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2-3.
SERVO SYSTEM ADJUSTMENT
2-3-1.
RF Switching Position Adjustment
(MA-360 Board)
[Adjustment Purpose]
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
Mode
Playback
Signal
Alignment tape:
SP mode color bar portion
Measurement Point
CH1: VIDEO LINE OUT terminal
CH2: CN270 pin 3 (RF SWP)
Measuring Instrument
Oscilloscope
t = 413 ± 32 µ sec (6.5 ± 0.5 H)
Specified Value
[Adjustment method]
Connect JS161 (IC161 pin %§ ) (SW POS ADJ) and GND with
1)
a jumper wire.
2)
Check that "AP" indicator on the display window turns on.
3)
Remove the jumper wire.
3)
Press CHANNEL+ and CHANNEL– buttons and adjust the
switching position (t) to the specified value.
4)
Press PAUSE button to write the data in EEPROM.
5)
Check that the display changes to "AH" and mode goes to the
Hi-Fi switching position adjustment.
6)
Perform "Hi-Fi Switching Position Adjustment".
CH1
CH2
CH1
CH2
Fig. 6-2-3
2 V
Magnified
V sync
t
2-3-2.
Hi-Fi Switching Position Adjustment
(MA-360 Board)
[Adjustment Purpose]
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the switching noise will be heard, etc.
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Note: Perform "RF Switching Position Adjustment" before this adjustment.
[Adjustment method]
1)
Check that "AH" indicator on the display window turns on.
2)
Press CHANNEL+ and CHANNEL– buttons and minimize
the part A of PB AF RF signal.
3)
Press PAUSE button to write the data in EEPROM.
4)
Check that the "AH" indicator turns off.
A
CH1
CH2
6-3
Playback
Alignment tape:
SP mode color bar portion
CH1: CN270 pin 1 (HF ADJ)
CH2: CN270 pin 3 (RF SWP)
Oscilloscope
A = minimum
A
2 V
Fig. 6-2-4
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