1-18
DFR-E3000
Power Supply Voltage Check
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A high voltage is applied to the power supply unit.
To avoid shock hazards, never touch the power supply unit
by bare hand.
Be extremely careful to perform the checking in a live
system.
Required equipment and tool
.
Digital voltmeter:
ADVANTEST TR6845 or
the equivalent
.
Extension board, EX-621: A-8318-782-A
Procedures
1.
Check the voltage at each measuring point on the
extension board using a digital voltmeter.
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If the specifications are not satisfied, replace the
switching regulator with the new ones.
Voltage
Measuring Point
Specification
(EX-621 board)
+
3.3 V
5 V (B-1)
*
+
3.3
±
0.1 V
+
5 V
3.3 V (C-1)
*
+
5.0
±
0.1 V
+
15 V
15 V (C-6)
+
15.0
±
0.5 V
_
15 V
_
15 V (C-6)
_
15.0
±
0.5 V
*
:
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Notice that the voltage values (3.3 V and 5 V) to be
checked differ from the voltage value printed on the
EX-621 extension board.
During 3.3 V check: 5 V measurement point on the
EX-621 board
During 5 V check:
3.3 V measurement point on the
EX-621 board
2.
After checking is completed, pull out the extension
board EX-621.
3.
Install the board retainer using the four screws.
1-4. Replacement of Main Parts
3.3V
5V
<EX-621 board>
A side (Component side)
15V
_
15V
GND
GND
