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5 Troubleshooting
5-8 DP15H*/DP17L*
5-1-15 Dynamic Focus Failure
IC401 Pin 32 output is right?
Some parts around Q551 are right?
Replace failed part.
Yes
Yes
No
Replace the IC401.
No
T502 Pin 6 input is right?
Check and replace C432.
Yes
No
T502 Pin 1 output is right?
Replace the T502.
No
No
Check the connection between FBT
Focus pin, CRT Socket PCB.
WAVEFORMS
13
14
12
12
2.00 V (IC401, #32)
CH1 P-P = 2.00V CH1 RMS = 6.124V
13
50.0 V (T502, #6)
CH1 P-P = 50.0V CH1 RMS = 75.6V
14
100 V (T502, #1)
CH1 P-P = 100V CH1 RMS = 124.0V