midland_77_805_sch.pdf

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1、8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 DD CC BB AA B+ FM MOD BTX 8V BRX 8V RX=GND BRX 8V B+ PLL 8V BRX 8V BTX 8V FM MOD PLL 8V BTX 8V B+ 13.8V MIC AUDIO TX=GND B+ 13.8V SW B+ 13.8V TX=GND TX=GND RX=GND PLL 8V CHASSIS GND GND GND SizeDocument NumberRev Date:Sheetof 1.1 DRAWN BY: Rick Jackson Euro Radio Co 1

2、1Wednesday, November 28, 2007 MIDLAND 77-805.SCH SizeDocument NumberRev Date:Sheetof 1.1 DRAWN BY: Rick Jackson Euro Radio Co 11Wednesday, November 28, 2007 MIDLAND 77-805.SCH SizeDocument NumberRev Date:Sheetof 1.1 DRAWN BY: Rick Jackson Euro Radio Co 11Wednesday, November 28, 2007 MIDLAND 77-805.S

3、CH CHANNEL SWITCH LM7808 1 2 3 D111 To D114 ARE 1S2473 IC103 LOW POWER MIDLAND 77-805 R315 TO R318 = 1K2 LED1-4 B + = ALWAYS 8 VDC BRX = 8 VDC IN RX BTX = 8 VDC IN TX PLL = 8 VDC + - Euro Radio Co Euro Radio Co Euro Radio Co Euro Radio Co B + = ALWAYS 8 VDC BRX = 8 VDC IN RX BTX = 8 VDC IN TX PLL =

4、8 VDC NOTES: Diodes 1S2473 and MA150 can be replaced with 1N4148. Diodes OA90 can be replaced with 1N60. Noise TX audio, check C176 known to go low, replace with 16-volt type. Low TX audio, check FM Pre-Set RV105, know to go o/c. TX audio clipping at HI frequency, check D111 to D114. TX audio clippi

5、ng at LOW frequency, check C181. Output power very low about 100 to 200 mw, Check Q110 go low gain. VCO will not lock, check C219 known to give problems. Squelch not working, check D1001 and D104. Replace with 1N60. C105 47n C105 47n Q110 MPS9246 Q110 MPS9246 C118 10n C118 10n C1014 10n C1014 10n C1

6、03 10p C103 10p 2222 R179 4K7 R179 4K7 C301 120p C301 120p Q104 MPS9426 Q104 MPS9426 R134 4R7 2W R134 4R7 2W 1 4 2 5 3 MIC SKTMIC SKT R143 1K R143 1K R138 4K7 R138 4K7 L108 3203901 L108 3203901 C125 27p C125 27p Q115 MPS9246 Q115 MPS9246 R164 3K3 R164 3K3 L122 25uH L122 25uH TH1 300r TH1 300r R117 6

7、8K R117 68K R142 68R R142 68R R504 4K7 R504 4K7 C114 150p C114 150p C222 1n C222 1n C117 10n C117 10n L125 10uH L125 10uH C179 10u C179 10u R1007 39K R1007 39K 10 11 14 15 12 13 16 1 2 3 4 5 6 7 8 9 3 8 FILTER AMP SQUELCH TRIGGER AMP MIX LIMIT DEMOD Vcc IC101 MC3357 FILTER AMP SQUELCH TRIGGER AMP MI

8、X LIMIT DEMOD Vcc IC101 MC3357 RV103 22K RF METER RV103 22K RF METER X101 10.240 Mhz X101 10.240 Mhz R139 4K7 R139 4K7 C228 10n C228 10n C124 100u C124 100u R186 220R R186 220R C135 10p C135 10p D101 1S2473 D101 1S2473 D102 1S2473 D102 1S2473 L121 0.8uH L121 0.8uH C132 1n C132 1n C113 5p C113 5p R14

