Heathkit ID 1590 Manual

Page 2

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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 well 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 e at the factory, at any retail Heathkit Electronic Center, or through any of
our authorized oversees distributors.

This protection is exclusively yours as the original purchaser. Naturally, it doesn't cover damage by use of
acidcore solder, incorrect assembly, misuse, fire, flood or acts of God. But, it does insure the performance of
your Heathklt electronic product anywhere in the world ~ for most any other reason.

After-Warranty Service

What happens after warranty? We wont 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
authorized overseas distributor. We maintain an inventory of repJacement pans for each Heathkit model at most
locations e even for many models that no longer appear in our current product linerup. Repair service and
technicalconsultation are available through all locations.

We hope you'll never need our repair or replacement services, but it's nice to know you're protected anyway 7
and that cheerful help is nearby.

Sincerely,

HEATH COMPANY
Benton Harbor, Michigan 49022

Prices and specifications subject to change without notice.

Assembly
and
Operation
of the

-I-IE.A I-IKIT'

DIGITAL WIND

SPEED/ DIRECTION
lNDlCATOR

. .ccfi-e~\~

@DEL lD-1590/ ID-1590E

Copyright c 1975
Heath Company

AIIrIvhrmemd BENTON HARBOR, MICHIGAN 49022

TABLE OF CONTENTS

introduction
Parts List

Receiver Step-by
Main Circu

-StepAssemb|y ..........
itBoard . . . . .

Display Circuit Board to Main Circuit
BoardWiring
Cabinet Bottom Parts Mounting . . . . . . .

Wiring
Cabinet Top Preparation . . . . . . . . . . .
Receiver Testsand Adjustments . . . . . . . .

Receiver Final Assembly . . .

TransmitterAssembly . . . . . . . . . . . . . .

Transmitter Tests and Adjustments . . . . .

Transmitter Final Assembly . . . . . . . . . . .

Installation

In Case of Difficulty . . . . . . . . . .
Troubleshooting Chart . . . . . . . . . . .

Specifications

Circuit Description . . . . . . . . . . .

Semiconductor Identification Chart . . . . . . .

Circuit Board Vo
Schematic
Warranty . . .

Customer Service

HEATH COMPANY

ItageChart
_ (in the Illustration Booklet")
. Inside front cover

. . . . . . . . . .lnsiderearcover

10
13

21
23
24
26
28
32
33
42
44
51

52
53

55

56

58

59

Printed in U.S.A.

Page 5

Page 52

_HEATI-IKIT®

IN CASE OF DIFFICULTY

Begin your search for any trouble that occurs after assembly
by carefully following the steps listed below in the Visual
Tests. After you complete the "Visual Tests, refer to the
Troubleshooting Chart.

NOTE: Refer to the Circuit Board X-Ray Views" on Page
60 for the physical location of parts on the circuit board.

VISUAL TESTS

1. Recheck the wiring. Trace each wire in colored pencil
on the Pictorial as it is checked. It is frequently
helpful to have a friend check your work. Someone
who is not familiar with the unit may notice
something consistently overlooked by the kit builder.

2. About 90% of the kits that are returned to the Heath
Company for repair do not function properly due to
poor connections and soldering. Therefore, many
troubles can be eliminated by reheating all
connections to make sure that they are soldered as
described in the Soldering" section of the "Kit
Builders Guide. Be sure there are no solder "bridges"
between circuit board foils.

3. Check to be sure that all transistors and diodes are in
their proper locations. Make sure each lead is
connected to the proper point. Make sure that each
diode band is positioned above the band printed on
the circuit board.

4. Check the values of the parts, Be sure in each step that
the proper part has been wired into the circuit, as
shown in the Pictorial diagrams. It would be easy, for
example, to install a 27 kn (red-violet-orange) resistor
where a 2.7 $2 (red-violetagold) resistor should have
been installed.

5. Check for bits of solder, wire ends, or other foreign
matter which may be lodged in the unit.

6. A review of the Circuit Description may also help
you determine where the trouble is.

If you still do not locate the trouble after you complete the
Visual Tests," and a voltmeter is available, check voltage
readings against those shown on the "Schematic Diagram"
on a fold-in and on the Voltage Chart on Page 59. Read the
Precautions for Troubleshooting before you make any
measurements. NOTE: All voltage readings were taken with
a high input impedance voltmeter.

Voltages may vary as much as i20%. The minus or
BLU/BLK terminal on the receiver screw terminal is a
convenient ground point.

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. Your Warranty is
located inside the front cover.

PRECAUTIONS FOR TROUB LESHOOTING

1. Be cautious when testing transistor circuits. Although
they have almost unlimited life when used properly,
they are much more vulnerable to damage from
excessive voltage or current than tubes.

2. Be sure you do not short any terminals to ground
when you make voltage measurements. If the
voltmeter probe should slip, for example, and short
across components or voltage sources, it is very likely
to cause damage to one or more transistors or diodes.

SILICON BIPOLAR TRANSISTOR CHECKING

To check a transistor accurately, you should use a transistor
checker. However, if one is not available, you can use an
ohmmeter to determine the general condition of the
transistors in this kit. The ohmmeter you use must have at
least 1 volt DC at the probe tip to exceed the threshold of

the diode junctions on the transistor being tested. Most'

vacuum tube voltmeters meet this requirement.

-I-IEATHKIT@

Page 53

To check a transistor with an ohmmeter, proceed as follows:

1. Remove the transistor from the circuit.

2. Set the ohmmeter on the RXIODO range.

3. Connect one of the ohmmeter test leads to the
base (B) of the transistor. Touch the other meter
lead to the emitter (E) and then to the collector
(0). Both readings should be approximately the
same, but may be either high or low. If one

reading is high and the other low, the transistor
should be replaced. (Identify the transistor leads
on the Identification Chart on Page 58.)

4. Repeat step 3 with the test lead reversed.

5. Check the resistance from the collector to the
emitter to make sure there is not short circuit.

NOTE: In the unusual case when the readings are low, or all
high, no matter which ohmmeter lead is connected to the
base, the transistor should be replaced.

Troubleshooting Chart

This chart lists the Condition" and the "Possible Cause" of
a number of malfunctions. If a particular part is mentioned
(for example, "02") as a possible cause, check that part and
the parts connected to it to make sure they are correctly

connected and installed. Also
part was installed at that point.

make sure that the correct

Condition

Possible Cause

L1 only does not light.
L2 only does not light.
L3 only does not light.
L4 only does not light.
L5 only does not light.

L6 only does not light.

L1; D1; 5101.
L2; D2; 8102.
L3; D3; 3103.
L4; D4; 3104.
L5; D5; 3105.

L6; D6;8106.

light.

L7 only does not light. L7; D7; S107.
L8 only does not light. L8; D8; 8108.
L1, L3, L5, and L7 do not D102.

light.

L2, L4, L6, and LB do not D101.

No Wind Direction lights.

R1;open black wire.