Heathkit ETA 4200 Manual

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H EATHKIT®
MANUAL

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for the

LASER RECEIVER
Model ETA-4200

595-3367-01 2

HEATH COMPANY - BENTON HARBOR, MICHIGAN

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Heathklt
Table of Contents

Introduction ......... . ............ . ........ 2 In Case of Difficulty ...................... 20
Troubleshooting Chart ................... 21

Assembly Notes ............ . . . . , .......... 3
Specifications . . . . ............... . ........ 22

Parts List ....... . ......................... 6
Circuit Description . . . ..................... 23

Step-by-Step Assembly ..................... 8
Circuit Board Assembly .................. 8 Circuit Board X-Ray View . . ............... 23

Chassis Assembly ...................... . 13
Semiconductor Identification Chart .......... 24

Initial Tests ......... . .................... 17
Schematic Diagram ........................ 25

Final Assembly ...... . . ................... 18
Customer Service ........ inside the back cover

Adjustments .................. . ........... 19
Warranty ..... . ......... inside the front cover

INTRODUCTION

Your Model ETA-4200 Laser Receiver is a com-
plementary unit to your ET-4200 Laser Trainer. Its
purpose is to capture the laser beam from the Trainer
and to decipher any intelligence present on it.

The built-in meter will provide an indication of the
laser beams intensity to help you determine the
beam profile and power density.

The Receivers audio amplifier will reproduce any
audio information that was encoded on the beam
by the modulation circuits in the Laser Trainer. The
Receiver will also detect other types of beam mod-
ulation, such as that from an interferometer.

You will need two NEDA Type 1604A 9-volt al-
kaline batteries for this kit. We suggest that you pur-
chase these batteries right away so that you have
them on hand when you complete the assembly of
your kit.

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ASSEMBLY NOTES
TOOLS
You will need these tools to assemble your kit.
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LONG-NOSE DIAGONAL WIRE PHILLIPS
PLIERs CUTTERS STRIPPERS SCREWDRIVER
:OTHER HELPFUL
: TOOLS
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DESOLDERING
E / BULB
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l a DESOLDERING PENCIL
I NUT STARTER {E g BHAID. SOLDERING IRON
l (May Be Supplied (22 lo 25 WATTS)
: With Kit)
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ASSEMBLY
1. Follow the instructions carefully. Read the en- 3. Most kits use a separate Illustration Booklet

that contains illustrations (Pictorials, Details,
etc.) that are too large for the Assembly Man-
ual. Keep the Illustration Booklet" with the
Assembly Manual. The illustrations in it are
arranged in Pictorial number sequence.

tire step before you perform each operation.

2. The illustrations in the Manual are called Pic-
torials and Details. Pictorials show the overall
operation for a group of assembly steps; Details
generally illustrate a single step. When you are

directed to refer to a certain Pictorial for the 4. Position all parts as shown in the Pictorials.
following steps." continue using that Pictorial
until you are referred to another Pictorial for 5. Solder instructions are generally given only

another group of steps. at the end of a series of similar steps. You

may solder more often if you desire.

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Before you install an IC, lay it down on its side as
shown and Very carefully roll it toward the pins to
bend the lower pins into line. Then turn the IC over
and bend the pins to the other side in the same man-
ner.

Compare the IC to the drawing shown below. Then
determine which end of the 1C is the pin 1 end.

SMALL
INDENTATION NOTCH DOT

\é/

111

PIN 1 PIN 1 PIN 1
121er NOTCH
W? [Lyilih if?
PIN 1 PIN 1

Make sure that " a pin 1 end of the IC is positioned
over the index mark on the circuit board. Also make
sure that all of the pins are started into the socket.
Then press the IC firmly into the socket. NOTE: An
IC pin can become bent under the IC and it will
appear as though it is correctly installed in the sock-
et.

\ _ PINl
11.1}\ / END
1 la

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INDEX
MARK

Use an IC lifter or the blade of a small screwdriver
to lift and remove ICs from their sockets, if neces-
sary, without bending the IC pins.

( 1 U1:MC14581CatU1.

1 ) UZ:LM386N-4ICatU2.

NOTE: In the following step, when you install the
ceramic capacitor, do not push the insulated portion
of the leads into the holes. This could make it diffi-
cult to solder the leads to the foil.

INSULATION
\

INSULATION

( ) C5: .01 MF ceramic capacitor,

NOTE: In the following steps, when you install elec-

rolytic capacitors, always match the negative [-)
mark on the capacitor with the negative [-) mark
on '.he circuit board, or match the positive [+) mark
on 1m "apacitor with the postive [+) mark on the
board.

POSITIVE

NEGATIVE
(+) MARK

(-) MARK

OR

( ) C1: 220 11F electrolytic.
[ ) C2: 220 nF electrolytic.
[ ) C3: 10 11F electrolytic.
( ] C4: 10 11F electrolytic.
[ ) C6: 220 HF electrolytic.

( ] Solder the leads to the foil and cut off the ex-
cess lead lengths.

Heathkit®

Heathkit®

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Refer to Pictorial 1-3 (Illustration Booklet, Page 2)
for the following steps.

NOTE: In the following steps, when you install con-
trols on the circuit board, position them as shown
below. Push each control all the way down onto the
surface of the circuit board; then solder its leads to
the foil and cut off the excess lead lengths.

1 >\1

[ ] R1: 1 M0 control (#10-1213). Bend the leads
of this control so it will be flat on the board
as shown above.

[ ] R6:10kflcontrol[#10-1138].

[ ] R3: 10 k0 control (#10-1138).

NOTE: To prepare wires, as in the following steps,
out the wires to the lengths indicated. Then remove
1/4 of insulation from each wire end.

( ) Prepare the following wires:

Two 5 green 5 white
5" red 5 blue
5 yellow

( ] Tightly twist together the two green wires,
making sure both ends are even.

( ] In the same manner, twist together the 5 red
and yellow wires.

( ) In the same manner, twist together the 5" white
and blue wires.

NOTE: In the following steps, when you install a
wire in a circuit board hole, solder it to the foil and
cut off the excess wire end. Connect only one end
of each twisted pair at this time; the free ends will
be connected later.

( ] Red-yellow wires: Yellow wire to hole E; red
wire to hole G.

[ ) White-blue wires: White wire to hole F; blue
wire to hole H.

[ ) Green wires: One green to hole 1; other green
to hole I.

[ ) Refer to Detail 1-3A and cut the wires of the
two battery clips to 6". To prepare the wires,
remove 1/4 of insulation from each wire end.
Then tightly twist each bare wire and and add
a small amount of solder to hold the fine
strands together.

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g? (91 _1 1mm
DETAIL 1-3A
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