Heathkit IO-4205 User manual

HEATHKIT ®
MANUAL
5 Megahertz
Dual Trace
Oscilloscope
Model 10-4205
595-2072
·. '· .
.·':::;_·. 7 ... ~:··· ...::: ..... .
. · ..
, ,,_ ;~~:. ·.: .. · .: .. · ::·.:.~--~ 0
L~~-;·-~
HEATH COMPANY • BENTON HARBOR, MICHIGAN

HEATH COMPANY PHONE DIRECTORY
The following telephone numbers are direct lines to the departments listed:
Kit orders and delivery information
... . .... . ...... .. . . .. . [phone]
Credit
...... .. . . ...... ..... ....... .. ....... ... .. . ... . [phone]
Replacement Parts .
.... ..... ..... . . . ... .. . .. .. . .. .. ... [phone]
Technical Assistance Phone Numbers
8:
00A.M. to 12 P.M. and 1:00 P. M. to 4:30P .M., EST, Weekdays Only
RtC, Audio, and Electronic Organs . .
.. . . ...... ... ...... [phone]
Amateur Radio
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Test Equipment, Weather Instruments and
Home Clocks . .
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Television
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Aircraft, Marine, Security, Scanners, Automotive,
Appliances and General Products
.......... ...... •... . [phone]
Computers
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YOUR HEATHKIT 90 DAY LIMITED WARRANTY
If you are not satisfied with our service- warrantyor otherwise- or with our products, writedirectly to our DirectorofCustomer
Services, Heath Company, Benton Harbor,
Michigan 49022. He will make certain your problems receive immediate, personal
attention.
Our attorney, who happens to be quite a kitbuilder himself, insists that we describe our warranty using all the necessary legal
phrases in order to
comply with the new warranty regulations. Fine. Here they are :
For a period ofninety (90) days after
purchase , Heath Company will replace or repair free ofcharge any parts that are defective
either in materialsor workmanship. You
can obtain parts directly from Heath Company by writing us at the address below orby
telephoning us at [phone]. And we'll pay shipping charges to get those parts to you- anywhere in the world.
We
warrant that during the first ninety (90) days after purchase, our products, when correctly assembled, calibrated, adjusted
and used in accordance with our printed instructions, will meet published specifications.
If a defective part or error in design has caused your Heathkit product to malfunction during the warranty period through no
fault of yours, we will service it free upon proof of purchase and delivery at your expense to the Heath factory, any Heathkit
Electronic Center (units of Schlumberger
Products Corporation). or any of our authorized overseas distributors.
You will receive free
consultation on any problem you might encounter in the assembly or use of your Heathkit product. Just
drop us a
line or give us a call. Sorry, we cannot accept collect calls.
Our warranty does not cover and we are not responsible for damage caused by the use of corrosive solder, defective tools,
incorrect assembly, misuse, fire, or by
unauthorized modifications to or uses of our products for purposes other than as
advertised.
Our warranty does not include reimbursement for customer assembly or set-up time.
~
This warrantycovers only Heathkit products and is not extended to allied equipment or components used in conjunction with ~
our products. We are not responsible for incidental or consequential damages. Some states do not allow the exclusion or ~
limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty
gives you specific legal rights,
and you may also have other rights which vary from state to state.
HEATH COMPANY ~
BENTON HARBOR, MI. 49022 ~
oROOo&~uoOOOootooooomo~
Prices and specifications subject to change without notice.

Heathkit® Manual
HEATH COMPANY
for the
5 Megahertz
Dual Trace
Oscilloscope
Model 10-4205
595-2072
BENTON HARBOR, MICHIGAN 490 2 2
Copyright © 1978
Heath Company
All Rights Reserved
Printed in the United States of America

Page 2
TABLE OF CONTENTS
INTRODUCTION o 0 0 0 0 0 0 0 0 0 0 0 0 0 o o o o 0 0 0 0 0 0 0 0 0 0 0 0 3
UNPACKING o o o o 0 0 0 0 0 0 0 0 0 0 0 0 0 o o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4
ASSEMBLY NOTES 0 o o o o o 0 0 0 0 0 0 0 0 o o o o 0 0 0 0 0 0 0 0 0 5
VERTICAL CIRCUIT BOARD
Parts List 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
Step-by-Step Assembly 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11
HORIZONTAL CIRCUIT BOARD
Parts List 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 33
Step-by-Step Assembly 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 36
POWER SUPPLY CIRCUIT BOARD
Parts List 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 50
Step-by-
Step Assembly 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 52
CHASSIS
Parts List 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 59
Step-by-Step Assembly 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 61
