Heathkit GC 1000 H Manual

Page 2

-A'IIIIII II IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIHIIII

HEATH COMPANY PHONE DIRECTORY

The tollowing telephone numbers are direct lines to the de-
partments listed:

Kit orders and delivery information ....... Sta-9824411
Credit tttttttt t ...... . , . 616-982-3561
Replacement Parts t . 616-9l2-3571

Technical Assistance Phone Numbers
(8:00 AM to 4:30 PM. Eastern Time. Weekdays Only)

\
Education Products ........ . t t . . . ,,,,,, 616-982-3980
Amateur Radio ........................ 616-082-3296
Test Equipment, Weather Instruments.

Clocks .................. .,....... 616-982-3315
Television ........................... 616-982-3307
Home Products. Stereo. Security. Telephone.

Marine, Automotive ................ BIS-0824496
Computer - Hardware ................. 616-902-3309

QWUWMMWWW

YOUR HEATHKIT 1 YEAR LIMITED WARRANTY
Consumer Protection Plan for Heathltit Consumer Products

Welcome to the Heath Ilmll We belleve you wll| enloy easemhilnalyour tilt and will be pleased with Its pertormance
Please read this Consumer Mentor! Plan caretully. II I: a 'LIMIT WARRANTV' I! GIVING In the U 5 Consumer
Product Warranty and Federal Trade Commission improvement Am Thie warranty gives you epecrtic legal rights.
end you may also have other nghle which vary trorn state to state

Heeth'a Responsibility

PARTS 7 Replacements lor taciury detective its wIIl be supplied tree tor 1 year trorn date at purchase Replacement pans are
warranted tor the lemeini portion or the net warranty period. You can obtain warranty parts direct lrornHeeth Company by
writing or telephoning us all l6) 882-3571 And we will pay shipping charges u; get those pans to you anywhere In the world
SERVICE LABOR - For a perlod or t year iron the date or purchase, any mallunction caused by detective its or materials
will be corrected at no charge to you irou must deliver the urirl at your expense to the Heath rectory. any Heath will Computers
and Electronics center (unu or Verltechnoloqy Electronlcs Corporation). or any at our authorized oversees distributors

TECHNICAL CONSULTATION - You will receive tree consultation on any problem you mtgnt encounter in the assemoty or use
at our Honlhkll product Just drop us a line or give us a call Sorry. we cannot accept collect oalle

NOT COVERED - The correction ol assembly errors. adjustments. calibration. and damage due to misuse, abuse. or negligence
are not covered by the warranty use at corrosive solder and/or the unauthorized modification ot the product or at any lumlsheo
component will void this warranty In its entirety This warranty does not include reimbursement tor Incorwenienoe, loss oi use. customer
assembly. set-up time. or unauthorized service.

This warranty covers only Heath products and is not extended to other eolllrprnent or components that a customer uses in conjunction
with our products

SUCH REPAIR AND REPLACEMENT SHALL BE THE SOLE RENEDV OF THE CUSTOMER AND THEN! SHALL IE NO UAIIUTV
ON THE PART OF HEATH FOR ANY SPECIAL. INDIRECT. INCIDENTAL OR CONSEQUENTIAL DAMAGES. INCLUDING BUT
NOT UNITED TO ANY LOSS OF BUSINESS OH PROFITS. WHETHER OR NOT FOIESEEAILE.

Some states no not allow the allusion or limitation or mmal or consequential damages. so the above Initiation or exclusion
may not apply to you
Owner's Responsibility

EFFECTIVE wannarl'rv oars - Warranty begins on the date oi lirsl consumer purcriaee. You must supply a copy or your prool
ol purchase when you request warranty semoe orparts

ASSEMBLY - Beiore seeking warranty servtoe. you should complete the assembly by ceretully lollowtng the manual instructions
Heelhltit service agerlciee cannot complete assembly and adjustments that are customers Way
ACCESSORV EQUIPMENT - Pertormance malfunctions involving other non~Heetn accessory equipment (antennae. audio compo
nenrs. computer peripherals and sonwere. etc i are not covered by this warranty and are the owners responsibility
SHIPPING UNITS - Follow the packing lnalmctlona published in the assembly manuals. Damage due to inadequate packing cannot
be repaired under warranty

II you Ir. not satisfied VIIIh our service (warranty 0' otherwise) or our products. write to our Director OI Customer

Servn'lfe. Heath Company. Benton Her MI .9022 He will make urIlIrl your problems receive immedlale. WI]
ahe inn.

