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ASTRO
102BX, 102 BXA,
and 103
+5 Volt Regulator Modification
In order to decrease the high temperature
bèing
generated in the
frequency counter and the PTO compartment in the above sets, lt
is recommended that the following modification be accomp1ished.
This modification simply removes the +5 volt regulator and its
dropping resistor, inside the frequency counter, and moves these
components to the rear panel.
The fol1owing parts are required to accomplish this modification:
1
@
049-068 4.7 ohm 5W resistor
1
@
141-035 Terminal Strip
2
@
072-023 .01 mf Disc capacitor
1
@
Jumper wire 24 gauge 5/8" long (red)
1
@
Jumper wire 24 gauge
1~"
long (red)
1
@
765-011 #4 Int. lock washer
1
@
24 gauge 7 5/8" long wire (red) with a mo1ex
clip connected on one end
(For ASTRO 102BX and 102BXA only).
NOTE:
For molex connecter pin layout, reference figure #5.
Molex
connecter clips can be removed by using a dental tooI or
very small screwdriver to push on the clip locking tab
through the cut outs of the rubber connecter.
1.
Removal of the frequency counter:
Remove all cables, cords, and coaxes connected to the set.
Remove
the top cabinet (6 screws) and the bottom cover (6 screws).
Remove
the cover on the frequency counter (5 screws).
Disconnect the 8
pin white plastic connector
(~ls0)
and the coax with a ReA plug
(P15l) on the rear of the frequency counter box.
To disconnect PlsO,
gently push down on both sides of the plug (there are ears on each
side).
Remove the counter box by removing the four #4-40 screws
(ane at each of the four corners) which mount the box to brackets
underneath (don't remove the screws on the printed circuit board).
Lift the counter box out of the set.
If the box will not release,
the PTOA and PTOB light emitting diodes (L.E.D.s) may be caught
between the front panel and the escutcheon.
To release these L.E.D.s,
remove both PTO knoès and the #6-32screws (2) behind the knobs (these
screws are the straight slotted machine 5crews directly above the
PTO shafts).
2.
Modification of the frequency counter:
Remove the large printed circuit board, from the counter box, by
removing the four #4-40 screws (one at each corner).
Disconnect
the three pin molex connecter from the +5 volt regulator (UlOl)
which is mounted on the right rear of the box.
In the ASTRO 103,
be sure to note the positioning of the small aux. counter printed
circuit board at the left rear of the box ànd itsmolex connecter
(pin 1 of J166 goes toward the front).
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