INITIAL TESTS 0 0 0 0 0 0 0 0 o 0 o o o 0 0 0 0 0 0 0 0 o o o o o o o 0 o 80
CALIBRATION 0 0 0 0 0 0 0 0 0 0 o o o 0 0 o 0 0 0 0 0 0 o o o o 0 0 0 0 82
FINAL ASSEMBLY o o 0 0 0 0 0 0 0 o o 0 0 o 0 0 0 0 0 o o o 0 0 0 0 88
OPERATION 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 0 o 0 0 o o o 0 0 0 0 0 0 o 0 89
IN CASE OF DIFFICULTY 0 0 0 0 0 0 0 0 0 0 o o 0 0 0 0 0 0 0 o 97
SPECIFICATIONS 0 0 0 0 0 o o o 0 0 0 0 0 0 0 0 0 0 o o 0 0 0 0 0 0 106
THEORY OF OPERATION 0 o 0 o o o 0 o 0 o 0 0 0 0 0 o o 0 0 108
CIRCUIT DESCRIPTION o o o 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 109
SEMICONDUCTOR IDENTIFICATION
CHART 0 0 o o o o o o o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o 0 o 0 0 0 0 0 0 116
CIRCUIT BOARD X-RAY
VIEWS 0 0 0 0 0 0 0 0 0 0 0 0 0 Illustration Booklet, Page
36
SCHEMATIC DIAGRAM 0 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 (Fold-in)
WARRANTY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Inside front cover
CUSTOMER SERVICE 0 0 0 0 0 0 0 0 0 0
Inside rear cover

; ; :
INTRODUCTION
The Heathkit Model 10-4205, 5 MHz, Dual-Trace Os-
cilloscope is a compact, versatile, easy-to-build, elec-
tronic instrument that you can use to study the
waveforms in electronic circuits. You can also use it
to measure frequency, and AC or DC voltages. The DC
to 5 MHz bandwidth and the excellent input sensitiv-
ity of
the vertical amplifiers allow you to use this
Oscilloscopefor nearlyall types ofwaveform applica-
tions . The triggered horizontal sweep circuit and the
many other outstanding features provide accuracy
and capabilities that are usually found only in higher
priced oscilloscopes.
Among the many other features this Oscilloscope of-
fers are:
• A
special TV position on the triggerselector.
This allows low frequencies to pass while
rejecting high frequencies, thus making it
Page 3
easier to trigger on the vertical frequency of
a TV set.
• A
10 to 1 attenuation circuit that can be used
for signals applied to the external, horizon-
tal
input jack.
• Accurately calibrated vertical
attenuators
with variable controls.
• A calibrated
time base (seven time base
selections, variable
within each selection).
These features, along with the attractive styling, will
make this Oscilloscope a welcome asset to the
laboratory, service shop, or the ham shack .

Page 4
UNPACKING
Inside the shipping carton was the box stamped PKl
which contained this Assembly Manual. With this
box removed from the shipping carton , you will find
bags
stamped PACK 2 through PACK 4. The Manual
will refer to these areas as "packs." You will be di-
rected
to open each of these "packs" as it is needed.
All other parts
in the shipping carton will be consid-
ered
the "final pack." Caution: Do not remove any
partsfrom their bags or the "final pack" until they are
specifically called for
in a Parts List in the Manual.
Eachassembly section of
the Manual containsits own
"Parts List" and "Step-by-Step Assembly" instruc-
tions.
At the beginning of each "Parts List," you will
be instructed to open one of the packs. You will also
be directed, in some Parts Lists, to remove certain
parts from the final pack.

Page 5
~~~~;allllll;ll:ll=u~ ......................................................................
ASSEMBLY NOTES
TOOLS
You will need these tools to assemble your kit .
PLIER S
DIA GON AL
C UTT ERS
------------------------------------------------- H
EA TH KI T
SO LD ERING
I
RO N
OTHER HELPFU~
TOOLS ~
/
NUT S TA R TER
1IMAY BE SUP PLIED
I WITH" KI TI
I
I
DE SO LDE RI NG
BUL B*
D
ESO LDER I NG
BR AID *
OR
PE NC IL
SO
LD ER I NG I RON
125 TO 40 WATT S!
I * TO REMOVE S OLDE R FROM CIR C UIT C ON NEC TI ONS .
·------------------------------------------------~
ASSEMBLY
1.
2.
Follow the instructions carefully. Read the en-
tire step before you perform each operation .
The illustrations in the Manual are called Picto-
rials
and Details. Pictorials show the overall op-
eration for a group of assembly steps ; Details
generally illustrate a single step. When you are
directed to refer to a certain Pictorial "for the
following steps," continue using that Pictorial
until you are referred to another Pictorial for
another group of steps.
3.
4.
5.
Most kits use a separate "Illustration Booklet"
that contains illustrations (Pictorials, Details,
etc.)
that aretoolargefor the AssemblyManual.
Keep
the "Illustration Booklet" with the As-
sembly Manual. The illustrations in it are ar-
ranged in Pictorial number sequence.
Position all parts as shown in the Pictorials.
Solder a part or a group of parts only when you
are instructed to do so.

Page 6
6. Each circuit part in an electronickit has its own
component number (R2, C4, etc. ). Use these
numbers when you want to identify the same
part in the various sections of the Manual.
