Step 4
– Place the circuit board on the chassis. Align one
of
the short edges of the circuit board against the mark on the
masking tape and center the two long edges equally between
the two chassis sides (photo 6.1d).
Step 5
– With a permanent marker, place a mark on the chassis
through each of the four holes at each corner of the circuit
board.
Step 6
– Remove the circuit board. With a center punch (or
something similar), place a solid mark into the chassis at each
of
the permanent marker points.
Step 7 –
Lay the circuit board onto the chassis and verify that the marks line up correctly with
the four corner mounting holes of the circuit board.
Step 8
– Once verified, remove the circuit board and drill four, 5/32” holes, one hole at each
of these marked spots.
Step 9
– Remove any burrs around holes. A deburring tool
is very
helpful here. Verify results by lining up mounting
holes with PC board.
Proceed to step 6.2
Mounting
the Power Transformer
Step 1
–
Loosely twist all power transformer wires together
and slowly guide the wire bundle through
the
chassis
opening. Twist both yellow wires together, both red wires
together, and both red/
yell
& red/
blu
striped wires do not
get twisted.
For 120v/60hz operation
t
he b
lk
/wht
striped
wire gets twisted with bl
k
wire, solid
wht
gets twisted with
wht/blk
. For 240v see Diagram 6.2a
Step 2
– Situate the transformer so that the primary wires
(blk/
wht,solid wht &
blk,
wht
/blk
) are
nearest to the fuse holder.
Next
,
connect your ac cords white
neutral to the transformer's
wht &
wht
/
blk
wire
from your transformer then solder
& heatshrink the exposed area.
Now connect solid blk &
b
lk/wht
wires to the power switch (use the tab on the side opposite of the fuse holder).
Step 3
– Install and tighten two #8 KEPS nuts on the transformer
mounting bolts nearest the edge
side of the chassis (photo 6.2a).
Step 4
– Bend the two #8 solder tabs at a slight angle (photo 6.2b).
Step 5
– Install these tabs on the remaining two transformer bolts,
oriented at angles toward the
chassis edges (photo 6.2a).
Step 6
– Install the two #8 standard nuts on these two bolts wit
h
the
solder tabs (photo 6.2a).
Proceed to 6.3
Installing the Rubber Grommets
Step 1
– locate the two 3/8” rubber grommets
and the two corresponding holes on the
chassis.
Step 2
– Insert the two rubber grommets in the
chassis holes (photos 6.3a and 6.3b).
6.3
photo 6.3a
6.2
TubeDepot.com 13
NOTE
A sharp, large nail and hammer make a great make-shift center punch. By placing the nail
on the permanent marker mark and firmly tapping the head of the nail with the hammer, the
resultant mark in the metal is perfect for accurately guiding the drill bit into the chassis.
NOTE
Use a new drill bit when drilling this chassis. Go slowly through the steel at a low rotational
speed. A little drop of light oil at each drilling point helps too. These practices will allow the
metal to be cut cleanly with minimal formation of burrs.
Diagram
6.2a
photo 6.3b
photo 6.1d
