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Assuming that your Stereo 400 is like mine, you should now be able to wiggle the heat-
sink assembly loose from the chassis. Be careful and gentle, as there are a number of
wires that hold the heat-sink assembly to the chassis. Your Stereo 400 might even have a
screw that mine didn't, as there may have been changes during production that I am not
aware of.
With a little persistence and a lot of care, you will be able to swing the bottom of the
heat-sink assembly away from the chassis. Remove the 2 screws, 2 nuts, and 2 lock
washers adjacent to the RCA jacks that hold them into the heatsink. Don't let the
lockwashers fall into the chassis.
Gently pull the old RCA jack assembly into the clear space between the heatsink
assembly and the chassis, as shown in Figure 9.
Notice the two twisted pairs connected to the RCA jacks:
1. Green and Black (green is left channel signal and the associated black is left
channel ground).
2. Red and Black (red is right channel signal and the associated black is right
channel ground).
Section 5: Installing the New RCA Jack Assembly
Clip the wires as close to the old jacks as possible to leave the maximum possible length.
Maintain the pair relationships. Strip ¼" of insulation from the ends of each of the 4
wires. Bend the ends into L-shaped hooks, and insert them into the new RCA jack
assembly:
1. Red wire to center conductor of red RCA jack.
2. Black wire from the red-black pair to the ground lug of the red RCA jack.
3. Green wire to the center conductor of the white RCA jack.
Figure 8-Remove 9 bottom screws
Page 9 of 12
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