These numbers , which are especially useful ifa
part has to be replaced , appear:
In the Parts List,
At the beginning of each step where a
component is installed,
In some illustrations,
In the Schematic,
In
the section at the rear of the Manual.
7. When you are instructed to cut something to a
particular length, use the scales (rulers) pro-
vided at the bottom of the Manual pages.
SAFETY WARNING:
Avoid eye injury when you cut
offexcess lead lengths. Hold the leads so they cannot
fly toward your eyes.
SOLDERING
Soldering is one of the most important operations you
will perform while assembling your kit. A good sol-
der connection will form an electrical connection be-
tween two parts , such as a component lead and a
circuit board foil. A bad solder connection could pre-
vent an otherwise well-assembled kit from operating
properly.
It is easy to make a
good solder connection if you
follow a few
simple rules:
1.
2.
Use the right type of soldering iron. A 25 to
40-watt
pencil soldering iron with a 1/8" or
3/16" chisel or pyramid tip works best.
Keep
the soldering iron tip clean. Wipe it often
on a wet sponge or cloth ; then apply solder to
the tip to give the entire tip a wet look. This
process is called tinning , and it will protect the
tip and enable you to make good connections .
When solder tends to "ball" or does not stickto
the tip, the tip needs to be cleaned and retin-
ned.

PARTS
Resistors will be called out by their resistance value
in 0 (ohms), kO (kilohms), or MO (megohms). Certain
types of resistors
will have the value printed on the
body, while others will be identified by a color code .
The colors of
the bands and the value will be given in
the steps, therefore the following color code is given
Page 7
==
OR
1/4-WATT
==fllm-===OR~
1/2-WATT
for information only. Multiplier
BANDS : 1 2 3 / /Tolerance 1-WATT
*Note Wide
Space
=======~--~=
2-WATT
Band 1 Band 2 Band 3 (if used)
Multiplier
Resistance
1st Digit 2nd Digit 3rd Digit
Color Digit Color Digit Color
Black 0 Black 0 Black
Brown 1 Brown 1 Brown
Red 2 Red 2 Red
Orange 3 Orange 3 Orange
Yellow 4 Yellow 4 Yellow
Green 5 Green 5 Green
Blue 6 Blue 6 Blue
Violet 7 Violet 7 Violet
Gray 8 Gray 8 Gray
White 9 White 9 White
Capacitors will be called out by their capacitance
value in JLF (microfarads) or pF (picofarads) and type:
ceramic, Mylar*, electrolytic, etc.
Some capacitors
may have their value printed in the following man-
ner :
Digit Color Multiplier
0 Black 1
1 Brown 10
2 Red 100
3 Orange 1,000
4 Yellow 10,000
5 Green 100,000
6 Blue 1,000,000
7 Silver 0.
01
8 Gold 0.1
9
EXAMPLES:
151K =:= 15 X 10 = 150 pF
759 = 75 X0.1 = 7.5 pF
Tolerance
Color Tolerance
Silver
:!: 10%
Gold
:!:
5%
Brown
:!: 1%
First digit of
capacitor's value: 1
NOTE: The letter"R" may be used at times to signifya
decimal point: as in: 2R2 = 2.2 (pF or JLF).
Second digit of
capacitor's value: 5
____ _,
Multiplier: Multiply the
first & second digits by
the proper value from the
Multiplier Chart.
To find the tolerance of
the capacitor, look up
this letter
in the Tolerance
columns.
* DuPont Registered Trademark
MULTIPLIER
FOR THE
NUMBER:
0
1
2
3
4
5
8
9
MULTIPLY
BY:
1
10
100
1000
10,000
100,000
O.D1
0.1
TOLERANCE OF CAPACITOR
10 pF OR LETTER OVER
LESS 10 pF
±0.1
pF
B
±0. 25 pF c
±0.5 pF
D
±1.0 pF
F
:± 1o/o
±2.0 pF
G ± 2°/o
H ±3
o/o
J ±5°/o
K ±
10%
M ±
20%

Page 8
VERTICAL
CIRCUIT
BOARD
PARTS LIST
Remove the parts from the pack marked #1. Check
each
part against the following list. The key numbers
correspond to the numbers on the Vertical Circuit
Board Parts Pictorial (Illustration Booklet, Pages 1
and 2). Any part that is in an individual envelope with
the part number on it should be placed back into the
envelope after you identify it until it is called for in a
step. Do
not discard an y packing materials until all
parts are
accounted for.
KEY HEATH QTY. DESCRIPTION
CIRCUIT
No. Part
No . Comp. No.
RESISTORS
All resistors are 5% (fourth band gold) unless designated 1 0%
(fourth band silver).
NOTE : The resistors may be packed in more than one en-
velope (stamped RES). Open all the resistor envelopes in this
pack before you check the resistors against the Parts List.
