DSI R-110 User manual

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August

13,

1991

WO

MAINTENANCE

MANUAL

FOR

THE

R-110

and

R-110B

RECEIVERS

THIS

MANUAL

IS

INTENDED

FOR

USE

WITH

THE

FOLLOWING

SERIAL

NUMBER:

i

Dynamic

Sciences

International

Inc.

6130

Variel

Avenue

Woodland

Ilills.

CA

91367

(818)226-6262

Fax:(818)

226-6247

SECTION

5.

MAINTENANCE

5.1

Introduction

Three

levels

of

maintenance

are

discussed

in

this

section:

preventive

maintenance,

periodic

maintenance,

and

corrective

maintenance.

Periodic

maintenance

is

part

of

preventive

maintenance

and

includes

a

receiver

performance

test.

Failure

of

a

particular

part

of

the

performance

test

should

lead

to

initiation

of

corrective

maintenance,

and

will

indicate

a

starting

point

for

fault

isolation.

Isolation

procedures

are

provided

down

to

at

least

the

module

level.

Disassembly

procedures

are

also

provided

as

an

aid

to

service

personnel.

Finally,

field

calibration

procedures

are

included

both

for

periodic

maintenance

and

for

replacement

of

failed

assemblies.

Procedures

for

adjustments

which

may

be

made

at

the

factory

before

shipment

and

which

should

never

need

recalibration

are not

included.

§.2

Preventive

Maintenance

Preventive

maintenance

includes

correct

installation

and

connection

of

the

radio,

periodic

inspection

and

cleaning,

and

execution

of

the

receiver

performance

test.

See

table

5-1.

The

model

R-110

receiver

requires

a

minimum

of

periodic

maintenance

unless

abusive

conditions

exist.

Such

conditions

include

improper

handling,

mounting,

and

operation,

or

environmental

extremes.

§.2.1

Performance

Test

The

performance

test

consists

of

a

procedure

which,

if

followed

all

the

way

through,

will

demonstrate

that the

receiver

is

in

good

operating

condition.

The

performance

test

makes

no

attempt

to

verify

all

specifications,

as

would

an

acceptance

test

procedure,

but

is

rather

intended

to

verify

its

basic

operation.

A

full

verification

of

the

radio’s

specifications

requires

execution

of

the

ATP.

Test

equipment

required

by

the

performance

test

is

listed

in

table

5-2.

Receiver

test

points

used

by

the

performance

test

are

indicated

in

figure

5-1.

A

sample

data

sheet

for

recording

the

results

of

the

performance

test

is

given

in

paragraph

5.2.1.2.15,

Field

service

adjustment

procedures

are

provided

at

the

end

of

this

section.

R-110

Technical

Manual

Page

5-1

Table

5-1:

Preventive

Maintenance

Task

Interval

Description

Inspect

Cables

4

Months

Check

for

frayed cables

and

wires.

Check

that

wires

and

coax

cables

are

not

crimped

between

structural

members.

Inspect

connectors.

Inspect

and

clean

air

inlet

filter

4

Months

Visually

check

for

accumulated

dirt;

if

excessive,

remove

dirt

and

other

deposits

with

a

vacuum

cleaner

or

compressed

air.

Inspect

plug-in

modules

12

Months

Look

for

discoloration

of

resistor

and

capacitor

coding

bands

or

loss

of

coating

that

would

indicate

abnormal

operation

such

as

extreme

heat

conditions.

Clean

connectors

12

Months

Dissolve

and

wipe

away

any

grease

deposits

on

front

and

rear

panel

connectors.

Use

a

cotton

swab

dipped

in

Freon

TF

or

alcohol.

Clean

chassis

12

Months

Wipe

all

dust

and

grease

from

the

interior

and

exterior

chassis

parts.

||

Execute

performance

test

and

alleviate

any

identified

faults

12

Months

Perform

thorough

testing

of

the

receiver

to

ensure

that

specified

performance

is

maintained.

Table

5-2:

Test

Equipment

for

the

Performance

Test

Type

Specifications

Example

Signal

Generator

10

Hz

-

1280

MHz

Hewlett

Packard

8662A

AM,

CW

Spectrum

Analyzer

10

kHz

-

1.8

GHz

Tektronix

7L14

Oscilloscope

300

MHz

Bandwidth

Tektronix

2465

Frequency

Counter

10

Hz

-

3

GHz

Hewlett

Packard

5386A

IEEE-488

Controller

Computer

With

Directly

HP-85

(Optional)

Controllable

Interface

R-110

Technical

Manual

Cc

CELE

ELE

OSCILLO-

SIGNAL

SCOPE

GENERATOR

“9

Ea}

SOB

|

Ab.

eon

(Co)

ae

aoe

O|

+

|

You

Peet

COS

||

eRe

:

Y

32

=}—(0-0,8,.0.2,,

7'F

(|

Yes

:

O

D

yo

|

Yue

woe

@

HY.

rm

|

8.

