Sony DFR-E3000 Maintenance Manual page 24

1-4. Replacement of Main Parts
Power Supply Voltage Check
n
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:
. Extension board, EX-621: A-8318-782-A
1-18
ADVANTEST TR6845 or
the equivalent
Procedures
1. Check the voltage at each measuring point on the
extension board using a digital voltmeter.
n
If the specifications are not satisfied, replace the
switching regulator with the new ones.
Voltage Measuring Point
(EX-621 board)
+3.3 V *
5 V (B-1)
*
+5 V 3.3 V (C-1)
+15 V 15 V (C-6)
_15 V _15 V (C-6)
*: n
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
<EX-621 board>
3.3V
5V
GND
2. After checking is completed, pull out the extension
board EX-621.
3. Install the board retainer using the four screws.
Specification
+3.3 ± 0.1 V
+5.0 ± 0.1 V
+15.0 ± 0.5 V
_15.0 ± 0.5 V
15V
_15V
GND
A side (Component side)
DFR-E3000