Panasonic WJ-FS616 Service Manual page 25

8
If not, change the Capacitor (C958) while referring to Fig.
4-1.
8
Change the probe of the Oscilloscope from TP29 to TP39.
8
Execute Program Number 099 Press the Camera
Selection Button/Preset Position Button 9, 9 and 16
sequentially.
8
Make sure that the DC voltage at TP39 is between + 1.5 V
and + 3.5 V.
8
If not, change the Capacitor (C483) while referring to Fig.
4-1.
DC
Voltage
+ 2.0 V
Smaller 8 pF Larger
Value of Capacitor
8
Press the Reset Button.
(2). SC Lock Adjustment
Test Point: TP35 (SC LOCK-1)
TP36 (SC LOCK-2)
Adjust: C936 (SC LOCK-1)
C278 (SC LOCK-2)
8
Supply the Colour Bar signal to the Gen-Lock Input
Connector on the Rear Panel.
8
Connect the Oscilloscope to TP35.
8
Execute Program Number 097 Press the Camera
Selection Button/Preset Position Button 9, 7 and 16
sequentially.
8
Make sure that the DC voltage at TP35 is between + 1.5 V
and + 3.5 V.
8
If not, change the Capacitor (C936) while referring to Fig.
4-2.
8
Change the probe of the Oscilloscope from TP35 to TP36.
8
Execute Program Number 099 Press the Camera
Selection Button/Preset Position Button 9, 9 and 16
sequentially.
8
Make sure that the DC voltage at TP36 is between + 1.5 V
and + 3.5 V.
8
If not, change the Capacitor (C278) while referring to Fig.
4-2.
Capacitor to be changed.
Part Number Description
YF400060CHDT 6 pF (Smaller)
YF400070CHDT 7 pF
YW400080CHJT 8 pF (Typical)
YW400090CHDT 9 pF
YF400100CHJT 10 pF (Larger)
Fig 4-1
Switch Board
Switch Board
Switch Board
Switch Board
DC
Voltage
+ 2.0 V
Smaller 4 pF
Value of Capacitor
8
Press the Reset Button.
(3). FSC Frequency Adjustment
Test Point: TP50 (FSC)
Adjust: VR37 (FSC)
8
Disconnect all input signals from the WJ-FS616.
8
Connect the Frequency Counter to TP50.
8
Adjust VR37 to obtain 13.500000 MHz ± 20 Hz.
8
Connect the Oscilloscope to TP50 and confirm that the
DC voltage at TP50 is between + 1.5 V and + 3.5 V.
(4). Timing Adjustment
Test Point: Recording Output Connector
TP73 (TIMING)
Adjust: VR1 (TIMING-1)
VR2 (TIMING-2)
8
Connect the Oscilloscope to TP73 on the Switch Sub
Board.
8
Adjust VR1 so that the Rising Edge of the Timing Pulse
becomes 2H before the Start of the Video signal as shown
Fig. 4-3.
Video
Output
Signal
TP73
8
Adjust VR2 so that the Falling Edge of the Timing Pulse
becomes 8H before the End of the Video signal as shown
Fig. 4-4.
22
Capacitor to be changed.
Part Number
YF400020CHDT 2 pF (Smaller)
YF400030CHDT 3 pF
400040CHDT 4 pF (Typical)
YW400050CHJT 5 pF
YF400060CHDT 6 pF (Larger)
Larger
Fig 4-2
Switch Board
Switch Board
Switch Sub Board
Switch Sub Board
Switch Sub Board
2H before the start
of Video signal
Fig 4-3
Description
Rear Panel