Galvin-Mfg-Co（Motorola）-SK38B 电路原理图.pdf

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1、VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION MOTOROLA RIGHT CHANNEL PHONO INPUT VIA 1/2 - X2AX7 1ST AF AMP RIGHT CHAN j gDaci. LEFT CHANNEL PHONO INPUT V1B 1/2 - 12AX7 1ST AF AMP LEFT CHAN 61146V IF- I V2A 1/2 - 12AX7 TONE AMP RlfHTCHAN MODELS SK36M SK37CW SK38B CHASSIS HS-767, HS

2、-781 HS-767, HS-781 HS-767, HS-781 CirW CAPACITORS - Decimal values In MF, all others in MMF T KX0 * * unless otherwise specified. I *: VOLTAGES - Taken wHh a VTVM Irom point Indicated to I 22: chassis. 10%. No signal In, pre-amp Hj connected to power amp. RIGHT CHANNEL - OUTPUT - LEFT CHANNEL OUTPU

3、T SK j?17 56K Tj CW PRE-AMP HS-781 SCHEMATIC DIAGRAM ,05? R20 4.7K C13_ + MX PRE-AMP POWER PLUG (PIN TIEN) |l/2-I2AX7RIGHT AF AMP Cl ,.001 C4,/390_ J if 1/2-12AX7 BASS Af AMP 1 : :S R5 1.5M r i SI1 LEFT CHAN SPKRS RECORD CHANGER WIRING VI V2 V3 IV4 AVI O U2-12AX71EFT AF AMP! +C15B +JC15C +|C150 i P*

4、F S|S il 1-1 RECTIFIER PWR-AMP HS-767 SCHEMATIC DIAGRAM TYPE - Console, three channel stereophonic phonographs containing four-speed record changers and multi ple speaker systems. The models differ from each other primarily in cabinet design. PRE-AMP CHASSIS REMOVAL 1. Remove control knobs, cabinet

5、back cover and sounding board located inside cabinet at base of record changer; board is held in place by 4 machine screws. 2. Disconnect all pre-amp connecting leads and remove pre-amp; pre-amp is held in place by 2 hex nuts. power amp chassis removal Remove cabinet back cover, disconnect all power

6、 amp chassis connecting leads, remove 6 power amp mounting machine screws and remove power amp chassis. RECORD CHANGER REMOVAL 1. Turn the 2 changer mounting screws clockwise down flush with the changer base. 2. Remove cabinet back cover, then disconnect all cables to record changer. 3. Turn the mou

7、nting clips, located at the ends of the mounting screws so they are parallel with the mounting screws, then lift changer out of cabinet. SPEAKER PHASING the SPEAKERS MUST BE IN PHASE OR A LOSS OF MID-RANGE FREQUENCIES WILL RESULT. Phasing can be checked by momentarily connecting a 1-1/2 volt flash l

8、ight battery in parallel with the speaker connecting leads (temporarily short across capacitors in cross-over net works) and noting if all speaker cones move in the same di rection (with the same polarity reference voltage applied to all three speaker systems). If they do not, reverse the connections of the speaker whose cone Is out of phase. 收音机爱 好者资料库 RadioFans.CN