3-9(E)
FDDR-7000 IM
3-2. Confirmation and Adjustment of Secondary Power Supply Voltage
PSW4
x
8
Power Supply Unit
Slot Number 6
CPU-253 Board
POWER
Indicator
Check
Terminal
D35 5 V
D36 3 V
D37
_
5 V
+
5 B
+
3 V
CNT2
_
5 V
CNT3
GND
CNT4
CNT1
Board retainer
SHUTDOWN
Button
SYSTEM
Indicator
POWER
Indicator
_
5 V
+
12 V B
+
12 V A
+
5 V A
+
5 V B
+
3 V
Check Terminal
GND E
+
5 V A
GND B
+
12 V B
+
12 V A
GND A
POWER Switch
Power Supply Unit
Potentiometer
2. Confirmation for voltage of
+
+
+
+
+
5 V B,
+
+
+
+
+
3 V B,
and
_
5 V
The power supply voltages of
+
5 V (B),
+
3 V and
_
5 V
are used mainly as the power supply for plug-in circuit
boards.
The adjustment potentiometers are located on front panel
side of power supply unit and check terminals to connect
the probes of a digital voltmeter for the voltage
measurement are located on CPU-253 board.
<Check procedures>
1.
Remove the front panel. (Refer to the section 1-5-1.)
2.
Confirm that the power supply unit is properly inserted
and securely fixed with the four screws.
3.
Turn ON the power and confirm that the POWER
indicators
(
*
1)
on the CPU-253 board light up.
(
*
1) : POWER indicators
D35, D36 and D37 on the CPU-253 board
4.
Connect the digital voltmeter between check terminals
on CPU-253 board. Confirm that the voltage values of
each check terminal meet the following specifications.
n
Remove the board retainer (fan) and connect the
digital voltmeter to the check terminals.
5.
If the specification does not meet, adjust the voltage as
described below.
n
Perform any adjustments when all of the required
plug-in boards have been installed.
The number of plug-in boards differs depending on the
FARAD system configuration. (Up to ten plug-in
boards can be installed in the FDDR-7000.)
Voltage
Specification
Check terminal
Adjustment potentiometer
+
5 V B
+
5.00
±
0.05 V
CPU-253 board
Power Supply Unit
+
5 V B
↔
GND
1+
5 V B
+
3 V
+
3.40
+
0.05 V
CPU-253 board
Power Supply Unit
_
0.00 V
+
3 V
↔
GND
1+
3 V
_
5 V
_
5.00
±
0.05 V
CPU-253 board
Power Supply Unit
_
5 V
↔
GND E
1_
5 V