10-1-87

llllltlllllllll II IIIIIIIIIIIIIIIIIHIIIIIIIIIIIIHIIIIIIII

INN IIIIHIIIIIIIIIIIHII

Page 20

Page 18

Heathkit

ML

NOTE: When you install the large and
small 7»segment LEDs in their soak-
ets. check very carefully to make sure
that all at the pins are straight and
in line Willi each other, If you bend
a pin over accidentallv. you may
break it off when you try to straighten
it again. Position each LED with the
decimals as shown with the pins
started into their holes. Check In
make sure they are going into the
holes properly. Then push the LED
the rest of the way into the socket,

DECIMAL
POINT

LARGE
LED
DISPLAY

Install four large 7-segment LEDs
[#4114360] into the 1C sockets as fol-
lows:

I ) Vltlt

l ) V102

l ) V103

(lVlO-t

Install three small 7-segment LEDs
[#4113641 into the IC sockets as fol-
lows. Do not use the two holes at the
ends otthe socket.

DECIMAL

SMALL LEO
PO'Nl Wampum

D0 N01 USE

rm) HOLES llu Do Not use

END HOLES

NOTE: The pin 1 end of inline inte-
grated circuit may be marked in a

number of ways; wit
triangle. dot. the number

Ioltl

l
IIIIIIIHOI

h a notch.

1, etc.

DI"
/

m t m t m l
mu "my .
( )V105 ..................... V % 7 ii)
V [)6 .....................
l l 1 "'1 "H Detail l-GB
( 1V107 ....................

PICTORIAL 1-6

CAUTION: When you install the folv

lowing protected [(2 [mounted on a
foam pad). be sure it does not get
damaged by static electricity. Once
you remove the foam pad. DO NOT
let go of the 10 Install it as follows.
Read the entire step before you pick
upthelC.

L Pick up the IC and touch the
foam pad with both hands.

2. Hold the [C with one hand
and remove the foam pad
with the other hand.

3. Refer to Detail t-BA and
continue to hold the [C with
one hand and roll the [(2
pins onto a flat surface to
make sure they are parallel.

4. Pick up the circuit board in
your other hand.

5. See Detail 1-68 and align
the pin 1 end of the [C with
the index mark on the cir-
cuitboard.

6. Then push the 1C pins into
the IC socket. Once in the
socket, the IC is protected.

( ] U101: MC14543 integrated cir-
cull[#443-93l].

-\

Should it ever become necessary to
remove an lC. use the IC puller. Insert
the [C puller beneath the IC: then
gently rock it hack and forth to lift
the 1C

a
@3339 §/
[70 \
xgfif
~ E? M

Page 21

Heathkit

Pagets

m-

( ) Turn the circuit board over so
the foil side Incas up for the next
step only.

[ ) XtOt:25-pin connector. Position
the connector over the edge of
the circuit board. Then insert the
pins into the circuit board and
solder them to the component
side foils.

25 - P | N

CONNECTOR

( ) Press a polarizing pin into 25-
pin connector hole 3 as shown
on the circuit board. Disrewd
any numbers stamped on the
connector.

COMPONENT

. 669;}
c{/
25 PW POLARIZING
CONNECTOR PIN

PICTORIAL 1-7

Page 22

Pagezo

Heathkit

DISPLAY
CIRCUIT BOARD
-

PICTORIAL 1-8

Refer to Pictorial 1-8 for the following steps.
( ) Position the display circuit board as shown.

NOTE: Use the plastic nut starter to hold and start M3 and
M35 nuts on screws.

( ) Mount angle brackets at C and D with M3 x 6 mm
screws, M3 lockwashers. and M3 nuts. Mount the
shorter side of each bracket to the circuit board and
position the brackets as shown.

CIRCUIT BOARD CHECKOUT

Carefully inspect the circuit board for the following
conditions

( ) Unsoldered connections.

( ) Poor solder connections.

[ ] Solder bridges between foil patterns.

( ) Protruding leads which could touch together.

[ ) Transistors for the proper type and installa-
tion.

( ) Electrolytic capacitor for the correct position
of the positive [+ ) and negative (-) lead.

( ] Integrated circuit and LEDs for the proper in-
stallation.

This completes the Display Circuit Board Assem-
bly." Set it aside until it is called for later.

Page 35

Heathkit

P159933

NOTE: You will install IC sockets in the
following steps. Make sure all pins are
straight and insert the socket pins into the
circuit board holes. Turn the circuit bond
over. be sure there is I pin in uch of the
holes. and that «older two dingonll corner
pins of the IC socket to the foil. Greek to
m-ke sure the IC socket is flat nglinst the
circuit board; then solder the remaining
pins to the foil. If the socket is indexed.
position the index tnlrk over the index
outline on the board

( ) 24-pin lC socket at U205.

( ) 40-pin 1C socket :1U203.

( ) 16-pin IC socket at U204.

Carefully check each socket for solder
bridges betweut pins. If I solder bridge
has occurred, hold the circuit board foil-
side-down as shown. and hold the solder-
ing iron tip baween the two points that
Ire bridged. The solder will flow down
the soldering iron tip.

