7-3
2-3.
SERVO SYSTEM Adjustment
2-3-1.
RF Switching Position Adjustment
(RP-230 Board)
Purpose:
Adjust the interval between A ch and B ch of tape playback out-
put.
Improve the interchangeability with other tapes and sets.
When it is out of order, the interval appears on the screen, the
screen is disturbed.
Mode
PB
Signal
Alignment tape SP mode
color bar
Measurement Point
CH1: VIDEO LINE OUT
CH2: Pin
2
of CN261 (RP-
230 board) (RF SWP)
Measuring Instrument
Oscilloscope
Specified Value
6.5 ± 0.5 H (416 ± 32 µsec)
Adjusting Method:
1) Connect RP-230 board Pin
5
of CN261 to the GND for about
1 secont to activate the RF switching position adjustment mode.
2) Check appear “A P” on FL display.
3) Using the c and – buttons, adjust to 416 ± 32 µsec
(6.5 ± 0.5 H).
4) Press the pause button.
2-4.
VIDEO SYSTEM ADJUSTMENT
Adjust the video system in the following sequence as a rule. The
color video signal supplied from the pattern generator is used as a
video input signal for video system adjustment in the recording
mode.
Make sure that sync. and color burst signals meet requirements
specified at set up of adjustment shown in Fig. 7-2-1.
[Adjustment Sequence]
2-4-1.
Playback Y Signal Level Check
2-4-2.
Recording Chroma Level Check
2-4-3.
Sync. AGC Check
2-4-4.
X’tal Oscillation Frequency Check
2-4-1.
Playback Y Signal Level Check
(MA-315 Board)
Purpose:
Confirm that the playback Y signal level is correct.
Mode
PB
Signal
Alignment tape SP color bar
Measurement point
Pin
#•
IC201
Measurement equipment
Oscilloscope
Specified value
2.10 ± 0.18 Vp-p
Confirmation Method:
1) Confirm that the play Y level is 2.10 ± 0.18 Vp-p.
Fig. 7-2-4.
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enargement
CH1
CH2
CH1
Vertical sync. signal
sec)
2.10
±
0.18 Vp-p
H
White (100%)
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