Realistic PRO-2020 Manuel utilisateur

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Service

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PRO-2020

PLL

SVNTHESIZED

VHF/UHF

AM/FM

RECEIVER

)Catalog Number:20-112

Manual provided by G.E.Taylor, scanned by L.P. Glaister VE71T

CUSTOM

MANUFACTURED

FOR

RAD

SHACK

DIVISION

TANDY

CORPORATION

GENERAL OPERATION OUTLINE

Press IPROGRAM I.

Advan ces t o ne xt cha nne l,

kev-in the Ireq ue ncy and

press

[]EI];

repeat to

memorizedesir

edfrequenc

ies,

one by one.

Press !PRIORITYI ; il

SQUELCH is ON, starts pri-

oritv functi on.

1I SQUELCH is OFF, set

to th

eprio

rit

ychann

el.

DISASSEMBLY DIAGRAM

Step 1:

Step 2:

Step 3:

Step 4:

Removetwobracketscrews

@andthebracket

W~ove

four screws

two from each side of the

Cabinet.

Removetwoscrews

@frombac

kotcab

ineto

Open

thecab

inet. Use care not to damage leads of

speakerinstalledonthecab

inet.

ALlGNMENT AND TEST

POINT

POSITIONS

~T10

@j~

TP-106

WJ0

T1rAö

'·

@JT C-l05

I@ TC-l07

T~O

~02

@) TC-lrAö

ALlGNMENT PREPARATION

Testequ

ipmentrequired

1. Oscilloscope (0 - 500 kHz, 0 - 50 MHz )

2. AC VTVM

3. DC VTVM

4. FrequencyCounter (SOMHz)

5.8ohmdummyload

S. Slow Sweep Generator with variabie marker 110.7 MHz)

7. VHF Sweep Generator with variabie marker

(30 - 50 MHz, *6

88 MHz, 108

-17

4 MHz)

8. UHF Sweep Generator with variabie marker

(41

512 MHzl

9. FM SignaI Generator (30 - 50 MHz, *S8 - 88 MHz,

138

-1

74 MHz, 410 - 512 MHz)

10. AM Signal Generator (108 - 136 MHz)

NOTE1

:Use non-metsttic tuning tools.

The test eauloment and Receiver should be warmed up at least 10 minutes before proceeding with alignment.

Input signal from the Generator should be kept as low as possible and still obtain usabie output.

NOTE 2: A 9·volt betterv is required to hold the memory when AC is disconnected . Always be sure the unit is loaded with

afresh 9·volt betterv or the pre-programmed channels will be last rand will have to be re-proçremmed}.

.•OTE 3: For servicing VHF Mid band of European/A ustralian models, see Appendi x on pages 41and 42.

(

REFERENCE FREQUENCY osc

ALlGNMENT

Step 1: Connect Frequency

Counter

to TPl and ground . Conneet the ground first to prevent IC-8 Iatch·up.

Step 2: Adjust TC-l sa tha t the frequency is 6

.40000

MHz ±10 Hz.

NOTEl:

If 6.4 MHz faits to ascii/a te, it may due to /C

·8/atch·up

Unp/ug the

power

connector

momen tary to rum

power

supp/v

completety

off.

IF SECTION

ALlGNMENT

Step 1: Connect

instrumentsas

shownbe

low.

Step 2: Adjust

Tl05

for maximum

output

sa that the 455 kHz marker is in the center of the disc

riminator

curve and far

bestl inear

itya

shownabov

During Alignment, maintain Sweep Generator

output

at the lawest level possible to prevent averloading.

VCO ALlGNMENT

VHF LO BAND

Step 1: Cannect a DC VTVM to TP-l0 4 and graun d.

Step 2: ProgramCH1

,2and3asfalla

ws:

CHl (30 MHz), CH2 (40 MHz), CH3 (50 MHz).

Step 3: Select Channel 3 (50 MHz) and adjust

TC-l0l

far 9

.0Van

the DC VTVM.

Step 4: Select Channel 1 (30 MHz) and adjust

Tl03

far 1.0V o n the DC VTVM.

Step 5: Repeat steps 3 and 4 unt il na improvement is ob served. The DC VTVM shoul d show as below .

30 MHz Voltage at TP104 1.0V

40 MHz Voltage at TP104 3.4 ±0.3V

50 MHz Voltage at TP104 9.0V

VHF Hl BAND AND AIRCRAFT

Step 1: Connect a DC VTVM to TPl 04 and ground.

Step 2: Program CH1,

2,3,4

,5and6asfollows

CHl (108 MHz), CH2 (120 MHz), CH3 (136 MHz), CH4 (138 MHz), CH5 (160 MHz), CH6 (174 MHz).

Step 3: Select Channel 6 (174 MHz) and adjust TC102 for 8.0V on the DC VTVM.

Step 4: Select Channel 1 (108 MHz) and adjust L107 for 1.0V on the DC VTVM.

Step 5: Repeat step s 3 and 4 unt il no impr ovemen t is o bserved , The DC VTVM sha uld sho w as below .

108 MHz Voltage at

Tp·l0

4 1.0V

120 MHz Volta ge at TP

·l04

2.1 ±0.3V

136 MHz Voltage at TP-l04 3.6 ±0.3V

138 MHz Voltage at TP

·l0

4 1.8 ± 0.3V

160 MHz Voltage at TP-l04 3.9 ±0.3V

174 MHz Voltage at TP

.l04

8.0V

UHF BAND

Step 1: Connect a DC VTVM to TP-104 and ground .

