Sony GV-A500E, Service Manual, Page: 95 / 127

5-36
3-6. AUDIO SYSTEM ADJUSTMENT
• Perform the adjustment using the color bar signal as a video
signal input for VIDEO terminal.
• The items to be adjusted for the R channel will be indicated
within the [ ], in regard to the adjusting items to be adjusted for
both L and R channels.
• Set the Hi-Fi sound switch in the menu display to “STEREO”
position unless specified otherwise.
Note :
1) When inputting the audio signal, input the same signal to both
the L and R channels, unless specified otherwise.
2) Be sure to insert the plug (Shorting plug or dummy plug, etc)
into the AUDIO terminal (Right). If the plug is not inserted,
the monaural mode well be set, and correct adjustments can
not be carried out.
[Monaural mode]
During recording ··········· REC AFM RF 1.7MHz carrier will
not be output.
During playback ············ The L+R signal will be output from
the AUDIO terminal (Left).
[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments in addition to the
video system measuring instruments as shown in Fig. 5-3-25, and
perform adjustments at the power switch [VTR] or [PLAYER]
position.
[Adjustment Procedure]
1) 1.5 MHz deviation adjustment
2) 1.7 MHz deviation adjustment
3) BPF adjustment
Audio
oscillator
600
Ω
Attenuator
Pattern generator
Video output
(75
Ω
)
600
Ω
: 270
Ω
(1-249-410-11)+330
Ω
(1-249-411-11)
Main unit
VIDEO
L
R
AUDIO
Main unit
VIDEO
AUDIO
L
R
TV monitor
47k
Ω
: 1-249-437-11
47k
Ω
Audio level meter
distortion meter
TP33(GND)
TP32(R OUT 1)
B
TP31(L OUT 1)
A
TP30(R OUT 2)
TP29(L OUT 2)
CN1
CN2
J3
J1(R)
J2(L)
S2
PAL NT
INV SIN
S3
S1
ST
BIL
CH1
CH2
TP27
(GND)
TP28(DC)
+
-
(J-6082-312-A)
AFM DEV jig
TP2(R OUT)
B
TP1(GND)
TP3(L OUT)
A
CPC
A
: 1.5MHz deviation adjustment.
B
: 1.7MHz deviation adjustment.
CN1
CN2
4
7
6
CN207
3
(RF SWP)
5
(REG GND)
8
(REC AFM)
Regulated power supply
(+7Vdc to +9Vdc)
Oscilloscope
Red
White
White
Red
L
R
CN207
To Audio terminal
VC-197 board
A B
Fig. 5-3-24.
In Recording
In Playback
When connecting AFM DEF jig