27
ADJUSTMENT
IF Alignment:
Test equipment:
a.
45.75MHz sweep generator
b.
15V/3A DC power supply (with short and over current proof)
c.
Digital multi-meter
d.
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
Signal, Power Supply Connection:
a. Connect a +15V 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.
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.
Main power adjustment:
Adjustment: Connect a voltage meter to +B on main PCB. Ensure the +B voltage is
109V±0.3V
Summary of Contents for TV-8888-30
Page 3: ...3 PRODUCT CODE EXPLANATION AND SERIES INTRODUCTION ...
Page 14: ...14 NET DIMENSION 13 8 13 1 14 4 ...
Page 15: ...15 PARTS AND FUNCTIONS ...
Page 16: ...16 REMOTE CONTROLLER FUNCTION ...
Page 23: ...23 CIRCUIT BLOCK DIAGRAM ...
Page 24: ...24 PCB ...