1/2-Watt 2 \.S
3L \ Y ; · tV\-G M ~ )
~ tcf-i ~ I R \05~
AI
(p- 15q
A1 6-279 3 2.7 n (Red-Viol-Gold) R179,
R181,
R182
A1 6-100 20 10 n (Brn-Bik-Bik) R124A, R124B,
R131A, R131B,
R142A, R142B,
R145A, R145B,
R157A, R157B,
R158A, R158B,
R159A, R159B,
R164A, R164B,
R166, R168,
R174 , R175
A1 6-220 4
22 n (Red-Red-Bik) R147A, R147B,
R148A, R148B
Some parts are marked with a " 171- " or "172- " pack-
aging number.
These numbers are used for packaging
purposes only and do not appear in the " Manual Parts
List."
To order a
replacement part, always include the
PART NUMBER. Use the Parts Order Form furnished
with the kit . If one is not available, see "Replacement
Parts"
inside the rear cover. For prices, refer to the
separate " Heath Parts Price List."
KEY HEATH
QTY. DESCRIPTION
CIRCUIT
No.
Part No . Comp. No .
Resistors (Cont'd.)
A1 6-330 {
33 n (Org-Org-Bik) R1A , R1B ,
R2A , R2B ,
::::ftj:() SA , R4059;
R106A, R106B
A1 6-390 2 39 n (Org-Wht-Bik) R151A, R151B
A1 6-470 2 47 n (Yei-Vioi-Bik) R134A, R134B
A1 6-820 2
82 n (Gry-Red-Bik) R144A, R144B
A1 6-101 6 100 n (Brn-Bik-Brn) R161A,
R16 · 1B,
R162A, R162B,
R171, R172
A1 6-201 2 200 n (Red-Bik-Brn) R117A, R117B
A1
6-221
8 220 n (Red-Red-Brn) R111A, R111B,
R113A, R113B,
R114A, R114B,
R183, R184
A1
6-271
2
270 n (Red-Vioi-Brn) R108A, R108B
A1 6-331 2 330 n (Org-Org-Brn) R116A, R116B
A1 6-391 6 390 n (Org-Wht-Brn) R135A, R135B,
R139A, R139B,
R153A, R153B
A1 6-471 2 470 n (Yei-Vioi-Brn) R136A, R136B
A1 6-511 2
510 n (Grn-Brn-Brn) R115A, R115B
A1 6-751 2 750 n (Vioi-Grn-Brn) R163A, R163B

Page 9
® ~ f§
1
%f#fB+@
KEY HEATH QTY. DESCRIPTION CIRCUIT KEY HEATH QTY. DESCRIPTION CIRCUIT
No . Part No. Comp. No. No. Part No. Comp.
No.
Resistors (Contd.) Capacitors, Ceramic (Cont'd.)
A1
6-102 20 1000 n (8rn-81k-Red) R104A, R1048;
81 21-141 1 .0033
JLF
C131
R133A, R1338,
81 21 -27 4 .005
JLF
C107A, C1078,
R141A, R1418, C135, C136
R146A, R1468,
81 21-47 3 .
01 JLF
C109A, C1098,
R149A, R1498, C122
R156A, R1568,
81 21 - 31
.02 JLF C124
R165, R167,
81
21-199 2 .1
JLF C114A, C1148
R185, R186,
R187, R188, Electrolytic
R191 , R192
A1 6-122 2 1200 n (8rn-Red-Red) R155A, R1558 82 25-115 8
10 JLF C111A, C1118,
A1 6-182 2 1800 n (8rn-Gry-Red) R137A, R1378 C113A, C1138,
A1 6-272 4 2700 n {Red-Viol-Red) R118A, R1188, C123, C132,
R122A, R1228 C133, C134
A1
6-332 4 3300 n (Org-Org-Red) R119A, R1198,
83 25-117 4 100
JLF C118A, C1188,
R121A, R1218 C119A, C1198
A1 6-912 2 9100 n (Wht-8rn-Red) R103A, R1038
B3
25-160 3 250
JLF C125, C126,
A1 6-103 4
10 kfi (8rn-81k-Org) R109A, R1098, C127
R154A, R1548
A1 6-153 2 15
kfi (8rn-Grn-Org) R132A, R1328 Trimmer
A1 6-223 22
kfi (Red-Red-Org) R169
A1
6-913 2
91 kfi (Wht-8rn-Org) R102A, R1028
84
31-56 4 1.
5- 20 pF C101A, C1018,
A1 6-104 2 100
kfi (8rn-81k-Yel) R107A, R0178 C103A, C1038
A1
6-914 2 910
kfi (Wht-8rn-Yel) R101A, R1018
84 31 - 54 2 4-40 pF
C102A, C1028
84 31-52 4 8-60
pF C104A, C1048,
C115A, C1158
Other Resistors
85 31-77 2 80-400
pF
C106A, C1068
6-1801- ~
'/t..j
A2
4 1800 n (1.8
k) ~ watt , R123A, R1238,
IZ.
