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.
Mode
E-E
Signal
400 Hz, –7.5 dBs
Measurement point
CJ561 L/R
Measuring instrument
Audio level meter
Specified value
–7.5 ± 2 dBs
[Check Method]
1)
Input signal of 400 Hz and –7.5 dBs to the CJ561 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.
Mode
REC and PB (SP mode)
Signal
400 Hz, –17.5 dBs
7 kHz, –17.5 dBs
Measurement point
Audio output terminal
Measuring instrument
Audio level meter
Specified value
0 ± 3 dB
Note:
Tape path adjustment must have been completed.
[Confirmation Method]
1)
Supply a signal of 400 Hz, –17.5 dBs to both L and R channels
of Audio Line Input.
2)
Connect the audio level meter to the Audio Line Output.
3)
Adjust the attenuator so that the audio level meter will indicate
–17.5 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.
7)
Confirm that the 7 kHz playback output level within a range of
the 400 Hz playback output level 0 ± 3 dB.
2-4-2.
HiFi Switching Position Adjustment
(MA-341 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 color bar portion
Measurement point
CH1: Pin
1
of CN270 (HF ADJ)
CH2: Pin
3
of CN270 (RF SWP)
Measuring instrument
Oscilloscope
Adjusting element
REMOCON CH +/–
Specified value
B=minimize
[Adjustment Method]
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.
Fig. 6-2-5
B
CH1
HFADJ
CH2
RF SWP
Summary of Contents for SLV-772HF - Video Cassette Recorder
Page 5: ...1 1 SLV 772HF 779HF SECTION 1 GENERAL This section is extracted from instruction manual ...
Page 6: ...1 2 ...
Page 7: ...1 3 ...
Page 8: ...1 4 ...
Page 9: ...1 5 ...
Page 10: ...1 6 ...
Page 11: ...1 7 ...
Page 12: ...1 8 ...
Page 13: ...1 9 ...
Page 14: ...1 10 ...
Page 15: ...1 11 ...
Page 16: ...1 12 ...
Page 17: ...1 13 ...
Page 18: ...1 14 ...
Page 19: ...1 15 ...
Page 20: ...1 16 ...
Page 21: ...1 17 ...
Page 22: ...1 18 ...
Page 23: ...1 19 ...
Page 24: ...1 20 ...
Page 25: ...1 21 ...
Page 26: ...1 22 ...
Page 27: ...1 23E ...
Page 28: ......
Page 34: ......
Page 40: ......
Page 43: ...SLV 772HF 779HF 4 3 4 4 4 1 FRAME SCHEMATIC DIAGRAM FRAME SCHEMATIC DIAGRAM ...
Page 54: ......
Page 64: ......
