Emerson-Radio-and-Phonograph-Corp-120324 电路原理图.pdf

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1、VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION EMERSON RADIO A PHONOGRAPH CORPORATION THIS ANTENNA CIRCUIT USED ON SOME RECEIVERS 0.62V !77T i rr L2.T1.T2.T3 BASE DIA6RAM if? I50K L-1 -PARTI 70011 C-1 -PART MODEL 849 CHASSIS 120324 NOTE: * COMPONENT MOUNTED ON ETCHEO WIRED BOARD * 6

2、90181 * COMPONENT MOUNTEO ON ETCHEO WIRED BOARD * 630179 JlSK 220 + 9 VOLTS NOTES: IF ONE OF THESE TRANSISTORSCOS OR 06) BECOMES DEFECTIVE REPLACE BOTH OF THEM WITH A ICW MATCHED PAIR. jr SW I BATTERY -=- VOLTS RESISTANCE READINGS (TURN SET IPFF* THEN REMOVE ALL TRANSISTORS BEFORE TAKING RESISTANCE

3、READINGS) RESISTANCE REA0IN6S SHOWN ABOVE IN OHMS UNLESS OTHERWISE SPECIFIED. Wait approx. 1 minuto till motor settles. ENERGIZER EVEREADY * 2260R EQUIV. I 9 Tl 1 IC5m SYMBOL TERMINAL B TERMINAL C TERMINAL E Q-l I70K *1 IK 1500 Q-2 4.5K *I3K 330 Q-3 2.2K *11K IK C 20 0-4 I8K 600 *I3K . Cl9- 0-5 *I2K

4、 40 IIK Q-6 *I2K 40 i 1 IK fl LZ T1 . 0ElsSi IqT az -* C7 fl a EHZ2SK AL IGNMENT, TRANSISTOR AND BATTERY LOCATION DIAGRAM ALIGNMENT INSTRUCTIONS ValuiM control should bo at maximum; output of signal generator should bo no higher than necessary to obtain an out put reading with e 30% audio modulated

5、R.F. Use an Insulated alignment screwdriver for adjusting. DUMMY ANTENNA SIGNAL GENERATOR COUPLING SIGNAL GENERATOR FREQUENCY RADIO DIAL SETTING OUTPUT METER ADJUST REMARKS High side to judo tionof L-1 & C-2, Low side to chassis. 4SS KC. Toning coo- deuser fully open. Across oics coil. T2, T3 and Tl

6、 Adjust for maximum output starting with T3. Use s loop set per pendicular and about 20* from center of bar loop ant. in set. 1640 KC. Tuning con denser fully open. Across voice coil C-20 (osc. trimmer) Fashion loop of several turns of wire and rediets signal into bar loop of re ceiver. Adjust for m

7、sxi- mum output. 1400 KC. Tune fer maximum output. Across voice coil. j.C-19 (Ant. trimmer) Adjust fer maximum output. 600 KC. Tuning con denser sot for 600 KC. M 111 Oec. slug in L-2 Rock ths variable cond. each side of 600 KC while adj. osc. slug for msidmum response. 1640 KC. i Tuning con denser fully open. p C-20 Osc. trimmer If readjustment is neces sary repeat steps 2 to 4 until no further improve ment is noted. 28 收音机爱 好者资料库 RadioFans.CN