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Ef Balance - Sony CDU31A Series Service Manual

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S-1-3 EF Balance
a.
Connect CH-I probe of oscilloscope to VC tcnninal on
fixture CDI and GND. (Refer to Fig. 5-I-3 (a))
Note: Set the oscilloscope as below
Display
CH-I
I
DC mode
Range
50mV/div. 5ms/div.
Trigger
AUTO mode
b.
Then set the wavcfonn to the center scale of
oscilloscope by turning of up/down positioning knob.
c.
Change the CH-I probe to tcnninal ofTE2 from VC.
d.
Select Play TNO by hitting the lFIOI key in Test Mode
menu.
c.
Select No. 18 with arrow key, then hitlEntcrlkcy.
f.
Select TRK OFF by hitting the ~ key in Test Mode
menu.
g.
Check if the EF Balance (ratio of plus and minus)
meets the following fonnula. (Refer to Fig. 5-I-3 (b))
JA- BJ<
lOmV
h.
If the ratio of EF Balance docs not meet the
specification, adjust RVI02 so that its Balance is less
than 7 mV.
Fig. 5-1-3 (a) EF Balance Adjustment
'
-~
.
i
.
:
- i-·1 t . . . . . .
r·-. .
n-. . . .
r . . · . .
t·-. . . .
t . . . . . . .
···Tl·--··r·-·-1··-·1········1···--·1········1-···-·1···-·
Fig. 5-1-3 (b) EF Balance Waveform
5-3

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