Galvin-Mfg-Co（Motorola）-C2B 电路原理图.pdf

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1、VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION MOTOROLA MODELS A2G, N, P, W C1N, W C2B, P, W C3G.S.W C3G-1, S-l. W-l CHASSIS HS-745 HS-749 HS-749 HS-750 HS-750 ALIGNMENT POINTS AND PARTS LOCATIONS TO REMOVE CHASSIS FROM CABINET 1- Remove back - 2 screws hold It in place. 2. Pull off

2、 volume and tuning knobs (place string under knob). 3. Remove screw from cabinet front and remove chassis. 4. To free chassis, unsolder appropriate leads. TO REMOVE CLOCK CRYSTAL (Models Cl, C2,C3 Series) 1. Pull off clock knob (or knobs). Insert a screwdriver between the cabinet and bottom edge of

3、the clock crystal (near 6 oclock on clock face) to release catch, then lift out crystal. TO REMOVE CLOCK FROM, CABINET (Models Cl, C2, C3) 1. Remove 2 cabinet back mounting screws and remove cabinet back. 2. Unsolder 3 chassis leads connected to clock. 3. From rear, remove 4 clock mounting spring cl

4、ips. 4. Pull offLazalarm button from cabinet (Model C3 only). 5. Removeclockcrystal (see To Remove Clock Crystal*); remove clock from front of cabinet. NOTE; On Model C3 Series, install clock into cabinet before replacing Lazalarm button. Models C4B, P, S, Chassis HS-752, |is practically the same el

5、ectrically,| I but includes dimmer and appliance I ! outlet. ALIGNMENT Use an isolation transformer between the power line and the receiver. If not available, connect low side of generator to B- through a . 1 mf capacitor. Connect a low range output meter across speaker voice coil and set volume con

6、trol 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 ALIGNMENT 1. Grid of conv (pin 7, I2BE6) thru . I mf &B- 455 Kc Fully open 1, 2, 3 & 4 Adjust for ma

7、ximum. RF ALIGNMENT 2. Grid of conv (pin 7, 12BE6) thru . 1 mf &B 1620 Kc Fully open 5 Adjust for maximum CAPACITORS - Decimal values sn Mf ell others in MMf unless otherwise specified. VOLTAGES - Measured from point indicated to B with a VTVM. +10*, noignal input with 120V WuAC in TUNING RANGE - 535 KC to 1670 KC. IF 455 KC. PLATED CHASSIS BOARD WIRING LEGEND . V JT WC A*FILAMENT 1 2 3 4 5 6 7 El CONN 1A8 VIMEP mow nUHTtS HDD ON-OFF SWITCH AC4/S53 94 收音机爱 好者资料库 RadioFans.CN