PRESIDENT JAMES Manuel utilisateur

M e a s a w

MAINTENANCE MANUAL

У ///////////Л COMMERCIAL CHARACTERISTICS 777/У ////////Л

GENERAL:

Frequency Band:

Nu ber of channels:

Différence between channels:

E ission dass:

Power supply:

Te pérature argin:

Antenna i pédance:

EMITTER:

26,965 MHz to 27,405 MHz

10 KHz

A3E (AM),F3E (FM)

13,2 V (10,8 Vto 15,6 V)

-10° C to + 55° C

50 Oh s

Frequency différence:

Output power:

Microphone i pédance:

Output power in adjacent channel:

less than +/- 600 Hz + 0,002 %

4 W peak

500 Oh s

less than 20 icrowatts.

RECEIVER:

First I.F.:

Second I.F.:

I pédance of incorporated icrophone:

L.F. output power:

Sensitivity:

10,695 MHz

455 KHz

8 Oh s

better than 12 dB/ icrovolt

У/Ш Ш //А GENERAL USE м ш /ш /л

Phase locked-loop Circuit (PLL)

The PLL circuit consists essentially of:

- the voltage controlled oscillator (VCO) by the transistors Q403, Q402 and Q401

- the charge pu p circuit Q405, Q406

- the integrated circuit IC401 which contains the reference frequency, the progra able generated fre-

quency divider and the phase co parator.

The information necessary for the working of the integrated circuit is sent in sériés by the micro Controller

IC701.

The output signal of this oscillator is the frequency 38,100 MHz for channel 40 in é ission ode.

The frequency différence between the two odes (réception and é ission) is obtained by switching the coil

L403.

EMITTER:

In AM the low frequency signal is prea plified by IC605, then a plified by IC201 and enters into the

odulation transfor er T201. This a plified low frequency signal is applied to the high frequency power

supply stage Q502, Q501 by their collecter so that the high frequency is odulated.

In FM the low frequency signal is li ited and filternd by the stage IC606, D604 is applied to the diode Varicap

D406 via the adjustable résistance VR400.

The signal delivered by the frequency odulated VCO by this low frequency signal, will be applied to the

power supply stage which consists of the transistors Q201, Q502 et Q501.

In AM/FM, the a plified signal will be filtered before being sent to the antenna socket JK425.

RECEIVER:

The VCO signal is used as a first local oscillator. The ixing with the received frequency is carried out by

the stage L7, D7, L8 which gives a first I.F. of 10,695 MHz. The signal reference of the PLL at 10,240 MHz

is used as a second local oscillator by Q12 to obtain a second I.F. at 455 KHz.

In AM, the latter will be applied to the AM détecter stage, co posed of D12, and co anded by Q17.

In FM, the latter will be applied to the FM détecter stage, co posed of the integrated circuit IC1 (discri inator)

and its loading coil L21.

In AM/FM, the low frequency signal is then applied to the transistor Q21, low frequency prea plifier and then

to the low frequency a plifier IC 407 via the volu e Potentio eter.

У///////////Л ALIGNEMENT OF THE SYNTHESISER

1. Aligne ent Procedure

0Channel 20, C band

Réception in AM L404 Frequency eter on pin 1 of

the IC 401. Adjust L404 so as

to obtain 10.240 MHz ± 10 Hz

1Channel 20, C band

Réception in AM L402

Connect the continued

Volt eter to the point TP1

R423. Adjust L402 so as to

obtain 2,8 V ±0,1

2* Channel 40, F band

Channel 1, A band

Check on TP1-R423 that: -

4,3 V ± 0,1 channel 40 F band

1,8 V ± 0,1 channel 1 A band

3Channel 20, C band

é ission in AM

L403

TX3V

Connect the TP1 Volt eter on

R423. Adjust L403 so as to

obtain 2,7 V ±0,1.

4* Channel 40, F band

Channel 1, A band

TX 5,2V

TX 1,9 V

Check on TP1-R423 that:

4,8 V ± 0,1 channel 40 F band

1,5 V ± 0,1 channel 1 A band

5Channel 20, C band

Réception in AM L401 Connect the frequency eter

to Pin 8 of the IC 401 so as to

obtain 37.900 MHz.

This check to be established on 'Export Model' equip ent only.

У///Ш У///А ALIGNEMENT OF THE RECEIVER ш / ш м / л

1Channel 20, band С

AM odulated 1 KHz 60%

Level 1pV = -107dB

L2.L11.L12, L13, L16.L17,

L18

Connect the HF Volt eter or

an oscilloscope to the loud

speaker. Readjust the coils in

the given order so as to obtaln

a axi u reading.

2Sa e as 1 except FM L21 Readjust to obtain a axi u

reading.

3Sa e as 1 AM

Level 100 pV

VR2 Adjust so as to bring the LED

to 9 in the display, position

RF.

4Sa e as 3 VR3 Connect an externa! V.U.

eter. Adjust VR3 so as to

obtain S.9. on the V.U- eter.

