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1、VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION MODELS MOTOROLA CHASSIS HS-531 57CC1 Turquoise 57CC2 Pink Capacitors - Decimal values in MF. all others in MMF unless otherwise specified. Voltages Measured irom point indicated to ground with a VTVM. No signal input. Tuning Range - 535
2、 to 1620 KC, To Remove Chassis from Cabinet 1. Remove two screws which hold the cabinet back in place and remove the cabinet back. 2. From front of cabinet, pull off two control knobs and pointer. 3. From under pointer, remove one chassis screw. 4. From rear of cabinet, remove one chassis screw from
3、 volume control ear. 5. Pull off the chassis AC leads to the AC connector ter minal strip. To Remove Clock from Cabinet 1. Remove two screws which hold the cabinet back in place and remove the cabinet back. 2. Pull three knobs off front of clock. 3. From rear of cabinet, remove four screws which hol
4、d clock in place and remove clock. ADJUST FROfA BELOW ALIGNMENT Use an isolation transformer between the power line and the receiver. Connect low side of generator to B- (outer chassis edges) through a . 1 mf capacitor. Temporarily connect the speaker and AC leads. Connect a low range output meter a
5、cross the speaker voice coil and set volume control to maximum. Attenuate generator output to maintain .40 volts on output meter to prevent overloading. STEP GENERATOR CONNECTION GENERATOR FREQUENCY (400 cycle mod) GANG SETTING ADJUST REMARKS IF ALIC iNMENT i. Grid of conv (pin 7, 455 Kc Fully open
6、1. 2, 3 lc 4 Adjust for maximum. 12BE6) thru 1 mf 8i R- RF ALIGNMENT 2. Grid of conv (pin 7, 1620 Kc Fully open 5 Adjust for maximum. 12BE6) thru . 1 mf & B- 3. Radiation loop* 1400 Kc Tune for max 6 Adjust for maximum. Connect generator output across 5 diameter, 5-turn loop and couple inductively to receiver loop. Keep loops at least 12” apart._ _ 57 收音机爱 好者资料库 RadioFans.CN
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