1% (8rn-Gry-81k-8rn) R127A, R1278 Other Capacitors
A2 6-4320-11 4 432 n' 1/8-watt, 1% R125A, R1258,
(Yei-Org-Red-81k) R126A, R1268 86 27-28 2 .1
JLF Mylar C1 , C2
A3
1-19-1 220 n,1-watt, 10% R173
{Red-Red-8rn)
A4 5-11-2 15
kfi , 2-watt, 10% R176
(8rn-Grn-Org) DIODES
AS
3-55-5 2 2000 n
(2 k), 5-watt R177, R178
C1 56-56
~
1N4149
g~e~A . o~e+So
CAPACITORS \(o 9Hl2A., 0192&,-
0103A, 01038,
Ceramic 0104A,
01048 ,
0105A,
01058 ,
81 21-7 2 33 pF C117A, C1178 0106A,
01068 ,
81 21-121 4
56 pF C112A, C1128, 0108A,
01088 ,
C116A, C1168 0109A,
01098 ,
81 21-75 1 100 pF
C121
0111A, 01118 ,
81 21-722 2 330 pF C105A, C1058 0112A,
01128
81 21-140 2 .
001 JLF C128, C129
C1 56-67 VR10A 0107
81 21-36 2 .002
JLF
C108A, C1088
C1 56-89 4 G0510 0113, 0114,
0115,0116

Page 10
KEY HEATH QTY. DESCRIPTION
No. Part No.
CIRCUIT
Comp.
No.
TRANSISTORS-INTEGRATED CIRCUITS (IC's)
NOTE:Transistors and integrated circuits are marked for iden-
tification in one of the following four ways:
1. Part Number.
2. Type number. (On integrated circuits, this refers
only to the numbers and letters listed. Any addi-
tional letters or numbers
on an IC are not signifi-
cant.)
3. Part number
and type number.
4. Part number with atype number other than the one
listed.
01 417-235 8 2N4121 transistor
01 417-237 2 SE6020 transistor
01 417-260 4 2N4258A transistor
01 417-293 4 2N5770 transistor
01 417-801 4 MPSA20 transistor
02 417-834 2 MPSU10 transistor
03 417-902 4 5566 transistor
04 443-1 7400 IC
04 443-4 1 7472 IC
pi LJll- ~Lf
1../ "=>e1 eo tfl.!M!? Is '\tJ f
OTHER CIRCUIT COMPONENTS
E1 10-357
E2 10-917
E2
E2
E3
E4
E5
E6
E7
10-918
10-936
10-1118
60-73
60-624
63-1316
475-16
HARDWARE
#4 Hardware
F1 250-428
F2 250-52
F3 250-186
F4 252-15
F5 254-9
2 100 n control
3 200 n control
2
2
2
2
1
2
2
500 n control
1000
ll (1K) control
1000
ll (1K) control
DP3T 3-position slide switch
DP4T 4-position slide switch
Rotary switch with 5000 n
(5K) control
Ferrite bead
1 4-40 x 1/4" flat head screw
2 4-40 x 1/4" screw
4
#4 x 3/8" screw
3 4-40 nut
3
#4 lockwasher
0 Y. }'2 "/. (I N C HES ) 2
0106A , 01068
1
0107A I 01078
1
01 08A, 01088
1
0109A I 01098
0113 1 0114
0104A , 01048 ,
01 05A, 01 05B
0111A , 01118 ,
0112A , 0 1 128
0103A , 0 1 038 ,
0117 , 0118
0115 , 0116
0101A , 01018 ,
0102A , 01028
U101
U102
DID\ 1::>10\5
)
DIDZ.AJ "))l Z!S
R112A, R112B
R152A, R152B,
R189
R143A, R143B
R138A, R138B
R4A, R4B
SW1A, SW1B
SW3
SW2A-R3A,
SW2B-R3B
3
KEY HEATH QTY. DESCRIPTION
No. Part
No.
#6 Hardware
G1 250-1282 3 6-32 x 1/8" black setscrew
G2 250-33 4 6-32 x 1/8" setscrew
G3 250-416 4 6-32 x 1/4" flat head screw
G4 250-56 4 6-32 x 1/4" screw
G5 252-3 4 6- 32 nut
G6 254-1 4
#6 lockwasher
Other Hardware
H1 253-50 2 1/4" plastic spacer
H2 252-7 4 3/8-32 nut
H3 255-145 2 3/8" spacer
MISCELLANEOUS
J1 75-769
J2 75-770
J3 266-1008
J4
J5
J6
J7
85-2043-1
204-2315
204-2333
206-1273
215-95
343-15
344-
51
346-1
347-55
390-1436
J8 432-892
J9 434-230
J10 434-298
J11 453-66
J12 455-44
J13 456-7
J14 462-1049
J15 462-1050
J16 462-1055
L1 490-5
134-237
L2 260-16
L3 73-34
390-147
390-1255
390-1483
391-34
597-260
4
Slide switch cover (1 -7 /1 6")
Sl i de switch cover (29/32")
Slide switch cover
(1 -3/16")
Vertical circuit board
Sw itch bracket
2 Control bracket
1 Circuit board shield
2 Heat sink
4' Shielded cable
3' Brn wire
8-1 /2" Sleeving
1-1 /2' a-conductor flat cable
1 Metal front panel
2 BNC connector
4 8-pin IC socket
2 14-pin IC socket
2 5" extension shaft
2 Split plastic bushing
2 Shaft coupling
Red knob
2 Small black knob
Large black knob
Plastic nut starter
1 Cable with connector
2 Alligator clip
2 Red alligator clip insulator
Danger label
Fuse label
Power consumption label
Blue and white label
Parts Order Form
Solder
Assembly Manual (See Page 1
for Part Number)
5 6
I1 (8 I 3~ 8 I " (8 I 7 ~ 8 I .I I I I I I
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'I
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10 11
12 13 1 4 15
,.,
CIRCUIT
Comp.
