RCA-Victor-Co-Inc-VHR-207 电路原理图.pdf

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1、PAGE 761-C Model VHR-202 MODELS VHR-202, VHR-207, VHR-407 Chassis No. RC -548 RC -547 RC -547A Home -Recording Radio- Phonograph Combinations Model VHR-207 Electrical and Mechanical Specifications FREQUENCY RANGES Broadcast, A Band 540.1,600 kc Short Wave, B Band (VHR-207, 407) 1,550-4,000 kc Short

2、Wave,C Band 5,800.18,000 kc INTERMEDIATE FREQUENCY TUBE COMPLEMENT VHR-202 455 kc VHR-207, 407 R -F Amplifier RCA6SK7 Ist-Det., Oscillator .RCA-6SA7 RCA-6SA7 I -F Amplifier . RCA-6SK7 RCA-6SK7 2nd-Det., A.V.C., Phase Inverter RCA -6Q7 RCA -6Q7 1st-A-F Amplifier RCA-6SJ7 RCA -6S17 Power Output RCA-6K

3、6GT (2) . RCA6F6G (2) Microphone Pre -Amplifier RCA-6Q7.RCA12K7GT Contractor Rectifier RCA -6H6 Magic Eye Indicator.RCA-6U5 RCA -6U5 Rectifier RCA-5Y3G .RCA-5U4G PHONOGRAPH (RP -155) Type Automatic Record Capacity. Eight 10 -inch or Seven 12 -inch . Turntable Speed 78 r.p.m. Drive. Motor drive throu

4、gh idler on inside rim of turntable Type Pickup Crystal Pickup Impedance 100,000 ohms at 1,000 cycles Average Output. 11/2 volts at 1,000 cycles across 1/2 meg. RECORDER Recording Head (cutter) Cry,ral REFER TO INDEX FOR DATA ON DRIVE CORD DIAL POINTER SHOWN WITH GANG AT MAX. CAPACITY. Model VHR-407

5、 POWER OUTPUT VHR-202 Undistorted watts 5 Maximum watts VHR-207, 40: 10 55 12 LOUDSPEAKER (Electrodynamic) RL -70M-6 RL -70M Diameter 12 -inch 12 -inch Voice -coil impedance at 400 cycles 2.2 ohms 2.2 ohms POWER SUPPLY RATING 105.125 volts, 60 cycles 140 watts 200 watts CABINET DIMENSIONS VHR-202 VH

6、R-207 VHR-407 Height (inches) 34 36 34 Width (inches) 32 35 343/4 Depth (inches) 17 171/8 19 TUNING DRIVE RATIO 15 to 1 Impedance of Cutter at 1,000 cycles Approx. 60,000 Turntable Speed 78 r.p.m. Grooves Cut per Inch Approx. 115 Inches Cut per Minute Approx. .713 inch Recording Blank Discs Coated m

7、etal -base or coated paper -base Recording Disc Diameter Up to 10 inches Drive Motor drive through idler on inside rim of turn- table; the turntable spindle drives a lead screw which guides the recorder arm from outside of recording blank to inside AUTOMATIC RECORD CHANGER Dial Drive Cord Arrangemen

8、t A WeIG MT TOP OF ARM -C- WEIGHT II10011lATM WEIONT d+ SIDe 5OlT3 VGRTICAI BOLT HORIZOMTAL .B. Three Mounting Arrangements of Follower -Arm Weight on Home Recording Models VHR-207, 407 1 2K7 -GT Bumouts: When shooting trouble or when testing Models VHR 207, and VHR 407 do not under any circumstance

9、s short the +B to ground with screwdriver or any other tool as a test for plate voltage. A +B short will burn out the filament of the 12K7 -GT microphone pre -amplifier tube. Always test for +B voltage on the chasses with a voltmeter and not with a screwdriver. RCA VICTOR DIVISION OF RADIO CORPORATI

10、ON OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 762-C VHR-20Q, YHR-207, VHR-1:07 at. ore u8 . ag eloOOQQ OpO t m aiy v -2LL o;21-)N8 vtfi5 , e ai 3 23 f i UN Cg r4 2,-.1 y01 O NF N/Y- jr el N3:F Nl ,U and u 9 =H1 . W s g ; t0 u 8U L_0/ 11 G r Cf Cc+3 Oi M IHp g 3 rit$ O Hr LLN 000