Ic
ClRCUIT 50cm
BOARD
FOIL
sowmmc sown:

0" \Il BRIDGE

IDENTIFICATION
DRAWING

PARI

/ NUMBER

MI

The steps perfonned in this Pictorial are
in this area of the circuit board.

] R223: Resistor pack. Position the
dot or bar next to the "t" on the
circuit board, Solder the pins to
the foil and cut off the excess pin

lengths.

( ) 1201: 26 till choke (230-8492) Il
1201. Position the choke body It
shown md bend the leads I: shown.
Insert the leads into the circuit board
hold Ind solder them to the foil.
Cut off the excels lead lengths.

PICTORIAL 3-4

Page 53

Heathkita

Page 51

( ) Refer to Detail 4-1C. measure 8-1/2" from the
end of the smooth line cord lead. and install
the strain relief on the line cord as shown.
Then insert the end of the line cord through
hole C and insert the strain relief into the hole,

NOTE: If you are not going to install the GCA-lOOO-l
Accessory in your unit. perform the next step. Other-
wise. skip the step

[ ) Mount the rectangular plug at hole X6.

suooru LINE
cone LEAD

PLACE THE LINE
CORD IN THE

\/ SLOT

We or

C

,I

\v
/ 1%)

soueezs rue

THE TRAIN
YWO SEGMENT INSERT s

RELIEF INTO THE HOLE

( ) Mount the back panel assembly to the cabinet bot-
tom with two M3 x 6 mm flat head screws. Position

the panel with the bottom flange as shown.

NOTE: If you are installing the GCA-lOOO-l Accessory in
your unit, proceed to "Optional RS-232C Connector Instal-

. lation." otherwise, skip those steps and proceed to "Back
Pancl Wiring."

OPTIONAL RS-232C CONNECTOR
INSTALLATION

NOTE: Use the hardware supplied with the GCA-
1000-1 RS-232C Output Accessory to mount the con-
nector in the next step.

[ ) X6: Refer to Detail 4-1D and position the pin
1 end of the RSv232C connector you assembled
earlier as shown. Then mount the connector
to the back panel with two 4-40 X 3/16" hex
spacers. two #4 lockwashers, and two 4-40
nuts. NOTE: You will connect the Sewire cable
coming from the connector later.

0 @440 uur
C\
\ @u LOCKWASHEH
@ RS-232C
@ couuscron
\ / \
pm 1 sun

///\%

l-IOIJHG'

HALVES HEX SPACER
TOGETHER
Detail 4-1C Detail 4-10
0 y y: 3/. 1 (menus; 2 3 5 6
Us 3/! 5m 7m 1 l l I I
iv '1' '1 1l i 'l 11 I Ii II._L 1' 'i 'l' I '1 VI VII 1 Ti I I I I I 1T '1'
0 5 (cm 2 3 . s o 1 o o :0 u v: u u

Page 80

Page 78

Heathkit

HOW TO TROUBLESHOOT YOUR MOST
ACCURATE CLOCK

If you know which area your trouble is in. apply
the "Visual Checks" to that area.

You may also go directly to the Troubleshooting
Charts" to see if the difficulty you are having is listed
in one of the Problem" columns. If your difficulty
is listed there. check the "Possible Causes" listed
for that problem and apply the Visual Checks"
listed to the area of difficulty.

REPAIRING THE MOST ACCURATE CLOCK

When you make repairs to the Most Accurate Clock,
make sure you eliminate the cause as well as the

effect of the difficulty. If. for example. you should
find a damaged resistor. be sure that you find out
what caused the resistor to become damaged. If the
cause is not eliminated, the replacement resistor
may also become damaged when you put the Clock
back into operation. Do Not attempt to align or repair
the factory-assembled receiver circuit board. Return
the unit for service if the receiver board is suspect.

SHIPPING

IMPORTANT: If it becomes necessary to ship the
Most Accurate Clock to the Heath Company or a
Heath Electronic Center. attach the top and bottom
covers to protect the circuit boards during shipment
and remove the telescoping antenna.

TROUBLESHOOTING CHART

This Troubleshooting Chart lists specific difficulties
that could occur in your Most Accurate Clock. Sev-
eral possible causes may be listed for each difficulty.
Refer to the X-Ray Views" of the circuit board and
the Schematic Diagram to locate and identify the
parts listed in this chart.

If a particular part is mentioned [R101 for example)
as a possible cause. check that part and other compo-
nents connected to that part to see that they are in

stalled and/or wired correctly. Also check for solder
bridges and poor connections in the surrounding
area. It is also possible. on rare occasions. for a part
to be faulty and require replacement.

NOTE: Check each indicated resistor in the problem
area and make sure it is not interchanged with a
similar color-coded resistor. This applies mainly to
the 1% precision resistors. which are especially easy
to misread.

