NAD T 163, Service Manual, Page: 11 / 61

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SPECIAL FUNCTION
FEATURE A A KEYS PRESS ON FRONT PANEL
RESET FOR AH VERSION VIDEO + TONE DEFEAT
RESET FOR C VERSION VIDEO + TONE CONTROLS
NTSC / PAL SELECTION VIDEO + MEMORY
VFD ALL DISPLAY AUDIO + TAPE MONITOR
AM FREQ. STEP AM/FM + FM MUTE
COLOUR BAR GENERATOR AUDIO + DIGITAL AUDIO
(VC-version units only) (all monitor outputs will show the generated colour bar)
DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING
T89C51RD2 (U202) main clock is at 20MHz (X202)
T89C51RD2 (U201) main clock is at 20MHz (X201)
UPPER - +5V supply to KEYBOARD when power up
LOWER - RESET line (TCM810LENB713) when
power up
UPPER - OUTPUT ENABLE (pin 24) of EPROM
(W27C02) when changing SURROUND MODES
LOWER - CHIP ENABLE (pin 22) of EPROM
(W27C02) when changing SURROUND MODES
SCLK (pin 43 of CS49326)
LRCLK (pin 42 of CS49326)
MCLK (pin 30 of CS49326)
NOTE: The waveforms are based on software version V
2
.
13V
.