Paia 8700 Guide

T.M.

8700

COMPUTER/CONTROLLER

ASSEMBLY

AND

USING

MANUAL.

PAIA

Electronics,

Inc.,

1020 W.

Wilsbire

Blvd.,

Oklahoma

City,

OK 73116

8700

ASSEMBLY

The

PAIA 8700 COMPUTER/CONTROLLER

is

assembled

on

the

double-

sided,

plated

through

...

hole,

etched

circuit

board

provided.

Unlike

other

PAIA

circuit

boards,

this

board

has

all

conductive

traces

pre-tinned

for

easy

solderability

and

does

not

require

scrubbing

before

assembly.

Also unlike many

other

PAIA

circuit

boards,

the

8700

board

is

oomplex;

and on

complex

boards,

unintended conducting

paths

between

conductors

(particularly

where

a

conductor

passes

between pins

on

an

IC)

are

not

unheard

of. While

all

reasonable

quality

control

precautions

have

been

taken,

it

is

a

wise

assembler

who

will

spend

several

minutes

closely

ex-

amining

the

circuit

board

for

these

unintentional

bridges.

Prints

of

the

circuit

board

artwork

have

been

provided

for

this

purpose

in

figures

(1)

and(2).

Bridges

(particularly

on

the

component

side

of

the

board)

will

be

particularly

difficult to find

once

sockets

and

other

components

are

in

place.

Because

of

the

close

proximity

of

some

conductors

to

one

another,

extreme

care

should

be

exercised

during

soldering

to

prevent

unintentional

solder

bridges

during

assembly.

The

likelihood

of

assembly-caused

bridges

has

been

lessened

by

laying

out

the

board

with

an

absolute

minimum

number

of

conductors

passing

between

IC

pins

on

the

soldered

side

of

the

board,

but

care

is

nevertheless

advised.

Use a

clean,

low-wattage

iron

for

soldering

(40

watts

max.).

While

most

temperature-sensitive

components (with

the

exception

of

discrete

tran-

sistors)

are

mounted

in

sockets,

excessive

temperature

can

weaken

or

destroy

the

bond

between

the

conducting

copper

and

the

fibre-glass

board

material.

All

sockets

and

other

components

are

mounted on

the

side

of

the

board

with

the

silk-screened

parts

placement

designators

and

soldered

from

the

opposite

side

ONLY.

00

NOT SOLDER COMPONENTS ON BOTH SIDES

OF

THE BOARD.

NOT

ALL

HOLES

ON

THE cmcuIT BOARD WILL HAVE A PART

ASSOCIATED WITH THEM. Many

of

the

holes

are

conductive

pass-throughs

from

one

side

of

the

board

to

the

other

while

others

are

holes

reserved

for

mounting optional

components.

Some

manufacturers

recommend

filling

through-board

holes

with

solder

to

insure

that

a conductive

path

is

established

from

one

side

of

the

board

to

the

other.

If

you

elect

to do

this,

make

sure

that

you

know which

holes

are

which.

It

is

for

all

practical

purposes

im-

possible

to mount a component

in

a

plated-through

hole

that

has

been

filled

with

solder.

NOT

ALL

PART NUMBERS ARE USED

ON

THIS CffiCUIT BOARD,

some

part

numbers

(

e.

g.

R4)

are

reserved

for

future

expansion.

3

~

:

.......

'-4_•--=

-

-D~__...,

••

·=

=

~~----=·

o-!!-.._

- - - •

-

---

--:----....•

=

-

--=-

-::::.-

-

4

•• •

1

• •

-

--

-

--

-- -

----

---

--

- - --

„ „ „ „ „ „ „

••

•

-

---

---•

•

-

• •

··~~-i

--

·-:tr:~

:

:'\.~-

:J/:

~-------;;-~

- - -

•••••

~==----=

FIGURE

2 -

CIRCUIT

BOARD

FOIL

PATTERN

5

FIGURE

3

8700

COMPUTER/CONTROLLER

PARTS

PLACEMENT

When mounting

components

such

as

resistors,

diodes

and

capacitors,

the

leads

of

the

part

should

be

passed

through

the

mounting

hole

and

then

bent

to a

slight

angle

to

hold

the

part

in

place

for

soldering.

00

NOT

"cinch"

the

leads

directly

against

the

board

(bend

to

a 90° angle).

