Galvin-Mfg-Co（Motorola）-52CW4 电路原理图.pdf

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1、 IDENTIFICATION (.002 - MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS Motorola MODELS 52CWI 52CW2 52CW3 52CW4 CHASSIS HS-329 rv i o* S3 i g *-* i o 2 C B 1 O. rt o - = Sz - O o z .a aH v s = x w /r * C U 5 H Li O 2 3 3 * 3 U 3 1ft -fls 8 O g N I * I h . v-/ K $OK 5 zo * 4UJ a. - su, -* a #* nCL II

2、I Z o Sen R-./a ui - Zui OH S# s5o | uj zo -fth1 O a Jj J . OJ 0.00 4 2 4* UJ = “ i 3 4/ c a- 43 A C H 0 S B 57 Alignment information continued on the next page 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS MOTOROLA, INC. ALIGNMENT Chassis HS-329, continued. NOTE: It is rec

3、ommended that an isolation transformer be placed between the power line and the receiver to avoid hum and electrical shocks* If an isolation transformer is not available, connect the low side of the signal generator to B- through a 1 mf capacitor* 1. Connect a low range output meter across the speak

4、er voice coil. 2. Connect the low side of the signal generator to B 3. Set the signal generator for 400 cycle, 30% modulation. 4. Turn the receiver volume control to maximum. 5. Use a small fibre screwdriver for aligning the IF and diode transformers. 6. As stages are brought into alignment, reduce

5、the signal generator output to a level which produces less than . 40 volts (. 05 watt) across the voice coil to avoid overloading the receiver. 7. See Figure 4 for adjustment locations and the following chart for procedure* STEP DUMMY ANTENNA GENERATOR CONNECTION GENERATOR FREOUENCY GANG SETTING ADJ

6、UST- REMARKS *3 r GNMENT i. RF AL . 1 mf IGNMENT Grid of conv. (pin 7, 12BE6) 455 Kc Fully open 1, 2, 3 & 4 (IF cores) Adjust for maximum. 2. . 1 mf Grid of conv. (pin 7, 12BE6) 1620 Kc Fully open 5(Osc) Adjust for maximum. 3. - Radiation loop* 1400 Kc Tune for max 6 (Ant) Adjust for maximum. Connec

7、t generator output across .5 diameter, 5 turn loop and couple inductively to receiver loop. Keep generator loop Perpendicular to axis of and at least 12 inches from receiver iron core loop* TO REMOVE CHASSIS FOR SERVICE 1. Pull off the two radio control knobs. 2* Remove the four screws from the back

8、 cover. 3. Pull off the back cover. 4. Disconnect the speaker leads. 5. Disconnect the three leads to the clock. 35W4_ RECT 50C5 PWR AMP ._ A_ ml 12AT6 f DET-AVC-AF SEC 455 KC T2 DIODEI SEC 455 KC 12BD6 IF AMP 12BE6 C0N TO REMOVE CLOCK FROM CABINET 1. Remove the radio chassis as above. 2. Pull off t

9、he three clock control knobs. 3. Remove the clock dial scale. 4. Remove the three speed nuts which fasten the clock to the cabinet. 5. Remove the clock carefully, to prevent damage to its hands or face* TO REPLACE CLOCK DIAL BACKGROUND 1. Remove the clock from the cabinet as above, 2. Carefully pull

10、 off the four hands. 3. Remove the clock dial background. 4* Install new background. 5. Turn the radio control shaft (B) to AUTO position. 6. Slowly rotate the automatic time set shat (C) clock- FIGURE 4. TUBE AND ALIGNMENT LOCATIONS wise until a click is heard, indicating that the switch con tacts have closed. Do not overshoot this point. 7. Reassemble all four hands in the 12 oclock position, 8. Check the operation of the clock to be sure the radio turns on at the timtf indicated on the automatic time dial 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN