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PRESIDENT WALKER Service Manual
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PRESIDENT WALKER Service Manual

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WALKER
SERVICE MANUAL

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Summary of Contents for PRESIDENT WALKER

  • Page 1 WALKER SERVICE MANUAL...
  • Page 2 -TECNNICAL CHARACTERITICS -E ⇒ 40 channels AM/FM 4W (from 26,965Mhz to 27,405Mhz) -d ⇒ 80 channels FM 4W/AM 1W (from 26,565Mhz to 27,405Mhz) 1-GENERAL: -EU ⇒ 40 channels FM 4W/AM 1W (from 26,965Mhz to 27,405Mhz) -EC ⇒ 40 channels FM 4W (from 26,965Mhz to 27,405Mhz) -Multiconfiguration(E,d,EU,EC,U,PL) -U ⇒...
  • Page 3 -0,5µV(-113dBm) AM/FM -From 300Hz to 3kHz in AM/FM 3-RECEPTION: -Maximum sensitivity at 20dB sinad -Superior to 60dB -Audio frequency response -Superior to 60dB -Adjacent channel selectivity -Superior to 54dB -Frequency image rejection -Intermodulation response -Threshold 0,2µV(-120dBm)/Tight 1mV(-47dBm) -Current drain -Maximum audio power -400mA nominal/1500mA maximum -Squelch sensitivity...

  • Page 4: Alignment Procedure

    ALIGNMENT PROCEDURE (WALKER) - Alignment procedure - Test points - Frequencies chart * VCO/PLL PORTION - Alignment procedure - Test points * TRANSMITTER - Alignment procedure - Test points * RECEIVER Test equipement required Frequency counter 200 Mhz HF Generator...
  • Page 5 ALIGNMENT VCO/PLL 1 - Alignment procedure(13,2V;configuration”EU,E,d”) FM(EU,E) L302 Connect a voltmeter to TP 301, TX mode adjust L302 to reach 2V±0,2V. STEP CONDITION ADJUSTMENT REMARKS OF ADJUSTMENT Channel 40 FM(EU,E) L301 Connect a voltmeter to TP 301, RX mode adjust L301 to reach 2,5V±0,2V. Channel 40 FM(EU,E) Connect a voltmeter to TP 301,and check:...
  • Page 6 TP302...
  • Page 7 L 3 0 1 CT301 L 3 0 2 TP301...
  • Page 8 Channels Frequencies Frequencies (MHz) (MHz) - FREQUENCY LIST (EU,E,EC) 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 Channels Frequencies Frequencies (MHz) (MHz) - FREQUENCY LIST (PL) 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 Channels CEPT Frequencies Frequencies (MHz) (MHz) - FREQUENCY LIST (U) 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 Channels Channels - FREQUENCY LIST (d) 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”) AM(EU) RT202(LOW) Connect a wattmeter to jack antenna, Channel 20 adjust RT202 to reach 1W on the STEP CONDITION ADJUSTMENT REMARKS OF ADJUSTMENT wattmeter. FM(EU) RT203(HI) Connect a wattmeter to jack antenna, Channel 20 adjust RT203 to reach 4W on the wattmeter.
  • Page 14 RT201 RT203 RT202 RT208 RT205...
  • Page 15 ALIGNMENT RECEIVER 1 - Alignment procedure(13,2V;configuration”EU,E,d”) AM(EU,E) L1-L3-L6 Connect HF generator to jack antenna Channel 20 L7-L8-L9-L10 adjusted at ( –107dBm 1KHz 60%), STEP CONDITION ADJUSTMENT REMARKS OF ADJUSTMENT Middle volume connect sinad meter to jack EXT speaker level. and adjust coils for maximum sensitivity( No squelch active ≥...
  • Page 16 RT401...
  • Page 17 L 11 L 1 0...
  • Page 18 WALKER BLOC DIAGRAM...
  • Page 19 B l ock  D i agram...

  • Page 20: Schematic Diagram

    WALKER SCHEMATIC DIAGRAM...

  • Page 22: Component Layout

    WALKER COMPONENT LAYOUT...

