Nortel Meridian 1 Manual page 25

2-12 SL-1 A, M, S, and MS system upgrades
553-3001-250 Standard 14.00 August 1996
Preparing the M system for upgrade
1 Set all shelf circuit breakers to OFF.
2 Set the CAB INP circuit breaker on the QSD23 power control shelf in the
QCA37 cabinet to OFF.
3 Set the AC input circuit breaker on the –48V rectifier in the QCA37
cabinet to OFF.
4 Tag and disconnect all cables from connectors on the QPC139 and
QPC376 cards.
5 Remove the cards from the QSD26 CE shelf and store them in a safe
place.
6 Tag and disconnect the tape unit alarm connector. To do this, you must
first remove the tape unit and then disconnect the alarm connector.
7 The CE shelf will not be used after the upgrade is completed. You may
remove it now if you wish:
• Tag and disconnect power connectors and alarm connectors from
the QSD26 shelf. Tape all exposed power leads with electrical
insulation tape.
Note: If the cabinet is equipped with an expansion CE shelf (a second
CE shelf), disconnect and remove the wiring between the +5V, +12V,
–12V, and LGND connections on the CE shelf.
• Tag and disconnect all CE alarm connectors.
• Remove the QPC84 Power Monitor and set switches to disable
power monitoring in the CE shelf. A QPC84 Power Monitor vintage
S or later is required. Refer to Circuit card installation and testing
(553-3001-211) for switch setting information.
• Install the QPC84S Power Monitor.