Admiral-Y865B 电路原理图.pdf

VOLUME R-21, MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION Admiral CORRECTION IN COMPONENT SYMBOLS ON THE ETCHED CIRCUIT BOARD In some chassis C3 is shown alongside the electrolytic capacitor (C13). This C3 should be deleted. C8 shown on opposite side of C13 should be read as C3. (C8 is part of couplate M3 and should therefore not show on the board.) TABLE CLOCK RADIO MODEL COLOR CHASSIS Y853C White 5B5C Y865B Melon & White 5B5B Y866B Yellow & White Both 5B5B and 5B5C chassis are very similar to Chassis 5B5, which is covered on page 5, of Vol. 20, 1960 Radio Diagrams manual, and these instructions may be used for alignment and chassis removal. The 5B5B and 5B5C chassis differ from the 5B5 chassis in the following respects: The RF input is now shunt fed to the converter to reduce the loading effect and noise pickup of the antenna. The tuning gang and oscillator coil have been re designed and also the IF amplifier bias and screen bypassing have been increased to reduce, to a minimum, any tendency toward IF regeneration. There are no electrical circuit differences be tween the 5B5B and 5B5C chassis. The 5B5B chassis is equipped with a clock having the Snooze Alarm and Sleep Switch features while the 5B5C clock does not. The etched circuit board has been changed to comply with the new circuit changes, plus a few relocations of components, etc. Rear View of Etched Circuit Board in Chassis 5B5B and 5B5C. Gray area represents etched wiring, black symbols and lines represent components and connections on opposite side. 12BE6 12BA6 12AV6 50C5 8 收音机爱 好者资料库 RadioFans.CN