Audio System Adjustment; Hi-Fi Audio System Check; E-E Output Level Check; Overall Level Characteristics Check - Sony SLV-999HF Service Manual

2-5.

AUDIO SYSTEM ADJUSTMENT

[Connecting Instruments]
AUDIO LINE OUT L and R
AUDIO LINE-1
IN L and R
Audio
oscillator
600 Ω
Attenuator
Fig. 6-2-8
2-5-1.

Hi-Fi Audio System Check

1. E-E Output Level Check

[Adjustment purpose]
Confirm that the E-E audio output level is within the specification.
Mode E-E
Signal 400 Hz, –7.5 dB
Measurement Point AUDIO LINE OUT terminal L and R
Measuring Instrument Audio level meter
Specified Value –7.5 ± 2 dBs
Switch setting:
INPUT SELECT ........................................................................ L1
[Check method]
1) Input a 400 Hz, –7.5 dBs signal to both L and R channels of
AUDIO LINE-1 terminal.
2) Check that the audio output signal satisfies the specified value.

2. Overall Level Characteristics Check

[Adjustment purpose]
Confirm that the level characteristic is within the specification.
Mode Recording and playback (SP mode)
Signal 400 Hz, –7.5 dBs
Measurement Point AUDIO LINE OUT terminal L and R
Measuring Instrument Audio level meter
Specified Value –7.5 ± 2 dB
Switch setting:
INPUT SELECT ........................................................................ L1
[Check method]
1) Input a 400 Hz, –7.5 dBs signal to both L and R channels of
AUDIO LINE-1 terminal.
2) Record the signal in the SP mode.
3) Playback the recorded section.
4) Press the AUDIO MONITOR button of the remote commander
and select the stereo audio mode (STEREO indicator on the
display window turns on.).
5) Check that the 400 Hz signal level satisfies the specified value.
Audio level meter
or distortion meter
47 k Ω
VTR
2-5-2.

Normal Audio System Adjustment

• Make adjustment in the SP mode unless otherwise specified.
• Use a normal VHS cassette tape for adjustment.

1. ACE Head Adjustment

Refer to the VHS mechanical adjustment manual
MECHANISM) (9-921-647-11).

2. Frequency Response Check

[Adjustment purpose]
Confirm that the frequency characteristics are within the
specification.
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Note: Perform "E-E Output Level Check" of "Hi-Fi Audio System Check"
before this adjustment.
Switch setting:
INPUT SELECT ........................................................................ L1
[Check method]
1) Input a 400 Hz, –27.5 dBs signal to both L and R channels of
AUDIO LINE-1 terminal.
2) Record the signal in the SP mode.
3) Input a 7 kHz, –27.5 dBs signal to both L and R channels of
AUDIO LINE-1 terminal.
4) Record the signal in the SP mode.
5) Playback the recorded section.
6) Press the AUDIO MONITOR button of the remote commander
and select the normal audio mode (STEREO indicator on the
display window turns off.).
6) Check that the 7 kHz signal level against to the 400 Hz signal
level satisfies the specified value.
6-5
Recording and playback (SP mode)
1 : 400 Hz, –27.5 dBs
2 : 7 kHz, –27.5 dBs
AUDIO LINE OUT terminal L or R
Audio level meter
0 ± 3 dB
(S