Heath HEATHKIT HA8-8 User manual

HEATHKIT
MANUAL
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 ...................................... (6i6i 9 2-3411
Credit ................................................................................... 1616 1 9 2-3561
Replacement Parts ............................................. - .. . 16I61 9 2-3571
Technical Assistance Phone Numbers
8:00 A.M. to 12 P.M. and 1:00 P.M. to 4:30 PM ST Wee*oa,s Only
R/C. Audio, and Electronic Organs (616-9 2-3310
Amateur Radio ............................................................... 1616 1 962-3296
Test Equipment, Weather Instruments and
Home Clocks ................................................................... ;616> 962-3315
Television ................................................................................ (616) 962-33G7
Aircraft, Marine. Security. Scanners. Automotive
Appliances and General Products ...................................... (616 > 962-3 96
Computers .............................................................................. (6l6i 982-3309
YOUR HEATHKIT 90-DAY LIMITED WARRANTY
For a period of ninety (90) days after purchase, Heath Company will replace or repair free of charge any parts that
are defective either in materials or workmanship. You can obtain parts directly from Heath Company by writing us at
the address below or by telephoning us at (616) 9 2-3571. 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, 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: incorrect assembly, the use of
corrosive solder, defective tools, misuse, or fire: or by unauthorized modifications to or uses of our products for
purposes other than as advertised. Our warranty does not include reimbursement for inconvenience, loss of use.
customer assembly or set-up time.
This warranty covers only Heathkit products and is not extended to allied equipment or components used in
conjunction with our products. We are not responsible for accidental 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.
It you are not satisfied with our service (warranty or otherwise) or with our products, write directly to our Director of
Customer Services, Heath Company. Benton Harbor, Michigan 49022. He will make certain your problems receive
immediate, personal attention.
HEATH COMPANY
BENTON HARBOR, Ml. 9022
The Heath Company reserves the right to discontinue products and to change specifications at any time without
incurring any obligation to incorporate new features in products previously sold.

Heathkit® Manual
for the
EXTENDED
CONFIGURATION
BOARD
Model HA -
595-2509-01
HEATH COMPANY
BENTON HARBOR, MICHIGAN 49022
Copyright © 1980
Heath Company
All Rights Reserved
Printed in the United States of America

TABLE OF CONTENTS
Introduction .................................................................. 2
Assembly Notes ............................................................ 3
Parts List ........................................................................ 6
Step-by-Step Assembly .............................................. 8
ircuit Board Assembly .................................... 8
ircuit Board heckout .................................... 19
jumper Wire Assembly .................................... 19
Installation and Operation ...................................... 20
Initial Tests ......................................................... 21
Status Port ........................................................... 23
ROM Disable (ORG 0) ....................................... 24
Side Select ........................................................... 28
Modification Tests ............................................. 30
ircuit Description . ................................................... 31
ircuit Board X-Ray View ...................................... 32
Integrated ircuit Identification ............................ 33
Schematic .......................................................... Fold-in
Warranty .......................................... Inside front cover
ustomer Service ............................ Inside rear cover
INTRODUCTION
The Heathkit Model HA8-8 Extended onfiguration
Board is designed to operate with the Model H8 om 
puter to provide a general purpose status port, ROM
disable (ORGfl), and side select for double-sided disk
drives.

ASSEMBLY NOTES
TOOLS
You will need these tools to assemble your kit.
HEATHKIT
SOLDER I NG
IRON
*T0 REMOVE SOLDER FROM CIRCUIT CONNECTIONS.
ASSEMBLY
1. Follow the instructions carefully. Read the en 
tire step before you perform each operation.
2. 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. Most kits use a separate “ Illustration Booklet ”
that contains illustrations (Pictorials, Details,
etc.) that are too large for the Assembly Manual.
Keep the “ Illustration Booklet ” with the As 
sembly Manual. The illustrations in it are ar 
ranged in Pictorial number sequence.
4. Position all parts as shown in the Pictorials.
5. Solder a part or a group of parts only when you
are instructed to do so.

