Philco-Radio-and-Television-Corp-T-907 电路原理图.pdf

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1、VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION PH ILCO AM-FM TRANSISTOR PORTABLE MODEL T-907 REMOVAL OF FM TUNER PANEL (Material below and the next two pages) 1. Remove chassis from cabinet. See Chassis Dis assembly instructions. 2. Remove 2 magnecore antenna mounting clamps and swi

2、ng magnecore out of the way. 3. Loosen 2 FM tuner shield screws and remove shield. 4. Disconnect FM tuner leads from their points of origin. See FM tuner perma-circuit illustration. Do Not attempt to disconnect leads from the tuner panel. Bring free leads up through hole in main perma-circuit panel.

3、 5. Unsolder Tuning Gang Grounds (See FM tuner perma-circuit illustration), separate and straight en lugs. Be sure lugs are free of excess solder. 6. Unsolder Shield Grounds from rear or outside of back shield. Be sure lugs are clean and free in thfe shield holes. 7. While alternately heating the ga

4、ng terminals Cl- R-F and Cl-osc., gently pry panel out using a thin bladed tool. C4 T2 cjl O RF TRIMMER RFCOIL, RF AMP SR TUNING GANft SHIELD GROUNDS b BROWN LEAD - BASE SUPPLY TO FOIL BELO C40 BLUE LEAD EMITTER SUPPLY TO sl-SC CHASSIS DISASSEMBLY 1. Remove back by loosening back retaining screw. CA

5、UTION - Monopole antenna lead is connected; disconnect lead from antenna. 2. Remove knobs. 3. Remove nut holding band switch clamp and re move clamp. 4. Remove back mounting threaded post. 5. Remove nut at volume control end of back plate. Wt H CMD oI fts I C5 L3 02 L4 0SC TRIMMER 0SC COIL Cl FM CON

6、V. 1ST IF(PRI.) 1ST OSC. Top Composite View of FM Tuner Perma-Circuit Panel 5 1ST IF(SECJ 6. Remove nut at left end of FM R-F sub-assembly. 7. Remove nut in front of 1st I-F, T3. 8. Remove panel, dial, switch and mtg. plate as sembly. W4Q BIA * rlct * M Air IHWvW WlV V OC 309 2 C*T pm iooiafT* ft m

7、i ; fm zoe v- OTTOM J.C* view OCJll / X colop tt 7 * A I I I IM I I I IM C I 1 I I I I ooi i AM-FM FUNCTKX* SWITCH SI It AM HAL SBOC VlEWl SWITCH SeqilOHS M SCHEMA? SMOWH 116 收音机爱 好者资料库 RadioFans.CN VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION Under Panel Component Identification

8、117 Cord Stringing 收音机爱 好者资料库 RadioFans.CN VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION PHILCO Model T-907, Alignment Information, Continued from preceding pages AM ALIGNMENT PROCEDURE FM ALIGNMENT PROCEDURE Allow generator to warm up for 15 minutes Check pointer-scale alignment.

9、rherk nninto, . ,. . Chassis must be removed from cabinet. See dis- Check pointer-scale alignment. assembly instructions. Chassis must be removed from cabinet. See Depress FM push button. disassembly instructions. Connect scope across volume control toobserve Connect scope or AC meter across speaker

10、 S curve (see illustration below), voice coil to observe output. Loosely couple generator output to telescope Volume control to maximum. antenna. Use only sufficient signal for clean Check battery supply voltage, 9 volts. scope presentation Do Not Overload. _AM ALIGNMENT CHART Signal Generator Conne

11、ction To Radio Frequency Dial Setting Special Instructions Adjust To base of AM con verter, Q3, thru a .01 /ifd capacitor. 460KC 1500KC Adjust, in order given, for maximum output. T3, 1st AM I-F top & bot. T4, 2nd AM I-F, top T5, 3rd AM I-F, top Use radiating loop. 600KC 600KC Adjust for maximum out

12、put. L2, AM oac. core Radiating loop 1500KC 1500KC Adjust for maximum output. C3, AM osc. trimmer Repeat Steps 2 and 3 until no further improvement is obtained. Radiating loop 600KC 600KC Adjust for maximum output by sliding ant. coil on core. El, AM magnecore ant. Radiating loop 1500KC 1500KC Adjus

13、t for maximum output. C2, AM ant. trimmer Repeat Steps 5 and 6 until no further improvement is obtained. NOTE: For radiating loop, use a 6 t8 turn, 6-inch diameter loop made up of insulated wire. Connect to generator terminals and place about ane foot from antenna cail. FM ALIGNMENT CHART 10.7MC MARKER AT CROSSOVER X f ADJUST FOR MAX. AMPLITUDE, SYMETRICAL CURVE FM Alignment Curve prgi 23 g Chassis Alignment Points 11B 收音机爱 好者资料库 RadioFans.CN