WhitakerAudio AM/FM Stereo Tuner 2012, Assembly & User Manual

Page: 76 / 166

76
WhitakerAudio
5.3.4 Install Chassis-Mounted Transformers
The chassis is shipped with the power supply transformer and choke packaged separately. This is
a precaution to avoid damage during shipping due to the weight of these components. As the
transformers are installed, the chassis will become quite heavy. Use the side handles to move the
chassis. It may be useful to have a second person assist during the following steps.
In order to reach the PWB terminal posts, the lead length on the transformer wires is critical.
As typically supplied, the leads should reach their respective posts. To avoid the possible need to
extend one or more of the leads, do not trim the wires from the transformers until they are ready to
be connected to the PWB.
– Locate the chassis grommets. There is one for the 1/2-inch choke lead hole and 2 for the 3/
4-inch power transformer lead holes. Install the grommets.
– Find the two 3/4-inch standoffs set aside during assembly of the AM tuner PWB and FM
tuner PWB. There are two mounting holes within the chassis space occupied by the power
transformer. These holes will be inaccessible after the transformer is installed. Using #4
counter-sunk screws, mount the two standoffs. Tighten.
– Locate power transformer T6. Install using the #6 hardware provided, carefully guiding
the leads through the holes in the chassis. Be sure to include the grounding lug wire. Route
the grounding wire through the chassis along with the transformer leads. The filament
leads (yellow and green) should face to the rear of the chassis.
– Locate the power supply choke, L2. Install using the #6 hardware provided, carefully
guiding the leads through the hole in the chassis. Be sure to include the grounding lug
wire. Route the grounding wire through the chassis along with the choke leads.
– Locate SW3, the over-temperature sensor. This device mounts against the chassis
(underside) using the two mounting screws for T6 and L1 that are adjacent to each other at
the rear of the chassis. Remove one of the mounting screws for T6 and loosen the
corresponding mounting screw for L1. Install SW3 and tighten.
The chassis-mounted transformers have now been installed.