

that

the

banded

end

is

positioned

correctly.

10.

C

heck

all

component

leads

connected

to

the

circuit

boards.

Make

sure

the

leads

do

not

extend

through

the

circuit

board

and

come

in

contact

with

other

connections

or

parts.

If

you

still

cannot

locate

and

correct

the

trouble

after

the

above

tests

are

completed,

and

if

a

voltmeter

is

available,

check

your

Clock's

voltages

against

the

voltages

shown

on

the

Schematic

Diagram

(fold-out

from

Page

31)

and

in

the

"Circuit

Board

Voltage

Charts"

(Page

30).

NOTE:

In

an

extreme

case

where

you

are

unable

to

resolve

a

difficulty,

refer

to

the

"Customer

Service"

information

inside

the

rear

cover

of

the

Manual.

Vour

Warranty

is

located

inside

the

front

cover

of

the

Manual.

(

WARNING:

Hazardous

voltages

are

exposed

in

the

Clock

when

the

cabinet

top

is

removed

and

the

line

cord

is

plugged

into

the

AC

outlet.

See

"Chassis

Photograph

"

on

Page

27.

Figure

2