8-4. BUS MULTIPLEXER CCA 2A2A7A6A7 (cont)
8 - 4
Visually inspect connections to
insure no visible shorts exist prior
to applying power.
Connect frequency counter input clip
lead to U25-10 (7) (location 26R on
back) on BUS multiplexer CCA.
Connect ground clip lead to CCA
ground labled G on back of CCA.
Energize CB1 on AC Control Panel
Wait 10 seconds, then energize
Allow 10 minutes warmup time
Observe counter for a displayed
frequency between 6.719988 and
Allow 30 minutes for reading to
If counter indicates frequency is
within limits, no adjustments are
If frequency is not
within limits, continue with step