Yamaha-A-460-Service-Manual电路原理图.pdf

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1、 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 1 6 7 .ADJUSTMENTS 1. Idling current You will find that Adjustment will be facilitated if you When repairing the main amplifier (replacing TR105 to use the lead wires as shown in the bottom figure. 122), adjust idling current. Connect to the a. Set th

2、e VOLUME control to its lowest position. Connect to test points Vinyl wires colored voltage tester white and red b. Rotate VR109 (Lch) and VR110 (Rch) for idling current adjustment fully counterclockwise. c. Connect a voltage tester to the test points. cp (Red. Black) Plug (Red. (L ch: TP1 EEl TP2 8

3、 , R ch: TP3 EB TP4 8) d. After the power has been switched, rotate VR109 and VR 110 and set so that the voltage between test points comes to 15mV. e. Set so that the voltage between test points comes within 15 3mV about 3 or 4 minutes after the power has been switched on to enable the operation of

4、the amplifier to stabil ize. * When idling current rises abnormally and the voltage of test points is very high, in spite of rotating VR109 or VR110 counterclockwise, the set is broken. i idling current adjustment (R eh I Iidling current adjustment (L ch I 1 I TP4 _-v 1 VRll0(R) VR109(LlcoTPl :/ TP3 o TP2 I Voltage tester MAIN CIRCUIT BOARD l ,e r Adjustment item Channel Test point Adjust ment VR Rating or standard Idling current L ch TP1Ef! TP28 VR109 l53mV adjustment R ch TP3Efi TP48 VRll0 ,. J , . 24 page 23 is blank