Admiral-Y4463 电路原理图.pdf

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1、VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION DIAL STRINGING PROCEDURE START TURNS S 4Sr KC. J, loi nit. (fV SOUND I PRE AM P i (vt) 0 (vs) FNTIATIO f.MSI S3S-KC. (s) ibXo m. fe) FOR DETAILS OF STARTING PULLEY, SEE ENLARGED VIEW BELOW. PULLEY SHOWN WITH AM TUNING CAPACITOR FULLY CL

2、OSED AND DIAL POINTER AT LOW END OF SCALE. ENLARGED VIEW OF STARTING PULLEY ET l AN DET los.? mc. IQS the. Ml Ov SI FMRFAMP* AnsVoa5n“ -L IFREO. DOUBLER X- S5 10.1 MCj IPJ(V) treKeo ad. TOP VIEW OF 7N2A CHASSIS ADJUSTMENTS INDICATED BY DASHED LINES ARE UNDER CHASSIS TOP VIEW OF FM TUNER SHOWING ALIG

3、NMENT LOCATIONS tis located at rear of tuner. is accessible through hole for (5). (jj)is slug nearest the escutcheon. I/ is accessible through a hole in tbe bottom of the chassis (See chassis layout at left). 3 收音机爱 好者资料库 RadioFans.CN VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION A

4、DMIRAL Model 7N2A FM-AM Stereo Radio Tuner (Diagram across pages 4 and 5, other data page 3) 1/26C9 FMRF AMPLIFIER VIA FM TUNER 53D4-1 1/26C9 FM MIXER i DSC (ry j-ip to MEc 4- FM AFC A diodeT CR IE555 r“ .V. ll*. 1/ 6BE6 AM MIXER i DSC / Is! _ I f ft(D I X1_ in _ R2J _i_ C1 to. me 3 mu- oss/C *. mis

5、s oiMitwtsi sncmio m ns is rot i t/i war. to*, m cinctrois t Hieioftim. s. rotenot switch ss show* t* t*maw ttm fuuT cmnoaoctwiso. tn( sw/rcM/n siotitci /s m- m- m/.mri. mtto s. hoi wis Musmo with urr tc mm. x 4 of tens chassis (torn SHOW* ll AM POSITION 300NMF=p R|6 Rlt 6.A C32 Cil SERVICING FM STE

6、REO Trouble shooting can be accomplished by making voltage measurements without a signal. Signal tracing is possible with an oscilloscope and an FM stereo generator applying a pilot signal to the antenna. Signal tracing is also possible by injecting a 19KC CW signal at pin 7 of V6A. 7N2 SCHEMATIC Th

7、e 7N2A schematic shown above can be used for servicing the 7N2 chassis if you will note the following exceptions: the 7N2 does not have transistor Ql, stereo indicator lamp M14, recti fier CR4 and other associated wiring and com - ponents of the FM Stereo Indicator circuit. Addition of the FM Stereo

8、 Indicator circuit to the 7N2 chassis is not recommended. 7N2A SCHEMATIC NOTES 1. Stereo indicator circuit with asterisks (*) only in 7N2A chassis. C89 used only when T10 is 72D237-4. 2. Unless otherwise specified: all resistors lA watt, 10%, all capacitors in microfarads. 3. All voltages measured w

9、ith 117V AC input. 4 收音机爱 好者资料库 RadioFans.CN 4. Function switch, S3, shown in AM position (knob fully clockwise). The switching sequence is AM - FM - FM Stereo - Phono. 5. -if denotes chassis ground. RUN NUMBER CHANGES 7N2 chassis are not stamped with run numbers. 7N2A chassis were stamped RUN 10 at

10、 the start of production. Cl7 was changed from .02 to .1 mf, 50V ceramic. C16 and C21 were changed from .01 to .1 mf, 50V ceramic. R6, R9 and R25 were changed from 1 megohm to 220,000 ohms, lA watt. R82, 470,000 ohms, A watt was added. The following change was made at RUN 12 to eli minate possibility of 10KC AM beat interference in weak signal areas: The following changes were made at RUN 11 for improved AFC reliability: 5 Added C91, 330 mmf ceramic disc. 收音机爱 好者资料库 RadioFans.CN