Toshiba CN27E90 Technical Training Manual page 108

(No RASTER)
1
NG
Check/Replace
F470, Q404
5
Is voltage at pin 22 (H-Vcc)
NG
2
Check peripherals of
start circuit Q430
and audio Vcc
6
3
NG
Check R920
Does heater light?
CRT Drive board
7
Check peripherals of
Q501 and video out
circuit
4
Red lights
Check F470
OK
of Q501 9V?
OK
OK
19
8
No RASTER
10
Is the status of power
LED?
Red blinks
13
Short R370 and turn
power on again
(See note below.)
15
Open R472 and turn
power on again
(See note below.)
Red blinks
17
Short R470 and turn
power on again
(See note below.)
Red blinks
Check protector module
Z801 and power circuit
Note: Do not take time, check within short time.
108
21
LED
Red blinks
Check peripherals of V.out
circuit Q301 and +27V line
22
LED
Check H. out circuit;
Red blinks
C440, C444 and X-RAY
protection circuit
(including Z801)
23
F470 blinks
Check main B line and
H. out circuit (Q404, 4T461)