NAD T 751 Service Manual
Also see for T 751: Owner's manualSpecification sheetService manual
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Contents
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3-2ELECTRICAL TROUBLESHOOTING GUIDENo 5V_Dor 5V_A .No 5.2VA.Is 5.2VA section working?(Is the POWER CTL atPin6 High/low?)Is oscillation present at theBase of Q108?Replace Q108.Check D109, C123, R125,R124.Replace R102.Replace BD101.(Bridge rectifier)Is R102(R104) normal?Is about AC 100V app;ied toIC101 Pin 3.Check IC101.Is 5.2V applied to IC102Pin 1?Is there a DC voltage at the(+) terminal of BD101?Check R127, 128.(SHUTDOWN CKT)1. Power(SMPS) CircuitNo FLDIs 5.2VA section working?Replace SMPS trans(T101).Replace the inferiorcomponents.Are D109, L103 open?NONONONONONOYESYES YESYESYESYESYESA. B.NONO |
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