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6-2
2-1-5.
Specified I/O Level and Impedance
Input/output terminal
Video inputs
LINE IN
: phono jack
1 Vp-p, 75
Ω
, unbalanced, sync negative
Audio inputs
LINE IN
: phono jacks
47 k
Ω
, –7.5 dBs (0 dBs = 0.775 Vrms)
More than 10 k
Ω
, –4 dBs
Video outputs
LINE OUT : phono jack
1 Vp-p, 75
1 Vp-p, 75
Ω
, unbalanced, sync negative
Audio outputs
LINE OUT : phono jacks
–7.5 dBs at load impedance 47 k
–7.5 dBs at load impedance 47 k
Ω
Output impedance : less than 10
Ω
2-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
2-3. SERVO/VIDEO SYSTEM ADJUSTMENTS
2-3-1.
Switching Position Adjustment (MA-308 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.
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
CH1 : CNJ351 VIDEO LINE OUT
CH1 : CNJ351 VIDEO LINE OUT
Measurement Point
CH2 : Pin 3 of CN202
(MA-308 board)
(V SWP)
(MA-308 board)
(V SWP)
Measuring Instrument
Oscilloscope
Adjusting Element
RV401
Specified Value
6.5
±
1H (413
±
60
µ
sec)
Adjusting Method:
1)
Play back the alignment tape.
2)
Short Pin 1 and 2 of CN406.
3)
Check that switching position is 6.5
±
1H.
If not meet the specified value, turn RV401 and repeat steps 1
to 3).
to 3).
Checking power supply
Servo/Video system adjustment
Audio system adjustment
2-2. POWER SUPPLY CHECK (MA-308 BOARD)
Mode
E-E
Measuring Instrument
Digital voltmeter
+12 V check
Measurement Point
Measurement Point
Pin 4 of CN404
Specified Value
11.5V ~ 13.0V
+5 V check
Measurement Point
Measurement Point
Pin 8 of CN404
Specified Value
5V ~ 5.6V
+9 V check (EXCEPT XA127)
Measurement Point
Measurement Point
Emitter of Q961
Specified Value
8.5V ~ 10V
MTR12V check
Measurement Point
Measurement Point
Pin 4 of CN402
Specified Value
11.5V ~ 13.0V
Checking Method:
1)
Confirm that each voltage meets its specified value.
CH1
CH2
CH1
CH2
6.5
±
0.5 H
(413
±
60
µ
sec)
Vertical sync. signal
enlargement
V
Approx. 5 Vp-p
Approx. 2 Vp-p
(Pin
3
of CN202)
Fig. 6-2-3
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