User's Manual

CHAPTER 4 NDA-24300
Page 292
Issue 1
UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
• OPE lamp on the PA-SDTB card is
red.
• When any connection link exists, the
nailed-down connection between the
FCH (PA-FCHA) and SDT (PA-
SDTB) cards is cut off. Already
established calls, while in speech,
are all disconnected.
• Confirm that the MB key on the new
card is set UP (=ON). If the new card
is PA-SDTA, also confirm that
Switch 4 of the P-SW key is ON.
B
A
Referring to the card removed, perform
the switch settings on the new card.
On the PA-SDTB card, set the MB key UP (=ON).
Remove the flat cables from the front connectors, I/O
and PCM, on both PA-SDTB and PA-SDTA cards.
When replacing the PA-SDTB, also remove MT24
TSW cables from all the front connectors on the card.
Extract both PA-SDTA/PA-SDTB cards,
simultaneously.