WhitakerAudio JC Whitaker 20 W Stereo Integrated Audio Amplifier, Руководство пользователя

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5.5.4 Install Printed Wiring Boards
The following steps require patience. Do not force the boards and tube sockets into position, but
rather work them in carefully and slowly.
– Locate the preamplifier PWB assembly. Remove the mounting screws in the standoffs at
the four corners of the PWB and the three inner positions (if present). Set these in a
convenient place.
– Carefully place the preamplifier in position from the underside of the chassis. Observe the
match between the holes on the side of the chassis and the PWB standoffs. All should
align. If one or more standoffs do not properly align with the mounting holes on the
chassis, loosen the standoffs and try again.
– Install the seven 4-40 x 1/4-inch mounting screws from the side of the chassis to the
standoffs on the preamplifier circuit board. Do not tighten the screws until all screws have
been threaded.
– Locate the Amplifier PWB #1 (right) assembly. Remove the screws that secure the sockets
to the standoffs, and remove the screws in the standoffs at the four corners of the PWB (if
present). Set these in a convenient place.
– Check the heater wiring on the foil side of the board. Position so the wiring will rest
against the chassis when secured in place.
– Carefully place the right channel amplifier PWB in position from the underside of the
chassis.
– Install the six 4-40 x 3/8-inch mounting screws from the top of the chassis to the socket
standoffs on the circuit board. Some adjustment may be needed for the sockets to achieve
proper alignment. After the sockets are in position, install the four screws for the four
standoffs at the corners of the PWB. Do not tighten the screws until all screws have been
threaded and the sockets properly extend through the chassis cutouts so they are flush with
the top of the chassis.