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No. 2D730-148E*O
(b)
PSD
This is a multiple output power supply, including 5 fixed voltage outputs.
Some voltages are supplied to the digital circuit of the system back-end and others are
supplied to the audio amplifier circuit and main panel.
output
output
I
I
Supply direction
power name
voltage
circuit
I
output
output
I
I
Supply direction
power name
voltage
circuit
P2.5D
P3.3D
+2.65 V
Rambus, BE-FPGA
P12D
circuit etc.
+3.40 V
AGP card, BE system
M12D
I/F, FPGA etc.
+12.0 V
Main panel and audio
Audio amplifier power
-12.0 v
supply
P5D
+5.10 V
CPU, video DAC
I
I circuit etc.
I
I
I
(c)
Control I/F
The analog differential signal CVTX for controlling the VTX voltage is supplied to the
PSA through the Backplane board from the RC board. Also, the ON/OFF control signal
is supplied to the PSX from the AC tray and the PSX status signal I/F is supplied to the
AC tray from the PSX.
(3)
Operational
check
(a)
Precautions for operational checks
Perform the operational
check paying attention to the following points
a.
Do not touch the input 48-V line. An electric shock may result. (The PSA/PSD
operates with 48 VI800 W.)
b.
Do not touch the output connectors during operation.
An electric shock may result.
(The PSA has outputs off
100 V.)
c.
Be careful when handling parts that may have a residual charge even after the
power supply is turned OFF. An electric shock may result. (The residual charge in
the output capacitors cannot be discharged immediately.)
d.
Do not disassemble
units such as the PSX box by removing the cover etc. (The
PSX is replaced as a unit.)
6-8
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