JVC AV-2771S Service Manual page 31

Measuring
AV-2771S
Description
e PIP CIRCUIT
READ CLOCK
adjustment
WRITE CLOCK
INTERVAL
adjustment
ENCODER COLOR
SYNCHRONI-
ZATION
adjustment
Test point
R.CK transformer
(T7000)
Frequency
counter
W.CK trimmer
capacitor
(C079)
Pattern
generator
Oscilloscope
(H-rate 10:1)
Remote control
unit
ENCODER
COLOR SYNC.
trimmer capacitor
(C012)
Pattern
generator
Oscilloscope
(H-rate 10:1)
vR004
D/A CONVERTER
R-Y
ee eee VROOS
TP-D3_ TP-D11 [DECODER
@@®@ Bcoror [ []
7]
TP-D10 @
Tp. TP
Da © TP-D7
1c003 © ioe
TP-Dg ell
VR007
co12 (©)
ENCODER
COLOR SYNC.
5] vrooz
@ 1P-02
. Use shorting clips or other means to short TP-D12
to the 5¥ line.
. Connect the frequency counter to TP-D13. Adjust
R.CK transf. to obtain 30.2MHz + 10kHz.
. Receive the crosshatch signal to both TV(antenna)
and VIDEO input.
. Set for the PIP mode.
. Connect the oscilloscope to TP-D8. Adjust W.CK
trimmer capacitor to interval "a" in figure to
1.2+0.2ps.
. Receive the color bar signal.
. Set for the PIP mode.
. Use shorting clips or other means to short TP-D1 to
TP-D14.
. Adjust ENCODER COLOR SYNC trimmer capa-
citor until when the color changes from strip pattern
to color bar and almost stands still.
. Remove the connection between TP-D1 and TP-
D14.
. Check that when the channel is changed and return
to color bar, it immediately catches without color
synchronization being destroyed.
FRONT
"a
PIP PCB ASS'Y
(No.50577) 31