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24
13. Adjustment
l
IF alignment:
1). Test equipment:
a.
45.75MHz sweep generator
b.
15V/3A DC power supply (with short and over current proof)
c.
Digital multi-meter
d.
If alignment tool
f.
User Remote controller
g.
Service remote controller
h.
Video signal generator
i.
Multi-system adjustment tool
j.
60MHz double trace oscillograph(2 units)
k
. White balance adjustment instrument
2). Signal, power supply connection:
a.C15V DC power supply to the +15V testing top in the main PCB.
b.Input sweep signal into IF testing top
c.Connect multi-meter to PIF-TP testing top in PCB.
3). Alignment
a.Connect 45.75MHz sweep generator to IF test top in PCB
b.Adjust T101 and make digital multi-meter display 3.6V
±
0.05V.
(PIF-TP top can only connect to multi-meter).
Alignment and check:
a. Connect main PCB with alignment tool, input factory adjustment signal, and turn TV
on. Adjust screen control on FBT and make screen brightness relevant
,
receive 525-line
monoscope, adjust focus control on FBT and make focus relevant.
b. Pre-adjust power voltage: adjust RP551 and make +B voltage be 109V
±
0.5V.
c. Check brightness, contrast, color, and sharpness: receive color bar signal and adjust
contrast, brightness, color, sharpness control, picture will change accordingly.
optimal
。(
see figure
Adjustment
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