Step 2: Program

CH1,2and3

asfollows

Chl (410 MHz), CH2 (430 MHz), CH3 (512 MHz!.

Step 3: Select Channel 3 (512 MHz) and adjust TC·106 for 9

.0Von

the DC VTVM.

Step 4: Select Channel 1 (410 MHz) and adjust L111 for 1.OVon the DC VTVM.

Step 5: Repeat steps 3 and 4 unt il no improvement is observed. The DC VTVM should show as below.

410 MHz Voltage at

TP·l04

1.0V

430 MHz Voltage at TP·104

1.8±

0.3V

512 MHz Voltage at TP·104 9.0V

RF AMP ALlGNMENT

VHF LO BAND

Step 1:

Connectinstrumentsasshownbelow.

Step 2: Program 30 MHz (CH1). 40 MHz (CH2) and 50 MHz (CH31.

Step 3: Select Channel 2 140 MHz) and adjust

nOl

and

Tl02

for maximum RF waveform . { .

Step 4: Check Channels 1 - 3 for the maximum RF waveform. A slight deviation (as shown below) is acceptab le.

/\\71\

I ,

VHF Hl AND

AIRCRAFT

Step 1: Connect instruments as shown below .

Step 2: Program 108 MHz (CH1), 120 MHz (CH2). 136 MHz (CH3). 138 MHz (CH4l. 160 MHz (CH5) and 174 MHz

(CH61.

Step 3:

SelectChannell

(108MHz)

and adjust

Ll04and

Ll06for

maximum

RF waveform.

Step 4: Select Channel 5 (160 MHz) and adjust L103 and L105 for maximum RF waveform .

Step 5: Repeat steps 3 and 4 to obtain the max imum RF waveform f or each channel.

Step 6: Check Channels 1 - 6 for the

maximum

RF waveform at each frequency marker. A slight dev

iation

(as shown

below) isacceptable.

UHF BAND

Step 1: Conneet instr ument s as shown below .

Step 2: Program 410 MH z (CH1). 430 MHz (CH2) and 512 MH z (CH31.

Step 3: Select Channel 2 (430 MHz) and adjust TC

·l03

TC-l04

. and TC-t05 tor maximum RF waveform .

Step 4: Select Channel 3

(5t2

MHz) and adjust

TC·tOl

for maximu m RF waveform.

Step 5: Check Cannels 1 - 3 for the maximum RF waveform at each freq uency marker. A slight dev

iation

(asshown

below is acceptable ,

430

FREQ(MHzi

OVERALL ALlGNMENT AND SENSITIVITY MEASUREMENT

Step 1: Con neet Signal Gene

rator

(SSG) to

ANTenna

jack and AC VTVM to EXT. SPKR Jack .

Step 2: Turn SOUELCH fully counterclockwise. Set for recept ion of the channels noted in the following chart.

SettheSSG

tothe

center

ofeach

band.

CH BAND FREO .

1 VHF LO (MlD) 40 MHz (78 MHz)

2VHF Hl

160MHz

3UHF

512MHz

AIRCRAFT

120MHz

Step 3: Set the Signal

Generato

frequency

to 512 MHz (channel 3). Readjust TC

-l07

for maximum sensitivitv,

Step 4 : Set the Signal

Generator

frequency to 120 MHz

(channeI41.

Adjust

Tl04,

Tl06

and

Tl07

for

maximum

sensitivity.

Step 5: For each f

requenc

/channel,

set Signa I

Generator

to each frequency (FM: 3 kHz deviation, AM: 60% rnodu -

lation) . Set VOLUME

control

for 0 dB (0.775 V) reading on the VTVM.

Step 6: Turn off the

modulation

and measure the (S +Nl/N ratio.

ZEROMATIC FUNCTION AND HOW Ta CHECK IT

eromatic

functions

when

OUTPUT

1 is in

"H"

level.

adjust

el vo ltage, receive signal in Manual mode , and set T105 to get half sup ply voltage (IC101, 4 pin). It is con -

venienttousethe

National

WeatherServ

iceSignalfortheadjua

tment

In the event

Zeromatic

does not

function

right, refer to " REFERENCE FREQUENCY asc

ALlGNMENT"

and check

6.4 MHz, and adju

stT105aga

in.

RESET

TIMING

(lC-1)

OV~

5V I

Ir--

OV~

I I

f.-;.-2

----t

Figure1

NaTE

Pin31 of IC·'

isthe

RESETterminalwhich

functionsatLlevel.

ItrevertstoH

level

2msafterPin42VDD.

CPUCLOCK OSCILLATION WAVEFORM (JC-1)

\fW\/\fvi

I I

DV I I

1 I

2 .5~s

Figure2

IC-3 INPUT/OUTPUT WAVEFORM

NaTE :

This is the basic waveform of CPU (lC-1).

Ceramic

ResonatorIX

-2)

generate

s400

kl-iz for

about

ZBus

:~=~===========lrrnnJ

:IL

ov I : :

Figure3

NaTE:

Waveform at Pin No. 5 is CPU ncn

interruptsignal.Musthaveabovewaveform

ortheCPU

program

malfunctions

IC-4 INPUT/OUTPUT TIME CHART (150 MHz displayed,inProgramMode)

14 OV

5V {

13 OV

10 ov

I 1 II

5V I1

lLJl

9ov 11 I

I I I

I 1

1-1

10.12 ms II

- I

INPUT 4

Ce manuel convient aux modèles suivants

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