NAD T 743 Service Manual
Also see for T 743: Owner's manual
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10SPECIAL FUNCTIONFEATURE KEYS PRESS ON FRONT PANELRESET FOR AH VERSION VIDEO 6 + SOURCE UPRESET FOR C VERSION VIDEO 6 + SOURCE DOWNNTSC / PAL SELECTION VIDEO + MEMORYVFD ALL DISPLAY AUDIO 6 + TONE DEFEATAM FREQ. STEP AM/FM + FM MUTEDETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGINGT89C51RD2 (U202) main clock is at 20MHz (X202)T89C51RD2 (U201) main clock is at 20MHz (X201)UPPER - +5V supply to KEYBOARD when power upLOWER - RESET line (TCM810LENB713) whenpower upUPPER - OUTPUT ENABLE (pin 24) of EPROM(W27C02) when changing SURROUND MODESLOWER - CHIP ENABLE (pin 22) of EPROM(W27C02) when changing SURROUND MODESSCLK (pin 43 of CS49326)LRCLK (pin 42 of CS49326)MCLK (pin 30 of CS49326)NOTE: The waveforms are based on software version V1.27. |
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