Service Manuals, User Guides, Schematic Diagrams or docs for : NAD Цифры 90 nad-90-sch

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2. BIAS ADJUSTMENT PROCEDURE


The proper bias adjustment is most important to assure correct performance of the amplifier. Bias
adjustment is necessary if any of the transistors are replaced in the power amplifier circuitry or the
amplifier exhibits overheating of the output transistors under normal operating condisions.


    INDICATOR                       ADJUSTMENT                              REMARKS
      -----:--.--..------------.


                                           --             .-t----------             ---
                                                                                                      -




    DC Voltmeter                  VR6O1a, b (1 Kohm)             Adjust for 0.006
                                                                               --  0.015 V across
                                                                                      -




                                                                 R624a, b (0.33 ohm) with NO SIGNAL

REMARK:     Bias can also be adjusted by using a line wattmeter. Adjust the VR6O1a and VR6O1b to
            the point at which the line wattmeter shows very slight increase.




3. ADJUSTMENT AND CHECK POINTS




                          R624b                          R624a




                   VB   601   b
                                                v H 60
7. 0027 PRE-AMP BOARD (TOP VIEW)




                                               

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