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Preparing to Install the Assembled PAT4PPR Circuit Board
1.
Disconnect the PAT-4 from your music system.
2.
Unplug the power cord and allow the preamp to sit for one minute before moving
on.
Caution: Be sure that the preamp power is unplugged! 120 VAC can be lethal! 240 VAC
can be lethal!
3.
Remove the 4 screws that hold the cover in place, 2 on the left side and 2 on the
right side.
4.
Lift the cover straight up and set it aside in a safe place.
Drilling Mounting Holes in the PAT-4 Chassis
You’ll need to add two 9/64” mounting holes to the PAT-4 chassis. 5/32” holes are also
ok, and may give you a bit more margin if you drill slips a bit. It’s a good idea to use a
center-punch to locate the centers of the two mounting holes. Without the center-punch,
the drill will tend to drift off the mark.
Figure 5-Locating the mounting holes
Locate the drill holes near the selector switch as follows:
1.
The front mounting hole should be on a line with the front hole that holds the
cover. The center of the hole should be 0.250” from the inside lip of the chassis so
that the end of the bracket won’t bump into the lip of the chassis.
2.
The rear mounting hole is also placed 0.25” from the inside lip of the chassis, but
it is located 3.400” behind the front mounting hole.
Figure 6-locating the two added 9/64" mounting holes
An easy way to locate the holes is to sit the PCB with mounting brackets (make sure
they’re on straight) in the intended location, then mark the hole locations with a pencil or
a center-punch.
Connect the RCA Jacks
Remove the PEC 555005. It is no longer needed. Please note that the PHONO HIGH and
PHONO CER jacks will no longer be active.
De-solder or cut any existing wires on the
center
terminals of either the right or left
channel PHONO LOW input jacks.