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3- 2- 1 1. VCO Adjustment
Adjustment :
1. Unsolder tap pattern @ on the main board and open
it.
2.
Connect CH- I of an oscilloscope to TP501 and CH-2
to TP502.
(Connect the trigger of the oscilloscope to SWP (pin 2
of CN542).)
3.
Turn on the power switch, insert a music tape, put the
set into the TEST mode, and put it into the PLAY
mode. (Any music tape can be used.)
4.
Adjust RV503 so that the DC potential difference at
TP5O2 is approximately -2.0V.
5.
Adjust RV502 so that the signal waveform at TP501
satisfies the specification.
-,\-rlt\+
-{*-++
Adjust RV501 so that the signal waveform at TP501
satisfies the specification.
Make flat.
7.
Put the set into the CUE mode and finely adjust RV502
so that the signal waveform at TPSOI satisfies the
specification.
(The specified waveform is the same as
in Step 6.)
8.
Put the set into the REVIEW mode and finely adjust
RV50l so that the signal waveform at TP50l satisfies
the specification.
(The 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 siSnal
waveform at TP501 satisfies the specification. (The
specified waveform is the same as in Step 6.)
10. Turn off the power switch and solder-bridge the tap
pattern.
11. Turn on the power switch and put the set into the
PLAY ( ))
mode again.
12. Readjust RV5O3 so that the signal waveform at TP50l
satisfies the specification.
(The specified waveform is
the same as in Step 6.)
N 6
13. Put the set into the CUE mode and finely adjust RV503
so that the signal waveform at TP50l satisfies the
specification.
14. Put the set into the REVIEW mode and check that the
signal waveform at TP501 satisfies the specification.
-
-
-
\ 1
\-.-\
should be decreased o.BV
in REVIEW mode and
0.1V in PLAY mode.
15. Put the set into the PLAY mode and check the signal
waveform at TP501.
(The specified waveform is the
same as in Step 6.)
16. Put the set into the FF AMS and REW AMS modes
and check the signal waveforms at TP501 and TP502
(in the 16 times normal speed mode).
Af
trfr
#nsor
- T P s 0 2
17. Set the TEST mode to OFF, put the set into
'the
FF
AMS and RE\4/ AMS modes, and check the signal wave-
forms at TPSOI and TP5O2 (in the AMS mode).
6.
p5g1
Voltages deflect significantly in
the positive (+)
direction.
TP5O2
TPsOI
Adjustment Location :
Servo board
(soldering side)
Servo board (Soldering side)
T P 5 O 2
'l"ruo,
- 1 6 -
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