@

4

’

ra

@—

fd

=

en

imrO—,

4

——(F_

117/220

VAC

PUCUGCUO

UO

RUO

RD

ERT

eae

eeees

SPECTRUM

ANALYZER

now

Qi".

‘

Figure

5-1:

Test

Points

for

the

Performance

Test

R-110

Technical

Manual

Page

5-3

§2.1.1

Setup

The

performance

test

is

based

on

a

standard

test

setup.

This

is

as

follows:

C

©

The

radio

is

in

its

powerup

condition:

Tuned

frequency

=

100

MHz

Input

select

=

input

#1

Input

attenuation

=

20

dB

Gain

=

50

dB

Bandwith

=

1

MHz

Detection

=

linear

BFO,

Z

axis,

autorange,

AGC

disabled

Tune

mode

selected,

1

MHz

tuning

display

digit

selected

for

tuning

©

A

signal

generator

is

connected

to

the

radio’s

#1

input:

Frequency

=

100

MHz

Amplitude

=

-60

dBm

Modulation

=

unmodulated

CW

©

‘The

radio’s

#2

input

is

terminated

in

50

Ohms.

©

A

spectrum

analyzer

is

connected

to

the

radio’s

21.4

MHz

IF

monitor

jack

(not

the

"signal

monitor"

jack):

Center

frequency

=

21.4

MHz

Reference

=

+10

dBm

C

©

An

oscilloscope

is

connected

to

the

radio’s

video

output

jack

through

a

50

Ohm

feed-through

terminator:

Sensitivity

=

0.5

V/div

Coupling

=

DC

Trace

position

=

bottom

of

screen

Many

of

the

test

steps

will

call

for

variations

on

this

basic

setup.

These

variations

will

be

described

at

the

point

at

which

they

are

required.

Page

5-4

R-110

Technical

Manual

§.2.1.2

Procedure

The

performance

test

procedure

is

functionally

divided

into

a

number

of

test

headings,

each

of

which

typically

contains

a

number

of

steps

to

be

performed.

§2.12.1

Front

Panel

Operation

This

test

verifies

the

operation

of

those

front

panel

controls

and

displays

which

interface

with

the

controlling

microprocessor.

Note

that

this

is

a

test

of

the

controls

only,

not the

functions

associated

with

them.

Not

included

are

the

BFO,

Z

axis,

and

audio

gain

control

knobs.

Several

of

the

status

indicators

are

also

not

included

because

they

require

special

equipment,

or

require

that

a

hardware

fault

be

induced.

Some

of

these

indicators

will

be

exercised

in

subsequent

tests.

For

this

test

the

standard

test

setup

is

not

required.

An

oscilloscope

is

required

for

the

X

axis

test.

1,

Press

the

RF

input

select

pushbuttons

one

at

atime.

Pressing

one

of

these

buttons

should

cause

its

internal

indicator

LED

to

illuminate,

and

the

LED

in

the

opposite

pushbutton

to

extinguish.

Press

the

RF

input

attenuation

stepping

pushbuttons

one

at

atime.

They

should

cause

the

value

indicated

on

the

attenuation

display

to

step

up

and

down.

Rotate

the

IF

gain

control

knob

in

both

directions.

The

rotation

should

cause

the

value

indicated

on

the

gain

display

to

step

up

and

down.

Press

the

IF

bandwidth

stepping

pushbuttons

one

at

a

time.

They

should

cause

the

value

indicatated

on

the

bandwidth

display

to

step

up

and

down.

Rotate

the

tuning

knob

in

both

directions.

The

rotation

should

cause

the

value

indicated

on

the

tuning

display

to

step

up

and

down,

with

the

step

size

based

on

the

selected

(blinking)

display

digit.

Press

the

tuned

frequency

stepping

pushbuttons

one

at

atime.

They

should

cause

the

value

indicated

on

the

tuning

display

to

step

up

and

down,

with

the

step

size

based

on

the

selected

(blinking)

display

digit.

Enter

the

sequence

"1234567890."

on

the

keypad.

The

digits

should

be

shown

on

the

tuning

display

as

they

are

entered.

Now

press

the "C"

key.

The

display

should

revert

to

its

previous

indication.

Enter

the

sequence

"1K".

The

display

should

indicate

1

kHz.

Enter

the

sequence

"1M".

The

display

should

indicate

1

MHz.

Enter

the

sequence

"1000H".

