Nortel Meridian 1 Manual page 47

2-34 SL-1 A, M, S, and MS system upgrades
553-3001-250 Standard 14.00 August 1996
9 Tag and disconnect any remaining cables connected to cards on the CE
shelf.
Note: The main CE shelf is located at the bottom left shelf position in
the cabinet (viewed from the front). An optional expansion CE shelf may
be located at the top right shelf position.
10 Remove cards from the CE shelf and store them in a safe place.
11 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 from the power distribution
harness to the backplane of the main CE shelf and the expansion CE
shelf, if equipped. 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.
Preparing the MS system for upgrade
1 Set the CAB INP circuit breaker on the QSP43 power control shelf in the
QCA109 cabinet and all other shelf circuit breakers to OFF.
2 Set the AC input circuit breaker on the –48V rectifier in the QCA109
cabinet to OFF.
3 Tag and disconnect cables from connectors on the faceplate of the
following cards located on the CE shelf:
• QPC425 CPU/SDI card
• QPC376 network cards
• QPC139 SDI cards, if equipped