-
22
-
- Apply the all mode signal with a crosshatch pattern.
- Set the H-Size to the best <270mm for 15”, 300mm for 17”, 350mm for 19”,
317mm for ET17 Atronic (mode 4) and ET17 Bally (mode 1~7) , 356mm for ET19
Bally (mode 1, 7) , 358mm for ET19 SEGA (mode 8,9)>, the V-Size to the best
(202mm for 15” , 225mm for 17”, 262mm for 19”, 237mm for Atronic (mode 4)
and ET17 Bally (mode 1~7) model., 264mm for ET19 Bally (mode 1~7) model,
268mm for ET1988C SEGA (mode 8,9) model). Check all mode if the size is off by
+/- 5mm, the phase +/- 2mm , the pinc0.5mm and -2mm range, Ro/-
1mm, Linearity under7 %.
7-7 Power Saving Test:
-Off Mode:Open the H-Sync and V-Sync, check if the power is under 5W.
8. CONVERGENCE ADJUSTMENT
The CRT is an ITC assembly, however, here is the explanation for readjustment just in
case.
8-1
Make sure that this adjustment is done later than 30 minutes after power on.
Check general ability coarse adjustment and purity adjustment finished.
8-2
Degauss the magnetism of chassis and CRT with degaussing coil. (CRT board also).
8-3
Apply mixed crosshatch signals of red and blue from the signal generator. Nudge the
deflection yoke to equal its inclination up and down, right and left with a temporary
wedge between CRT and the top of the yoke.
8-4 Match the red and blue images at the center of the screen by rotating the Four-pole
magnet A (See STEP-1 in figure for examples). For this adjustment Four-pole
magnet A should be put together.
8-5
Apply mixed crosshatch signal of red, blue and green from the signal generator.
8-6
Match the red, green and blue images at the center of the screen by rotating the Six-
pole magnet. (See STEP-2 in figure for examples).
8-7
If lines are twisted either left hand or right hand (See the STEP-3 in figure for
examples) perform the following:
a.
Use Four-pole magnet B to shift convergence of horizontal lines by 5 to 6 mm at
the center of the screen. (For twisted left hand lines, shift blue line downward and
red line upward. For twisted right hand lines, shift red line downward and blue line
upward. Do not shift convergence of vertical lines.)
b.
Then realign convergence with Four-pole magnet A.
8-8 Loosen the deflection yoke fastening screw and gently nudge the yoke up and down
to achieve the best overall convergence on the edges of the screen (See STEP-4 in
figure for examples).
Insert wedge at the top of the deflection yoke so that the convergence will not
deviate due to an unsteady deflection yoke.
8-9 Gently nudge the yoke from side to side to achieve the best overall convergence on
the edges of the screen (See STEP-5 in figure for examples).
Insert wedges at the left side and right side of the deflection yoke so that the
convergence will not deviate due to an unsteady deflection yoke. (Do not apply
silicon adhesive to the wedges to prevent them from slipping out).