9、6 68R R146 68R L201 22uH L201 22uH R502 180R R502 180R C171 10n C171 10n 1 2 3 4 5 6 7 8 9 10 IC104 KIA7217AP 1 2 3 4 5 6 7 8 9 10 IC104 KIA7217AP C151 33u C151 33u C133 10n C133 10n 1 411 3 2- + IC105A LM324 - + IC105A LM324 C502 10uF C502 10uF C206 20p C206 20p D1013 OA90 D1013 OA90 C123 10n C123

10、10n D110 MV2209 D110 MV2209 C101 10n C101 10n C170 10n C170 10n Q102 9426 MPS Q102 9426 MPS C184 10n C184 10n R151 470R R151 470R 7 5 6- + IC105B LM324 - + IC105B LM324 RV101 2K2 SQUELCH PRESET RV101 2K2 SQUELCH PRESET C158 1p C158 1p C202 10n C202 10n L107 3203187 L107 3203187 D105 OA90 D105 OA90 D

11、107 1S1555 D107 1S1555 C172 180p C172 180p C235 10n C235 10n Q103 9426 MPS Q103 9426 MPS L202 22uH L202 22uH 50KA VOLUME 50KA VOLUME C167 60p C167 60p C161 100p C161 100p R110 1K R110 1K C165 180p C165 180p C116 47p C116 47p C196 10u C196 10u 8 10 9- + IC105C LM324 - + IC105C LM324 R1004 33K R1004 3

12、3K R154 2K2 R154 2K2 C193 15p C193 15p C226 10n C226 10n D106 OA90 D106 OA90 C219 36p C219 36p R112 1M R112 1M L105 3202762 L105 3202762 R137 2K7 R137 2K7 R181 1K2 R181 1K2 R111 4K7 R111 4K7 R172 10K R172 10K C164 180p C164 180p C197 10n C197 10n 1111 R153 33K R153 33K Q109 MPS9246 Q109 MPS9246 C100

13、2 1u C1002 1u L112 0.3uH 3200328 L112 0.3uH 3200328 D109 MV2209 D109 MV2209 R161 220K R161 220K C131 1n C131 1n L103 3204126 L103 3204126 R182 6K8 R182 6K8 RV102 10K S METER RV102 10K S METER R171 10K R171 10K C153 10n C153 10n C199 1u C199 1u R136 390R R136 390R 1010 C304 10n C304 10n R1008 22K R10

14、08 22K C216 120p C216 120p Q113 MPS9246 Q113 MPS9246 C162 100p C162 100p R120 5K6 R120 5K6 D116 MA150 D116 MA150 G G R180 10K R180 10K C107 10n C107 10n 1515 R170 10K R170 10K C212 120p C212 120p 2525 R160 22K R160 22K C195 10n C195 10n C136 10n C136 10n L116 3204139 L116 3204139 C211 27p C211 27p R

15、147 5R6 1/2W R147 5R6 1/2W R122 10K R122 10K C139 68n C139 68n C217 220p C217 220p 2626 R183 470R R183 470R C175 47n C175 47n L110 3205208 L110 3205208 1616 R169 20K R169 20K P1 1 P2 2 P3 3 P4 4 P5 5 P6 6 TEST 7 CH19 8 CH9 9 MC 10 T/R 20 FIN 19 VCC 18 AO 17 AI 16 PD 15 LD 14 GND 13 RO 12 RI 11 IC102

16、 LC7136 IC102 LC7136 R109 390R R109 390R R158 100K R158 100K R135 150K R135 150K C121 10n C121 10n CF1 10.7 CF1 10.7 C142 10n C142 10n R156 150K R156 150K C163 560p C163 560p C238 470n C238 470n L113 0.5uH L113 0.5uH Q105 MPS9681 Q105 MPS9681 R106 470R R106 470R Q111 2SC2314 Q111 2SC2314 D108 1N4003

17、 D108 1N4003 C181 15n C181 15n R506 1K2 R506 1K2 R174 220K R174 220K C209 22n C209 22n Q114 MPS9246 Q114 MPS9246 C302 10n C302 10n R118 470R R118 470R R155 1K R155 1K L123 6u8H L123 6u8H R131 10K R131 10K C159 27p C159 27p C169 80p C169 80p C129 10n C129 10n C115 47n C115 47n C166 220p C166 220p CH1