Channel 20 AM

Maxi u squelch

Level 1000 pV

Modulated 1 KHz

VR1 Adjust VR1 so as to readjust

the low frequency signais.

У///////////Л ALIGNEMENT OF THE EMITTER У////////////А

* Channel 20 VR406 Adjust VR 406 so as to obtain

1AM é ission 4 W on the Watt eter (French

Without odulation odel), 12 W (Export odel).

Channel 20 Adjust VR401 so that the

2AM é ission VR401 V.U.- eter indicator is at S9,

Without odulation position RR

Channel 20

AM é ission VR201 Adjust VR201 to obtain 90%

Modulation 1 KHz odulation.

Level 10 V

Adjust VR405 to get a watt

4* Sa e as 3 except FM VR405 eter reading of 4 W (French

odel), 15 W (Export odel).

Channel 20 AM

cFM é ission Adjust VR400 so as to obtain

Modulation 1 KHz an FM excursion of 1,5.

Level 10 V

Measure ent for 'Export Model' equip ent only

B001

PA - 352

ВОГТОМ VIEW

2/2

JP13(10 )

IRRAX TUBE

00.7x8

SHIELD PLATE

M4 - 93846

\ PATTERN W/ Л/У Л/yi

SCRAPE ANTENNA SCRAPE

JACK PATTERN

VINYL TUBE

0 2.0 x 25 PATTERN W/

SCRAPE

JP17 (13)

IRRAX TUBE

j 0 0.7 x 12 r

SWR PCB

JP18 (13)

IRRAX TUBE

0 07 x 12

C495

0.001/YD

SHIELD P UTE

M4-93847

-----------

CHASSIS

« : SOLDERING

D431

IN4148

Vinyl tube

0 2.0

12 long

1M1/6W

VINYL TUBE

02 x 18

SHIELD PUTE

M4- 93848

C471

V 4.7UF50

Q50/-502

E2ZZZ2 LIST OF SPARE PARTS FOR JAMES

REF. D ESIG N A TIO N QTY/M O D

BC184 COIL LZ-041 0.47 pH 1

BC185 COIL LZ-0670.068 \iH (CMS) 1

BR014 COIL LB-119 1

BR018 COIL LB-224 2

BR022 COIL LB-233 1

BR029 COIL LB-341 1

BR031 COIL LB-343 1

BR201 COIL LB-313 1

BR206 COIL LB-948 2

BR212 COIL LB-955 1

BR213 COIL LB-956 1

BR214 COIL LB-957 1

BR215 COIL LD-193 2

BR216 COIL LD-201 3

BR220 COIL LC-240 1

BT025 COIL LB-336 1

BT027 TRANSFORMER TF-453 MODUL 1

CF018 CAPA 0.047F 5.5 V 1

DC070 DIODE 1 SS 226 (CMS) 1

DC071 DIODE DAN 235 K (CMS) 1

DC072 DIODE KV 1430 (CMS) 1

DC073 DIODE RLS135 (CMS) 2

DC074 DIODE ND 434 G 1

DC076 DIODE MA 716 (CMS) 2

DV033 DIODE HSM 88 AS (CMS) 3

DV034 DIODE HSM 88 WA (CMS) 2

HM037 MICROPHONE MK-444 1

LIST OF SPARE PARTS FOR JAMES

REF. DESIGNATION QTY/MOD

HP028 LOUD SPEAKER SP-238 1

IL075 INTEGRATED CIRCUIT M 51951 1

IL076 INTEGRATED CIRCUIT TC 4S66F CMS 2

IL077 INTEGRATED CIRCUIT TL 750M08C 1

IL078 INTEGRATED CIRCUIT M 54995F CMS 2

IP022 INTEGRATED CIRCUIT MB 3735 1

IR027 INTEGRATED CIRCUIT 78L05 1

IR125 INTEGRATED CIRCUIT LA 4485 1

IR126 INTEGRATED CIRCUIT MN 3207 1

IR127 INTEGRATED CIRCUIT MN 3102 1

IS048 INTEGRATED CIRCUIT PLL 2002 A1 1

IS054 INTEGRATED CIRCUIT UC 1520 1

IS055 INTEGRATED CIRCUIT 93C46T CMS 1

IY439 PCB F/PANEL. FOR JAMES 1

IY441 PCB ECHO MODUL JAMES 1

IY443 PCB VOLUME BUTTON JAMES 1

IY445 PCB MIKĘ FOR JAMES 1

JX003 JACK JK-068 (JK261/JK370/JK426) 1

JX077 JACK JK-423 EXT METER 1

JX080 JACK JK-729 MIC 6 BROCHES CHASSIS 1

ОАОЗО DISPLAY CRIS. LIQ DL-071 1

0X028 DIODE CL 140YG (CMS) 12

0X029 DIODE CL140D (CMS) 12

PF052 FILTER FL-566 1

PQ060 QUARTZ 4.190 M FK-007 1

QX341 CRADLE SCREW PRESIDENT S/MODEL 2

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