PROBLEM

POSSIBLE CAUSE

No display (nothing on the display circuit board is lit).

1. Fuse F201 is open (or fuse F202 it you are operating
on 12 VDC).
Display switch 510! is in the on position.

2.
3. $101 is improperly soldered or laulty.

Digits will not light. All appropriate LEDs are lit.

1 . Normal condition it the clock has not set itself. or it
power was lost temporarily.

2. U101 is detective or improperly installed.

3. Stop switch 8502 is shorted.

One digit is lit, other digits are off.

1. Clock oscillator is inoperative. Check transistors
0204 through 0207 and their associated
components.

Microprocessor IC U203.

. . This may be normal it the Clock has not set itself.

up

Page 93

Heathkit"

CIRCUIT HEATH
Comp. No. Pan No.

CAPACITORS
c300 Not used
0&1 25-335
CW2 21 -143
m 21-143
03% 21-143
0&5 21-143
OMS Not used
0307 Not used
Cm 20-102
C309 20-114
0310 Not used
0311 21 -143
0312 21 -1 40
0313 21-143
0314 31-97
0315 21-143
0316 31-97
0317 21-143
0318 31-97
0319 20-77
0320 N01 used
0321 20-104
0322 21-143
0323 21-46
0324 21-143
0325 21-143
0326 20-96
0327 31-57
0328 21-143
0329 20-96
0330 Not used
0331 31-57
0332 21-143
0333 20-96
0334 31-57
0335 21-143
0336 21 -3
0337 21-3
0338 21-46
0339 21-143
C340 Not used
0341 21-143
0342 21-46
0343 21-143
0344 21-143
0345 27-128
0346 27-128
0347 21-143
0348 25-879
0349 21-95

Page 91

DESCRIPTION

100 111 electroiytic
.05 uF ceramic
.05 pF oer-mic
.M 515 ceramic
.05 pF ceramic

100 pF mica
270 pF mica

.05 pF ceramic
.001 F ceramic
.05 pF ceramic
10-60 pF trimmer
.05 F ceramic
10-60 pF trimmer
.05 111 ceramic
10-60 91 trimmer
24 pF mica

130 pF mica

.05 11F ceramic
.005 uF ceramic
.05 uF ceramic
.05 F ceramic
36 pF mica
2.7-20 pF trimmer
.05 0F ceramic
36 pF mica

2.7-20 pF trimmer
.05 uF ceramic
36 pF mica
2.7-20 pF trimmer
.05 uF ceramic
10 pF ceramic

10 pF ceramic
.005 uF ceramic
.05 uF ceramic

.05 [LP ceramic
.005 pF ceramic
.05 F ceramic
.05 uF ceramic
.022 uF Mylar
.022 F Mylar

.05 uF ceramic
4.7 F electrolytic
.1 F ceramic

CIRCUIT

Comp. No.

0350
0351
0352
0353
C354
0355
0356
0357
0358
0359
0361

HEATH
Part No.

Not used
21-46

21 -95
25-880
25-580
25-887
21-95
25-887
21 -1 43
25-879
Not used

DESCRIPTION

.005 uF ceramic

.1 F ceramic

10 uF electrolytic
10 pF electrolytic
220 11F electrolytic
.1 uF ceramic

220 11F electrolytic
.05 pF ceramic
4.7 F electrolytic

INDUCTORS - CHOKE - TRANSFORMER

L301 401788 1.8 '1. inductor
L302 40-1737 4.7 uH inductor
L303 40-1786 13 H induclor
L304 45-82 350 pH choke
L305 40-1792 1.8 pH Inductor
L306 40-1798 4.2 pH inductor
L307 40-1682 15.5 |LH inductor
T301 52-161 IF translormer
T302 52-161 IF lranslon-nar
T303 52-161 IF Iranslormer
SEMICONDUCTORS
0301 41 7-874 2N3906 transistor
0302 417-874 2N3906 transistor
0303 417-874 2N3906 transistor
0304 417-801 MPSAZO transistor
0305 417-293 2N5770 transistor
0306 417-807 MPSHI 0 transistor
0307 417-887 MPSH10 transistor
0308 417-887 MPSHl 0 transistor
0309 417-290 MRF502 translstor
0310 Not used
031 1 417-801 MPSA20 transistor
0312 417-801 MPSAZO transistor
0313 417-874 2N3906 transistor
0314 417-801 MPSA20 transistor
31 5 417-074 2N3906 transistor
'JSO1 443-607 MC14013 integrated circuit
U302 442-612 LM386N-4 integrated circuit
CRYSTALS - FILTER
V301 404-685 5.4550 MHz crystal
Y302 404-686 10,4550 MHz crystal
V303 404-687 15.4550 MHZ crystal
Y304 404-630 Ceramic litter