SERVICE MANUAL

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 output.
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 channel + and – buttons, adjust to 416 ± 32 µsec
(6.5 ± 0.5 H).
4) Press the pause button.
CH1
CH2
CH1
CH2
enargement
6.5 ± 0.5 H
(416 ± 32 µsec)
Fig. 7-2-3.
V
Approx. 1 Vp-p
Approx. 5 Vp-p
Vertical sync. signal
7-3
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.
H
White (100%)
Fig. 7-2-4.
2.10 ± 0.18 Vp-p