
The PCM Summation Personality Card sums
multiple time slots on the PCM audio bus for the unselect audio for the
20.5.1 INTERNAL CONNECTIONS
1.Plug the summation card into J32.
2.Plug the summation card into the piggyback bus via J31.
3.Connect wire harness A3 on the Main Card to the summation card:
Rx PCM Primary U26, pin 13 to J4, pin 1 Master Clock U26, pin 9 to J4, pin 2 Master Sync U26, pin 7 to J4, pin 3
4.Connect wire harness A2 on the Main Card to the Summation Card:
5.Remove Q12 to ensure the
20.5.2 EXTERNAL CONNECTIONS
The Summed Unselect Audio Output is on the MA and MB external connections.
The Summed Select Audio Output is on the Primary Tx+ and Tx- connections.
20.5.3 ALIGNMENT PROCEDURE
1.Set CIM S5 to Test 9
(open section
2.Unselect audio adjust:
a.Set MCM S5 to Test 9 (open section
b.Press S2 on the MCM and release.
c.Adjust R36 for 4.0V
(Alternate method: Use the transmission test set and adjust R36 for
d.Adjust R37 for
3.Select Audio adjust:
a.Set MCM S5 to Test 10 (open section
close
b. Press S2 on the MCM and release.
c. Adjust R38 for 4.0V
d. Adjust R39 for
4.Set S5 on CIM and MCM (all sections closed).
5.Reset each module, press S2 and release.