General-Electric-Co-T245A 电路原理图.pdf

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1、VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION GENERAL ELECTRIC Models T245A, T246A, T250A, T255A, T256A, C525A BOTTOM VIEWS DETECTOR RC COUPLATE Tl Cl C2 10 470 11 r Wl 73V T1000 FV QSC. COIL-1.5V C8 UNLESS OTHERWISE NOTED! K 1,000 M *1,000,000 CAR MORE THAN I *MMF CAP LESS THAN I

2、MF VOLTAGE READING TAKEN WITH-VTVM 1. 120 VOLT AC INPUT 2. SET IN FM POSITION 3. VOLUME CONTROL AT MIN. 4 TUNING GANG SET TO 106 MC * SET M AM POSITION NOTE! 1. USED ON T2SOANO T299 ONLY. 2. USED ON T2S0, T255 AND C525 ONLY 3. USED ON T246 , T250 AND T255 ONLY 4. USED ON C325 ONLY. ELECTRICAL RATING

3、: TUNING RANGE: POWER OUTPUT: 105 - 120 Volt AC-DC 45 Watts AM 540-1600 KC FM 88-108 MC AM 455KC FM 10.7MC Undistored: 1 Watt Maximum: 1.5 Watts I TURN I TURN CHASSIS REMOVAL 1. Pull all knobs off control shafts on front of cabinet. 2. Remove two 1/4 hex-head screws from cabinet back. *1 3. Lift rig

4、ht hand side of cabinet back, disengag ing interlock, and then slide out to the right and out. 4. Remove six hex-head screws from cabinet bottom securing chassis and output transformer to cabi net. 5. Label and unsolder wires going to the speaker and pilot light bulbs. 6. Slide out chassis. 32 TURNS

5、 (Diagram continued to next page) STRINGING DIAGRAM 收音机爱 好者资料库 RadioFans.CN VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION GENERAL ELECTRIC Models T245A, T246A, T250A, T255A, T256A, C525A (Diagram and material continued from preceding page, at left) DISCRIMINATOR T7 j7Jtb (if | I LL

6、i 1 I T4 3 RD FM -i IF -=-U3T- f3/2AMV3 1 DETECTOR FM ! 48V V6 | I2 AU 6 I . LIMITER I Hi jiT! /.CpsFsS _ RS-I3I5 AM COU PLATE C44 R32 T7300 C43 ,5KT 5000 DETECTOR OIODE RS-I3I6 DETECTOR RC COU PLATE 1 IT 1 1 _ 1J FoetectorI KNOB SUPPORT BRACKET 1/2 V3 AUDIO AMP 19 HV 8 2 MEG L 01 C23 ftl. R24 RI5 S

7、 |$ KX)0mEG. V5 C46-L Bluei 50.HK6 4700 T6 GREEN *ii jrT“ J I, I R37 2200 * 11 Xa AA- . C49 S*_J0! 02 CMTTOtffigjf kii AM- FM-AFC SWITCH IN AM POS. 106- 120 V AC OR OC 4 RECTIFIER -MV r-VvSr- 1 W-ll_AAA/l RIOI 2? bfi_|Ufi00j JjHS ,-OOK. 60HK6 12 BE6 12 BA 6 12 WB JN 8 -r-*C20A 27K RIO2 | CLOCK MOTOR

8、-SWITCH ANO OIAL LIGHT DIAL LIGHTS 1 I NE2V FM OSCILLATOR COIL The FM oscillator coil, L3, may require adjust ment if components, other than tubes, are changed in the FM oscillator-mixer section. Check the band end frequencies. If the set tunes through 108 and 88 MC do not touch the coil. If the osc

9、illator fre quency is low, adjust L3 by spreading the turns slightly. (This raises the dial reading.) If the oscillator frequency is high adjust L3 by squeezing the turns together slightly. (This lowers the dial reading.) NOTE: A small change in the space between any 2 turns of L3 shifts the frequen

10、cy approximately 1 MC. PILOT LIGHTS NOTE: Radio model C-525 uses a type NE-2V bulb for band indication and dial lighting. A type NE-2H bulb is used for the clock face lighting. Since the NE-2H requires a higher firing voltage.it should never be substituted for the NE-2V bulb, since there is no assurance that the former will light on DC. Also, the NE-2V bulb cannot be used in series with the 27K resistor (R102) as too much voltage would be placed across the bulb, severely limiting its life. 43 收音机爱 好者资料库 RadioFans.CN