Noblitt-Sparks-Industries-Inc-655SWT 电路原理图.pdf

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1、MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS Arvin Industries Model 655 SWT, Chassis RE-327 ALIGNMENT PROCEDURE AM Tuning range540 Kc to 1600 Kc. Intermediate Frequency455 Kc. I.F. and R.F. measurements made at 500 milli watts outputapproximately 1.27 volts on a rectifier type voltmeter connected

2、 across speaker voice coil. Aoproximately input for 500 MW output: R.F. with standard loop: at 600 Kc, 480 uv/m, at 1000 Kc, 360 uv/m; at 1400 Kc, 240 uv/m. PRELIMINARY: Output meter connection.Across speaker voice coil Output meter reading to indicam 500 MW.1.27 volts Generator Modulation.30%, 400

3、cycles Position of volume control.Fully clockwise Set band switch.To left for AM alignment, to right for SW alignment Position of Variable Generator Frequency Dummy Ant. (high) Generator Connection Generator Connection Ground Lead Adjust Trimmer In Order Shown For Max. Output Trimmer Function 455 Kc

4、 j05 mfd. Mixer Grid Floating Grnd. IJP. il Test Lood A6 Test Loop Test Loop A* MMrriTi Test Loop A7 Antenna -600 Kc Test Loop A5 Osc. Pad. Connect generator lead to a Standard Hazeltine Test Loop, Model 1150, place two feet from the set loop, or three turns of wire about six inches in diameter, pla

5、ced about one foot from the set loop. The alignment procedure should be repeated in the original order for greatest accuracy. Always keep the output from the signal generator at its lowest possible value to make the A.V.C. action of the receiver ineffective. SHORT WAVE R.F. A. Before attempting shor

6、t wave alignment, the Broadcast IF Alignment procedure must be completed. 1. Turn band switch clockwise to Short Wave position. B. Connect the Signal Generator to the antenna terminals (hank disconnected). A 50 MMF Dummy” must be used in the high-side” of the generator-lead and the generator groundl

7、ead” connects directly to the ground-terminal. 2. In aligning the short wave band some trouble may be experienced with image frequencies. The image frequency is separated from the desired frequency by a 910 Kc difference. In order to identify which signal is being picked up, use the following proced

8、ure to assure die receiver oscillator is above the incoming signal: a. With variable condenser completely open and the trimmer, A8, loose set the signal generator to 18 Me. Then gradually tighten the trimmer until a signal is heard. This is the correct frequency. Now if the variable condenser is clo

9、sed slightly, another signal will be picked up. This is the image frequency and must not be confused with the above desired frequency. This relationship must be maintained throughout the following balancing procedure. The image frequency must always be found by closing the variable a slight amount.

10、3. Set generator to 6 Me. The set must tune to maximum output slightly before variable is completely closed. 4. Set Generator to 16 Me. Rotate variable until the 16 Me signal is heard at two points near the open position of the variable. Again the desiredsignal is the one with the variable open the

11、farthest. Adjust the trimmer, A9, as for maxi mum outut. Rotate variable very slightly for a new maximum and repeak trimmer A9. Repeat this operation until no further inctease can be obtained. Part Schematic Part Schematic Numher Location Description Numher Location Description Capacitors D25844 Ll

12、Antenna loop C20067-473 CIO, 11 Capacitor, .047 mfd., 200V B22953 Antenna loop mtg. brkt. C20068-103 04 Capacitor, .01 mfd., 400V A25838 Antenna terminal board C20068-473 06, 17, A23237 Carton 18 Capacitor, .047 mfd., 400V C22963 R7 Control, volume & switch C20067403 03 Capacitor, .01 mfd., 200V A25

13、873 CPI Couplate C20065-470 C5 Capacitor, 47 mmf A19132 Dial Cord (10 for) C20065-101 C4 Capacitor, 100 mmf 19133 Dial Cord Spring (10 for) 020065-221 02 Capacitor, 200 mmf E40080 Dial crystal C23099-562 C7 Capacitor, 5600 mmf A19351 Dial light bulb A25830 05 Capacitor, electrolytic A19628-2 Dial li

14、ght socket C25834 C3A, B Capacitor, variable AC23302-5 Dial Plate Assembly A25832 0,8,9 Caacitor, Trimmer A19361 Hairpin clip (10 for) Resistors A40474 I.F. Mtg. clip (5 for) C20061-151 R9 Resistor, 150 ohm C20138-15 Line cord & plug r?nni.ini R4 Resistor, 100 ohm AC25871-1 L3 Oscillator coil B.C. 0

15、20061-102 R3 Resistor, 1000 ohm AC25843-1 L4 Oscillator coil S.W. C20223-122 R8 Resistor, 1200 ohm 2w 10% C23461-1 Pointer C20061-223 R2 Resistor, 22K ohm A19124 Snap fasteners (10 for) C20061-334 RIO Resistor, 330K ohm A20243-3 Socket, tube C20061-105 R1 Resistor, 1 megohm A20243-1 Socket, tube pla

16、in C20061-225 R5 Resistor, 2.2 megohm C25756 SPK Speaker C20061-475 R6 Resistor, 4.7 megohm A22941 Stud, flapper (10 for) C25831 Switch, band Cabinet C25859 Switch band mtg. brkt. R23228-5 Cabinet, Sea-Mist C21797-6 T1.T2 Transformer I.F. C23299 Cabinet, rear cover AC25868-1 T3 Transformer, putput A24464-5 Knob, Sea-Mist A25832 Trimmer assembly i Miscellaneou A22957-1 Tuning shaft 1 AC25843-1 L2 Antenna coil S.W. A25156 Tuning shaft brkt. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN