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7. Audio Circuit Adjustments
7-1. Hi-Fi audio playback level check
7-2. E-E audio level check
Purpose:
To set the playback level of the Hi-Fi audio signal to
the specified value.
Fault due to incomplete adjustment:
The appropriate volume cannot be obtained during
playback.
Test Equipment/Jigs and Connection Points
Voltmeter: When checking L-CH:PG2508-5
When checking R-CH:PG2508-4
Hi-Fi alignment tape (24HMAF-2)
State of VCR
Play Hi-Fi alignment tape.
Purpose:
To check the audio level in the E-E mode.
Fault due to incomplete adjustment:
To sound is abnormal in the E-E mode.
Test Equipment/Jigs
2) CPR oscillator:
Audio in jack(L-CH)
Audio in jack(R-CH)
2) Voltmeter:
Audio out jack(L-CH)
Audio out jack(R-CH)
State of VCR
E-E mode
Adjustment procedure
Use the same checking procedure for both the L and R
channels.
Check that the voltmeter reads -7.8dBs + 3.0dBs.
If it cannot be confirmed, check the Playback signal
system,
¥
:
8. Tape Navigation Circuit Adjustments
8-1. Skew adjustment
Purpose:
i
:
To minimize the flicker on the screen:
Fault due to incomplete adjustment:
Skew or fliking: oveurs on'sereen causing the picture to
be distored.
i
Test EquipmentJigs and 4 Conneaion Points
Voltmeter
Monitor TV:
Video output
Alignment tape (HM-2)
9. MPX Audio Circuit Adjustments (For JU)
9-1, MPX separation adjustment
Purpose:
To set the playback level of the Hi-Fi audio signal to,
the spécified value.
Fault due to incomplete adjustment:
The appropriate volume cannot be obtained during
playback:
Test EquipmentJigs and Connection Points
Voltmeter "When checking L-CH:Audio output (L) jack
» When checking R-CH: 'Audio output (R) jack
Hi-Fi alignment tape (24HMAF- BL
State of VCR
Play Hi-Fi-alignment tape.
Adjustment Point
RT1802
Adjustment procedure
Use.the same checking procedure for Poet the Land R
channels.
Check that the voltmeter reads -7.8dBs + 3.0dBs-
If it cannot be confirmed, check the playback signal
system.
9-2. MTS input level adjustment
Purpose: .
To set the level of the MTS signal supplied to the
Adjustment procedure
1) Apply a 1kHz, -7.8dBs sinewave signal to the audio
input 1 (L-CH and R-CH).
2) Check that the voltmeter reads -6.8dBs+2. Odis.
3) If the above cannot be confirmed, check the E-E
audio line.
State of VCR
Play back alignment tape (color bar section)
Adjustment Point RT351
Adjustment procedure
Adjust RT351 to minimize flicker on the TV screen.7-2.
MTS processor in i¢1801 from the.tuner/IF to the
specified level.
Fault due to incomplete adjustment:
The S/N deteriorates or distortion becomes conspicuous.
Stereo separation deteriorates.
Test Equipment/Jigs Connection Points
MTS sound signal generator: IN FORM ANT
Voltmeter: TP1801
State of VCR
E-E mode
Adjustment Point
RT1801
3-6
Adjustment procedure
1) RT1801: Set the reading of the voltmeter to
-20.0dBs+0.5dBs.
Notes:
. MTS sound signal generator settings:
Audio frequency: 300Hz
Modulation signal:L+R
Monitor TV settings:
1) Press the "GUIDE" button of the remote control to
'
display the munu on.the monitor TV screen.
2) Press 2 of the remote control.
3) Press 6 of the remote control to select the SAP
option and switch it from OFF to ON.
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