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5ymservice manual download site
5ymservice manual download site
In amplifier circuits, l, r, two channels are usually composed of identical circuits. When one of the channel appears "failed" and men and a channel properly, if measuring method of DC resistance of two-channel virtual points. By comparison are often able to find "fault" element lies. Road measuring two-channel DC resistance of each resistor and capacitor both ends and compared, found no significant irregularities.5ymservice manual download site
5ymservice manual download site
After the stage power amplifier using DC coupling mode, as long as one appears "failed" will result in change of the DC voltage at the output. Suppose output decreases potential for some reason (increase in the negative direction). Changes in the voltage of Q2, Q4, by negative feedback resistors R18 b voltage decreases. C current of Q2 decreases, 04 c current increases. Due to Ol and 02,Q3 form a differential amplifier circuit and Q4 respectively. Q2 current decreased causes Ql Ql current increases → c voltage drop voltage rise → → Q5 c 08, 09 turn-on level → midpoint voltage at the output recovery I at the same time. Q4 Q3 current caused by current increase will also reduce the voltage drop → e → Q3 Q6 c voltage rise → Q10, Ql l b voltage rise → midpoint voltage at the output to rise. Conversely, if for some reason the output voltage rises, the above changes the process is reversed. Under the combined effect of these network circuits, the DC zero potential outputs are highly stable.5ymservice manual download site
5ymservice manual download site
Voltage measurement method is then used for repairs, first measuring the amplifier supply voltage ± 47V, respectively (normal). B Q2 04 measured DC voltage for -4.1V, show that output negative voltage difference circuit with feedback to the feedback input. Blue Ql and Q3, input b measuring DC voltage measured for -0.02Vo further Ql c voltage -0.8V,Q2 voltage +43.4V and e +47V, e c voltage voltage. -0.9V,R7, R8 thru -0.9V.5ymservice manual download site
5ymservice manual download site
According to the survey results. Analysis of R6, R8, no pressure drop at both ends. Q2 deadline, R5, R7, a voltage drop at both ends. Note Q1 current pass.
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