Nad 90 Service Manual
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Extracted text from Nad 90 Service Manual (Ocr-read)
Page 2
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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.
ADJUSTMENT : REMARKS
. INDICATOR
_, Adjust for 0.006 - 0.015 V across
DCVoltmeter : VRBOla,b(lKohm)
l. __- . _ .-._____-, a- -_
REMARK; Bias can also be adjusted by using a line wattmeter. Adjust the VRBOla and VRGOlb to
the point at which the line wattmeter shows very slight increase.
3. ADJUSTMENT AND CHECK POINTS
R624b R6243
vnsmb 60'
R5248, b (0.33 ohm) with NO SIGNAL 1