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.
Audio Level and Distortion Check
[Adjustment purpose]
Confirm that the audio level and distortion is within the specification.
Mode
REC and PB (SP mode)
Signal
400 Hz, –7.5 dBs
Measurement point
Audio output terminal
Measuring instrument
Audio level meter and distortion
meter
Specified value
PB level
: –7.5±2dBs (HIFI)
PB level
: –7.5±3dBs (MONO)
Distortion
: less than 1% (HIFI)
Distortion
: less than 4% (MONO)
[Confirmation Method]
1)
Supply a signal of 400 Hz, –7.5 dBs to both L and R channels
of Audio Line Input.
2)
Record the tape.
3)
Playback a recorded portion of the tape.
4)
Confirm that the playback output level of audio level meter is
within of range –7.5±2dBs for HIFI and –7.5±3dBs for MONO.
5)
Confirm that the output of distortion meter is less than 1% for
HIFI and 4% for MONO.
2-4-2.
HiFi Switching Position Adjustment
(MA-405 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
Remote Commander 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
CH1
HFADJ
CH2
RF SWP
B
2-4-5.
Audio Noise Check
[Adjustment purpose]
Confirm that the noise level is within the specification.
Mode
REC and PB (SP mode)
Signal
No signal input
Measurement point
Audio output terminal
Measuring instrument
Audio level meter
Specified value
Less than –67,5dBs (HIFI)
Less than –45.5dBs (MONO)
[Confirmation method]
1)
Audio line input L and R channels are shorted to the ground.
2)
Record the tape.
3)
Playback a recorded portion of the tape.
4)
Confirm that the output level is less than –67.5dBs for HIFI
and –45.5dBs for MONO.
2-4-6.
ACE Head Adjustment
Refer to the VHS mechanical adjustment manual
(S
MECHANISM) (9-921-647-11).
2-4-7.
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
CNJ562 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 CNJ562 L/R.
2)
Check that the audio output level is –7.5 ± 2 dBs.
2-4-8.
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
CNJ562 L/R
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 CNJ562 L/R.
2)
Connect the audio level meter to CNJ562 L/R.
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.
Summary of Contents for RMT-V293A
Page 29: ...SLV LX40 LX50 LX60S LX70S 3 1 3 2 SECTION 3 BLOCK DIAGRAMS 3 1 OVERALL BLOCK DIAGRAM ...
Page 30: ...SLV LX40 LX50 LX60S LX70S 3 3 3 4 3 2 VIDEO BLOCK DIAGRAM ...
Page 31: ...SLV LX40 LX50 LX60S LX70S 3 5 3 6 3 3 SERVO SYSTEM CONTROL BLOCK DIAGRAM ...
Page 32: ...SLV LX40 LX50 LX60S LX70S 3 7 3 8 3 4 TUNER BLOCK DIAGRAM LX40 LX50 ...
Page 33: ...SLV LX40 LX50 LX60S LX70S 3 9 3 10 3 5 AUDIO BLOCK DIAGRAM ...
Page 34: ...SLV LX40 LX50 LX60S LX70S 3 11 3 12E 3 6 POWER BLOCK DIAGRAM ...
Page 70: ...7 14 Ref No Part No Description Remarks Ref No Part No Description Remarks ...