This

technique

while

great

for

the

government

(and

others

who

are

in

the

habit

of

throwing

away

things

that

don't

work)

provides

only

marginal

additional

mechanical

strength

and

makes

removing

malfunctioning

components

extra-ordinarily

difficult.

AND

REMEMBER.

..

pre-tinned

boards

require

very

little

additional

solder.

With

all

of

these

DOs

and

OON'Ts

out

of

the

way,

we

begin:

HAVE

YOU

INSPECTED THE BOARD?

It

might

just

save

you

a

lot

of

trouble.

U

sing

parts

placement

designators

and

the

parts

placement

drawing

in

figure

3

as

guides,

solder

the

following

resistors

in

place.

Notice

that

many

of

these

r~sistors

are

close

together

and

consequently

may

need

tobe

"stacked"

as

shown to

the

left.

Note

that

resistors

are

non-polarized

components

and

that

either

lead

may

be

placed

in

either

hole

without

affecting

performance.

Installation

of

all

resistors

within

a

given

group

before

any

of

the

resistors

in

the

group

are

soldered

in

place

is

highly

recommended.

ABC

1111,

1 '

Silver

or

gold -

disregard

this

band.

,PART NUMBER(s) VALUE COLOR CODE

A-B-C

(

v5/Rl

-R3 (3

parts).

„

...

3300

ohms.

„ „

„.

orange-orange-red

"#'

/'f.:."

(

'')

1

R5

............................

3300

ohms

........

orange-orange-red

<J

R6

- R 13 (8

parts)

..

„.27K„„

...

„.„

.....

red-v~olet-orange

(

,)

R14 -R21 (8

parts)„

..

27K„„

..„

...

„„

...

red-v1olet-orange

(<YR22

..........................

27K.

................

red-violet-orange

('/) R23 -R25

(3

parts)

....

27K.

................

red-violet-orange

(

")

.;R.26

-R30

(5

parts)„„

lOK.„.„„

.....

„ ..

brown-black-orange

(

jt

1R31 -R37

(7

parts).

„.

lOK„

...

„

........

„

brown-black-orange

(~

) R38 -R45 (8

parts)„

..

lOK„„„.„„„„„brown-black-orange

Install

the

following

ceramic

disk

capacitors.

Like

resistors,

these

components

arenon-polarized

and

either

lead

may

be

installed

in

either

of

the

holes

provided.

;''

(/)

Cl-C7

(7

parts)„„

„ „

.•

05

mfd

disk

(1 C9„..

„„

„.

„„.„

...

„„„„.

05

mfd

disk

V)

Cll,

C12 (2

parts)„.„„.

05

mfd

disk

(V)

C8

............................

33 pfd.

disk

Install

the

Integrated

Circuit

sockets.

Note

that

four

different

socket

sizes

have

been

supplied;

14

pin,

16

pin,

24

pin,

and

28 pin.

00

NOT INSTALL

ANY

OF

THE

INTEGRATED CIRCUITS AT THIS

TIME!

When

installing

the

sockets;

note

that

there

is

a

small

notch

at

one

end,

between

the

rows

of

pins.

This

notch

should

correspond

to

the

notch

on

the

circuit

board

graphics

for

convenient

reference

later

on. 7

8

Install

the

14 pin

sockets

(17

supplied)

in

the

following

locations

Jl

J5

IC5

IClO

IC21

J2

!Cl

IC7

ICll

/

(

\)

J3

( ) IC3

( ) IC8

( ) IC12

( )

J4

IC4

IC9

IC13

Install

the

16 pin

sockets

(9

supplied)

in

the following

locations

( )

.)

'

;·

IC2

IC23

IC31

t

(l,

)

<

(

\~

IC6

IC26

(.

) IC14

( ) IC29 ( ) IC22

( ) IC30

(

!~

Install

the

24

socket

supplied

at

the

location of

IC

19

(

J)

Install

the

28

socket

supplied

at

the

location of IC15

J)

Install

the

3 pin power

connector

at

the

location

indicated

as

J6.

Note that

this

connector

i$ keyed by

the

shape

of

its

base

and

must

be

installed

properly.

(see

figure

on

page

27)

Install

the

8

discrete

transistors.

Note

that

the

transistors

are

keyed

by

the

flat

on

the

side

of

their

cases

and

must

be

installed

properly

for

proper

operation.

Because

of

later

mechanical

assemblies,

it

is

also

important

that

the

transistors

seat

as

closely

as

possible

to

the

board.

