Normal Audio System Adjustment; Ace Head Adjustment; Frequency Response Check; E-E Output Level Check - Sony SLV-SE850 Service Manual

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
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/LP mode)
Signal SP mode :
1: 400Hz, –26.3dBs
2: 7kHz, –26.3dBs
LP mode :
1: 400Hz, –26.3dBs
2: 4kHz, –26.3dBs
Measurement Point LINE1 A(L) OUT (CN500 3 pin) or
LINE1 A(R) OUT (CN500 1 pin)
Measuring Instrument Audio level meter
Specified Value SP mode : 0 ± 3dB
LP mode : 0
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, –26.3dBs signal to both L and R channels of
AUDIO LINE 1 terminal.
2) Record the signal in the SP mode.
3) Input a 7kHz, –26.3dBs (SP mode), 4kHz, –26.3dBs (LP mode)
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.).
7) Check that the 7kHz (SP mode), 4kHz (LP mode) signal level
against to the 400Hz signal level satisfies the specified value.
(S
+4
dBs
–6
6-6E

2-6-2-3. E-E Output Level Check

[Adjustment purpose]
Confirm that the E-E audio output level is within the specification.
Mode E-E
Signal SF990 :
400Hz, –7.5dBs
SE850/SF900/SF950 :
400Hz, –6.3dBs
Measurement Point LINE2 (L/R) OUT (J500) or
LINE1 A(L/R) OUT (pins 1 and 3
of CN500)
Measuring Instrument Audio level meter
Specified Value LINE2 (L/R) OUT : –7.5 ± 2dBs
LINE1 A(L/R) OUT : –6.3 ± 2dBs
Switch setting:
INPUT SELECT ................................... L1
[Check method]
1) Input a 400Hz, –7.5dBs (SF900) and 400Hz, –6.3dBs (SE850/
SF900/SF950) to both L and R channels of LINE1 A(L/R) IN
of CN500 pins 2 and 6.
2) Check that the 400Hz signal E-E output level the specified
value.