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6-3
2-3.
SERVO SYSTEM CHECK
2-3-1.
RF Switching Position Adjustment
(MA-370 Board)
(MA-370 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.
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 color bar portion
Measurement point
CH1: CN270 pin 2 (PB RF)
CH2: CN270 pin 3 (RF SWP)
CH2: CN270 pin 3 (RF SWP)
Measuring instrument
Oscilloscope
Adjusting element
Remote Commander CH+/–
Specified value
A=minimize
[Adjustment Method]
1)
1)
Playback the alignment tape.
2)
Short JS401 to Ground.
3)
Check that “A P” is indicated on FL display.
4)
Adjust so that part A becomes minimized at CH +/–.
5)
Write data in EEPROM by pressing PAUSE button.
Monoral model:
6)
6)
The display “A P” disappears and then the Adjustment mode
terminates.
terminates.
Hi-Fi model:
6)
6)
The display changes to “A H” and the mode goes to the HiFi
switching position Adjustment.(2-4-2.)
switching position Adjustment.(2-4-2.)
Fig. 6-2-3
2-4.
AUDIO SYSTEM ADJUSTMENT
• Adjust both L ch and R ch.
[Connecting Instruments]
[Connecting Instruments]
Fig. 6-2-4
2-4-1.
Hi-Fi Audio System Adjustment
(Hi-Fi model only)
(Hi-Fi model only)
• Perform the adjustment setting the switch on the following
positions.
• AUDIO MONITOR ..................................................... STEREO
[Adjustment Method]
1.
1.
ACE head adjustment.....Refer to the VHS mechanical
adjustment manual (S MECHANISM)(9-921-647-11).
adjustment manual (S MECHANISM)(9-921-647-11).
2.
E-E output level check
3.
“Recording Bias Adjustment”
A
CH1
PB RF
CH2
RF SWP
Audio line OUTPUT L/R
Audio line INPUT L/R
Audio oscillator
Attenuator
600
Ω
Audio level meter
or distortion meter
or distortion meter
47 k
Ω
VTR
6-4
2-4-3.
Normal Audio System Adjustment
• Make adjustment in the SP mode unless otherwise specified. Use
a normal VHS cassette for an adjustment tape.
• Set AUDIO MONITOR to normal.
2-4-4.
ACE Head Adjustment
Refer to the VHS mechanical adjustment manual
(S
MECHANISM) (9-921-647-11).
2-4-5.
E-E Output Level Check
[Adjustment purpose]
Confirm that the output level adjust the reference input is within the
specification.
Confirm that the output level adjust the reference input is within the
specification.
Mode
E-E
Signal
400 Hz, –7.5 dBs
Measurement point
J561 L/R
Measuring instrument
Audio level meter
Specified value
–7.5 ± 2 dBs
[Check Method]
1)
1)
Input signal of 400 Hz and –7.5 dBs to the J561 L/R.
2)
Check that the audio output level is –7.5 ± 2 dBs.
2-4-6.
Frequency Response Check
[Adjustment purpose]
Confirm that the frequency characteristic is within the specification.
Confirm that the frequency characteristic is within the specification.
Mode
REC and PB (SP mode)
Signal
400 Hz, –17.5 dBs
7 kHz, –17.5 dBs
7 kHz, –17.5 dBs
Measurement point
J561 L/R
Measuring instrument
Audio level meter
Specified value
0 ± 3 dB
Note:
Tape path adjustment must have been completed.
[Confirmation Method]
1)
1)
Supply a signal of 400 Hz, –17.5 dBs to J561 L/R.
2)
Connect the audio level meter to J561 L/R.
3)
Adjust the attenuator so that the audio level meter will indicate
–27.5 dBs.
–27.5 dBs.
4)
Make recording in the SP mode.
5)
Set an audio line input signal to 7 kHz and make recording.
6)
Playback a recorded portion, and measure output levels at 400
Hz and 7 kHz.
Hz and 7 kHz.
7)
Confirm that the 7 kHz playback output level within a range of
the 400 Hz playback output level 0 ± 3 dB.
the 400 Hz playback output level 0 ± 3 dB.
2-4-2.
HiFi Switching Position Adjustment
(MA-370 Board)
(MA-370 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.
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 color bar portion
Measurement point
CH1: Pin 1 of CN270 (HF ADJ)
CH2: Pin 3 of CN270 (RF SWP)
CH2: Pin 3 of CN270 (RF SWP)
Measuring instrument
Oscilloscope
Adjusting element
Remote Commander CH +/–
Specified value
B=minimize
[Adjustment Method]
1)
1)
Check that “A H” is indicated on FL display.
2)
Adjust so that part B becomes minimized at CH +/–.
3)
Write data EEPROM by pressing PAUSE button.
4)
Check that “A H” indicator turns off.
5)
If “A H” indicator is still on, restart RF switching position
Adjustment from the beginning.
Adjustment from the beginning.
Fig. 6-2-5
B
CH1
HFADJ
CH2
RF SWP
2-5.
ADJUSTING PARTS LOCATION DIAGRAM
MA-370 BOARD
(CONDUCTOR SIDE)
(CONDUCTOR SIDE)
6-6
J561
VIDEO/AUDIO LINE
IN/OUT
CN270
RF/HF SWP
4
1
Q605
Q607
C627
+30 V
+12V
D420
-11V
+6V
SW5V
MTR12 V
B
E
B
E
+
1
4
IC601
JS401
ADJ
1
30
ND420
MEMO
6-8E
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