The

tops

of

the

transistors

ßhould

be

no

more

than

3/8"

above

the

surface

of

the

board.

. J

( )

QO

)

Q4

(

/>

Ql

(

i)

Q5

(~

)

Q2

(\)

Q6

Q3

Q7

Install

the

three

ln914

diodes

provided.

Like

the

transistors,

these

parts

are

polarized

and

must

be

installed

so

that

the

banded

end of

the

diode

co~responds

to

the

band

indicated

on

the

circuit

board

graphics.

I \

(L

)D3 (

)>n4

V )D5

\

'

Like the

IC's,

the

seven-segment

displays

are

socketed,

but

since

the

pins

on

the

displays

are

not to

standard

tolerances,

Molex

pins

must

be

used

to

mount

these

parts.

The

molex

pins

are

tied

together

at

the

top by a

metal

strip

referred

to

as

a

"carrier",

and to

be

perfectly

correct

the

carrier

should

be

on

the

outside

of

the

two

strips

that

will

constitute

the

socket.

The

molex

pins

are

supplied

in

a continuous

strip

and

must

be

cut

into lengths of 5 pins

each

prior

to

installation

on

the

circuit

board.

Install

and

solder

the

four

rows

of

molex

pins

at

the

IC27 and IC28

locations.

Snap off

the

carrier

strip

after

the

pins

are

soldered

in

place.

We

are

now

ready

to

begin

installing

the

lntegrated

Circuits,

but

first

a

brief

explanation of

where

we're

headed.

The

chances

are

good

that

with

careful

assembly

the

8700

Computer/Controller

will

be

ready

to

operate

when

power

is

first

applied.

Nevertheless,

it

is

a good

idea

to

go

through

the

"power-up"1"

procedure

that

we

will

outline.

The

procedure

entails

the

use

of

an

oscilloscope

and should

be

used

by anyone

with

access

to

one

of

these

devices.

If

you

absolutely

cannot

get

a

scope

to

use,

you

may

skip

this

procedure,

but

for

those

who

can

use

it,

it

will

give

you confidence

in

certain

sections

of

the

computer

and

simplify

trouble-shooting

procedures

in

the

event

that

there

is

a

failure

when

the

unit

is

fully

assembled.

Open

the

integrated

circuit

package

and

install

the

following

integrated

circuits

in

their

respective

sockets.

Notice

that

the

orientation

of

the

ICs

is

keyed

by

a

semi-circular

notch

at

one

end

of

the

device,

and

that

the

position of

this

notch

should

correspond

with

the

notch

that

is

part

of

the

circuit

board

graphics.

WARNING CMOS cmcurrs

Some of

the

integrated

circuits

used

in

this

kit

are

Complementary

Metallic

Oxide

Semiconductors

(CMOS). While

state

of

the

art

internal

protection

is

provided,

these

circuits

are

still

susceptible

to

damage

from

STATIC ELECTRICITY. You should

not

experience

any

difficulties

if

you

observe

the

following

precautions.

1)

The

circuits

are

supplied

to

you

inserted

in

blocks

of

conductive

foam.

Leave

them

in

these

blocks

until

you

are

ready

to

install

the

part

•.

2)

Do

not

install

the

parts

in

sequence

other

than

that

called

for

in

the

instructions.

3)

Do

not

wear

synthetic

(

e.

g.

nylon) clothing while handling

these

parts.

Inst

all

the

following

IC

s

in

their

sockets.

NOTE: FND 357

displays

are

k~.yed

by

a

series

of

small

grooves

on

their

top edge•

.

,.

( l

ICl

74LSOO

(i

) IC2 4042

()

IC3

~

JIC4 4001 ( ) IC5 4011 ( ) IC6

IC7 4001 ( ) IC8 4001 ( ) IC9

:l

IClO 74LS02 ( )

ICll

4001 ( ) IC12

IC13 4011 ( ) IC14 4556 ( ) IC15

~···

~

IC21 4001 ( ) IC26 9368 ( ) IC29

IC27 FND 357 Display ) IC28 FND 357

4001

4042

4011

6503

9368

This

should

leave

you

with

5

ICs

that

have

not

been

installed;

four

2112 RAMs and one

170'/A PIEBUG

monitor

PROM.

(A U

sing

a

section

of

resistor

clipping,

form

and

install

the

jumper

indicated

as

S2

on

the

parts

placement

diagram.

Leave

a

generous

loop

in

this

jumper

as

it

will

be

cut

open

later.

9

10

The

jumper

that

was

installed

above

enables

a

test

feature

of

the

8700,

described

in

the

"Self

Test"

section

of

this

manual,

you should

at

this

point ski.p to

that

section

and

perform

the

tests

outlined

there.

Return

to

tllis

point

for

final

assembly

when

the

procedure

outlined

has

been

·com.pleted.

v{/

Clip

the

jumper

:i.nstalled

as

S2

in

a

into two

sections

and

spread

the

sections

apart

so

they do

not

touch, but so

that

they

may

be

re-soldered

if

needed.

<j(

Using a section

of

excess

resistor

lead,

form

and

install

the

jumper

indicated

as

Sl

on

the

circuit

board

graphics.

(This

jumper

enables

"normal"

operation

of

the

system,

and

~

be

in

place

for

the

unit to function

properly.

·

c6

In.stall

the

rema:i.ning

Integrated

Circuits

in

their

respective

soc~ets

(observe

. . • 1

orientation

markings).

i

d)

IC22

(~)

IC31 2112

2112

/

<(>

( ) IC23

IC19 2112

1702A PROM

{

<\t

IC30 2112

This

completes

assembly

of

the

8700 CPU

board.

Proceed

to

assembly

of

the

8700A

active

keyboard.

·

87

00

/A KEYBOARD ASSEMBLY

Prepare

for

asseinbly

by

thoroughly

cleaning

the

exposed

copper

circuitry

above

colored

keyboard

area.

U

se

steel

wool

and/

or

scouring

cleanser.

00

NOT

USE

PRE-SOAPED

STEEL

WOOL

PAD.

Use

particular

care

to

avoid

scratching

the

printed

keyboard

area.

Rinse

and

dry

the

board

completely

before

beginning

assembly.

A

WORD

OF

ADVICE:

-

Do

not

clean

th~

circuit

board

until

you

are

ready

to

assemble

and

test

this

unit. When

assembly

is

complete

and

the

unit

verified

as

being

operational,

a

coat

of

artist

1

~

spray

fixative (

available

at

most

artist

1

s/

,

engineers

supply

stores;

e. g.

11

Blair

Spray

Fix'')

will

keep

the

copper

bright

and

shiny and

prevent

oxidation.

DO

NOT

try

to

protect

the

copper

with any

oil-based

sprays

as

these

may

entrain

moisture

or

otherwise

become

conductive;

NOTE

that

there

are

no

sockets

used

in

the

8700/

A.

And finally,

just

so

there

is

no confusion,

the

parts

are

mounted

on

the

side

of

the

board

marked

"ICl",

11

Rl

11

9

etc.

·

ABC

l_l

l_l,

__

I ,

Silver

or

gold

-

disregard

this

band.

Begin

assembly

by

soldering

all

resistors

in

place

as

per

the

parts

placement

designators

printed

on

the

circuit

board

and

the

detail

figure

4.

Figure

4

DESIGNATION VALUE COLOR CODE

A-B-C

(})

Rl

-R16 (16

resistors)

.........

82K

....................

grey-red-orange

( )

Rl

7 - R20 ( 4

resistors)

.........

lOOK

.....................

brown-black-yellow

( ) R21 -R24 ( 4

res~stors)

.........

150K

.....................

bro~-green-yellow

( ) R25-R48 (24

res1stors)

.........

27K

.......................

red-v1olet-orange

T~~re

are

13

solid

wire

jumpers

used

on

this

board.

for7/a'.nd

install

these

jumpers.

(

~··

Form

and

install

13

jumpers.

Count

them.

(1

Locate

the

RESET

push-button

(Sl

) and

prepare

it

for

installation

by

using

a

pair

of

needle-nose

pliers,

to

carefully

bend

its

two

solder

lugs

out

to

90°

angles

as

/

1·

shown

in

detail

figure

5.

( )

Cut

the

length

of

insulated

wire

provided

into two

equal

5-inch

lengths,

strip

1/4

inch

of

insulation

from

each

end

of

each

wire

and

twist

and

tin

the

exposed

ends.

Solder

one

end

of

each

of

the

lengths

to

the

lugs

of

the

switch.

U

sing

the

solid

wire

provided,

SOLDER

TWO

LENGTHS

OF

INSULA

TED

WIRE

Figure

5

11

Paia 8700 Guide

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