Panasonic BT-M2090Y Service Manual page 33

ts 1-M~U~UY
ADJUSTING STEP
Item Test equipment Test points
Adjustment
Adjustment procedure
locations
B1 voltage
Voltmeter
TP-B1 R038 (B1 adj) 1. Set power supply voltage to 198 V.
check Variable TP-E [Power PBWJ 2. Set contrast and bright to minimum and produce
transformer a black screen.
3. Connect voltmeter between TP-B1 and TP-E.
Switch on power.
4. Adjust R038 (B1 adj) to set the B1 voltage to
85.0
±
0.2 V.
5. Set the power supply voltage to 264 V.
6. Check for 81 voltage of 85.0
±
0.2 V.
7. Return the contrast and bright controls to the
detent positions.
High voltage High voltage meter 1. Set the Ext Sync switch to Ext.
check Signal generator 2. Connect a synchronization signal to Ext Sync.
(All-black signal)
3. When the raster appears, reduce the bright
control.
4. Connect the high voltage meter to the anode
and check for 24.0 - 25.0 KV.
5. Return the Ext Sync switch to Int.
v.deflection Signal generator D02(NTSC V
•
Perform after purity adjustment.
center (Resolution pattern) SHIFT)
•
Adjust deflection yoke inclination.
[SERVICE MENU)
1. At service menu, set D02 to 32.
R416(V CENTER)
2. Adjust R416 (V phase) to align the picture
[Deflection PWBJ
center with the CRT center.
Screen Oscilloscope TP-SC R313 (SCREEN)
1. Connect oscilloscope to TP-SC.
Signal generator [Deflection PWBJ
2. Adjust R313 (Screen) to set the screen voltage
(Color bar) to 450
±
10 V.
Focus Signal generator FOCUS VR
1. Adjust the Focus VA for optimum focus where
(Resolution pattern) [HVTJ
moire is not apparent.
2. Darken the picture and and adjust the focus by
turning counter-clockwise from the position
where focus is poor.
3. Alternately repeat the above steps to obtain the
optimum position.
•
Focus can be adjusted easily by displaying the
menu.
H frequency
Signal generator
D06(H SHIFT)
1. At the service menu, set D06 to 32.
(Resolution pattern) [SERVICE MENU)
2. Set S501 (H Free SW) to Free.
S501
3. Adjust screen sync with R503 (H Hold).
(H FREE SW)
4. Set S501 (H Free SW) to Normal.
R503(H HOLD)
5. Change the signal, then return the previous
[Deflection PWBJ signal. Confirm absence of sync disturbance.
H center
Signal generator D06(H SHIFT}
1. At the service menu, set D06 to 32.
(NTSC)
(Resolution pattern) [SERVICE.MENU] 2. Adjust R582 (H Phase) to align the picture
R582(H PHASE) center with the CRT center.
[Deflection PWBJ
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