Zenith-Radio-Corp-8LT40Z1 电路原理图.pdf

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1、VOLUME R-25, MOST-OFTEN-NEEDED 1965 RADIO SERVICING INFORMATION ZENITH RADIO CHASSIS 8LT40ZI MODEL ROYAL 500H-1 (Continued on the next page, at right) 121-248 MATCHED i$oo OUTPUT ov l2l-234 _l* its ttim as I D.P.ST SWITCH |tlO% I 0,1 CONTHOt -1 Ji VJ iv vrxaw, | .x“ saw ISI-E4T 121-241 VIOLET SUCK S

2、LACK VIOLET WHITE | SLUE THE HATCHING IDENTIFICATION WLL BE A COLORED NOTES: ALL RESBTORS ARE I/* W., CARBON, .% TOLERANCE UNLESS OTHERWISE SPECIFIED. ALL VOLTAGES ARE O.C. UNLESS OTHERWISE I SPECIFIED. ALL CAPACITORS ARE IN MICROFARADS I UNLESS OTHERWISE SPECIFIED. X. D.C. VOLTAGES SHOWN ARE MEASUR

3、ED FROM KD* QBOUND WITH NO SIGNAL USING A VACUUM T TUBE VOLT METEB. DENOTES GROUND MATTERY CURRENT DRAIN APPROX. S.0 MA WITH VOLUME CONTROL AT MINIMUM. SPEAKER IMPEDANCE It OHMS AT 400 CPS. -ANTENNA LOOP ASSEMBLY PNF TRANSISTORS S Qc TTP*-/- ALIGNMENT PROCEDURE ClAANT.TRIMItiiR1 CIC OSC. TRIMMER 121

4、-247 DRIVER x 121-246 MATCHED OUTPUT SPEAKER LEADS 81-236 OSC. T5.0SC. TRANS. 121*234 R F L2.R.F, COIL 121-234 MIXER -T|, 1st I.F TRANS. 121-235 1st |.F. T2,2nd I.F.TRANS T3,3rd I.F TRANS. 121-236 2nd I.F Input Signal Connect Inner Conductor Set Dial At Trimmers Frequency From Oscillator To 455 KC 6

5、00 KC Adj. Tl. T2 T3 for Maxi mum output 455 KC 600 KC Adj. L2 for Minimum out put 1620 KC ONE TURN Gang Videopen ClC 600 KC LOOSELY Near 600 Adjust slug COUPLED TO THE ANTENNA Repeat Steps 3 8s 4 TRANSISTOR & TRIMMER LAYOUT For I.F. Alignment Tune Trap to IF Frequency Set Oscillator To Dial Scale A

6、djust T5 for Max imum output while rocking gang. Tune T5 for Maximum out put regardless of dial accuracy Align Loop Antenna CHASSIS INFORMATION CHART CHASSIS PART NO. MIXER OSC- 1ST I.F. 2ND I.F. CRYSTAL DIODE DETECTOR DRIVER OUTPUT- OUTPUT SUPPLIER 8LT40Z1 Zenith Type E.I.A. 121-234 PNP GC282 121-2

7、34 PNP GC282 121-236 PNP GC284 121-235 PNP GC284 121-236 PNP GC284 103-19 or 103-44 121-247 NPN GC608 121-248 Pair NPN NPN GC609 Texas Instrument 180 收音机爱 好者资料库 RadioFans.CN VOLUME R-25, MOST-OFTEN-NEEDED 1965 RADIO SERVICING INFORMATION ZENITH RADIO Model Royal 500H-1 - Chassis 8LT40Z1 (Continued f

8、rom preceding page, at left) Ilume |)TROL T5 65-2055 osWlator U2 105-59 INTEGNET 17 n L2 95-2128 R. F. COIL 121-234 MIXERS M OSC 5)1 II 121-247 .DRIVER INTEGNETjlgl T1 J L 95-2125 I- HI I.F. TRANSFORMER_ ANT. SECTION GANG T4 95-2043 DRIVER -TRANSFORMER 121-235 lit l,F. U3 105-71 _ INTEGNET -_i I l39

9、0 I | m T2 95-2126 I- 2nd I F TRANSFORMER- 114 105-55 INTEGNET- T3 95-2127 3rd I.F. TRANSFORMER- rl - CIO I JX100 MFD 121-248 MATCHED OUTPUT 121-236 2nd I.F.- U5 105-49 INTEGNET. NTEGNET- 1_JS?_J CHASSIS, WIRING AND COMPONENTS LEGEND BBASE CCOLLECTOR EEMITTER VIEWED FROM WIRING SIDE 181 收音机爱 好者资料库 RadioFans.CN