Galvin-Mfg-Co（Motorola）-52L3A 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN 1R5 - CONV 1R5 CONV STEP DUMMY ANTENNA GENERATOR CONNECTION GENERATOR FREOUENCY GANG SETTING REMARKS MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS MOTOROLA Chassis HS-357, Models 52L1A, 52L2A, 52L3A, continued. C4 R1 C13 R5 R17 T2 C5 R16 C6 R11 El C11 R12 C9 3S4 PWR AMP 1U5

2、 DET-AVC-AF ALIGNMENT ! Connect a low range output meter across the speaker _ voice coil. JL JT 1 2. Connect the low side of the signal generator to B-. OSC CORE IF SEC 600 KC 455 KC 3. Set the signal generator for 400 cycle. 30% modulation. 4. Turn the receiver volume control to maximum. 5. Move th

3、e battery saver switch to the HI position. 6. Use a small fibre screwdriver for aligning the IF and diode transformers. f- 1 fVj r r OSC TRIM L“ff / 11 l , 1 -t/ / 3/ (620 KC Tl- 1- 7. Adjust the signal generator output to produce .40 volts (.05 watts) across the voice coil. As stages are aligned, r

4、educe the generator output to maintain the .40 volt level, to avoid overloading the receiver. IF PRI 455 KC / ANT TRIM / 1400 KC DIODE 455 KC Vi/ 1 IF ALIGNMENT 1. .1 mf Ant section of gang (green loop lead) 455 Kc Fully open 1, 2 & 3 (IF cores) RF ALIGNMENT 2 1 - - _ _ 3. - - - - - 4. . 1 mf Ant se

5、ction of gang (green loop lead) 1620 Kc Fully open 4 (Osc trim) 5. - Radiation loop* 1400 Kc Tune for maximum 6 (Ant trim) 6. * “ Radiation loop* 600 Kc Tune for maximum 5 (Osc core) 7. * - Radiation loop* 1620 Kc Fully open 4 (Osc trim) 8. * Radiation loop* 1400 Kc Tune for maximum 6 (Ant trim) | -

6、 Attach chassis bottom cover. “ Install batteries in chassis. Ant section of 1620 Kc Fully 4 Adjust for maximum, gang (green loop open (Osc trim) lead) Radiation loop* 1400 Kc Tune for 6 Adjust for maximum. maximum (Ant trim) Radiation loop* 600 Kc Tune for 5 Simultaneously tune gang and maximum (Os

7、c core) adjust core for maximum signal. Radiation loop* 1620 Kc Fully 4 Readjust for maximum, if j open (Osc trim) necessary. Radiation loop* 1400 Kc Tune for 6 Readjust for maximum, if maximum (Ant trim) necessary. Connect generator output across 5” diameter, 5-turn loop and couple inductively to receiver Loop. Keep loops at least 12 apart. Steps 6, 7, & 8 need not be performed unless receiver is off calibration or mistracks badly at lew frequencies. 收音机爱 好者资料库 RadioFans.CN