Galvin-Mfg-Co（Motorola）-556 电路原理图.pdf

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1、Z2Mg_zl_Q|T-OFTiljEED 1956 RADI SERVICING INFORMATION RADIO TYPE - Universal automotive type superheterodyne receiver designed for underdash mounting. Receiver may be mounted in-dash with an AK-111A trim plate. This model contains an internal speaker. MODEL 556 TUNING RANGE - 540 to 1600 Kc IF - 455

2、 Kc ALIGNMENT TO SIGNAL GENERATOR PLUG TO FIT RECEIVER ANTENNA RECEPTACLE J_ TO RECEIVER CZ-ANTENNA RECEPTACLE j 30|mMF. TSZ I METAL SHIELO CAN I_JT_ I MUST BE ATTACHED TO PLUG DUMMY ANTENNA i_JT_I MUST BE ATTACHED TO PLUG See the next page, adjacent at right, for location of alignment adjustments.

3、Connect an output meter across the speaker voice coil. Set tone control to high and volume to maximum. Attenuate genera tor output to maintain 1. 79 volts on output meter at all times to prevent overloading the receiver. GENERATOR STEP CONNECTION IF ALIGNMENT 1. 6BE6 grid (pin 7) through . 1 mf ca p

4、acitor & chassis RF ALIGNMENT 2. lAnt recept through I dummy (see Fig.) GENERATOR FREQUENCY (400 cycle mod) TUNER SET TO Hi end stop Hi end stop 1, 2, 3 & 4 5, 6 & 7 REMARKS Peak for maximum Peak for maximum NOTE: Do not perform steps 3, 4, 5 & 6 unless tuner has been tampered with or components hav

5、e been replaced. Remove escutcheon to expose core screws. Before proceeding with step 3, back tuning cores 1 out of coils to eliminate their effect on trimmer adjustments. 3. I Ant recept through I 1610 Kc I Hi end stop I 5, 6 fc 7 I Peak for maximum I dummy (see Fig.) I I II 1610 Kc Hi end stop 5,

6、6 & 7 Peak for maximum 1180 Kc 19/64 from hi 8, 9 k 10 Peak for maximum using alignment end stop tool, Motorola Part No. 66A76278 1610 Kc Hi end stop 5, 6 & 7 Peak for maximum Repeat steps 4 and 5 until no further increase, then cement tuning cores in place. ANTENNA TRIMMER 7. I Weak station around 1400 Kc M lOOl CT - * . Ml- n With radio installed in car and an tenna fully extended, peak antenna trimmer for maximum. Wizen _j/f poc VOLTAMS-KASUKO FROM POST NMHCATFO 10 CHASSIS VITH A VTVH HO SKHAl ttfUt 10% t*U! VOLTACC AT SWITCH TV 86 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN