Service manual

System Overview 1-63
The power module converts 48 VDC to the following required outputs.
• - 1.7VP at 24 amps
• +1.7V at 45 amps
• +3.3VP at 45 amps
• +3.3V at 90 amps
Separate converters on the module put out each voltage. The VP voltages are
routed to the phase lock loop clocks thoughout the QBB. Other voltages power
the rest of the QBB including the modules that plug into it.
Figure 1–27 shows the block diagram of the main power module and its
daughtercard that contains the control logic for the converters.
LEDs
CONV3 Overtemp
(yellow)
On
Off (normal)
If overtemp condition for converter 3
If temp OK at converter 3 in location E12
CONV2 Overtemp
(yellow)
On
Off (normal)
If overtemp condition for converter 2
If temp OK at converter 2 in location E6
CONV1 Overtemp
(yellow)
On
Off (normal)
If overtemp condition for converter 1
If temp OK at converter 1 in location E2
CONV0 Overtemp
(yellow)
On
Off (normal)
If overtemp condition for converter 0
If temp OK at converter 0 in location E1
Vaux Present
(green)
On (normal)
Off
Vaux present at the module
Vaux not present
Swap OK
(yellow)
On
Off (normal)
Ok to swap out the module (Vaux Present
LED may be on also)
The module is not ready to swap out
Module OK
(green)
On (normal)
Off
All voltages on the module are within
tolerances
At least one voltage is out of tolerance