Service Manual President Washington MB8719 (ENG)
Contents
1. Input of frequency counter TP10 Input of frequency counter TPS Input of frequency counter 163 Input of frequency counter to TP3 Disconnect TP and TP8 Ch 19 AM Ch 19 AM Clarifier Midrange Ch 40 AM Ch 19 USB Ch 19 USB Clarifier Midrange Ch 19 LSB Clarifier Midrange Ch 19 AM Clarifier Midrange 19 XMT LSB 1 USB 19 USB 19 USB 19 XMT AM Check for 10 240MHz Adjust for maximum RF Adjust for 5 00 volts Adjust for maximum RF Adjust for 34 9875MHz 20Hz Check all channels Tsee Truth Chart for correct frequencies Adjust for 37 9825Miz Check ali channels correct frequencies Adjust for 34 9850MHz 20Hz Check all channels See Truth Chart for correct frequencies Adjust for 34 9825MHz 20Hz Check for 1 450Miz Check all channels See Truth Chart for correct frequencies Adjust for 7 8025MHz 5Hz or 0Hz Adjust for 7 797SMHz 0Hz or SHz Adjust for 7 8000MHz SHz RECEIVER ALIGNMENT Connect an AC VTVM or AF wattmeter across speaker voice coil Adjust volume control to obtain a suitable indication Set generator output low enough to prevent AGC limiting Mode AM RF Gain Max quelch MINIMUM Clarifier Midrange Output of signal generator thru 2 Adjust for maximm output OluF to TP13 TRIO Collector 7 8MHz 1000Hz 30 modulation Output of signal generator thru Adjust for maximum output OluF to antenna input L8 L92. a ET rM 34v f AV ems 63 33K 1 Bo NEU Drm m Ga L B couro az PK ux MRE vr e Qi Bila e I e Lev O jm gt Seng E ED du aur l t i da E ew 7 y o SS i e nv 1 e ize ST CECI HO 3 aov B LBV 8 5 a 7 z 9 2 29c 1675 9 ENS B ua Gd osc avisa cnt ce Conny ene vs cci a a a UOT ORR ALIGNMENT INSTRUCTIONS CAUTION Use isolation transformer or observe polarity when connecting test equipment Maintain line voltage at 120V AC Allow a 15 minute warm up period Adjustments made with 13 8 volt DC at TPIS Connect low sides of test equipment to ground unless specified otherwise Connect 50 ohm dummy load or antenna before keying transmitter Connect microphone Suggested Alignment Tools GC ELECTRONICS Li thru L10 L13 L14 L17 thru L20 L26 thru L29 9440 L36 L39 ee cence caer eee esses 8728 8728A 9304 CTL CT2 CTS 5000 8276 SYNTHESIZER ALIGNMENT TEST EQUIPMENT Input of frequency counter to TP12 IC2 Pin 8 Input of oscilloscope to TP16 L18 Secondary Input of DC meter to TP9 Input of oscilloscope to TP Input of frequency counter to Input of frequency counter TPL Input of frequency counter TPI Input of frequency counter ra
3. 1001002 Washington 40 Channel SSB Base escape y e pr ree A EO KE D NE AVE i i EE will Service manual thanks Homer PRESENT Engineered to be the very best EEE ABATE IS CF wns 3 Bc tI oN do s e ORE eeno ee mon To TRIO MAKER Circull race 41 181716 1514 13121110 Ic Top view ECB TR19 TR23 TR24 Botiom view fo ilo XMT MIXER Circuit race 41 ee t Circuitry not used in some versions Circuitry used in some versions 9 See parts list E Nominal value Ground mm Chassis WV Common tie point Signal path lt F Voltage path A PHOTOFACT STANDARD NOTATION SCHEMATIC WITH dT TRIER Howard W Sams amp Co Inc 1978 RN E dl Ce What whe Terminal G uides Emu em 12345 12345678910 e Fran view Prnt vini 51418 1214 d Or wh sErey win 0r wn zi Gra ce arte 12345678 ami Bottom view Measurements made in Channel 1 with switching as shown unless noted Nem numbers in rectangie appear in the alignment adjustment instructions Supply voltage maintained as shown at input Voltages measured with digital meter no signal Controls adjusted for normal operation Arrow at control indicates direction of advance Terminal identification may not be found on unit Resistors cre 1 2W or less 5 unless noted Valve in used in some versions See teuth chart 8 04 5 SE
