Swann CUBIC ASTRO 102 BX Service Manual page 174

6. ASTRO 103 ONLY
Rewiring the set: Turn the set upside down and very carefu11y re-
move the shie1d on the right side (covers the L.O. and Aux. L.O.
boards). Locate the two mo1ex connecters on the 1eft rear of the
Aux. L.O. board. Remove the pin #2 in both connecters (P173 and
P174, which mate to J173 and J174) and cut these pins off their
wires. Pull the wires back to the top of the chassis. Carefu11y
reinstall the large shie1d over the boards, do not pinch any wires
or ribbon cables. Turn the set upright and reroute these two wires.
The red or red/vio. wire on pin 2 of P127 (mates to J127, 1eft rear
mo1ex connecter on the distribution board) shou1d be rerouted a10ng
the rear of the distribution board to the area where the hole was
drilled in the rear panel in step #4. Solder this wire to 1ug #1
(bottom 1ug) of the new regulator terminal strip. Reroute the other
wire (red or red/vio.) a10ng the right side and the rear of the dis-
tribution board and solder to 1ug #3 of the new regulator terminal
strip. Make sure there is therma1cote on the back of the +S volt
regulator, connect the mo1ex connecter to it and mount it a10ng
with the terminal strip to the rear panel (reference figure #4).
Use the hardware that origina11y mounted the regulator in the counter
box and the new #4 lockwasher supp1ied.
7. Reinstalling the frequency counter box:
Reinstall the box by reversing the remova1 procedure (reference
step #1). Make sure that the YTOA and PTOB L.E.D.s are in their
respective holes in the escutcheon. Insta11 the four screws which
mount the box to the brackets underneath and realign and tighten
down the escutcheion if it was loosened during counter box remova1.
Reinstall the PTO knobs if they were removed. Connect P1S0 to J1S0
(the white plastic connecters on the rear of the box). Plug in the
RCA plug (P1S1, coax 1ine) in the rear of the counter box. Make
very sure these connecters are tight.
8-.
Testing:
Extreme caution is required in this step because over voltage in the
frequency counter cou1d destroy some of the I.C.s. Make sure the
set's power switch is "off." Connect a power supp1y to the set and
;turn i t "on". Connect -avo 1 tmeter to the frequency counter and
monitor the +SV bus (reference figure
#1~
the +SV is the 1eft con-
~ection
of the sma11 jumper which was installed) . Turn the set "on'.'
Quick1y turn the set "off" if this voltage is not close to +S Volts
and investigate. If the voltage is close to +S Volts and the fre-
quency counter readout lights, remove the voltmeter and turn the set
"off".
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