6. Each circuit part in an electronic kit has its own
component number (R2, 4, 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 if a part
has to be replaced, appear:
— In the Parts List,
— At the beginning of each step where a com 
ponent 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: Avoi eye injury when you cut
off excessive lea lengths. Hol the lea s so they
cannot fly towar 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. 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.
2. 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 stick to
the tip , the tip needs to be cleaned and retinned.
NOTE: Always use rosin core, radio-type solder
(60:40 or 50:50 tin-lead content) for all of the solder 
ing in this kit. This is the type we have supplied with
the parts. The Warranty will be void and we will not
service any kit in which acid core solder or paste has
been used.

Heathkit*
PARTS
Resistors are identified in Parts Lists and steps by
their resistance value in ft (ohms), kft (kilohms), or
Mft (megohms). They are usually identified by a color
code and four or five color bands, where each color
represents a number. These colors (except for the last
band, which indicates a resistor ’ s “ tolerance ” ) will be
given in the steps in their proper order. Therefore, the
following color code is given for information only.
NOTE: Occasionally, a “precision ” or “ power ” resis 
tor may have the value stamped on it.
1/4-WATT
1/2-WATT
1-WATT
— =G=D= —
Multiplier
BANDS: 12 3^ Tolerance
Band 1
1st Digit
Color
Digit
Black
0
Brown 1
Red
2
Orange
3
Yellow
4
Green
5
Blue
6
Violet 7
Gray
White 9
Band 2
2nd Digit
Color Digit
Black
0
Brown 1
Red
2
Orange
3
Yellow
4
Green
5
Blue
6
Violet 7
Gray
White
9
Band 3 (if used)
3rd Digit
Color
Digit
Black
0
Brown
1
Red
2
Orange
3
Yellow 4
Green
5
Blue
6
Violet
7
Gray
White
9
Multiplier
Color Multiplier
Black 1
Brown
10
Red
100
Orange
1,000
Yellow
10,000
Green
100,000
Blue
1,000,000
Silver
0.01
Gold
0.1
Resistance
Tolerance
Color Tolerance
Silver ±10%
Gold ± 5%
Brown ± 1%
Capacitors will be called out by their capacitance
value in /xF (microfarads) or pF (picofarads) and type:
ceramic, Mylar*, electrolytic, etc. Some capacitors
may have their value printed in the following man 
ner:
EXAMPLES:
151K = 15 x 10 = 150 pF
759 = 75 X0.1 = 7.5 pF
First digit of
capacitor's value: 1 ■
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
NOTE: The letter “ R ” may be used at times to signify a
decimal point: as in: 2R2 = 2.2 (pF or /xF).
columns.
DuPont Registered Trademark
MULTIPLIER TOLERANCE OF CAPACITOR
FOR THE
NUMBER:
MULTIPLY
BY:
10 pF OR
LESS
LETTER
OVER
10 pF
0
1 ±0.1 pF
B
1
10 ±0.25 pF
C
2
100
±0.5 pF
D
3 1000
±1.0 pF
F
±1%
4
10,000
±2.0 pF
G ±2%
5
100,000
H
±3%
J
±5%
0.01
K
±10%
9
0.1
M
±20%

