Sony BVH-2000, Operation And Maintenance Manual

Page: 392 / 505

(9-1-12. AC-39 Board Operation Check
&
Adjustment)
2. Surge Current Protector Adjustment
Load; VTR Load (See section 9-1-4.)
Autotransformer
Mode of VTR~ STOP (STANDBY OFF)
Step
1.
922,
928
Step 2.
Connect AC power cable to the autotransformer and turn on the
power. the across C313/ AC-39 for Vdc the
Step 3. Adjustment AC-39 Board
RY301
=
Just ON
(I
RV302/AC-39
Low
Protector
Adjustment
Load;
Equipment; VTR Load (See section 9-1-4.)
Digital Voltmeter
Step 1.
Disconnect CN92
L
922, 923, 924. 925. 926. 927 and 928 from the
connector panel of the power unit.
Connect AC power cable to the autotransformer and tu rn on the
power. Set the voltage across C313/ AC-39 for 170 Vde with the
autotransformer.
IC301 pin-14
=
LOW level
(at the transition
of the level)
~ RV303/AC-39
Set the voltage across C313/ AC-39 for 165 Vde with the
autotransformer, and after 1 minute or more, check the circuit
protector CB301/ AC-39 activates.
BVH-2000{U/C)/PS/PM, BVH-2180{U/C)/PS/PM
BVH-2500{U/C)/P
4. High AC Input Voltage Protector Adjustment
9-1-4.)
Autotransformer
Mode of VTR~ STOP (ST.A.NDBY OFF)
Step
1.
the 926. and
Step 2.
Connect AC power cable to the autotransformer and turn on the
power. Set across C313/ AC-39 400 with
Step 3. Adjustment AC-39 Board
Turn ~ RV30 1/AC-39 gradually clockwise and stop it where the
circuit protector CB30 1/AC-39 just activates.
30 more, to
3.
Load; VTR Load (See section 9-1-4.)
Equipment; Oscilloscope
Mode of VTR~ STOP (STANDBY OFF)
TEST POINT
(Hot - Cold)
the power starting
9-13
I-
Z
UJ
~
Z
i
(9
-l
<t
>-
-l
Q..
Q..
~
(/)
0:
UJ
$
o
Q..
a)