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12、d7 N:. LJ N.12 O 20111 ( a re 4- m m HI a4 + U ,a al-H 2 -1! 51 , 00 r I 1 5S 3$ s ; ees r9 (V J F N O 3010 waaa W n;, _S :x = r Z r o s ug m i+ W sit. C Y oy. n3p rt 6 Q 1 I I I I I I p w U Ir Oa+- C a0 .x g mn I, CW I I f r L .A.i. d IU 7 Y Y(Yr3yNd P.TJ .t O 60 3 NNmON44NJ C O 7. O 9ly 9.f1_F m m

13、 o G7 _Nn ,13 , Zx A ik O i s9 85 =r m r mZ :Ii g. !3 iG N p PAGE 765-C YHR-202, YHR-207, YHR-407 PAGE 766-C YHR-202, VHR-207, VHR-41.07 Alignment Procedure INCHES 1 2 3 4 5 11111111111111111111111111111111111111111111111111111111111111111111111111111IIIIII111I1111111611111 A 011,0 49M 40M INTERNpT1

14、0NPL 31M 25M AMTR 19M .4444 16M 6 : il : 0 U . : 0 6 I ;0.,9 .90. _._._._._ ._._,. . M. At Right-Calibration Scale for VHR-207 and VHR-407. This also applies to Model VHR-202, except B Band is omitted. 1 55 60 10 0 I00 I20 I40 160 sralloago BRCFUCFIST 407 . W 513.211.G3m2.5RED=m33.54.0. . a . . M .

15、. . RED= . . a . . . . a . . . . SPECIPE SERVICES INCHES I 2 3 4 5 6 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 Cathode -Ray Alignment is the preferable method. Connec- tions for the oscillograph are shown in the schematic diagram. Output Meter Alignmen

16、t.-If this method is used, connect the. meter across the voice coil, and turn the receiver volume control to maximum. Test-Oscillator.-For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action. E

17、lectronic Voltmeter.-The electronic voltmeter in the Chanalyst or VoltOhmyst provides an unexcelled output indicator. It should be connected to the AVC bus, and the test -oscillator output adjusted to produce several volts of AVC. Calibration Scale.-The glass tuning dial may be easily removed from t

18、he cabinet and temporarily attached to the chassis for quick reference during alignment. In the event that only the chassis is returned for service, and the cabinet with its tuning dial is left in the customers home, the calibra- tion scale printed in this service note can be used in conjunc- tion w

19、ith an ordinary 12 -inch ruler as an accurate and con- venient substitute for the regular dial. Using Tuning Dial. - 1. Slide out the flat spring clamp at each end of the dial, CIO L5-OSC. 600 KC. C5 C11 -O 5C. 15.2 MC. -eD CB-oSC. i 1500 15.2 MC. /_y) C2 ANT. 1500 KC, LT- BOTTOM.- Le - TOP 455 KC.

20、TI 777-4 6115 / g32 BIAS CEL4 CAP -SHIELD ISLE TRANS. T2 L9- BOTTOM L lO-TOP 455 KC. 1.F TRANS.TR DUPLICATE RECORDING JACK PHONO JACK VAR 202 and remove the glass dial from the cabinet. 2. With gang in full mesh, move the dial pointer to the reference mark at the left-hand end of the dial backing pl

21、ate. 3. Place the glass dial under the pointer so that the extreme left scale graduations coincide with the pointer. Use scotch tape to hold the glass dial in this position. Using Calibration Scale. - 1. With gang in full mesh, move the dial pointer to the reference mark at the left-hand end of the

22、dial backing plate. 2. Place a flat 12 -inch ruler on the dial backing plate so the left -end of ruler is at the reference mark at left -end of back- ing plate. Temporarily fasten the ruler with scotch tape to the backing plate. 3. Refer to calibration scale printed in this service note. This is a r

23、educed reproduction of the dial with an inch -scale drawn at top and bottom. To find the correct pointer posi- tion in inches for any desired freq.uency, draw a vertical line through this frequency on the calibration scale. Dial -Pointer Adjustment.-After the chassis is replaced in cabinet, move the

