Static Convergence Compensation Circuit Failure - NEC DPro2070SB Service Manual

3.4.6 Static Convergence Compensation Circuit Failure

Adjust the static convergence by OSM control.
NG
Confirm that the voltage (DC level) at Pins 3 (H-STA) and 4 (V-STA) of IC8A1 on the MAIN PWB
is variable within the range of 0 to 5V by OSM control.
NG
OK
(H-STA) Confirm that the output voltage at Pin 1 of IC8A1 is variable by OSM control.
(V-STA) Confirm that the output voltage at Pin 6 of IC8A1 is variable by OSM control.
NG
OK
(H-STA) The horizontal static convergence coil of Pins 1 and 2 of CN8A1
(V-STA) The vertical static convergence coil at Pins 3 and 4 of CN8A1
Replace the DY (deflection yoke) if the horizontal or vertical static convergence coil has been
found to be failure.
Expected failure point
IC6A2 or IC6A3
Expected failure point
IC8A1，R8A2 or R8B7
Expected failure point
OK
Good
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