18、01 CHOKE CH101 CHOKE C182 10n C182 10n Q112 2SC2078 Q112 2SC2078 TP1 VCO TP1 VCO D103 1S2473 D103 1S2473 R150 R10K R150 R10K 1 2 3 CF2 455 CF2 455 1818 C208 68n C208 68n R162 2K7 R162 2K7 C207 5p C207 5p T5 3203143 T5 3203143 C109 10n C109 10n C213 10u C213 10u R140 100R R140 100R R1020 2K2 R1020 2K

19、2 C134 470n C134 470n C144 68n C144 68n R196 47K R196 47K C150 68p C150 68p 2121 C234 4u7 C234 4u7 D115 1S2473 D115 1S2473 R102 18R R102 18R C183 10n C183 10n 1919 SP1 SPEAKER SP1 SPEAKER C236 47n C236 47n R175 2K7 R175 2K7 C155 10n C155 10n C127 68n C127 68n L115 3201424 L115 3201424 R157 4K7 R157

20、4K7 C218 5p C218 5p R163 100K R163 100K C110 27p C110 27p C214 10n C214 10n C189 330p C189 330p R124 100K R124 100K D104 OA90 D104 OA90 R144 10R 1 WATT R144 10R 1 WATT L109 3203187 L109 3203187 R178 4K7 R178 4K7 C102 10n C102 10n C194 82p C194 82p L126 1uH L126 1uH SW2 ON/OFF SW2 ON/OFF Q101 MPS9426

21、 Q101 MPS9426 R168 10K R168 10K R149 1K R149 1K C178 10n C178 10n 1212 C141 220p C141 220p C128 10p C128 10p C198 33p C198 33p C221 33p C221 33p C303 10n C303 10n C241 10n C241 10n R189 390R R189 390R SW1 HI/LOW POWER HI LOW SW1 HI/LOW POWER HI LOW RV501 470R RV501 470R 2020 C229 82p C229 82p Q107 M

22、PS9623 Q107 MPS9623 D1001 OA90 D1001 OA90 R105 2K7 R105 2K7 C156 1000u C156 1000u L101 3203164 L101 3203164 RV105 22K RV105 22K L124 0.5uH L124 0.5uH R177 220K R177 220K C149 180p C149 180p R152 10K R152 10K R1009 90K R1009 90K VCC 7 Q1 2 Q2 3 Q3 4 Q4 5 Q5 6 I/P 8 GND 1 IC106 TL489 IC106 TL489 L111

23、3201424 L111 3201424 C191 10n C191 10n C137 1u C137 1u C227 10n C227 10n C225 150p C225 150pC143 2n2 C143 2n2 C215 27p C215 27p R501 330R R501 330R R101 2K2 R101 2K2 C185 100u C185 100u R1011 10K R1011 10K R148 1K2 R148 1K2 2424 R176 22K R176 22K C154 68n C154 68n R115 2K2 R115 2K2 C204 56p C204 56p

24、 R141 68R R141 68R R123 100K R123 100K R125 100K R125 100K 2323 R132 820R R132 820R R133 330R R133 330R L118 0.8uH L118 0.8uH R104 82K R104 82K JK1 EXT SPKR JK1 EXT SPKR C157 47n C157 47n L102 3204117 L102 3204117 C200 10n C200 10n C176 10u C176 10u C147 47u C147 47u C148 4u7 C148 4u7 R159 47K R159

25、47K R116 4K7 R116 4K7 C205 35p C205 35p C190 10n C190 10n R126 1K R126 1K C1013 47n C1013 47n C146 220u C146 220u C106 10u C106 10u C201 10n C201 10n C177 47u C177 47u PL259 BNC PL259 BNC 10K SQUELCH 10K SQUELCH C126 68n C126 68n C203 27p C203 27p C192 10n C192 10n Q108 MPS9623 Q108 MPS9623 R1006 1K2 R1006 1K2 C223 10n C223 10n R114 2K2 R114 2K2 R185 820R R185 820R R505 82R R505 82R