PRESIDENT JOHNSON II Service Manual
  1. Manuals
  2. Brands
  3. PRESIDENT Manuals
  4. Radio
  5. JOHNSON II
  6. Service manual

PRESIDENT JOHNSON II Service Manual

Asc multi - am/fm cb transceiver
Hide thumbs Also See for JOHNSON II:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Owner's Manual
JOHNSON II
SERVICE MANUAL

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the JOHNSON II and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for PRESIDENT JOHNSON II

Summary of Contents for PRESIDENT JOHNSON II

  • Page 1 JOHNSON II SERVICE MANUAL...
  • Page 2 - TECNNICAL CHARACTERITICS 1 - GENERAL: - Multiconfiguration (E, d, EU, EC, U, PL) - E ⇒ 40 channels AM/FM 4W (from 26,965Mhz to 27,405Mhz) - d ⇒ 80 channels FM 4W (from 26,565Mhz to 27,405Mhz) 40 channels AM 1W (from 26,965Mhz to 27,405Mhz) - EU ⇒...
  • Page 3 3 - RECEPTION: -Maximum sensitivity at 20dB sinad -0,5µV(-113dBm) AM/FM -Audio frequency response -From 300Hz to 3kHz in AM/FM -Adjacent channel selectivity -Superior to 60dB -Frequency image rejection -Superior to 60dB -Intermodulation response -Superior to 54dB -Maximum audio power -Squelch sensitivity -Threshold 0,2µV(-120dBm)/Tight 1mV(-47dBm) -Current drain -400mA nominal/1000mA maximum...