PARTS LIST
Unpack the kit and check each part against the follow 
ing list. The key numbers correspond to the numbers
on the “ Parts Pictorial ” . Return any part that is
packed in an individual envelope, with the part
number on it, to the envelope after you identify it
until that part is called for in a step. Do not discard
any packing material until all parts are accounted for.
To order a replacement part, always include the Part
Number and use the Parts Order Form furnished with
this kit. If a Parts Order Form is not available, use one
of the “ Expedited Parts Order Forms ” at the rear of
this Manual, or refer to “ Replacement Parts ” inside
the rear cover. Your Warranty is located inside the
front cover. For prices, refer to the separate “ Heath
Parts Price List. ”
KEY HEATH QTY. DESCRIPTION CIRCUIT
No. Part No. ___________________Comp. No.
RESISTORS — CAPACITORS
NOTE: The following resistors are rated at 1 /4-watt and have a
KEY HEATH
No. Part No.
QTY. DESCRIPTION CIRCUIT
Comp. No.
tolerance of 5%. 5% is indicated by a gold fourth
color band.
A1 6-221-12 2 220 fl (red-red-brn)
resistor
R1, R2,
A1 6-102-12 11 1000 fl (brn-blk-red)
resistor
R3, R4,
R5, R6,
R7, R ,
R9, R11,
R12, R13,
R14
B1
21-761 3
.01 p.F ceramic capacitor C1, C2,
C5
B2 25-221 2
2.2 / j .F tantalum capacitor C3, C4
INTEGRATED CIRCUITS
NOTE: Integrated circuits are marked for identification in one
of the following four ways:
1. Part number.
2. Type number. (This refers only to the numbers; the
letters may be different or missing.)
3. Part number and type number.
4. Part number and a type number other than the one
listed.
C1
443-755 1 74LS04
U4
C1 443-732
1
74LS30
U5
C1 443-77
1
743
U6
C1
443-730 1
74LS74
U3
C1
443-754 1
74LS240
U2
C2
442-54 1 7 05
U1
CAUTION : The following IC can be damaged by static electric 
ity. Do not remove this IC from the conductive foam until you
are instructed to do so in a step.
C1 444-70* 1 ROM IC204
* NOTE: Your integrated circuit may be marked 444-74. Either integrated circuit
will work properly.
CONNECTORS — SOCKETS
D1 432- 65 1 3-connector shell
D2 432- 66 4 Spring connector (3 extra)
D3 432-946 1 25-pin plug
D4 432-9 6 1 3-pin plug
D5 432-1125 2 26-pin socket**
D6 434-29 4 14-pin IC socket
D7 434-311 1 20-pin IC socket
MISCELLANEOUS
E1
E2
E3
E4
E5
60-621 1 -section slide switch
5-2521-1 1 Circuit board
261-29 2 Square foot
340- 12" Bare wire
344-55 6" Green wire
344-92 12" Red wire
43 -55 2 Polarizing plug
Blue and white label
490-1 5 1 Desoldering braid
1 Manual (See Page 1
for part number.)
1 ROM (listing)
Solder
**NOTE: You may have been supplied two 6-pin and two 20-pin sockets instead
of two 26-pin sockets.
SW1

Heathkit
PARTS PICTORIAL
ALWAYS IDENTIFY AN I.C. BY THE
PART NUMBER OR TYPE NUMBER
NOTE: THE STYLE MAY BE SLIGHTLY
DIFFERENT THAN SHOWN.
'a
a
s

STEP-BY-STEP ASSEMBLY
CIRCUIT BOARD ASSEMBLY
CONTINUED
STARTS
( ) 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 procedure
whenever you install parts on a
circuit board.
( ) Solder the resistor leads to the cir 
cuit board 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
LEADS
( ) Position the circuit board as
shown with the printed side (not
the foil side) up.
( ) R5: Hold a 1000 fl (brn-blk-red)
resistor with long-nose pliers as
shown and bend the leads straight
down to fit the hole spacing on the
circuit board.
( ) Push the leads through the holes
at the indicated location on the
circuit board. 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.
2. Then apply solder to the other
side of the connection. IMPOR
TANT: Let the heated lead and
the circuit board foil melt the
solder.
SOL DERI NG
IRON-
SOLDER-
As the solder begins to melt,
allow it to flow around the con 
nection. Then remove the solder
and the iron and let the connec 
tion cool.
SOLDERING
&
SOLDER
( ) ut off the excess lead lengths
close to the connection. WARN 
ING: lip the leads so the ends
will not fly toward your eyes.
PICTORIAL 1-1
( ) heck each connection. ompare
it to the illustrations on Page 9.
After you have checked the solder
connections, proceed with the as 
sembly on Page 10. Use the same
soldering procedure for each
connection.

