VL-PDl U
1. VCO free-run adjustment
Test point TL800 (HSY)
Address VCR ADJ 32
Mode
VCR AV input
Procedure
1) Change the VCR ADJ address 53 to FB.
2) Connect the Frequency counter to TL802 and adjust it to the specified rating with the VCR ADJ address
32
Adjustment
rating
Examples
3) Set the VCR ADJ address 53 to FF.
Note: Setting the address 53 to FC/FD turns off the LCD screen, but keep changing the data. Ot-herwise
the original screen will not come on again. In such case, the address and the data cannot be
checked on the LCD screen.
15734kHz + 1 OOHz
l During IC703(E2PROM) replacement.
l During IC801 replacement.
2. DAC full-scale adiustment
Test point
Address
Mode
Procedure
TL801 (R OUT) TL802 (G OUT) TL803 (B OUT) TL804 (C OUT)
VCR ADJ 3D (R) VCR ADJ 3E (G) VCR ADJ 3F (B) VCR ADJ 29 (C)
VCR AV input
1) Change the VCR ADJ addresses 46,57 and 69 to 7F, FE and 7F, respectively.
2) With the VCR ADJ address 3D, set the TL801 output voltage to the adjustment rating, and with the
oscilloscope, set the peak voltage also to the adjustment rating, in such a way that the both TP’s
voltages will be averaged into the rated mean value.
3) With the VCR ADJ address 3E/3F/29, set the TL802/803/804 output voltage to the adjustment rating,
and with the oscilloscope, set the peak voltage also to the adjustment rating. ((Same as in Step 2)
above)
Adjustment
rating
Examples
4) Set the changed address data back to normal.
Note: Setting each address data back to normal leaves the LCD screen white. At this time, turning off and
on the main power will restore the screen (the lithium battery should be removed).
1 .OOOVp-p + 1 OmV
1 .OOOV f 1 OmV
A ~
_A__
l During IC703(E2PROM) replacement.
l During IC801 replacement.
10-11
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