Admiral-RC7F4F-87AN 电路原理图.pdf

MODEL IDENTIFICATION CHART MODEL FINISH CHASSIS YG1571 Walnut RC7F5M-71AN or RC7W5Q-71AN or RC7W5Q-87AN 22C5A YG8001 Walnut RC7F4E-70AN *20C5 YG8002 YG8001M Walnut RC7W4N-94AN or RC7W4N-70AN YG8002M mu YG8011 Walnut RC7F4E-70AN 22 C5 YG8012 YG8025 Maple YG8031 Walnut RC7F4F-87AN or RC7F4F-71 AN YG8045 YG8051 V/alnut YG8061 Walnut YG8075 Maple YG8011M RC7W4N-94AN or RC7W4N-70AN 22C5 YG8012M Mahogany YG8025M Maple RC7W4N-70AN or RC7W4N-86AN YG8031M Walnut RC7W4P-87AN or RC7W4P-71 AN YG8045M Maple YG8051M YG8061M Walnut YG8075M Maple Radio Information for the Fallowing Stereo Theater Models Walnut RC7F4F-71 AN or RC7F4F-87AN 22C5 SMG3002 mssssm SMG3701 Walnut RC7W4P-71 AN or RC7W4P-87AN 22C5A SMG3705 Maple SMG3711 Walnut SRG2201 Walnut RC7W4P-71 AN or RC7W4P-87AN SMG2201 Walnut 22C5A Maple *FMAM, no provisions for FM Stereo GENERAL Model YG1571 is a table or wall mount unit, while the others are console models of walnut, mahogany or maple finish. An 11 turntable, 4-speed automatic phonograph with a complete system shut-off is used in each model. The various chassis are completely transistorized and are in one unit. The chassis are basically identical except that the 20C5 and 20C5A chassis do not have FM stereo circuits. No provisions are available for adding this service to the 20C5 and 20C5A chassis. The 22C5 and 22C5A chassis include the necessary circuitry for FM stereo. The FM and AM, RF and IF sections are all on one precision wired board. FM Stereo and stereo audio circuits are on a sec ond precision wired board. The FM circuit consists of RF, mixer, oscillator, three IF and a ratio detector stage. The AM consists of an auto-dyne converter, two IF and a diode detector stage. The FM stereo section consists of a 19KC amplifier, 38KC doubler, indicator control stage, and four diodes for FM Stereo detection. Six transistors are used for each stereo audio amplifier section. Attenuator type bass and treble controls along with loudness and balance controls are part of each stereo amplifier. The last three stages are direct coupled for both AC and DC current. Negative feedback is provided from the output to the base of the predriver. The output circuit is complimen tary symmetry type. Chassis 22C5,A, 20C5.A Circuit diagram on pages 8 and 9; other service material on page 10. SPEAKER WIRING SCHEMATICS SPEAKER WIRING FOR G8031 1c ; 1 M If io ii ,L L?_?_ *LI CR1 I , CR2 &C22 k AFC 4 .ZEKER Jc) Tsoo 9J0H-1J . 13631-3 i_ 15V LI6 L7 I C2I 5815 5814 Jrw1 AM R0D|4=.O2 635 * $62K R20 5R29 <5P* *1 C45 *250 _L15 5cK * AM BET.-, CR5 I = to 9 收音机爱 好者资料库 RadioFans.CN