Zenith-Radio-Corp-9L20 电路原理图.pdf

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1、VOLUME R-24. MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION 9 B N I T M 9L20 SCHEMATIC FOR MODELS ML2605, ML2606, ML2607, ML2608, ML2610, ML2636, ML2785, ML2786 AND 7200. ar m. FOR FM TIMER ORCUtT IS- 6KX7) I REFER TO SCHEMATIC DIAGRAM | VSA RATIO DETECTOR AM DETECTOR SG07 0R6BC7 -J jjsj DIAL CO

2、RD DRIVE SHOWN IN FULL COUNTERCLOCKWISE POSITION WMl 1 If CORO - ON BACK OF SMALL SHAFT - SSk/XPIN AND START jPgJ 6 COMPLETE TURNS (GW) DN FRONT OF SMALL SHAFT PIN AND START I TURN (CW) ON BACK OF URGE SHAFT- KNOT AND START 5/2 COMPLETE TURNS (CW , ON FRONT OF LARGE SHAFT- KNOT AND START I TURN (CCW

3、) L3, FM-1 OSCILLATOR COIL L2, FM DETECTOR COIL CORD - CORD 0 CORD C CORO 0 1 (CCW) COUNTERCLOCKWISE (CW) CLOCKWISE 188 收音机爱 好者资料库 RadioFans.CN VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION ZENITH 11L8T25 TUBE LAYOUT FOR MODELS ML2668, ML2670, ML2675, ML2685 AND 7500. TEST MINTS A

4、1st FM LIMITER GRID B 2nd FM-AM I F GRID_ C 2nd FM UMITER GRID 0 AN CONV. GRID_ E Isl FM-AM-I.FORIP_ F FM CONV. GRID_ 6 AM RF CRIP H FM ANTENNA_ J RATIO DET0UTPUT-67KC TRAP K MX. STEREO MONAURAL L I9KC-00UBLER_ M PET. COIL PEAK-PHASIN6 N NX PHASING T, , T8.3RDAM I.F. TRANSFORMER- LI6. PRIMARY BOTTOM

5、 LI7, SECONDARY TOP T7 ,2ND AM I.F TRANSFORMER LI4, PRIMARY BOTTOM / LI5, SECONDARY TOP / TI . I ST FM I.F. TRANSFORMER L4, primary bottom L5, SECONDARY TOP T6,1ST AM I F. TRANSFORMERS, L, PRIMARY BOTTOM L22, SECONDARY TOP STEREO TAPE INPUT/ RIGHT CHANNEL LEFT CHANNEL -T 3, 3RD FM. I.F. TRANSFORMER

6、LB, PRIMARY BOTTOM L9 , SECONDARY TOP rT2 , 2ND FM I F TRANSFORMER L6 , PRIMARY BOTTOM L7, SECONDARY TOP rMUTE POTENTIOMETER r-T4, 4TH FM I.F. COIL HT10, DOUBLER COIL / I9KC / O (gHb) o (6BN -T5 , RATIO DETECTOR II0.7MC) Ul, U2, PRIMARY BOTTOM LI3, SECONDARY TOP rT9 , I9KC INPUT COIL TII, 38KC DETEC

7、TOR COIL rTI2, 67KC TRAP COIL -121-273 PRE-AMP (4-REOD) STEREO PHONO INPUT (From CHANGER) 121 -274 PRE-AMP (2 REOD) F.M. CABINET- ANTENNA TERMINAL To CABINET5 AM ANTENNA v 121275 PRE-AMP (2 REOD) TAPE JACK AND ANTENNA - TERMINAL STRIP ASSEMBLY BALANCE AND - LOUDNESS CONTROL AM IF 455 KC. C37f,am osc

8、illator trimmer FM IF 10.7 MC.C370iAM|)ETECT0RTRIMMER/ C37B.AM ANTENNA TRIMMER PUSH ON-PUSH OFF FM FM-AFC AM PHOMO TAPE MONAURAL STEREO* EXT. STEREO -TUNING INDICATOR -LI.FM ANTENNA COIL STEREO INDICATOR -SELECTOR SWITCH S-61017 AND S-61363 SCHEMATIC FOR FM TUNER USED ON CHASSIS 9L20 AND 11L8T25. F.M. ANT. T TEST POINT *F 1ST FM IF L2 FM DET/oto* woe a p Vl-A A FM-RF I/2 6JK8 Vl-B FM-CONV. 1/2 6JK8 - ) V 1-tJ/ X | C9 22: 2XI2MMF MMF , 5% i5* 3L+ -r-_l_I icis_ck.u_ i .oopp Sol ki? HciB Oijpl r5, F.T. F.T. A6C HTR CONV. 6.3V 8+ 189 收音机爱 好者资料库 RadioFans.CN