Heathkit-GC-1005-Manual.pdf

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M°°E`GC-1005 Electronic Clock
H EATH KIT®
Copyright C 1972
Heath Company
All rights reserved
PRICE $2.00
1-595-1500-03
Dear Customer:
The Heathkit electronic product you have purchased is one of the best performing electronic products in the
world.
Here's how we aim to keep it that way:
Your Heathkit Warranty
During your first 90 days of ownership, any parts which we find are defective, either in materials or
workmanship, will be replaced or repaired free of charge. And we'll pay shipping charges to get those parts to
you — anywhere in the world.
If we determine a defective part has caused your Heathkit electronic product to need other repair, through no
fault of yours, we will service it free — at the factory, at any retail Heathkit Electronic Center, or through any of
our authorized overseas distributors.
This protection is exclusively yours as the original purchaser. Naturally, it doesn't cover damage by use of
acid-core solder, incorrect assembly, misuse, fire, flood or acts of God. But, it does insure the performance of
your Heathkit electronic product anywhere in the world — for most any other reason.
After-Warranty Service
What happens after warranty? We won't let you down. If your Heathkit electronic product needs repairs or you
need a part, just write or call the factory, your nearest retail Heathkit Electronic Center, or any Heath
a,uthorized overseas distributor. We maintain an inventory of replacement parts for each Heathkit model at most
locations — even for many models that no longer appear in our current product line-up. Repair service and
technical consultation are available through all locations.
tNe hope you'll never need our repair or replacement services, but it's nice to know you're protected anyway —
and that cheerful help is nearby.
Sincerely,
HEATH COMPANY
Benton Harbor, Michigan 49022
71)
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11
11
1
11
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Assembly
TABLE OF CONTENTS
and
Operation
of the
Introduction
Parts List
Assembly Notes
Step-by-Step Assembly
Cabinet Top
Cabinet Bottom
5
ELECTRONIC CLOCK
MODEL GC-1005
Alternate Line Voltage Wiring
Other Wiring
Decorating
Initial Tests
Operation
In Case of Difficulty
Troubleshooting Chart
Specifications
Circuit Fundamentals
Chassis Photograph
•
15
16
17
17
20
21
22
23
24
25
26
27
28
30
31
31
Circuit Board X-Ray Views
Circuit Board Voltage Charts
Identification Chart
Schematic.. .(fold-out from page)
Inside front cover
Inside rear cover
Warranty
Customer Service
HEATH COMPANY
BENTON HARBOR, MICHIGAN
490 2 2
Page 2
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.
Attractive, modern styling; small size; and solid-state
dependability make this Clock ideally suited for your office,
your home, or almost anywhere.
The readout tubes clearly display the time on a sloped
surface, and the 6-digit display shows all 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.
Refer to the "Kit Builders Guide" for complete information
on unpacking, parts identification, tools, wiring, soldering,
and step-by-step assembly procedures.
*MOS/LSI (Metal Oxide Semiconductor/Large Scale
Integration)
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:
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
No. No.
4
The integrated circuit (#443-601) can be
damaged by static voltage. Do not handle it until you are
PARTS
Per Kit
DESCRIPTION
PRICE
Each
KEY PART
No.
No.
PARTS
Per Kit
DESCRIPTION
PRICE
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.
1/2-Watt
A2
A2
A2
A2
1-45
1-13
1-114
1-109
1-162
1-22
1-23
1-47
1-121
'\ 13
220 S2 (red-red-brown)
2700 S2 (red-violet-red)
8200 2, 5% (gray-red-
red)
12 kS2,
5%
(brown-
red-orange)
15 kS2, 5%
(brown-
green-orange)
22 kS2 (red-red-
orange)
271(2 (red-violet-
orange)
56 k2 (green-blue-
orange)
120 kS2 (brown-red-
yellow)
.10
.10
.20
.20
.10
\J
/2
73
N
I( 1
1 /4-Watt
Al
Al
Al
Al
Al
1-46-12
1-12-12
1-90-12
1-32-12
1-16-12
N
14
\
27 kS2 (red-violet-
orange)
82 k&2 (gray-red-
orange)
91 kS2, 5% (white-brown-
orange)
100 kS2 (brown-black-
yellow)
180 k12 (brown-gray-
yellow)
.10
.10
10
.10
.10
A2
A2
A2
A2
A2
-' , 1
(
4
.10
.10
.10
.10
- 2
Page 3
KEY PART
No.
