Vco Adjustment - Sony DTC-1000ES Service Manual

DTC-|oooEs
+2-15. YCO A<ljustnent
Adiurtnent
1. Unsolder tap pattern @ on the digital board
and open it.
2. Connect CH-l of an æcilloscope to TP801
(on the
digitaf
board) and CH-z of an
æcilloscope to TP802 (on the digital board).
3. nrm
on the gower switch, iruert recorded
blank tape TY-308,
put the set into the
TEST mode, and then put t}te set into the
PLAY mode.
ûn the self-REC mode, set the REC volume
control to MIN.)
4. A<ljust RV802 so that the the DC voltage
difference of C8l9 is approximately -3.0 V.
5. Adjust RV801 so that the signal waveform at
TP801 satisfies the specifieation.
-Jt*r-l|-*+-+r+-++
6. Adjust RV804 so that the signal waveform at
TP801 satisfies the specification.
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Make flat.
?. Put the set into the CUE mode and finely
adjust RV802 so that the signal waveform at
TP801 satisfies the specifieation.
(TIre speeified wavefonm is tlte same as in
Step 6.)
8. Put the set into the REVIEW mode and finely
adjust RV802 so that the signal wavefôrm at
TP801 satisfies the specification.
(Ttre specified waveform is the same as in
Step 6.)
9. Alternate putting the set into the CUE and
REVIEW modes two or three times and check
that the signal waveform at TP801 satisfies
the specification.
(Itre specified waveform is the same as in
Step 6.)
N G
10. Î\rrn off the power switch and solder{ridge
the tap pattern.
11. Tlrn on the power switch and put the set
into the PLAY ( ) ) mode again.
12. Readjust RV802 so that the signal waveform
at TP801 satisfies the specification.
(Ttre specified waveform is the same as in
Step 6.)
13. Put tlte set into the CUE mode and finely
adjust RV802 so that the signal waveform
at TP801 satisfies the specification.
14. Put the set into the REVIEW mode and
eheck the signal waveforms at TP801 and
c 8 1 9 .
Should be decreased 0.3 V in the REVIEW
mode and 0.1 V in the PLAY mode.
15. Put the set into the PLAY mode and cheek
the signal waveform at TP801.
(Ttre specified waveform is the same as in
Step 11.)
16. Put the set into the FF AMS and REW AMS
modes and cheek the signal waveforms at
TP801 and C819 (in the 16 times normal
speed mode).
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