4. L10 If necessary readjust L3 27 185MHz 1000Hr 30 modulation and L4 for maximus Output of signal generator thru Li L2 Set generator output for OluF to antenna input Ee 10db signal to noise plus 27 185MHz 1000Hz 30 modulation noise ratio of receiver Input of oscilloscope to TP14 Inject a 100pps luSec pulse TRO Emitter width signal at antenna input Switch Noise Blanker on and adjust for meximm amplitude pulses RECEIVER ADJUSTMENTS Connect an AC VTVM or AF wattmeter across speaker voice coil Adjust volume contro to obtain a suitable indication Mode AM RF Gain Maximum Squelch MINIMUM Clarifier Midrange NB off H Ch 19 Output of signal generator thru luF to antenna input Squelch Maximum 27 18SMHz 1000Hz 30 modulation Output 1000uV ADJUST VR2 SQUELCH RANGE Adjust so that squelch just breaks Output of signal generator thru OluF to antenna input 27 85MHz 1000Hz 30 modulation Output 1064 Ch 19 S RF MOD S RF SIG METER Adjust for 9 pn sig scale of meter RECEIVER ALIGNMENT Connect an AC VTVM or AF wattmeter across speaker voice Adjust volume control to obtain a suitable indication Set generator output low enough to prevent AGC limiting Mode USB RF Gain Maximum Squelch MINIMUM Clarifier Midrange NB Off SSB Output of signal generator thru OluF to TP13 TRIO Collector 7 8025MHz no modulatio
5. T STANDARD NOTATION SCHEMATIC wis Howord W Sams amp Co Inc 1978 opes i fe Um ENSE cp ES EE OIE RE gems nieto atlantic eni ge te re E 9 BCOM Rm IST AM 7 8MHz ene rio 7o dat T fv Voltages for TR thru TRA St Nos Bani om Lavisse WEE gi 4 RIP TR ORE 3 ris ersten ie E SE AG ED TRT RIA ME Gcr n ae 77 SCH Cho vit ant 9 COM e D EM Vu i fri ist ame REEL A in ascia Bcioni RI 210 te amp a RO ir AMP fi an ame AM 7 33 v SSB JF AGC Range Mv ai 10v F 6 25K198L 94 9 2609450 9 mam AGC 10K RB sonic Ria ue vio ark RM Yet 1 SQUELCH wk GE mm Bik S Vater E wpe Auf Cen OO ets sQquelch ILL RANGE 613 15 5RR ini 10K o e ROY TONY PA ASV uv her KEYED M a ce mm 223v dpr LS 7 E AV tv qu a j a V9 ar nyt zk y 2 1 0 20 V XAT AM ge T vise 13 76 anvise Cap LISV PA w Se GE SWITCH Kr AC OV MIC KEYED i pre e iio a 3 6 SC cat Ab BK A Db nur 36 v MOD aim dev Ce i wm Cd n Vial px 2 8 Bov i d mv 8 At EISEN geg a over e esi ET She Deis 3 i i F Lev 5 LAY mg i 8 00 v wt 4 HAM li d nis Ge VR BHO oI LOY wm oris CH y faim vie Gei Ant tava 3 09 v MT From ICI VCOMINER Circ
6. modulation meter Insert a 0 150mA DC current meter Ch 19 USB RF DRIVER BIAS at TP8 No modulation Mike Gain MINIMUM Adjust for 3SmA idle current Reconnect TP8 Tasert a 0 150mA DC current meter Ch 19 USB RF FINAL BIAS at TP7 No modulation Mike Gain MINIMUM Adjust for 45mA idle current Reconnect TP7 Input of RF wattmeter and 50 cha Ch 19 USB RRIER BALANCE 25 watt dummy load to antenna Mike Gein MINIMUM Adjust for MINIMUM RF input No modulation output Check LSB and readjust if necessary for MINIMUM RF output Input of RP wettmeter and 50 ohm Ch 19 USB IR 25 watt dummy load t antenna Mike Gain Maximum Adjust for 11 0 watts PEP input Inject a two tone 50nV RF output maximum signal at Mic input Input of RF wattmeter and S ohm Ch 19 AM 25 watt dummy load to antenne Mike Gain MINIMUM Adjust for 4 0 watts RF input No modulation output maximum Input of RF wattmeter and 50 cha Ch 19 AM 25 watt dummy load to antenna Mike Gain MINIMUM d Adjust so that PWR meter input No modulation S RF MOD S RF agrees with RF wattme DEO TRUTH CHART 1 7 98 Volts c Co LD SON 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 205 5 0000 De ont 2 ococo OO a 0 0 Volts 162 PROGRAM DIVIDER ADO ooo 0000 o0 GOA GO DO SO O 000 DO O
