Table of Contents
Advertisement
7-2-15 Invariable Contrast, Brightness Control
Refer to 7-2-18 Key Check.
(Contrast, Brightness)
2
I
C check (7-2-13)
Yes
Does IC101's output
(Pins 18, 21 and 23) vary, pressing
15
cont, brit key?
Yes
Does IC102's output
(Pins 1, 3 and 5) vary, pressing
16
cont, brit key?
Yes
Check and replace Q101R, Q101G,
Q101B, Q102R, Q102G, Q102B,
Q103R, Q103G, Q103B.
CHA42*7L/5**7L
No
Replace IC101.
No
Replace IC102.
7 Troubleshooting
WAVEFORMS
15
3.16 V (IC101, #21)
CH1 P-P = 3.16 V
CH1 RMS = 1.008 V
43.2 V (IC102, #3)
16
CH1 P-P = 43.2 V
CH1 RMS = 63.56 V
7-17
Advertisement
Table of Contents