A GOOD SOLDER CONNECTION
------------------------------------------------------------------------ ,
SOLDER FLOWS OUTWARD
AND GRADUALLY BLENDS /
• 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 The solder will make a good electrical connection between
^the lead and the foil. _
POOR SOLDER CONNECTIONS
ROSIN "
// SOLDER ING
✓ IRON
POSITIONED
SOLDER DOES NOT FLOW
ONTO LEAD. A DARK ROSIN
BEAD SURROUNDS AND IN 
SULATES THE LEAD FROM
THE CONNECTION.
Z z
£''' INCORRECTLY
When the lead is not heated sufficiently, the solder
will not flow onto the lead as shown above. To cor 
rect, reheat the connection and, if necessary, apply a
small amount of additional solder to obtain a good
connection.
SOLDER APPEARS TO FLOW
INWARD AND SET ON TOP
OF THE FOIL.
SOLDERING
IRON
POSITIONED
INCORRECTLY
ROSIN
FOIL
........... ......... "T FT. ____ i .......... .............
When the foil is not heated sufficiently the solder will
blob on the circuit board as shown above. To correct,
reheat the connection and, if necessary, apply a small
amount of additional solder to obtain a good connec 
tion.
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: always take a good look at the foil area around each
lead before you solder it. Then, when you solder the
connection, make sure the solder 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. ” This
is a protective insulation to help prevent solder
bridges.

STARTS
( ) Make sure you installed resistor
R5 in Pictorial 1-1.
( ) R12: 1000 fl (brn-blk-red).
NOTE: eramic capacitors may be in 
stalled either way in the circuit board.
( ) 2: .01 i/,F (103) ceramic
capacitor.
Install three 1000 fl (brn-blk-red) resis 
tors at the following locations:
( ) R3....................................................
( ) RB ....................................................
( ) R4....................................................
( ) 5: .01 p.F (103) ceramic
capacitor.
( ) Solder the leads to the foil and cut
off the excess lead lengths.
CONTINUED
( ) l: .01 p.F (103) ceramic
capacitor.
( ) R2: 220 fl (red- red-brn).
( ) Rl: 220 fl (red-red-brn).
Install six 1000 fl (brn-blk-red) resis 
tors at the following locations:
( ) R14.
( ) R13.
( ) R9.
( ) R7.
Rll.
( ) R6.
( ) Solder the leads to the foil and cut
off the excess lead lengths.
PICTORIAL 1-2

Heathkit*
STARTS
You will install I sockets in the fol 
lowing steps. Be sure the socket pins
are straight and then install the socket
on the circuit board so the index mark
on the board can still be seen. Turn the
circuit board over, be sure there is a pin
in each of the holes, and then solder the
pins to the foil.
OTCH
NDEX
MARK
( ) 14-pin I socket.
( ) 14-pin I socket.
( ) 14-pin I socket.
( ) 14-pin I socket.
( ) 20-pin I socket.
( ) arefully check each socket for
solder bridges between pins. If a
solder bridge has occurred, hold
the circuit board foil-side-down
as shown, and hold the soldering
iron tip between the two points
that are bridged. The solder will
flow down the soldering iron tip.
CIRCUIT
BOARD
IC
SOCKET
7ZZZ.
FOIL
SOLDERING
IRON
WOT
SOLDER
BRIDGE
( )
CONTINUED
) Pl: 3-pin plug. Start the shorter
plug pins into the circuit board
holes as shown and push the plug
down tight against the circuit
board. Then solder the pins to the
foil and cut off any excess pin
lengths.
Ul: 7805 integrated circuit
(#442-54). First bend the leads
straight down as shown. Then in 
sert the leads into the circuit
board holes. Be sure the I is tight
against the circuit board. Then
solder the leads to the foil and cut
off any excess lead lengths.
BEND
LEADS
STRAIGHT
•....DOWN
M

