Sony RMT-V259D, Service Manual

Page: 89 / 118

6-6E
2-6-2. Normal Audio System Adjustment
• Make adjustment in the SP mode unless otherwise specified.
• Use a normal VHS cassette tape for adjustment.
2-6-2-1. ACE Head Adjustment
Refer to the VHS mechanical adjustment manual (S
MECHANISM) (9-921-647-11).
2-6-2-2. Frequency Response Check
[Adjustment purpose]
Confirm that the frequency characteristics are within the
specification.
Mode Recording and playback (SP mode)
Signal
1
: 400Hz, –27.5dBs
2
: 7kHz, –27.5dBs
Measurement Point LINE1 A(L) OUT (CN500
3
pin) or
LINE1 A(R) OUT (CN500
1
pin)
Measuring Instrument Audio level meter
Specified Value 0 ± 3dB
Note: Perform “E-E Output Level Check” of “Hi-Fi Audio System Check”
before this adjustment.
Switch setting:
INPUT SELECT ................................... L2
[Check method]
1)
Input a 400Hz, –27.5dBs signal to both L and R channels of
AUDIO LINE 2 terminal.
2) Record the signal in the SP mode.
3) Input a 7kHz, –27.5dBs signal to both L and R channels of
AUDIO LINE 2 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.).
7) Check that the 7kHz signal level against to the 400Hz signal
level satisfies the specified value.