25VT-K100
25VT-CK10
18
FLOW CHART NO.2-4
NO PICTURE, NO SOUND
Check
the
IC401
and
adjacen
t parts.
Check the IC401 and
adjacent parts.
Check the Q431
and adjacent parts.
Check the CRT
connector K1~K5 and
adjacent parts.
IC401 pin (22) bias
check.
IC501 (TA8403) bias
check.
R511, D502, C509,
C510
Vertical freq check
CF631 (503kHz)
Normal
Abnormal
IC401
Abnormal
Abnormal
Normal
Normal
NO
FLOW CHART NO.2-3
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO Sound
NO Picture
NO
NO
NO
NO VERTICAL SCAN
Circuit to be checked:
1. TUNER
2. PIF
3. Automatic gain control
4. 9V power source
Check the IC401 and adjacent parts
Check IC2001.
Check the Tuner AGC.
Check
the
IC351.
Does the noise level increase at max,
Contrast, Brightness, and Sound Control ?
Is there a signal at pin
(43) of IC401 ?
noise increases but no
signal is received
Is there a signal at pin
(41) of IC401 ?
Picture noise
decrease but sound
level varies greatly.
Check the tuner bias.
Normal
Abnormal
Abnormal
Check the
IC401.
Normal
Check the
Tuner circuit.
Abnormal
Check the
PC9V line.
Normal
Check the
IC401.
Does the 9V (+B)
appear at pin (48)
of the IC401 ?
Is there a signal at
pin (37) of IC401 ?
Is there a signal at
pin (53) of IC401 ?
Is there
a signal
at pin
(8) & of
IC351
(TDA
7233) ?
Is there
a signal
at pin
(5) of
IC351 ?
Check
the
speaker.
Check
the
IC401,
and
adjacent
parts.
Is there
a signal
at pin
(54) of
IC401 ?
Summary of Contents for 25VT-CK10
Page 7: ...25VT K100 25VT CK10 7 LOCATION OF USER S CONTROL ...
Page 21: ...25VT K100 25VT CK10 21 H G F E D C B A 1 2 3 4 5 6 MODEL 25VT K100 PWB A MAIN UNIT ...
Page 22: ...25VT K100 25VT CK10 22 H G F E D C B A 1 2 3 4 5 6 MODEL 25VT CK10 PWB A MAIN UNIT ...
Page 29: ...H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 25VT K100 25VT CK10 25VT K100 25VT CK10 35 36 ...
Page 31: ...H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 25VT K100 25VT CK10 25VT K100 25VT CK10 40 39 ...
Page 55: ...25VT K100 25VT CK10 71 Memo ...
Page 56: ...25VT K100 25VT CK10 72 TQ0452 S YO IK Printed in Japan ...