No.
J1 , J2
7
'II
I
17

In the following steps, you will be
given detailed
instructions on how to
install
and solder the first part on the
circuit board. Read and perform each
step carefully.
Then use the same pro-
cedure whenever you install parts on a
circuit board.
NOTE: Only a
portion of the circuit
board is
shown in some of the follow-
ing Pictorials.
The small "Identifica-
tion Drawing" at the top of the page
shows the area ofthe circuit boardtobe
assembled.
( ) Position
the circuit board as
shown with the printed side (not
the foil side) up.
NOTE:
When you install a component
that has its value printed on it, position
the value marking up, so it can be eas-
ily
read . Diodes should be mounted
with their type or part number up, if
possible.
Hold a 910 k.O (Wht-Brn-Yel) re-
sistor
with long-nose pliers and
bend the leads straight down to fit
the hole spacing on the circuit
board .
( ) R101B:
Push the leads through
the holes at the indicated location
on the circuitboard. The end with
color bands may be positioned
either way .
Press
the resistor against the cir-
cuit board. Then bend the leads
outward slightly to hold the resis-
tor in place .
STEP-BY-STEP ASSEMBLY
Page 11
IDENTIFICATION
DRAWING
CONTINUE<:/
The steps performed in this Pictorial are
in this area of
the circuit board.
PICTORIAL 1-1
( ) Turn the circuit board over and
solder the resistor leads to the foil
as follows:
1.
Push the soldering iron tip
against both the lead and the
circuit board foil. Heat both
for two or three seconds.
SOLDERING
iRON
COMPONENT
/)
LEAD w
~~~
BOARD
2. Then apply solder to the
other side of the connection .
IMPORTANT: Let
the heated
lead
and the circuitboard foil
melt
the solder.
SOLDERING
IRON
SOLDER
FOIL'\_
3. As the solder begins to melt,
allow it
to flow around the
connection . Then remove the
solder
and the iron and let the
connection cool.
FOIL
SOLDERING
IRON
( ) Cut off the excess lead lengths
close to
the connection . WARN-
ING: Clip
the leads so the ends
will not fly toward your eyes.
( ) Check each connection. Compare
it to
the illustrations on Page 12 .
After you have checked
the solder
connections, proceed
with the as-
sembly
on Page 13. Use the same
soldering procedure for each
connection .

Page 12
A GOOD SOLDER CONNECTION
~-------------------,
S OLDER FLOWS OUTWARD
AND GRADUALLY BLEND S
WITH
THE FOIL AND
THE LE AD .
,')
/
,' /
// ,(_;; OLDER IN G
',, IRON
,~;~ P OS ITIO N ED
CO RR EC TL Y
I
I
I
I
I
When you heat the lead and the circuit board foil at the same I
time , the solder will flow evenly onto the lead and the foil. I
1 The solder will make a good electrical connection between I
Lt~ ~~~ ~ !!!i~ ___________ -~
POOR SOLDER CONNECTIONS
~----------------------------~-----,
I SOL DE R DOES NO T FL OW / / I
ONT O LEA D. A DAR K RO S IN , ,') ,' SOLDERING
I BEAD SURROUN DS AND IN- // ,' SO LD ER APPEARS TO FLOW //,. - ........_ IRON
I SUL
ATE S THE L EA D FRO M ROS IN ,<; , IN WA RD AND S ET ON TOP / , ', PO SIT IONED
T
HE CONNECT I ON . //,'S OLDERING OF TH E FO IL . //,' IN CO RRE C TL Y
'
'' "" IRON '
I FO IL //• PO S ITIO N ED
I ,,, , I NC ORRE C TL Y
I When the lead is not heated sufficiently, the solder
I will not flow onto the lead as shown above. To cor-
When the foil is not heated sufficiently the solder will
blob on the circuit board as shown above. To correct,
1 rect, reheat the c onnection and , if necessary, apply a reheat the connection and , ifnecessary, apply a small 1
1 small amount of additional solder to obtain a good amount of additional solder to obtain a good connec- I
Lc~~c~r:_ _____________ _!~;.... ______________ .J .~
SOLDER BRIDGES
A solder bridge between two adjacent foils is shown
in photograph A. Photograph B shows how the con-
nection should appear. A solder bridge may occur if
you
accidentally touch an adjacent previously sol-
dered connection, if you use too much solder, or if
you "drag"
the soldering iron across other foils as you
remove
it from the connection . A good rule to follow
is:
alwa ys take a good look at the foil area around each
lead before you solder it. Then , when you solder the
connection , make sure the sold er remains in this area
and does not bridge to another foil. This is especially
important when the foils are small and close together.
