Table of Contents
Advertisement
7-2-6 Invariable H_Size
Are Q410 and D408 OK?
Yes
Does the PWM duty of IC202's Pin
18 vary, pressing H_Size button?
No
Is paravola waveform on
8
IC401's Pin 24?
Yes
Check and replace Q408, Q409, L402.
7-2-7 Abnormal H_Size
Check if R444 and R434 are right
as CRT differential items?
Does PWM duty of IC202's
Pin 22 vary with different timings?
(Low freq. : narrow duty
High freq. : wide duty)
Yes
Does the FBT B+ voltage on T501's
Pin 2 vary with different timings?
Yes
Adjust horizontal minium size with
softjig. (Refer to 6-2-1)
CHA42*7L/5**7L
No
Replace it.
Yes
Is Q409 OK?
Replace IC202.
No
Replace IC401.
No
Check and replace IC202 and some
parts around it.
No
Refer to 7-2-12 High Voltage Failure.
No
No
7 Troubleshooting
Check and replace
Q409.
WAVEFORMS
8
1.12 V (IC401, #24)
CH1 P-P = 1.12 V
CH1 RMS = 3.094 V
7-11
Advertisement
Table of Contents