24、 dial pointer (if necessary) so that it is at the left-hand graduation on the dial with the gang in full mesh. L8-OSC. 600 KC. CI5 C9 CIO-OSC 15:2 MC. W1: CII-OSC1 ,2A4 MC. C12- 05c -A4 1500 KC. 15.2. MC. L9 -BOTTOM _ LIO- TOP 455 KC. TRANS. TI T2 LIS LII- BOTTOM LI2- Top 455 KC. 1 240. I.F TRANS. G

25、 A CUTTER DUPLICATE RECORDING JACK PHONo d JACK VAR 407 Model H1-202 Models 1HR-207, 407 Model VHR-202 PAGE 767-C VHR-202, VHR-207, VHR-1407 Steps Connect the high side of test-osc. to- Tune test- osc. to- Turn radio dial to- Adjust the following for maximum peak output I -F grid, in series with .01

26、 mfd. 455 kc Quiet Point at High-Freq. end of C Band L9 and L10 (2nd I.F. Trans.) 2 1st -detector grid, in series with .01 mfd. L7 and L8 (1st I.F. Trans.) 3 1st -detector grid, in series with .01 mfd. 600 kc 600 kc A Band L5 (osc.) 4 1,500 kc 1,500 kc A Band Cb (osc.) 5 Repeat steps 3 and 4. 6 Ante

27、nna Terminal, in series with 47 mmfd. 15.2 me 15.2 me C Band C11 (osc.)* Cl (ant.)* 7 Install and connect chassis in cabinet. Close link on antenna terminal board. Tune in a radiated signal at 1,500 kc and peak A band loop trimmer C2. Rock in L5 at 600 kc. Repeat these adjustments. * Use minimum cap

28、acity peak if two peaks can be obtained. * Rock in C1 and use maximum capacity peak if two peaks can be obtained. Models VHR-207, VHR-407 Steps Connect the high side of the test-osc. to- Tune test- osc. to- Turn radio dial to- Adjust the following for maximum peak output 1 I.F. Grid in series with .

29、01 mfd. 455 kc C Band Quiet Point at Hi Freq. L11 and L12 (2nd I.F. Trans.) 2 1st Det. Grid in series with .01 mfd. L9 and L10 (1st I.F. Trans.) 3 R.F. Grid in series with .01 mfd. 600 kc A Band 600 kc L8 (osc.) 4 1,500 kc A Band 1,500 kc C12 (osc.) 5 Repeat steps 3 and 4. R.F. Grid in series with .

30、01 mfd. 2.44 me B Band 2.44 me C11 (osc.) 7 Antenna Terminal in series with 47 mmfd. 15.2 me C Band 15.2 me C10 (osc.)* 05 (ant.)* 8 Install and connect chassis in cabinet. Close link on antenna terminal board. Tune in a radiated oscillator signal at 1,500 kc and peak the A band trimmer Cl (on loop)

31、. Rock in L8 at 600 kc. Repeat these adjustments. * Use minimum capacity peak if two peaks can be obtained. * Rock in C5 and use maximum capacity peak if two peaks can be obtained. 850 TO I 740 TO I 610 TO 1540 TO 15501.501 1430 KC I 1 250 KC 11030 KC 6 1 5 4 1 Push Button 3 2 I 1 TRIMMER. I0 0 i, S

32、CREWS 010 0 1 0 0 1,0 CORE 6 1 5 4 1 3 2 I 1 ROOS The push buttons connect to separate magnetite -core oscil- lator coils and separate loop circuit trimmers which must be adjusted for the desired stations. Use an insulated screwdriver or alignment tool such as RCA Stock No. 31031. Allow about five m

33、inutes warm-up period before making adjustments. The procedure is as follows: 1. Make a list of the desired stations, arranged in order from low to high frequencies. 2. Turn the range switch to the broadcast position and manually tune in the first station on the list. Adjustments 3. Turn range switc

34、h to push-button position and press in the left-hand button. 4. Adjust core rod No. 1 to receive the first station. To secure the best adjustment, rotate the loop for least pickup, and adjust core rod No. 1 for peak output. 5. Adjust trimmer screw No. 1 for peak output on the first station. 6. Proce

35、ed in the same manner to adjust for the remaining statigns. 7. Repeat adjustments for best results. On the 880 to 1,550 kc push-button, the higher frequency stations may be received with core rod No. 6 either in or out (oscillator frequency either 455 kc below or 455 kc above the station frequency).

