IBM 7090 - Tailgate; Signal Connectors; Power Connector S

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7.6.00

TAILGATE

The

tailgate

area

contains

all

the

signal

and

power

connectors

that

enter

and

leave

the

console.

It

is

located

in

gate

H

of

the

console

frame.

See

Figure

7.

6-1.

7.6.01

Signal

Connectors

The

tailgate

contains

twelve

si~al

connectors,

sometimes

called

"biscuits,"

each

of

which

holds

40

conductors.

7 .

6.

02

Power

Connectors

Three

Winchester

male

power

connectors

are

mounted

at

the

base

of

the

tailgate

assembly,

at

an

angle

to

the

vertical

signal

connector

portion.

They

consist

of

a

104-

conductor,

a

34-conductor,

and

a

75-conductor

connection.

The

104-conductor

cable

contains

the

marginal

checking

control

lines,

the

34-conductor

cable

contains

the

400-

cycle

lines

from

the

power

distribution

frame

(PDF),

and

the

75-conductor

cable

con-

tains

the

60-cycle

power

and

other

miscellaneous

control

lines

to

and

from

the

PDF.

Removal

and

Replacement

Be

sure

the

marginal

check

voltages

are

all

at

normal

before

removing

the

104-

conductor

cable.

The

three-power

connectors

can

be

removed

from

the

console

in

any

order.

When

replacing

cables,

hold

the

connector

with

its

female

lug

on

the

left

side

as

it

faces

the

tailgate.

181

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