The

display

should

indicate

1

kHz.

Press

the

log

detector

pushbutton.

Its

internal

indicator

LED

should

illuminate.

Press

it

again and

the

LED

should

extinguish.

Press

the

BFO

enable

pushbutton.

Its

internal

indicator

LED

should

illuminate.

Press

it

again and

the

LED

should

extinguish.

R-110

Technical

Manual

Page

5-5

10.

11,

12.

Page

5-6

Press

the

Z

axis

enable

pushbutton.

Its

internal

indicator

LED

should

illuminate.

Press

it

again

and

it

should

extinguish.

With

the

Z

axis

enable

pushbutton

indicator

LED

illuminated,

press

the

Z

axis

invert

pushbutton.

Its

internal

indicator

LED

should

illuminate.

Press

it

again

and

the

LED

should

extinguish.

Press

the

STEP

pushbutton

below

the

tuning

display.

Its

internal

indicator

LED

should

illuminate.

Press

it

again

and

the

LED

should

extinguish.

With

the

STEP

pushbutton

indicator

LED

extinguished,

press

the-SELECT

pushbutton

a

few

times.

The

blinking

digit

selection

on

the

tuning

display

should

move

left

and

then

wrap

around

to

the

right

end

of

the

display.

With

the

STEP

pushbutton

indicator

LED

extinguished,

press

the

SELECT>

pushbutton

a

few

times.

The

blinking

digit

selection

on

the

tuning

display

should

move

right

and

then

wrap

around

to

the

left

end

of

the

display.

Press

the

alt

mode

pushbutton

in

at

the

bottom

right

of

the

keypad.

Its

internal

indicator

LED

should

illuminate.

Press

it

again

and

the

LED

should

extinguish.

Enable

autorange.

The

AUTO

indicator

should

illuminate.

Disable

it

and

the

indicator

should

extinguish.

Enable

AGC.

The

AGC

indicator

should

illuminate.

Disable

it

and

the

indicator

should

extinguish.

Enable

absolute

gain

display

mode.

The

ABS

indicator

should

illuminate.

Disable

it

and

the

indicator

should

extinguish.

Enable

delta

gain

display

mode.

The

DELTA

indicator

should

illuminate.

Disable

it

and

the

indicator

should

extinguish.

Enable

CW

gain

distribution

mode.

The

CW

DIST

indicator

should

illuminate.

Disable

it

and

the

indicator

should

extinguish.

Enable

external

wideband

mode.

The

WIDE

indicator

should

illuminate.

Disable

it

and

the

indicator

should

extinguish.

Set

the

bandwidth

to

1

MHz

and

the

tuned

frequency

to

1

MHz.

The

BW

LIM

indicator

should

illuminate.

Set the

tuned

frequency

to

100

MHz

and

the

indicator

should

extinguish.

Set

the

bandwidth

to

10

kHz

and

the

tuned

frequency

to

100

MHz.

Select

the

1

MHz

tuning

display

digit

for

tuning.

The

BW

GAP

indicator

should

illuminate.

Select

1

MHz

bandwidth

and

the

indicator

should

extinguish.

The

AC

HI,

AC

LO,

REG,

LOCK,

FR

OVL,

BK

OVL,

MDC,

and

THRESH

indicators

should

all

be

extinguished.

R-110

Technical

Manual

“

.

14.

Enter

tune

mode.

The

TUNE

mode

indicator

should

illuminate.

All

other

operating

mode

indicators

should

be

extinguished.

Enter

start

mode.

The

START

mode

indicator

should

illuminate

and

the

TUNE

mode

indicator

should

extinguish.

Enter

stop

mode.

The

STOP

mode

indicator

should

illuminate

and

the

START

mode

indicator

should

extinguish.

Enter

step

mode.

The

STEP

mode

indicator

should

illuminate

and

the

STOP

mode

indicator

should

extinguish.

Enter

rate

mode.

The

RATE

modc

indicator

should

illuminate

and

the

STEP

mode

indicator

should

extinguish.

Enter

scan

mode.

The

SCAN

mode

indicator

should

illuminate

and

the

RATE

mode

indicator

should

extinguish.

Enter

store

mode.

The

STORE

mode

indicator

should

illuminate

and

the

SCAN

mode

indicator

should

extinguish.

Enter

recall

mode.

The

RCL

mode

indicator

should

illuminate

and

the

STORE

mode

indicator

should

extinguish.

Enter

reset

mode.

The

RESET

mode

indicator

should

illuminate

and

the

RCL

indicator

should

extinguish.

15.

