Philco-Radio-and-Television-Corp-53-956 电路原理图.pdf

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1、MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS PHILCO RADIO MODEL 53-956 1| *1 H .2 a | O Eg J2 g o (FM alignment information reprinted on page 87) “ SS s J | g, g .5 E1 5? S5 * Mi-Ill* pWWV-1- 58 * r T ic * n. 3 52 * _IC_ X)66 l -,V)AI siss io Sllit *S* 0) - . . * S. csss C A A I Dl H H I I I iHOS

2、TTcO uuuu HHHH to 0) IA D o 1 s PC c O r3 H O C . * 3 - WaS 2 s -c W 5 O .9 t d 5 = 2 _3 a c/3 E 11 *Hh52 -WWW”|I ifl El=5 w filni. i- Rii ill s 1 Iflssf 2 I iliiii O -sel 8 1 jj 1 S 1- J *| *8 s sa*ul * Ml, * Ms 1 is 3 I i .sills l 1 = s V to 0 6 -2 -* = m s s 5 |2 .0 5 =*- a i (N 4? rv e 3 PC D I

3、JK i *3 fo-3*+ O 3 3 o o i* s *3 O .2 c a a IA IA 0) M 0) 8- o O C S O 0:5 connect horizontal input to horizontal sweep output of sweep generator. (Oscilloscope is used for steps I and 2.) 12AT7 TC!. - OSC-MIXER SWEEP GENERATORUse FM r-f sweep signal generator. Connect output lead as given in chart.

4、 Set frequency and sweep width as indicated in chart. OUTPUT METERConnect across voice-coil terminals. LAI. I ri- 12BA6 0 12AU6 tSTIFAMPL TC7 2ND IF AMPl 23 TCI , I2AU6 RF AMPL Make AM alignment first STEPS 1 AND 2 .STEPS 3,4, AND5 Characteristic Curve of FM Detector CONNECTION TO RADIO DIAL SETTING

5、 Ground lead to chassis. Output lead through a ,01-f, condenser to con trol grid (pin 1) of 12AU6 2nd i-f amplifier. 9.1 me. (75 kc. devia tion). Ground lead to chassis. Output lead through a .01-A*f. condenser to FM tuning gang stator lug, junction of Cl and pin 4 of L2. Same as step 1. Ground lead

6、 to lug 3 of TBl. Out put lead to lug 2 of TBl. See note 1 below. 108.5 me. Same as step 3. 88 me. Same as step 3. 105 me. Same as step 3. 105 me. Same as step 3. 92 me. DIAL SETTING Same as step 1. 108.5 me. (1st index mark from right). from left). Same as step 3. RADIO SPECIAL INSTRUCTIONS ADJUST

7、Balance and adjust detector for maxi mum indication on scope, as shown in figure 2. TC8detector sec. i TC7detector pri. Adjust for maximum indication on scope, as shown in figure 2. TC6-FM 2nd i-f TC5FM 2nd i-f pri. TC2-FM 1st i-f TC1-FM 1st i-f pri. Adjust for maximum indication on output meter. C1

8、8-FM osc. Adjust for maximum indication on output meter. See note 2 below. L5FM osc. Adjust for maximum indication on output meter while rocking tuning condenser. C1B-FM r-f. Adjust for maximum indication on output meter. C4FM aerial. Adjust for maximum indication on output meter. See note 3 below.

9、L2-FM r-f coil. step 8, below. Adjust for maximum indication on output meter. TC11-FM aerial. NOTE I: For accurate results, the signal-generator output impedance must be 300 ohms, to match the input impedance of TBl. If the generator impedance is less than 300 ohms, a resistor of the proper value ma

10、y be used in series with the output lead to make the impedance correct. For example, if the output impedance is 150 ohms, place a 150-ohm resistor in series with the output lead. NOTE 2: If oscillator does not tune as low as 88 me., compress the turns on the oscillator coil. If oscillator tunes too

11、low, spread the turns slightly. After coil is adjusted, repeat step 3. NOTE 3: Check resonance of coil L2 by inserting end of a tuning wand, such as Philco Part No. 56-6100, in the coil. If output increases when iron end is placed in coil, compress turns slightly. If output increases when brass end is placed in coil, spread the turns. If output decreases when either end is placed in coil, no adjustment is necessary. After the coil is adjusted, readjust C1B and repeat steps 3 through 8 until no further improvement is obtained. PV m 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN