Galvin-Mfg-Co（Motorola）-55B1 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION MOTOROLA Models 55B1U, 55L1U, 55LZU, 55L3U, 55L4U, 55M1U, 55M2U &55M3Uare the same as models 55B1, 55Ll 55LZ, 55L.3, 55L4. 55M1, 55MZ & 55M3 except that the U ver sions use a different power switch S-l. This switch has an additional sec

2、tion which opens the + A lead to the filament, pin 7, of the 3V4 during line power operation. MODELS CHASSIS 55B1 Brown HS-486 55L1 Black HS-470 55L2 Green HS-470 55L3 Red HS-470 55L4 Blue HS-470 55M1 Black HS-472 55M2 Brown HS-472 55M3 Ivory HS-472 DUMMY STEP ANTENNA IF ALIGNMENT ! I 1 mf generator

3、 CONNECTION RF ALIGNMENT 2. I 1 mf Grid of conv (pin 6 of 1R5) j GENERATOR FREQUENCY GANG SETTING F ully open REMARKS Grid of conv (pm 1620 Kc Fully open 6 of 1R5) 1. 2. 3 Peak for maximum. l for maximum. Radiation loop | 1400 Kc j Tune for maximum | 5 Peak for maximum. _ -v r- V X fflBot 455 KC 140

4、0 KC 31 TOP 1st IF fflBot 455 KC MODELS -55B1U 55L1U 55L2U 55L3U 55L4U 55L5U 55M1U 55M2U 55M3U 55M4U HS-508 HS-509 HS-509 HS-509 HS-509 HS-509 HS-510 HS-510 HS-510 HS-510 SI R6 R7 C7 C8 3V4 R8 1U5 T2 C3 1U4 T1 C6 C4 1R5 C2 R1 R2 L2 Cl M DET-AVC-AF Capacitors - Decimal values in MF. All others In MMF

5、 unless otherwise specified. Voltages - Measured wilh VTVM from polni indicated to ground. Where two voltage readings are shown, upper value is for battery operation & bottom value for AC operation. Tolerance 10* Input voltage on AC -117V, IF - 455 Kc Tunlng Range -535 to 1620 Kc ON-OFF sw 66 收音机爱 好者资料库 RadioFans.CN