NOTE:
It is alright for solder to bridge two connec-
tions on the same foil.
Use
only enough solder to make a good connection ,
and lift the soldering iron straight up from the circuit
board . If a solder bridge should develop, turn the
circuit board foil- side-down and heat the solder be-
tween connections. The excess solder will run onto
the tip of the soldering iron , and this will remove the
solder bridge . NOTE: The foil side of most circuit
boards has a coating on it called " solder resist." Th is
is a protective
insulation to help prevent solder
bridges.
B
A
SOLDER
BRIDGE

:: :: ::
The steps performed in this Pictorial a re
in this area of the circuit board. --~,.-fi
Be sure you installed resistor
in Pictorial 1-1 (Page 11).
R102B:
91 kfl (Wht-Brn-Org).
R105B: 1.5 0 (Brn-Grn-Gold).
NOTE: Your circuit board may be
marked 33 at this location.
R104A: 1000 0 (Brn-Blk-Red).
R105A: 1.5
tf (Brn-Crn-Go1d).
NOTE: Your circuit board
may be
33
at this location.
Solderthe leads to
the foil and cut
off the excess lead lengths .
NOTE: When you install a diode, al-
ways
match the band onthe diode with
the
band mark on the circuit board. A
DIODE
WILL NOT WORK PROPERLY
IF
IT IS INSTALLED BACKWARDS.
See Detail 1-2A.
BAN:~ }/ '¥- NO
· ·· :·:: :-:.:· :·:·:" ··BAND GLASS'--..
BODY COLORED
END
If your diode hasa solid body , the band
is clearly defined. If your diode has a
glass
body , do not mistake the colored
end inside the diode for the banded
end . Look for a band painted on the
outside of the glass.
)
PART
NUMRER
PICTORIAL 1-2
Page 4 of 5
10-4205/595-2072
591-3025
IDENTIFICATION
DRAWING
Page 13
07B: 100 kfl (Brn-Blk- Yel) .
01B:
Selected transistor
(#417-854). See Detai11-2B.
"""" '""',"~the leads to the foil and cut
excess lead
lengths ~
: 100 kfl (Brn-Blk- Yel) .
U
·· 1 ho1A: Selected transistor
(#417-854). See Detail1-2B.
Soldertheleads to thefoil and cut
off the excess lead lengths.
IMPORUNT: THE BANDED END OF DIODES CAN
BE MARKED IN A NUMBER OF WAYS.
~
BANDED END
.._ ___ Detail1-2A __ _

Page 14
The steps performed in this Pictorial are
in this area of the circuit board. --~---~.....:;
178: 200 .n (Red-Blk-Brn).
168: 330
.n (Org-Org-Brn).
1278: 1800
.n (1.8 k). 1% (Brn-
Gry-Blk-Brn). '
/4 ~
1158: 510 .n (Grn-Brn-Brn).
1148: 220
.n (Red-Red-Brn).
Solder the
leads to the foil and cut
off the excess
lead lengths .
17
A: 200 .n (Red-Blk-Brn).
R116A: 330
!l (Org-Org-Brn).
NOTE:
When a bar e wire is called for in
a step, remove all the insu l ation from
the specified l ength of brown wire.
0
1" bare wire.
R125A: 432 .0 , 1% (Yel-Org-Red-
Blk).
R126A: 432 .0, 1% (Yel-Org-Red-
Blk).
R115A: 510
.n (Grn-Brn-Brn).
R114A: 220
.n (Red-Red -B rn).
R113A: 220
!l (Red-Red-Brn).
Sol
der the leads to the foil and cut
off the excess lead lengths.
y.
Yo
:y.
1 (I N C H IE S)
2
I1( 8 I 3~ 8 I
~ ( 8 I
1; 8 1 I I
I I I
I I I I I I
iif l jiill)
0 .e 1 (
CM ) 2 3 4 e I
I I I I I
I I I
8 7 I
IDENTIFICATION
DRAWING
PART
NUMBER
c=:>
r-----l
I I
: I
I I
I I
I I
I
I
I
I
I
PICTORIAL 1-3
3 4
I I II I I I I I I I I II I
I I I
I
8 " 10 ,
12
CONTINUEO
IDENTIFIC
DRAWl
I I
NOTE: When a wire is called for in a
step,
cut the brown wire to the
specified length. Then remove 1/4" of
insulation from each end.
5
I
2-1/4" Brn wire .
D104B: 1N4149
diode (#56-56).
