A
LOGO2 ON SIZE 2*2
LOGO1 ON SIZE 2*2 H.POS 20 COLOR RED
H.POS 20 COLOR RED V.POS 40
V.POS 30
A
Maintenance adjustment
1 AdjB voltage
1.1 testing point---------two ends of C561
1.2 if +B voltage won't meet the requirement, adjust RP551 level switch to make it comply with the
requirement.
14’’
110V (CAIHONG picture tube )
21’’
110V (CAIHONG picture tube )
25’’
125V/130V (CAIHONG/HUAFEI picture tube )
29’’
125V (YONGXIN picture tube )
2 Picture/AFT IF coil T101 adjustment
2.1 Input the 38MHZ/38.9MHZ/45.75MHZ point frequency signal (input level 80db+5db from C110
terminal.
2.2 Connect the digital voltage meter to the cross-point of R113 and R114.
2.3 Adjust T101 till the reading on the voltage meter is 3.6V+0.02V.
3 RF—AGC adjustment
3.1 Receive Philips circular testing signal.
3.2 Adjust the signal input level to 60db+1db
3.3 Connect the digital voltage meter to TP-A.
3.4 Press the PROD factory button on the maintenance use remote controller to start adjusting mode.
3.5 Press CH+ button to select RF.AGC option. Use VOL+ to adjust the value of RF.AGC till the
reading on the voltage meter is 2.5V+0.1V
3.6 Press PROD Factory button till exit.
5 Vertical size adjustment
5.1 Receive Philips testing (PAL system) signal.
5.2 Press PROD factory button to start adjusting mode.
5.3 Press CH
±
button to select V.SIZE option use VOL
±
to adjust the value of V.SIZE till the
vertical overscan is 8%.
5.4 AV receive Philips testing (NTSC system) signal.
5.5 Press CH
±
button to select NT.V.SIZE function. Use VOL
±
to adjust the value of NT.V.SIZE till
the vertical overscan is 8%
5.6 Press PROD factory till exit.
6 Vertical center adjustment
6.1 Receive Philips circular testing signal (PAL system).
6.2 Press PROD(factory) button on the maintenance use remote controller to start adjusting mode.
6.3 Press CH
±
button to select V.POSI option. Use VOL
±
to adjust the value of V.POSI till the picture is
