Stereo Audio System Adjustment (Ccd-Tr917/Tr940/Tr940Pk); Mhz Deviation Adjustment (Vc-195 Board) - Sony Handycam CCD-TR57 Service Manual

3-6. STEREO AUDIO SYSTEM ADJUSTMENT
(CCD-TR917/ TR940/ TR940PK)
• 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 carriear will
During playback ................ The L+R signal will be output from
In Recording
Pattern generator
Video output
(75 Ω )
Audio
oscillator
Attenuator
600 Ω (270 Ω (1-249-410-11) + 330 Ω (1-249-411-11))
In Playback
Main unit
VIDEO
L
AUDIO
R
47k Ω : 1-249-437-11
not be output.
the AUDIO terminal (Left).
Main unit
VIDEO
L
600 Ω
AUDIO
R
Audio level meter or
distortion meter
47k Ω
47k Ω : 1-249-437-11
TV monitor
[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. 5-3-22, 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
When connecting AFM DEV jig.
Stabilized power supply
(+7Vdc to +9Vdc)
+
-
TP27
(GND)
Oscilloscope
TP28 (DC)
CH1
CH2
Red
J1(R)
White
J2(L)
TP1(GND)
TP2(R OUT) B
TP3(L OUT) A
To Audio terminal
White
L
Red
R
A : 1.5MHz deviation adjustment.
B : 1.7MHz deviation adjustment.
Fig. 5-3-22.
5-48
B A
AFM DEV jig
INV SIN (J-6082-312-A)
S3
TP33(GND)
TP32(R OUT 1) B
S2
TP31(L OUT 1) A
PAL
TP30(R OUT 2)
TP29(L OUT 2)
S1
TP26
J3
TP24 TP25
CN1
CN2 CN1
Use the CPC-7 jig
(J-6082-382-A)
µ
0.01 F
(1-101-004-00)
@ª
IC301
(REC AFM)
!¡
CN910
(RF SWP)
8
CN910
(GND)
VC-195 board
NT
ST
BIL
PIN
PIN
PIN