7. n coll Adjust for maximum output Output of signal generator thru OluF to antenna input 27 186MHz no modulation L5 L6 17 L8 L9 L10 Adjust for maximum output If necessary readjust L3 and L4 for maximum NOLONIHSVA CO0LOOL 1300W INIGISI A E r te TRANSMITTER ALIGNMENT Connect an RF wattmeter and S0 ohm 25 watt dummy load to antenna connector NOTE Be sure to check transmit frequency and power on all active channels after alignment of transmitter See page 4 for channel frequencies KEEL Input of RF wattmeter and 50 ohm Ch 19 USB Set VR7 to MINIMUM 25 watt dummy load to antenna Mike Gain Maximum Adjust for maximum RF output input Inject a two tone S0nV signal at Mic input Input of spectrum analyzer or harmonic meter to antenna input Ch 19 AM Mike Gain djust for MINIMUM at 54MHz 2nd harmonic MINIMUM TRANSMITTER ADJUSTMENTS Connect an RF wattmeter and 50 ohm 25 watt dummy load to antenna connector NOTE Be sure to check transmit frequency and power on all active channels after adjustment of transmitter See page 4 for channel frequencies TEST EQUIPMENT Input of DC meter to TP1S Ch 19 AM Adjust for 13 80 volts Input of oscilloscope or modula Ch 19 AM MOD METER tion meter to antenna input S RF MOD MOD Adjust so that MOD meter agrees with external
8. uit race 41 mamas ST er 634 PRESIDENT MODEL 1001002 WASHINGTON l2 e e Hee P imr m al E E e ars X E pa 3t Circuitry not used in some versions 7 Circuitry used in some versions 9 See ports list Nominal value Ground rn Chassis V Common tie point Signal path Voltage path PHOTOFACT STANDARD NOTATION SCHEMATIC WITH ST Tem rv Howard W Sams amp Co Inc 1978 30 ECB TRIO thru TRIZ Bottom view 123456789 2 Front wew e i e SU mETC sb Oca ume SES rss Measurements made in Channel with switching s shown unless noted Hem numbers in rectangles appear in the alignment adjustment instructions Supply voltage maintained as shown at input Voltages measured with digitol meter no signal Controls adjusted for normal operation Arrow at control indicates direction of advance Terminal identification may not be found on unit Resistors are 1 2W or less 5 unless noted Value in used in some versions WE E A BR RRB LIBE CRM ie E EE a GENE qo a md S zcy acen PLL AMP PLL AMP 19 E Part di Ic PROGRAMMABLE DIVIDER 192473 152473 1592473 isan ge SRIKZ SRIKZ 1 87 V MAT CHD Lev M mA MAT CHI
9. ut GOA D _ IVO t O C3 O 0 DIVIDER INPUT IN MHz AT AM REC VCO QUTPUT IN MHz AT TPT 35 1575 35 1675 35 1775 35 2075 35 1525 35 1625 35 1725 35 1825 35 1925 35 2025 NO19NIHSVM LO01001 1300W ANIGISTUd P bj bd IN Ly i p TE ES A yee 9 c MN m Re Awe 2 BCBL NOISE BLANKER ee ARA ch mm Termina Guldes Mon gpnioo s 245858 792810 12345678 Ka 65 Front view Front view Tota e Th PM d Eco el RO ES some ic TR thru TAZ dd TRIM TRIO RAI TRI ue TR27 thru TRIS Front view Front view TRN WA TRIS TRY TRIB Front view TRO TREM TRAS Cotten view 11 Circultry not vied in same versions Circuliry used in some versions See ports list A Nominal velve 5 Bae We ee Shift Grond e CLE JE MMC wie Ch nh PE 9 EA Coen tlt pole i ovsse D C Bel per Ga o Q Voltuge palh e El ze ei la WEE da Chonnal with switching Blm E tesi mibr rn gege in the Mia d Fa dach g RF AIC Supply voltage maintained os shown at input M suv we Voltages measured with digital meter no signal Controls adjusted for norma operation Arrow at control indicates direction of advance Terminal identification may not be found on unit Resistors are 1 2W or less 5 unless noted Valve in used in some versions A PHOTOFAC
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