m) VCO Fine L1( 0 ... 127 )
The VCO status bar at the bottom of the screen appears only if either VCO
Coarse item or VCO Fine item is selected. The VCO status is read from the
Read register of STV2248 and guides whether to Increase / Decrease the
VCO registers to attain VCO OK Status.
For doing VCO adjustment , Feed a 38.9MHZ Carrier as IF input and adjust
VCO Coarse and fine parameters to get VCO OK Status.
If the cursor is in VCO Coarse or Fine , and the display shows VCO OK
status, then pressing of “MENU” key will automatically put VCO fine to the
Centre of the +60 to -60 KHz window.
For doing VCO L1 adjustment ,Feed a 33.9 MHZ carrier as IF input and
adjust VCO Coarse L1 and VCO Fine L1 to get VCO OK Status.
If the cursor is in VCO Coarse L1 or Fine L1 , and the display shows VCO
OK status, then pressing of “MENU” key will automatically put VCO fine for
L1 to the Centre of the +60 to -60 KHz window.
When in Service-2 menu ,if “OK” key is pressed , Service-3 menu appears
and the display is as follows.
The parameters controlled in the Service-3 menu are :
a) V SAW 50 ( 0 ... 63 )
b) V SAW 60 ( 0 ... 63 )
c) V SH ( 0…31 )
d) V SC ( 0…15 )
e) V CC ( 0…15 )
f) EW VDC ( 0…31 )
g) EW AMP ( 0…31 )
h) EW SHAPE ( 0…31 )
i) EW TRAP ( 0…31 )
When in Service-3 menu ,if “OK” key is pressed , Service-4 menu appears
and the displayis as follows:
AGC Gain ( 00 ... 03 )
Option 1 ( 50 )
Option 2 ( 00 )
Option 3 ( 06 )
Option 4 ( 27 )
Option 5 ( 00 )
ST Text ( 00 ... 15 )
H POS OSD ( 001 ... 255 )
V POS OSD ( 01 ... 63 )
H POS TXT ( 001 ... 255 )
V POS TXT ( 01 ... 63 )
By pressing “PP” key in Service mode ,we come out of Service mode.
