WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Руководство пользователя, Страница: 75 / 194

75
20 W Stereo Audio Amplifier
– Install R303 – 270
Ω
, 2 W . Solder in place, leaving about 1/2-inch clearance above the
board.
– Install R304 – 1 k
Ω
, 0.5 W . Solder in place.
– Install R306 – 22 k
Ω
, 0.5 W . Solder in place.
– Install R307 – 1 m
Ω
, 0.5 W . Solder in place.
– Install C301 – 82 µF, 500 V electrolytic . Bend the pins to provide a good mechanical and
electrical connection. Solder in place, observing proper polarity. The positive terminal of
the device connects to the square pad on the PWB. This same convention is used for all
other electrolytic capacitors on the board.
– Install C302, C303, C304 – 0.01 µF ceramic, 1000 V . Solder in place.
– Install C305 – 0.22 µF, 400 V . Solder in place.
– Install C306 – 1000 µF, 50 V electrolytic, radial . Solder in place, observing proper
polarity.
Clean the soldering iron tip.
– Install D301, D302 – Zener, 200 V, 5 W . Solder in place, leaving about 1/4-inch
clearance above the board. Observe proper polarity. Note that the cathode (banded) end
goes to the square pad on the PWB. This convention is used for all diodes on the
preamplifier board.
– Install D303 – Diode, 1 A, 600 V . Solder in place, leaving about 1/4-inch clearance above
the board. Observe proper polarity.
– Install Q301 – NTE5410 SCR . Install the push-on heatsink and then solder in place, being
careful to properly orient the device. Use the legend printed on the PWB and the legend
provided on the packaging as a guide.
– Install VR301 – 130 V ac Varistor . Solder in place.
– Install the socket for relay RYL301. Be certain to properly orient the socket. Solder in
place.
– Install the two fuse holders. Guide the connection pins through the PWB and solder.