36、 The adjustment with this core in its out position (oscillator frequency 455 kc above the station frequency) is the correct one. NOTE: Clockwise adjustment of cores and trimmers tunes the circuits to lower frequencies. PAC,E 768-C VHR-202, VHR-207, VHR-1107 Recorder Operating Instructions Preliminar

37、y. - 1. See that cutter is functioning correctly. 2. Place recording disc on turntable with stud engaged in one hole. 3. Turn on power -bass control, just past the click of the power switch. Turn treble tone control full clockwise. Set radio -phono volume control to soft, and microphone volume contr

38、ol fully counter -clockwise. Radio Recording. 1. Tune in the desired radio program. 2. Turn service selector to position 3. 3. Turn radio -phono volume control so the Magic Eye just closes during loudest passages. 4. Push turntable switch on. 5. Lift the recording arm, move it over so the stylus is

39、about 1/4 -inch inside the recording disc, and lower gently on the disc. 6. During the recording, listen to the loudspeaker, watch the Magic Eye, and increase or decrease the radio -phono volume control if the broadcast level becomes too low or too high. 7. Use a fine hair brush occasionally to keep

40、 the area immediately ahead of the stylus free from chips and threads. 8. Before the cutter reaches its inner limit, lift the cutter head and place on rest. Turn off the turntable switch and remove the cuttings from the disc. 9. The recording may be played -back immediately: Turn the service selecto

41、r to Victrola, push the turntable switch on, turn power -bass control fully clockwise, place pickup needle in outer groove of the disc, and adjust the radio -phono volume control. Use a new needle for play-back. Microphone Recording. - 1. Turn service selector to position 1. 2. Turn radio -phono vol

42、ume control to its off position to prevent feed-back and howl. 3. Turn power -bass control just past the click of the power switch. Turn treble -tone control full clockwise. 4. To obtain an approximate setting of the microphone volume control before making a recording, talk into the microphone (whic

43、h should be left plugged into its receptacle at all times) and adjust the microphone volume control so the Magic Eye just closes. By talking in a fairly level tone, and by maintaining the same distance between the microphone and lips, the microphone volume control will not require continual readjust

44、ment. 5. Start the turntable and place cutter on the disc. 6. Talk into the microphone to make the desired recording, and re -adjust the microphone volume control if required, as indicated by the Magic Eye. 7. Stop the recorder before jt reaches its inner limit, turn the microphone volume control co

45、unter -clockwise and play back the recording as described in 9 above. Re -Recording. A record may be re-recorded, or duplicated (that is, a copy may be made from an original) by connecting an RCA Victrola Attachment (record player) to the re-record- ing jack on the rear of the radio chassis. The ori

46、ginal record is played on the RCA Victrola Attachment, and the copy is cut or recorded on the Home Recorder. SERVICE SELECTOR RE-RECORDING: I. CUTTING RECORDS OF VOICE OR MUSIC THROUGH MICROPHONE. 2. CUTTING RECORDS OF PHONOGRAPH SELECTIONS USI NO AUXILIARY TURNTABLE. 3. CUTTING RECORDS OF PHONOGRAP

47、H SELECTIONS WITH VOICE OR MUSIC MIXED IHTHROUGH MICROPHONE. VICTROLA 1. PHONOGRAPH RECORD SELECTI ON S. Z. PHONOGRAPH MIXED WITH VOICE EORCTIONS MUSIC BY MICROPHONE. 3.MICROPHONE ONLY (RA. RADIO: I. RADIO PROGRAMS. 2. RADIO PROGRAMS MIXED WITH VOICE OR MUSIC BY MICROPHONE. 4 RECORDING 1. CUTTING RECORDS OF RADIO PROGRAMS. 2. CUTTING RECORDS OF RADIO PROGRAMS WITH VOICE OR MUSIC MIXED IN THROUGH MICROPHONE. or POWER -BASS CONTROL SPEECH (PUSH BUTTONS. BASS 3 4 5 6 FULL MAGIC EYE FULL TREBLE TONE CONTROL SOFT w T1 SPEAKER SWITCHOFF LOUD SOFT LOUD le 3 4 C A ELECTRic TUNING VOLUME /