D103B: 1N4149
diode (#56-56).
R118B: 2700
!l (Red-Viol-Red).
R126B: 432 .0, 1% (Yel-Org-Red-
Blk).
R125B: 432 .0 , 1% (Yel-Org
-R ed-
Blk).
R124B: 10
!l (Brn-Blk-Blk).
R127A: 1800
.n (1.8 k). 1% (B rn -
Gry-Blk-Brn). '
/'1 ~
R123A: 1800 !l (1 .8 k), 1% (Brn-
Gry-Blk-Brn).
'/~ ~
Sol der the leads to the foil and cut
the excess lead lengths.
R122A: 2700
!l (Red-Viol-Red).
R136A: 470
.n (Yel-Viol-Brn).
nP , n r n<> r the l eads to the foil and cut
off
the excess lead lengths.
6
I
I I I I I I I I II I I I I
I I I
13 14 18 18 17
7
I

The ste ps performed in this Pictorial are
in this area of the circuit board.
R136B: 470 0 (Yel-Viol-Brn).
R137B: 1800 0 (Brn-Gry-Red).
1000 0 (Brn-Blk-Red).
1800 0 (Brn-Gry-Red).
Solder the leads to the foil and cut
off the excess lead lengths .
PICTORIAL 1-4
IDENTIFICATION
DRAWING
Page 15
: 82 0 (Gry-Red-Blk).
1000 0 (Brn-Blk-Red).
82 0 (Gry-Red-Blk).
R154A: 10 0 (Brn-Blk-Blk).
R147A:
22 0 (Red-Red-Blk).
Solder th e leads to the foil and cut
off the excess lead l engt hs .

1
Page 16
The steps performed in this Pictorial are
in this area of the circuit board.
100
fi (Brn-Blk-Brn).
: 100 n (Brn-Blk-Brn).
Solder the leads to
the foil and cut
off the excess lead lengths.
R146A: 1000
fi (Brn-Blk-Red).
149A: 1000 n (Brn-Blk-Red).
R155A: 1200
fi [Brn-Red-Red).
R151A: 39
fi (Org-Wht-Blk).
R154A: 10
k!l (Brn-Blk-Org).
Solder
the leads to the foil and cut
off the excess lead lengths .
PICTORIAL 1-5
PART
NUMBER
R154B: 10
k!l (Brn-Blk-Org).
R187: 1000
fi (Brn-Blk-Red).
D111B: 1N4149
diode (#56-56).
R159B: 10 n (Brn-Blk-Blk).
;Y Solder the leads to the foil and cut
off the excess lead lengths.
./
J
Solder the leads to the foil and cut
off the excess lead lengths .
(Wt"S}

IDENTIFICATION
DRAWING
Page 17
PART --------~----~-
NUMBER
~-;-~--- The steps performed in this Pictorial are
D113: GD510
diode (#56-89).
( ,..YR192: 1000 n (Brn-Blk-Red).
(
,)-- R186: 1000 n (Brn-Blk-Red).
( vJ' R188: 1000 n (Brn-Blk-Red).
R185: 1000 n (Brn-Blk-Red).
Solder the leads to the foil and cut
off the excess lead lengths .
166: 10 n (Brn-Blk-Blk).
10 n (Brn-Blk-Blk
).
Solder the leads to the foil and cut
off the excess lead lengths .
O y.y,•;. 1
I 1[8 I •; aI 5[B I 7ta I
l i flj lll ij I I I '
Q ·5 1 (CM) 2
( I NCHES)
I I I I I I
I
3
2
I
I II I I
"
l L.__ __ ~
PICTORIAL 1-6
3 4
I I I I
I I I I I I I I
I I
8 9
10
,
in this area of the circuit board.
II I I
I I I I
12
: 2.7 n (Red-Viol-Gold).
: 2.7 n (Red-Viol-Gold).
79 : 2.7 n (Red-Viol-Gold).
: VR10A
diode (#56-67).
9: 22 kn (Red-Red-Org).
( ~ Solder the leads to the foil and cut
off the excess lead lengths .
5 6
I I I
I I I I I I I
I I I
I I I
13 14 15
1<0
17
7
I

Page 18
The steps performed in this Pictorial are
in this area of the circuit board.
......--~
START•
) Reposition the circuit board as
shown. Solder
the pins to the foil !DENT!FICATION
as you install each part.
ORA WING
NOTE: When you install an IC socket,
insert the pins
into the circuit b.oard
holes.
The index mark on the circuit
board must still be visible after the
socket is installed.
IC socket at QlOlA.
in IC socket at Q102A.
in
IC socket at U102.
14-pin
IC socket at U101.
Q
~
nc=:>
~I
PART
NUMBER
PICTORIAL 1-7
CONTI NU Ev
NOTE: When you install a control, in-
sert
the pins into the circuit board
holes
and solder them to the foil.
~
1 .. .. ~ ...
.... .• ,.;ip'i''>
100 n control (#10-357).