Philco-Radio-and-Television-Corp-E-740 电路原理图.pdf

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1、96 收音机爱 好者资料库 RadioFans.CN VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION PHILCO Models E-740, E-742, E-810, E-812, E-814, and E-816 (Continued from the preceding page at left) JUMPERS SOLID JUMPERS WITHOUT PU.OT LAMP M 1 fs*. I?) 4 .?- r, SWITCH NOT USED ON CLOCK MODEL I2AV6 -OET ,

2、AVC, 1ST AUDIO Printed Panel Component Layout Models E-740, E-808, E-810, E-812, E-814 and E-816 frequency Range540 KC to 1620 KC. Intermediate Frequency455 KC. Audio Output.9 watt. Power Consumption30 watts. Operating VoltageE-740 and E-742, 105 to 120 volts, 60 cycles; E-808, E-810, E-812, E-814,

3、and E-816, 105 to 120 volts, AC-DC. AerialHigh Impedance loop mounted on inside of back. ALIGNMENT PROCEDURE Radio Controls Set volume control to maximum. Set tuning control as indicated in chart. Output Meter Connect across voice coil terminals. Signal Generator Connect generator and set fre quency

4、 as indicated in chart. Use modulated output, 30%. Output Level During alignment, adjust signal-gen erator output to hold output-meter reading below .5 volts. S0C5 3SW4 AUDIO RECT OUTPUT Printed Panel Component Layout Model E-742 SPEAKER PHASING (Model E-816 Only) When replacing or reconnecting the

5、two, paralleled speakers, it is possible that an out-of-phase condition may exist. This is readily apparent by weak output and serious distortion. To correct, interchange the leads to one of the speakers. CHASSIS REMOVAL (1) Remove Back: In models E-808 and E-810 there are two screws holding the bac

6、k to the cabinet. In models E-710, E-742, E-812, E-814 and E-816, spring the cabinet top to allow the back top to come back and out. Then lift (or slide upwards) the back to free back from bottom slots. Disen gage interlock. (2) Remove the drive screw which holds the volume control frame to a boss o

7、n inside of cabinet front. (3) It may be desirable or necessary to unsolder the two speaker leads to obtain full chassis freedom. ALIGNMENT CHART SIGNAL GENERATOR RADIO CONNECTION TO RADIO DIAL SETTING DIAL SETTING SPECIAL INSTRUCTIONS Ground lead to B; output lead through a .1 mf condenser to grid

8、(pin 7) of 12BE6. 455 kc. Tuning gang fully open. Adjust tuning cores, in order given, for max. output. TCI and TC3 are located on top of transformers. Radiating loop (See note below). 1620 kc. 1620 kc.* Adjust for maximum output. Same as Step 2. 1500 kc. 1500 kc. Adjust for maximum oulpul. TC4 -2nd

9、 i-f sec. TC32nd i-f pri. TC21st i-f sec. TCIIst i-f pri. Cl-Aaerial. Note.- Make up a 6-B lurrt, 6 inch diameter loop from insulated wire, connect to signal generator leads, and place near radio loop. * For proper adjustment of the oscillator trimmer, fully open the tuning gang and insert a .006 inch non-metallic shim between the heel of the rotor ond the top of the stator plates. Close the tuning gang sufficiently to hold the shim in place, and then remove the shim without disturbing the gang setting. 97 收音机爱 好者资料库 RadioFans.CN