  • Page 41: Components List

    COMPONENTS LIST...
  • Page 42 1/19 WALKER : Bill of Material ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS C:ELECTROLYTIC 100UF 10V M C-156 C011 AT373ZHBAE BCAZ111016Z C:ELECTROLYTIC 100UF 10V M C-156 C056 AT373ZHBAE BCAZ111016Z C:ELECTROLYTIC 100UF 10V M C-156 C348 AT373ZHBAE BCAZ111016Z C:ELECTROLYTIC 220UF 10V M C-156 C080 AT373ZHBAE BCAZ112216Z...
  • Page 43 2/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS C:CERAMIC M/L (1608) TAPE 0.001UF 50V K B C096 AT373ZHBAE BCML811025G C:CERAMIC M/L (1608) TAPE 0.001UF 50V K B C097 AT373ZHBAE BCML811025G C:CERAMIC M/L (1608) TAPE 0.001UF 50V K B C101 AT373ZHBAE BCML811025G C:CERAMIC M/L (1608) TAPE 0.001UF 50V K B C102...
  • Page 44 3/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS C:CERAMIC M/L (1608) TAPE 0.01UF 50V K B C270 AT373ZHBAE BCML811035G C:CERAMIC M/L (1608) TAPE 0.01UF 50V K B C272 AT373ZHBAE BCML811035G C:CERAMIC M/L (1608) TAPE 0.01UF 50V K B C325 AT373ZHBAE BCML811035G C:CERAMIC M/L (1608) TAPE 0.01UF 50V K B C326...
  • Page 45 4/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS C:CERAMIC M/L (1608) TAPE 0.1UF 50V K B C241 AT373ZHBAE BCML811045G C:CERAMIC M/L (1608) TAPE 0.1UF 50V K B C248 AT373ZHBAE BCML811045G C:CERAMIC M/L (1608) TAPE 0.1UF 50V K B C254 AT373ZHBAE BCML811045G C:CERAMIC M/L (1608) TAPE 0.1UF 50V K B C266...
  • Page 46 5/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS C:CERAMIC M/L (1608) TAPE 0.056UF 50V K B C265 AT373ZHBAE BCML815635G C:CERAMIC M/L (1608) TAPE 10PF 50V D CH C008 AT373ZHBAE BCMM811002G C:CERAMIC M/L (1608) TAPE 10PF 50V D CH C100 AT373ZHBAE BCMM811002G C:CERAMIC M/L (1608) TAPE 10PF 50V D CH C205...
  • Page 47 6/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS C:CERAMIC M/L (1608) TAPE 56PF 50V J CH C015 AT373ZHBAE BCMM815604G C:CERAMIC M/L (1608) TAPE 56PF 50V J CH C217 AT373ZHBAE BCMM815604G C:CERAMIC M/L (1608) TAPE 560PF 50V J CH C035 AT373ZHBAE BCMM815614G C: CERAMIC M/L (1608) TAPE 8PF 50V D CH C335...
  • Page 48 7/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS DIODE GD 1N4148-GP-A2 D022 AT373ZHBAE BDAG1356003 DIODE GD 1N4148-GP-A2 D201 AT373ZHBAE BDAG1356003 DIODE GD 1N4148-GP-A2 D204 AT373ZHBAE BDAG1356003 DIODE GD 1N4148-GP-A2 D205 AT373ZHBAE BDAG1356003 DIODE GD 1N4148-GP-A2 D207 AT373ZHBAE BDAG1356003 DIODE GD 1N4148-GP-A2 D208 AT373ZHBAE BDAG1356003 DIODE...
  • Page 49 8/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS TRANSISTOR DB-764 2SC3052-T112-1F Q205 AT373ZHBAE BDBL3052730 TRANSISTOR DB-764 2SC3052-T112-1F Q210 AT373ZHBAE BDBL3052730 TRANSISTOR DB-764 2SC3052-T112-1F Q211 AT373ZHBAE BDBL3052730 TRANSISTOR DB-764 2SC3052-T112-1F Q214 AT373ZHBAE BDBL3052730 TRANSISTOR DB-764 2SC3052-T112-1F Q301 AT373ZHBAE BDBL3052730 TRANSISTOR DB-764 2SC3052-T112-1F Q309 AT373ZHBAE BDBL3052730 TRANSISTOR...
  • Page 50 9/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS COIL LB-1129 7PL4A151N L009 AT373ZHBAE BLBY1129001 COIL LB-1131 KS2484F L001 AT373ZHBAE BLBY1131001 COIL LB-1179 7MK4A033N L010 AT373ZHBAE BLBY1179001 COIL LD-087 BF04-3*5*1 L012 AT373ZHBAE BLDY0087001 COIL LD-087 BF04-3*5*1 L013 AT373ZHBAE BLDY0087001 COIL LD-087 BF04-3*5*1 L014 AT373ZHBAE BLDY0087001 COIL...
  • Page 51 10/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON FIXED CHIP 100 1/16W J TAPE R085 AT373ZHBAE BRFC161014G R:CARBON FIXED CHIP 100 1/16W J TAPE R086 AT373ZHBAE BRFC161014G R:CARBON FIXED CHIP 100 1/16W J TAPE R118 AT373ZHBAE BRFC161014G R:CARBON FIXED CHIP 100 1/16W J TAPE R230 AT373ZHBAE BRFC161014G...
  • Page 52 11/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON FIXED CHIP 10K 1/16W J TAPE R008 AT373ZHBAE BRFC161034G R:CARBON FIXED CHIP 10K 1/16W J TAPE R014 AT373ZHBAE BRFC161034G R:CARBON FIXED CHIP 10K 1/16W J TAPE R017 AT373ZHBAE BRFC161034G R:CARBON FIXED CHIP 10K 1/16W J TAPE R018 AT373ZHBAE BRFC161034G...
  • Page 53 12/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON FIXED CHIP 10K 1/16W J TAPE R339 AT373ZHBAE BRFC161034G R:CARBON FIXED CHIP 10K 1/16W J TAPE R351 AT373ZHBAE BRFC161034G R:CARBON FIXED CHIP 10K 1/16W J TAPE R355 AT373ZHBAE BRFC161034G R:CARBON FIXED CHIP 10K 1/16W J TAPE R356 AT373ZHBAE BRFC161034G...
  • Page 54 13/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON FIXED CHIP 1.5K 1/16W J TAPE R294 AT373ZHBAE BRFC161524G R:CARBON FIXED CHIP 1.5K 1/16W J TAPE R317 AT373ZHBAE BRFC161524G R:CARBON FIXED CHIP 15K 1/16W J TAPE R028 AT373ZHBAE BRFC161534G R:CARBON FIXED CHIP 15K 1/16W J TAPE R040 AT373ZHBAE BRFC161534G...
  • Page 55 14/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON FIXED CHIP 270 1/16W J TAPE R022 AT373ZHBAE BRFC162714G R:CARBON FIXED CHIP 270 1/16W J TAPE R024 AT373ZHBAE BRFC162714G R:CARBON FIXED CHIP 270 1/16W J TAPE R211 AT373ZHBAE BRFC162714G R:CARBON FIXED CHIP 270 1/16W J TAPE R254 AT373ZHBAE BRFC162714G...
  • Page 56 15/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON FIXED CHIP 33K 1/16W J TAPE R258 AT373ZHBAE BRFC163334G R:CARBON FIXED CHIP 33K 1/16W J TAPE R259 AT373ZHBAE BRFC163334G R:CARBON FIXED CHIP 3.3 1/16W J TAPE R045 AT373ZHBAE BRFC163394G R:CARBON FIXED CHIP 3.3 1/16W J TAPE R206 AT373ZHBAE BRFC163394G...
  • Page 57 16/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON FIXED CHIP 560 1/16W J TAPE R271 AT373ZHBAE BRFC165614G R:CARBON FIXED CHIP 560 1/16W J TAPE R374 AT373ZHBAE BRFC165614G R:CARBON FIXED CHIP 560 1/16W J TAPE R559 AT373ZHBDE BRFC165614G R:CARBON FIXED CHIP 5.6K 1/16W J TAPE R071 AT373ZHBAE BRFC165624G...
  • Page 58 17/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS R:CARBON AXIAL LEAD (26) 100K 1/6W J TAPE R002 AT373ZHBAE BRPA611044Z R:METAL OXIDE 100 1WS J R295 AT373ZHBAE BRSJ001014Z R:METAL OXIDE 220 1WS J R212 AT373ZHBAE BRSJ002214Z RESISTOR:METAL OXIDE 56 1WS J R308 AT373ZHBAE BRSJ005604Z R:METAL OXIDE...
  • Page 59 18/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS WIRE W-004 UL 1571 #26 3- 35- 3 WHT W003 AT373ZHBAW CUPJ003511G WIRE W-004 UL 1571 #26 3- 40- 3 WHT W005 AT373ZHBAW CUPJ004011G WIRE W-004 UL 1571 #26 3- 40- 3 BLK W004 AT373ZHBAW CUPK004011G PANEL:FRONT...
  • Page 60 19/19 ASSY CODE PARTS CODE DESCRIPTION SPEC REF NO QTY REMARKS SCREW:BIND HD + M3X10 NI CHASSIS-HEATSINK-TR AT373ZHBYM SSCW193010N SCREW:TAPPING ROUND HD + D3.5X8 NI ACC MIC HANGER AT373ZHXYM SSCW293508N SCREW:TAPPING ROUND HD + D5X10 NI ACC BRACKET AT373ZHXYM SSCW295010N SCREW:TAPTIGHT BIND HD + M3X6 NI DC CONNECTOR AT373ZHBYM SSCW343006N...