WhitakerAudio JC Whitaker 20 W Stereo Integrated Audio Amplifier, Manual

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20 W Stereo Integrated Audio Amplifier
– Install D102 – Zener, 28 V, 5 W . Solder in place, leaving about 1/4-inch clearance above
the board. Observe proper polarity.
– Install Q101, Q104 – 2N2925 (NTE199) transistor . 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 Q102, Q103, Q105, Q106, Q107, Q108, Q109, Q110, Q111*, Q112* – 2N2924
(NTE85) transistor . 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.
Clean the soldering iron tip.
– Mount the two 2-terminal Molex contact headers at the CONN100 and CONN101
positions. Solder in place. It may be necessary to hold the header in place from the
component side of the board until the first terminal is soldered.
– Mount the two 4-terminal Molex contact headers at the CONN102 and CONN103
positions. Solder in place. It may be necessary to hold the header in place from the
component side of the board until the first terminal is soldered.
– Mount the two 4-terminal Molex contact headers at the CONN106 and CONN107
positions on the daughter board PWB. Solder in place. It may be necessary to hold the
header in place from the component side of the board until the first terminal is soldered.
– Mount the two 12-terminal Molex contact headers at the CONN104 and CONN105
positions. Solder in place. It may be necessary to hold the header in place from the
component side of the board until the first terminal is soldered.
Examine the fuse holder. Some devices have a small plastic pin protruding from the mounting
side. This pin must be clipped off or the holder will not mount flat against the PWB.
– Install the fuse holder using the #4 hardware provided. Use short bare connecting wires
from the terminals to the pads on the PWB. Solder in place. Tighten the set screw (do not
over-tighten).