Samsung CKA4217L Service Manual page 30

6 Troubleshooting
6-3 No Raster
Does the drive pulse appear
23
at Pin 26 of IC401?
Yes
Does the drive pulse
appear at the collctor of
25
Q403?
Yes
Does the drive output
pulse appear at the base
26
of Q402?
Yes
Check flyback pulse at the
27
collector of Q402 connection of
CN502 and its related circuits
(D403, D409 and T501)
6-2
No
Check the horizontal drive
circuits. (IC401)
No
Check Q403 and T401
No
Check its related circuits
(R414 and C411)
WAVEFORMS
23 4.76 V (IC401, #26)
CH1 P-P = 4.76 V CH1 RMS = 3.652 V
25 29.4 V (Q403, Collector)
CH1 P-P = 29.4 V CH1 RMS = 13.16 V
26 10.4 V (Q402, Base)
CH1 P-P = 10.4 V CH1 RMS = 1.384 V
27 1.104 kV (Q402, Collector)
CH1 P-P= 1.104 kV CH1 RMS = V
CKA42*7L/5227L