Galvin-Mfg-Co（Motorola）-56CJ1 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION MOTOROLA MODELS CHASSIS MODEL CHASSIS MODELS CHASSIS 56CC1 White HS-457 56CE1 Ebony HS-490 56CJ1 Ebony HS-499 56CC2 Green HS-457 56CS1 Mahogany HS-490 56CJ2 White HS-499 56CD1 Mahogany HS-457 56CS2 White HS-490 56CD2 White HS-457 56CS3

2、Red HS-490 56CD3 Pink HS-457 56CS4 Green HS-490 56CD4 Turquoise HS-457 The three groups of sets listed above are electrically similar. The clock switching unit and appliance outlet connections to 35W4 may differ somewhat. Chassis HS-499 omits R9, 27-ohm resistor. Chassis HS-490 omits R6 and C4, and

3、there is no RF trimmer adjustment. 12BE6 12BA6 12AY6 50C5 CONV IF AMP DET-AVC-AF PWR AMP 1 DUMMY STEP I ANTENNA GENERATOR CONNECTION GENERATOR FREQUENCY (400 cycle mod) GANG SETTING ADJUST REMARKS IF ALIGNMENT 1. | I mf Grid of conv. (pin 7, 12BE6) 455 Kc Fully open I, 2, 3 & 4 (IF cores) Adjust for

4、 maximum. Use insulated screwdriver. OSC ALIGNMENT 2. | . 1 mf Grid of conv. (pin 7, 12BE6) 1620 Kc Fully open 5 (Osc) Adjust for maximum. RF ALIGNMENT 3 # l Radiation loop* 1400 Kc Tune for max 6 (RF) Adjust for maximum Connect generator output across 5 diameter, 5 turn loop and couple inductively to receiver loop. Keep loops at least 12 apart. # Step 3, RF alignment is not required for Chassis HS-490. 60 收音机爱 好者资料库 RadioFans.CN