Audio Owner Manual
Section 5
SERVICE ACCESS
ACCESS TO MIXER CIRCUITS
To implement any User Options, you will need to gain access to the internal
circuit cards, The various jumper links later defined are located on those cards.
Follow the outlined procedure to safely open the Scepter mixer.
The Scepter is composed of individual glass-epoxy circuit cards secured to
a
silk-screened aluminum front panel. A steel rear panel is secured to the rear of the
circuit cards by numerous jack nuts. This sub-assembly (i.e. Front panel, Circuit
cards and Rear Panel) is then inserted into a steel chassis. Eight 6x32 front panel
counter-sunk screws and eight 6x32 rear panel screws hold both assemblies
together. The front carrying handles also hold the two assemblies together with four
10x32 screws.
In order to get to the jumper links, you will have to first remove the Front
panel/Circuit card/Rear panel sub-assembly from the chassis and then remove the
Rear panel from the Circuit cards. The jumper links will then be accessible. NOTE:
If you need to change only the Master options (Mono or Stereo Out Jumpers) then
the Rear panel
DOES NOT
have to be separated from the Circuit cards. Eliminate
step 2 and proceed as far as step 7.
DISASSEMBLY
Perform all work on a soft surface to prevent undue scratching of the
Scepter unit.
Place the Scepter face down (resting on its handles) on a soft surface
Loosen (do not remove yet) the black plastic nuts from the
jacks.
Remove the 8 panel screws securing the Rear panel to the chassis.
Turn the Scepter over and remove the 8 countersunk screws securing the
Front panel to the Chassis. At this point the Handles screws are the only
fasteners holding the Front panel Assembly to the Chassis.
Support the Scepter on its front, but without using the handles for support. Use
a foam block or similar item 2” or greater in height to clear the handles.
Remove the 4 countersunk handle screws. Hold onto the handles when
performing this step to prevent them from rotating and possibly scratching the
Front panel.
Lift the Chassis off the Front panel assembly.
At this point you may make changes to the Master jumper links. The remaining
steps should only be performed if you need to remove the Rear panel. (This is
necessary if Input or
jumper links have to be changed or if servicing needs
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