Sony DNE-1000 Maintenance Manual page 36

1-11. Confirmation and Adjustment of Secondary Power Supply Voltage
6. If the specification does not meet, adjust the voltage as
described below.
n
The voltage adjustment is carried out with the digital
voltmeter connected to the check terminals.
[Adjustment procedures]
1. Remove the two screws and the blind plate of the
power supply unit.
2. Put the tip of an adjustment driver from the adjustment
window and turn the adjustment potentiometer of the
switching regulator. Turn the potentiometer to meet
the specification while monitoring the digital
voltmeter.
n
After all required boards are attached to the unit, carry
out the adjustment of secondary power supply voltage.
3. After the adjustment, detach the probes of the digital
voltmeter, attach the blind plate and close the front
panel.
Adjustment driver
BVTT 3
1-30(E)
RV1
RV2
RV3
Blind plate
5
x
2. Confirmation for voltage of +12 V
It is not required to adjust a voltage of +12 V.
If it is necessary to confirm the voltage, confirm the
voltage as described below.
[Check procedures]
1. Remove the fan cover on the rear panel.
(Refer to the section 3-1-1.)
2. Attach a digital voltmeter between 1-pin (+12 V) and
3-pin (GND) of the connector terminal (CN1 or CN2)
for a DC fan, and confirm that the voltage value meets
the following specification.
+1
Specification : +12
_0
3. After the confirmation, detach the two probes of the
digital voltmeter and close the font panel.
CN1
+12V 1-pin
GND 3-pin
+12V 1-pin
3-pin
GND
CN2
V
Rear panel
DNE-1000