CONTI NU EO
STARTS
( ) ut eight 1" lengths of bare wire.
Use these 1" bare wires in the fol 
lowing steps.
NOTE: When you install each bare
jumper wire in the next step, first form
the wire into a loop as shown. Then
install the wire at the indicated loca 
tion. Position the top of the loop 1/4"
above the circuit board. Then solder
the lead to the foil and cut off any ex 
cess lead lengths.
( ) Install bare jumper wires at the
eight locations indicated.
) SW1: 8-section slide switch.
Mount the switch so the numbers
0 through 7 are away from integ 
rated circuit U1 as shown. Then
solder the lugs to the foil and cut
off any excess lug lengths.
NUMBERS
NOTE: When you install a tantalum
capacitor, match the positive (+) mark,
or color dot on the capacitor with the
positive (+) mark on the board.
POSITIVE
.MARK! + 1
COLOR
DOT
POS ITIVE
MARK ( + 1
( ) 3: 2.2 pF tantalum.
( ) 4: 2.2 p.F tantalum.
( ) Solder the leads to the foil and cut
off the excess lead lengths.
PICTORIAL 1-4
0 14 ’ / 2 3 /< 1
1/8 3/8 I 5/8 . 7/8
i ih|i »i nf 1 i 1 1
(INCHES)
2
3
4
I ,
J —
5
7
I
9
I
1O
6

Heathkit
NOTE: The pin 1 end of inline inte 
grated circuits may be marked in a
number of ways; with a notch, triangle,
dot, the numeral 1, etc.
SHALL
INBEMTATIOM
CONTINUED
PIN 1
Be sure you install each of the follow 
ing I ’ s so its pin 1 end is toward the
index mark on the circuit board.
Before you apply downward pressure
to the I , make sure each pin is cen 
tered in its proper socket hole. Handle
I ’ s with care as their pins are very
easily bent.
Should it ever become necessary to
remove an I , use a screwdriver and
insert it beneath the I ; then gently
rock it up and down to lift the I .
( ) U6: 7438 integrated circuit
(#443-77).
( ) U5: 74LS30 integrated circuit
(#443-732).
( ) U4: 74LS04 integrated circuit
(#443-755).
( ) U3: 74LS74 integrated circuit
(#443-730).
( ) U2; 74LS240 integrated circuit
(#443-754).
PICTORIAL 1-5

PICTORIAL 1-6
NOTE: You may have been supplied two 6-pin and
two 20-pin sockets or two 26-pin sockets. Use the
steps that match your sockets.
26-PIN SOCKETS
Refer to Pictorial 1-6 for the following steps.
( ) Locate the two 26-pin sockets. Then refer to
Detail 1-6A and cut off the indicated lugs at one
end of each socket.
1. Push the socket onto the edge of the circuit
board next to the data jumpers.
2. Make sure the circuit board is between the
two lugs at each socket connector. Also
make sure each lug lines up with a foil on
the circuit board. NOTE: The socket hole
where you cut off the lugs must be between
foil contacts 24 and 25 as shown.
Detail 1-6A
NOTE: Perform the following carefully. The sockets
are very difficult to remove once they are installed
wrong.
( ) Use the following procedure to install one of the
26-pin sockets on the circuit board:
3. Solder only lugs 0 and 24 to the foil on the
component side of the circuit board. The
other lugs will be soldered later.
( ) Similarly, install the remaining 26-pin socket
on the edge of the circuit board next to the other
socket. Make sure the circuit board is between
the two lugs at each socket connector. Also,
make sure each lug lines up with a foil on the
circuit board. NOTE: The socket hole where you
cut off the lugs must be between foil contact 49
and the nearby corner of the circuit board. Sol 
der only lugs 25 and 49 to the foil on the com 
ponent side of the circuit board.