  • Page 4: Alignment Procedure

    ALIGNMENT PROCEDURE (JOHNSON II) * VCO/PLL PORTION - Alignment procedure - Test points - Frequencies chart * TRANSMITTER - Alignment procedure - Test points * RECEIVER - Alignment procedure - Test points Test equipement required Frequency counter 200 Mhz HF Generator...
  • Page 5 ALIGNMENT VCO/PLL 1 - Alignment procedure(13,2V;configuration”EU,E,d”) STEP CONDITION ADJUSTMENT REMARKS OF ADJUSTMENT FM(EU,E) L302 Connect a voltmeter to TP 301, TX mode adjust L302 to reach 2V±0,2V. Channel 40 FM(EU,E) L301 Connect a voltmeter to TP 301, RX mode adjust L301 to reach 2,3V±0,2V. Channel 40 FM(EU,E) Connect a voltmeter to TP 301,and check:...
  • Page 8 - FREQUENCY LIST (EU,E,EC) Channels Frequencies Frequencies (MHz) (MHz) 26,965 37,660 26,975 37,670 26,985 37,680 27,005 37,700 27,015 37,710 27,025 37,720 27,035 37,730 27,055 37,750 27,065 37,760 27,075 37,770 27,085 37,780 27,105 37,800 27,115 37,810 27,125 37,820 27,135 37,830 27,155 37,850 27,165 37,860...
  • Page 9 - FREQUENCY LIST (PL) Channels Frequencies Frequencies (MHz) (MHz) 26,960 37,655 26,970 37,665 26,980 37,675 27,000 37,695 27,010 37,705 27,020 37,715 27,030 37,725 27,050 37,745 27,060 37,755 27,070 37,765 27,080 37,775 27,100 37,795 27,110 37,805 27,120 37,815 27,130 37,825 27,150 37,845 27,160 37,855...
  • Page 10 - FREQUENCY LIST (U) Channels CEPT Frequencies Frequencies (MHz) (MHz) 26,965 37,660 26,975 37,670 26,985 37,680 27,005 37,700 27,015 37,710 27,025 37,720 27,035 37,730 27,055 37,750 27,065 37,760 27,075 37,770 27,085 37,780 27,105 37,800 27,115 37,810 27,125 37,820 27,135 37,830 27,155 37,850 27,165...
  • Page 11 - FREQUENCY LIST (U) Channels Frequencies Frequencies (MHz) (MHz) 27,60125 38,29625 27,61125 38,30625 27,62125 38,31625 27,63125 38,32625 27,64125 38,33625 27,65125 38,34625 27,66125 38,35625 27,67125 38,36625 27,68125 38,37625 27,69125 38,38625 27,70125 38,39625 27,71125 38,40625 27,72125 38,41625 27,73125 38,42625 27,74125 38,43625 27,75125 38,44625 27,76125 38,45625...
  • Page 12 - FREQUENCY LIST (d) Channels Channels Frequencies Frequencies Frequencies Frequencies (MHz) (MHz) (MHz) (MHz) 26,965 37,660 26,565 37,260 26,975 37,670 26,575 37,270 26,985 37,680 26,585 37,280 27,005 37,70 26,595 37,290 27,015 37,710 26,605 37,300 27,025 37,720 26,615 37,310 27,035 37,730 26,625 37,320 27,055...
  • Page 13 ALIGNMENT TRANSMITTER 1 - Alignment procedure(13,2V;configuration”EU,E”) STEP CONDITION ADJUSTMENT REMARKS OF ADJUSTMENT AM(EU) RT202(LOW) Connect a wattmeter to jack antenna, Channel 20 adjust RT202 to reach 1W on the wattmeter. FM(EU) RT203(HI) Connect a wattmeter to jack antenna, Channel 20 adjust RT203 to reach 4W on the wattmeter.
  • Page 15 ALIGNMENT RECEIVER 1 - Alignment procedure(13,2V;configuration”EU,E,d”) STEP CONDITION ADJUSTMENT REMARKS OF ADJUSTMENT AM(EU,E) L1-L3-L6 Connect HF generator to jack antenna Channel 20 L7-L8-L9-L10 adjusted at ( –107dBm 1KHz 60%), Middle volume connect sinad meter to jack EXT speaker level. and adjust coils for maximum sensitivity( No squelch active ≥...
  • Page 18 JOHNSON II BLOC DIAGRAM...
  • Page 20 JOHNSON II SCHEMATIC DIAGRAM...
  • Page 21 R T 4 0 1...
  • Page 22 JOHNSON II COMPONENT LAYOUT...
  • Page 29 JOHNSON II COMPONENTS LIST...
  • Page 30 5() 12 '(6&5,37,21 63(& % 3&%0$,1 3$%$ % 3&%)5217 3$$$  % 3&%92/80( 3$$$  & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 8) 9 . % & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,&...
  • Page 31 & &&(5$0,& 0/  7$3( 8) 9 . % & &(/(&752/<7,& 8) 9 0 & & &&(5$0,& 0/  7$3( 8) 9 . % & &&(5$0,& 0/  7$3( 8) 9 . % & &&(5$0,& 0/  7$3( 8) 9 . % & &(/(&752/<7,&...
  • Page 32 & &&(5$0,& 0/  7$3( 3) 9 ' &+ & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 8) 9 .
  • Page 33 & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 8) 9 . % & &&(5$0,& 0/  7$3( 8) 9 . % & &&(5$0,& 0/  7$3( 8) 9 .
  • Page 34 & &&(5$0,& 0/  7$3( 8) 9 . % & &&(5$0,& 0/  7$3( 8) 9 . % & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,& 0/  7$3( 3) 9 - &+ & &&(5$0,&...
  • Page 35 ' ',2'( .'6(57.3 ' ',2'(9$5,&$3 +98 758( ' ',2'(9$5,&$3 +98 758( ' ',2'( *' 1*3$ ' ',2'( *' 1*3$ ' ',2'( *' 1*3$ ' ',2'(9$5,&$3 +98 758( ' ',2'(9$5,&$3 +98 758( ' ',2'( *' 1*3$ ' ',2'( *' 1*3$ ' ',2'( *' 1*3$ '...
  • Page 36 )7 ),/7(5&(5$0,& )/ /76+7: ,& ,17(*5$7(' &,5&8,7 1-007( ===% ,& ,1(5*5$7(' &,5&8,7 7.07/* ,& ,17(*5$7(' &,5&8,7 1-007( ===% ,& ,17(*5$7(' &,5&8,7 1-007( ===% ,& ,17(*5$7(' &,5&8,7 1-007( ===% ,& ,17(*5$7(' &,5&8,78& 83'$*.$(8$ ,& ,17(*5$7(' &,5&8,7 ;&&&35 ,& ,17(*5$7(' &,5&8,7 5+5/$$7)$ ,& ,17(*$7(' &,5&8,7 $7&1686/...
  • Page 37 / ,1'8&72502/'(' /= 8+ . / &2,/ /' /5+;; / ,1'8&72502/'(' /= 8+ . / &2,/ /' /5+;; 0& 0,&523+21( 0. (0& 3* 3/8* 3* ,06$+7 4 75$16,6725 '% 6&< 7(/ ) 4 ),(/' ())(&7 75$16,6725 '& 6.%/ 7(/ ) 4 ),(/' ())(&7 75$16,6725 '& 6.%/ 7(/ )
  • Page 38 4 75$16,6725 '% 6&< 7(/ ) 4 75$16,6725 '% 6&< 7(/ ) 4 75$16,6725 '% 6&< 7(/ ) 4 75$16,6725 '% 6&< 7(/ ) 4 75$16,6725 '% 6'7 4 75$16,6725 '% 6&7) 4 75$16,6725 '% 6&7) 4 75$16,6725 '% 6&7) 4 75$16,6725 '% 6&7)
  • Page 39 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 .
  • Page 40 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3 .
  • Page 41 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 .
  • Page 42 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 .
  • Page 43 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 50(7$/ 2;,'(  :6 -...
  • Page 44 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 $;,$/ /($'  . : - 7$3( 5 5&$5%21 $;,$/ /($'  . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 .
  • Page 45 5 5&$5%21 ),;(' &+,3  : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 . : - 7$3( 5 5&$5%21 ),;(' &+,3 .
  • Page 46 57 56(0,),;(' 57 39=$(5 57 56(0,),;(' 57 39=$(5 57 56(0,),;(' 57 39=$(5 57 56(0,),;(' 57 39=$(5 6 6:,7&+7$&7 6: 7& 6 6:,7&+7$&7 6: 7& 6 6:,7&+7$&7 6: 7& 6 6:,7&+7$&7 6: 7& 6 6:,7&+7$&7 6: 7& 6 6:,7&+7$&7 6: 7& 6 6:,7&+7$&7 6: 7&...

Table of Contents