Set

up

the

following

scan

parameters:

Start

frequency

=

100

MHz

Stop

frequency

=

200

MHz

Step

size

=

1

MHz

Step

rate

=

1

step/second

Repeat

=

none

Connect

an

oscilloscope

to

the

X

axis

output

connector.

Set

it

for

continuous

monitoring

of

DC

over

a0Q-

10

Volt

range.

The

initial

voltage

should

be

zero.

Initiate

an

upward

scan

using

the

SELECT

pushbutton.

The

indicator

LED

inside

the

pushbutton

should

illuminate

and

the

scan

should

commence.

Time

the

scan

to

completion.

It

should

require

100

seconds.

The

indicator

LED

inside

the

pushbutton

should

extinguish

at

the

end

of

the

scan.

The

X

axis

output

should

proceed

linearly

from

0

to

+10

Volts

during

the

course

of

the

scan.

Initiate

a

downward

scan

using

the-SELECT

pushbutton.

The

indicator

LED

inside

the

pushbutton

should

illuminate

as

the

scan

commences.

It

should

extinguish

at

the

end

of

the

scan.

16.

Select

front

panel

beep

volume

adjustment

mode

and

rotate

the

tuning

knob

back

and

forth.

The

piezo

transducer

should

sound

and

the

volume

should

vary

with

the

tuning

knob

position.

Plug

a

speaker

or

headphone

into

the

audio

jack

and

select

audio

beep

volume

adjustment

mode.

Rotating

the

tuning

knob

back

and

forth

should

produce

an

audible

indication

through

the

speaker

at

varying

volume

levels.

R-110

Technical

Manual

Page

5-7

17.

Select

display

brightness

adjustment

mode

and

verify

that

the

LED

matrix

character

displays

may

be

dimmed

and

extinguished.

§.2.12.2

Power

Supply

Monitor

There

are

three

power

supply

status

monitor

indicators

on

the

front

panel

of

the

radio,

for

AC

line

high,

AC

line

low,

and

DC

regulation.

While

it

is

not

advisable

to

deliberately

induce

a

regulation

fault,

it

should

be

possible

to

exercise

one

or

both

of

the

AC

line

monitors

by

adjusting

the

range

switch

on

the

rear

panel.

Note

that

this

test

does

not

require

the

test

equipment

used

by

the

standard

test

setup.

1.

‘It

is

assumed

that

the

120

VAC/220

VAC

selection

was

properly

made

before

initial

use

of

the

radio.

2.

Rotate

the

AC

subrange

switch

on

the

rear

panel

across

its

range.

If

the

mains

voltage

is

nominal

then

one

extreme

setting

should

cause

the

AC

HI

indicator

on

the

front

panel

to

illuminate,

while

the

other

extreme

should

cause

the

AC

LO

indicator

to

illuminate.

3.

At

least

one

setting

of

the

AC

subrange

switch

should

cause

both

AC

line

indicators

to

extinguish.

If

more

than

one

setting

does

this

then

choose

the

one

which

is

in

the

middle

for

normal

use.

§2123

Reference

Oscillator

Output

Note

that

this

test

does

not

require

the

test

equipment

used

by

the

standard

test

setup.

It

does

require

a

frequency

counter,

however.

1.

Connect

a

frequency

counter

to

the

reference

oscillator

output

jack

on

the

rear

panel

of

the radio.

The

radio

must

be

warmed

up

for

at

least

1

hour.

2.

Measure

the

frequency

at

the

monitor

connector.

It

should

be

20

MHz

to

within

a

couple

of

Hz.

§.2.1.2.4

RF

Input

Selection

This

test

exercises

the

RF

input

select

relay.

It

is

also

the

first

throughput

test

of

the

signal

path,

so

that

many

other

problems

may

first

show

up

here

as

well.

1.

Begin

with

the

standard

test

setup

described

in

paragraph

5.2.1.1.

A

clear

signal

should

be

present

from

the

IF on

the

spectrum

analyzer

screen

and-a

DC

offset

from

the

video

should

be

indicated

on

the

oscilloscope.

2.

Select

RF

input

#2

without

moving

the

signal

generator

connection.

The

indications

on

the

spectrum

analyzer

and

the

oscilloscope

should

fall

to

zero

(or

nearly

so).

3.

Now

reconnect

the

signal

generator

to

RF

input

#2

and

the

50

Ohm

terminator

to

RF

input

#1.

The

signals

on the

spectrum

analyzer

and

the

oscilloscope

should

be

identical

to

those

seen

in

step

1.

4,

Select

RF

input

#1

without

moving

the

signal

generator

connection.

The

indications

on

the

spectrum

analyzer

and

the

oscilloscope

shoud

again

fall

to

zero.

Page

5-8

R-110

Technical

Manual