RCA-Victor-Co-Inc-RC-527-A 电路原理图.pdf

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1、PAGE 333-0 Chassis No. RC -527, 527-A MISCELLANEOUS ASSEMBLIES Back-Back cover-Model 15BP1 Crystal-Dial scale crystal-Models 158P2, 15BP3, 15BP4, 15BP5, 15BP6 Crystal-Dial scale crystal-Model 15BP1 Fastener-One set of 4 push -on fasteners for back cover-Model 15BP1 Fastener-Push-on fastener for crys

2、tal-Model 15BP1 Fastener-Snap fastener for power cord door Handle-Carrying handle-Model 15BP6 Handle-Carrying handle-Models 15BP2 and 15BP4 Handle-Carrying handle-Model 15BP5 Handle-Carrying handle-Model 15P3 Knob-Black volume control power switch or tuning knob-Models 15BP3 and 15BP5 Knob-Brown vol

3、ume control, power switch, or tuning knob-Models 15BP1, 15BP2, 1513P4, 15BP6 Spacers-One set of rubber spacers for control shaft Decalcomania - Trade - mirk decal Handle-Carrying handle RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. RMIt 收音机爱 好者资料库 RadioFans.CN PAGE 334-

4、C 158P SERIES 15BP-6 15BP-4 4-egfe Fidelity Change: Should accentuation of the higher audio fre- quency register he desired, capacitor C-15, con- nected across the 1st A.F. output, may be decreased from 390 mmfd. to 100 mmfd. Some production instruments will have this change already applied ; theref

5、ore. circuit diagrams should be revised accordingly. Hum: Occasional cases of hum on Model 15BP instruments may often be reduced by applica- tion of the following: (a) Shield the 1H5GT 2nd det. A.F. tube by means of a tube shield securely grounded. (b) Insert a filter network in the 1st audio plate

6、circuit as shown in the accompany- ing diagram. 12k (000NQ CONVERSONGUNGJOTO4551tC 1E -Al (vC vg4Mltx ANT. TD GR1D gE (AVC GROtMDFD) 45SNC LOOP 28 Pa u xcaL E5oT5R v aw 2ND. DET.-AF 1HSGT CIS ADD 0.1 MFD. I STOCK p4-639 +B Alignment Procedure Precautionary Lead Dress. - 1. Lead from I -F tube grid a

7、nd from the loop to variable capacitor should not he disturbed after receiver has been aligned. 2. Grid lead to the 1N5 -GT tube should be kept away from leads to filament resistors. Steps Connect the high side of test- oscillator to- Tune test-osc. te- Turn radio dial to- Adjust the follow - ing fo

8、r max. peak output- 1N5GT I -F grid cap, in series with .01 mfd. 455 kc Quiet point at 1,600 kc end of dial L8, L7 (2nd transformer) 2 1A7GT lst-Det. grid cap, in series with .01 mfd. L4, L3 transformer) 3 radiated signal 1,720 kc signal frequency C22 (Osc. Trimmer) 4 radiated signal 1,400 kc C20 (A

9、nt. Trimmer) 5 radiated signal near 600 kc L6 (Rock in) 6 Repeat steps 3, 4 and 5 until aligned. c R12 ADD 100,000.n. STOCK 1$ 14560 (4NC)- - (455 KC) IPE (400 v) ONE I.SV. A-EVEREADY No. 743 OR EQUAL. TWO 45V. B-EVEREADY No.45206 EQUAL. INSGT F. IC ,. F TRANS F 11L 11*. C45RE C51$ o CR 5id 0 y5- NI

10、P q 10 IILIF. 4 M u .5 = Dial Cord Slippage: To remedy dial cord slippage, on Model 15BP add an extra turn of cord around the drive shaft, with let lengthening the cord, thus securing better grip and increased spring tension. RM ,/VVV S.GMEG ROV MV BOTTOM VIEW OF TUSE 50CNET5 RR wm CM ji R13 2.2 AIF

11、b. comm. ElildaFomw 44 wv Fpw.TFR 5007, ti- 4, p CI.RRNT RIS 8250 APPROX. GAIN MTA USING RCA RIDER CNANALVST TI CIS 15 TOO MMF. ON SOME PRODUCTION MODELS. M LTAGES SHOULD NOLD WITHIN 20% A34.114E0 WITH CNANALTST OR TOLTOOOLTONMVST. 5T dtaL., R T T cn WIRT INERT FILAMENT CIRCUIT -POSITION 1 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN