Sony RMT-V267B, Service Manual

Page: 69 / 91

6-5
2-5. AUDIO SYSTEM ADJUSTMENT
[Connecting Instruments]
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 LINE OUT L and R
AUDIO LINE-1
IN L and R
Audio
oscillator
Attenuator
600
Ω
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 (S
MECHANISM) (9-921-647-11).
2. Frequency Response Check
[Adjustment purpose]
Confirm that the frequency characteristics are within the
specification.
Mode Recording and playback (SP mode)
Signal
1
: 400 Hz, –27.5 dBs
2
: 7 kHz, –27.5 dBs
Measurement Point AUDIO LINE OUT terminal L or R
Measuring Instrument Audio level meter
Specified Value 0 ± 3 dB
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.