Heathkit
Detail 1-6B
( ) Locate the 25-pin plug. Then refer to Detail 1-6B
and push the longer pins of the plug into the
two 26-pin sockets so that about half of the plug
pins are in each socket.
( ) Adjust the sockets as necessary so they are
parallel to the circuit board. Then solder all the
socket lugs to the circuit board (both sides).
( ) Remove and discard the 25-pin plug.
( ) heck the two sockets to make sure the edges of
each socket are parallel to the surfaces of the
circuit board.

6-PIN AND 20-PIN SOCKETS
Refer to Pictorial 1-7 for the following steps.
NOTE: Perform the following steps carefully. The
sockets are very difficult to remove once they are
installed wrong.
( ) Use the following procedure to install one of the
20-pin sockets on the circuit board:
1. Push the socket onto the edge of the circuit
board next to the data jumpers.
2. Make sure the circuit board is between the
two lugs at each socket connector. Also
make sure each lug lines up with a foil on
the circuit board. NOTE: The lugs at one end
of the socket must line up with foil contact
“0 ” on the circuit board as shown.
3. Solder only lugs 0 and 19 to the foil on the
component side of the circuit board. The
other pins will be soldered later.
( ) Locate a 6-pin socket. Then refer to Detail 1-7A
and cut off the indicated lugs at one end of the
socket.
( ) Push the prepared 6-pin socket onto the edge of
the circuit board next to the 20-pin socket. Make
sure the circuit board is between the two lugs at
each socket connector. Also make sure each lug
lines up with a foil on the circuit board. NOTE:
The socket hole where you cut off the lugs must
be between foil contacts 24 and 25 as shown. Do
not solder any of the lugs yet.
( ) Push the remaining 6-pin socket onto the edge
of the circuit board next to the other 6-pin soc 
ket. Make sure the circuit board is between the
two lugs at each socket connector. Also make
sure each lug lines up with a foil on the circuit
board (foil contacts 25 through 30).
OFF
Detail 1-7A

Detail 1-7B
Refer to Detail 1-7B and cut off the indicated
lugs at one end of the remaining 20-pin socket.
Push the prepared 20-pin socket onto the edge
of the circuit board next to the 6-pin sockets.
Make sure the circuit board is between the two
lugs at each socket connector. Also make sure
each lug lines up with a foil on the circuit board.
NOTE: The socket hole where you cut off the
lugs must be between foil contact 49 and the
nearby corner of the circuit board. Solder only
lugs 31 and 49 to the foil on the component side
of the circuit board.
( ) Locate the 25-pin plug. Thenreferto Detail 1-7
and push the longer pins of the plug into the
four sockets as shown.
( ) heck the four sockets to make sure the edges of
each socket are parallel to the surfaces of the
circuit board.
( ) Adjust the sockets as necessary so they are
parallel to the circuit board. Then solder all the
socket lugs to the circuit board (both sides).
( ) Remove and discard the 25-pin plug.
Detail 1-7C

PICTORIAL 1-8
Refer to Pictorial 1-8 for the following steps.
( ) Locate the two polarizing plugs. Then push the
plugs into the holes of the 26-pin sockets where
you cut off the lugs.
( ) arefully peel the backing paper from a square
foot. Then press the foot onto the component
side of the circuit board in the location shown.
( ) Position the circuit board as shown in Pictorial
1-9 with the component side away from you.
( ) arefully peel the backing paper from the re 
maining square foot. Then press the foot onto
the foil side of the circuit board in the location
shown in Pictorial 1-9.
PICTORIAL 1-9
2
0 % 1 / 2 % 1
I 1/8 3/8 I 8/8 . 7/8 I
l^ii A'd 1 i' h ' J
O 5 1 (CM) 2
T
3
(INCHES)
1 > 1 r ■.
3 4 5 6 7
7 8 9 10 11 12 13 1 18 18 17