Sony SLV-E830B, Service Manual

Page: 55 / 129

6-3
[Adjustment Method]
1)
Short-circuit between pin
5
(AV ADJ) and
3
(GND) of CN261
for about 1 second to activate the RF switching position
adjustment mode.
2) Check that “AF” is indicated on FL display.
3) Using the p and – buttons, adjust to 416 ± 32
µ
sec
(6.5 ± 0.5H).
4) Press the PAUSE button.
5) The set goes to the AF switching position adjustment mode.
Fig. 6-2-3
6) Check that “AH” is indicated on FL display.
7) Using the p and – buttons, minimize a chipped portion.
At this time, confirm that a noisy sound is not heard.
8) Press the PAUSE button.
9) Press the EJECT button.
Fig. 6-2-4
2-4. VIDEO SYSTEM CHECKS
For the video system checks, follow the checking procedures given
below as a rule. The color bar video signal supplied from the pattern
generator is used as the video input signal for the video system
adjustment of the recording mode. Check that the signal satisfies
the specified value designated in the “Check of input signal” (Fig.
6-2-2)
Unless otherwise specified, set the switches to the following
positions.
• INPUT SELECT switch ................................................. LINE 1
• TAPE SPEED switch ............................................................ SP
[Checking Sequence]
1)
X’tal OSC Check
2) SYNC AGC Check
3) White clip/Dark clip Check
4) Recording Y Level Check
5) Recording Chroma Level Check
6) Playback Level Check
2-4-1. X’tal OSC Check (MA-316 Board)
Mode Playback
Signal Alignment tape: SP Color bar portion
Measurement point Q211 Emitter
Measuring instrument Oscilloscope and Frequency counter
Specified value 4,433,619 ± 96Hz
Note: A frequency counter should be connected through a buffer
amplifier (oscilloscope, etc.) having a high impedance and
a low capacitance.
[Check Method]
1)
Check that the oscillation frequency satisfies the specified value
and that the oscillation voltage is 500 ± 200mVp-p.
Fig. 6-2-5
(CN261 PIN
2
(RF SWP))
(RP-231)
6.5
±
0.5H
(416
±
32
µ
sec)
Approx.
1Vp-p
Approx.
5Vp-p
V
CH1
CH2
Enlargement
Vertical sync. signal
CH1
CH2
CH2
RF SWP
(CN261 PIN
2
)
(RP-231)
CH1
HF ADJ
(CN341
PIN
1
)
(RP-231)
OK
NG
Should be minimized
RF signal dropout
500
±
200mVp-p
4,443,619
±
96Hz