No.
PARTS
Per Kit
DESCRIPTION
PRICE
Each
KEY PART
No. No.
PARTS
Per Kit
DESCRIPTION
PRICE
Each
Resistors (cont'd.)
A2
A2
A2
1-30
1-33
1-35
-6
6 \I
Cord-Wire-Cable (cont'd.)
270 k&2 (red-violet-
yellow)
470 kS2 (yellow-violet-
yellow)
1 MS-2 (brown-black-
green)
.10
.10
.10
340-11
344-50
347-55
1''v'
1
)\/
Bare wire (used only
for soldering iron tip)
Black wire
8-wire cable
.05/ft
.05/ft
.25/ft
6\
HARDWARE
Cl
250-420
250-52
252-2
254-9
250-276
250-381
250-89
250-1156
252-3
253-60
254-1
259-1
4' ,
7.:
3.
2-32 x 1/4" self-tapping
screw
4-40 x 1/4" screw
4-40 nut
#4 lockwasher
12-
6-32 x 3/8" flat
head screw
6-32 x 3/8" screw
6-20 x 2-1 /4" self-
tapping screw
6-32 nut
#6 flat washer
#6 lockwasher
#6 solder lug
.05
.05
.05
.05
.05
CAPACITORS
A3
A4
A5
A6
A7
20-100
21-163
27-63
25-30
25-241
1
6 \I
1\i
1
1\/
30 pF mica
.001 pF disc
.022 pF Mylar *
Dual 204F electrolytic
1200 pcF electrolytic
.20
.10
.10
1.00
.90
C2
C3
C4
C5
C6
6-32 x 3/8" black screw .05
.05
.10
.05
.05
.05
.05
DIODES
B1
B1
B1
B1
56-25
56-56
57-27
57-65
`1 1
\18
1
1N4166A zener
1N4149
1N2071
1N4002
1.00
.20
.50
.20
C7
C8
C9
C10
C11
2--
6-
TRANSISTORS-INTEGRATED CIRCUIT
NOTE: Transistors and integrated circuits are marked for
identification in one of the following four ways:
1.
2.
3.
4.
CIRCUIT BOARDS-CABINET-LABELS
85-1239-3
85-1240-2
D1
D2
D3
1.,
92-77
1
1
92-78
390-341 *I 1
- 1
390-362
1
390-926
390-995
391-34
1
Main circuit
board
Display circuit board
Cabinet top
Cabinet bottom
Heathkit label
Fuse label
Part number.
Type number. (In integrated circuits this refers
only to the numbers; the letters may vary.)
Part number and type number.
Part number with a type number other than the
one listed.
1.65
.85
1.20
1.10
.10
.10
.15
.40
B2 417-811
t'
MPS-L01
transistor
MPS-L51
transistor
.40
.50
.20
15.00
Cord disconnect label
Wood-grain trim
Blue and white label
B2 417-295
6\,
B2 417-801
(2
g`i
B3 443-601
N
MPS-A20 transistor
MK5017AA integrated
circuit
MISCELLANEOUS
54-820 N 1
El 204-1876 "2
E2 205-141
2
E3 258-167
2
E4 346-6
‘‘i 1
E5
401-163
-
v 1
E6 411-286 .N3
E7 412-11 \ 1
E8 421-40
E9 431-43
Nv
1
El0 432-134 \
1
56
El 1 432-144 24
SWITCHES-INSULATORS
B4
60-1
0
-I-,
6
'7
Power transformer
Angle bracket
4.60
.15
.10
.05
.05
1.40
5.00
.20
.40
.10
.10
.01
.10
SPST switch
SPST switch with spring
return
DPDT switch
Switch insulator
Fish paper, 5-1/2"
x
1-7/8"
Fish paper, 1" x 1"
Rubber foot
.20
.30
.30
.10
.10
.10
.10
Tool plate
Speaker clamp
Sleeving
Speaker
Display tube
Neon lamp
3/16-ampere slow-blow
fuse
Terminal strip
Connector pin
Integrated circuit
(IC) connector
Wire nut
60-6
B5
B6
B7
B8
B9
60-2
75-52
75-103
75-93
75-138
3
2'N
6\,
1\/
‘t
- 4N
CORD-WIRE-CABLE
89-44
1
N
Line cord
.55
7
*DuPont Registered Trademark
E12 432-199

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