Sharp 37GT-27H (serv.man16) Service Manual ▷ View online
33
37GT-27H
NO SOUND
Check Sound setting by
R/C. Signal should be
received.
NO
YES
Check D707, C710
NO
Is
Audio Amplifier
muted?
Check R304, Q301, Q302
NO
Check IC801, C301
YES
YES
Check IC1001, Q305
Does
Sound Signal
appear at Pin(6)
of IC801?
Does
approx. 20V DC
appear on
C710?
34
37GT-27H
NO RASTER
Check F701
Normal
Fuse Blown
Normal
Replace Fuse
Fuse Blown
again
Check IC701
Normal
Abnormal
Check Q601,
C711
Check D708, D717
Normal
Check R705, R706,
R715, D706
R715, D706
Normal
Check CRT connector
K1... K5 bias
Normal
Abnormal
Check C878
Check IC801
Check Q601, C711
Check Voltage on C705
(Approx. 325V DC)
Check D701, D702, D703,
D704, C705.
Check Voltage on C711
(Approx. 105V DC)
Approx. 0V
35
37GT-27H
NO VERTICAL SCAN
YES
NO
Check D709, D710, IC501
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Readjust Vertical Size.
Check D505, D506
Check Q505, Q507, Q509
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
Check IC801, C815, C816, R818
Vertical size is abnormal
Vertical linearity is abnormal
Is IC501
bias normal?
Check R510, Q501,
Q502, Q503
36
37GT-27H
NO SPECIFIC COLOUR
Is
some colour
produced in B/W Broadcast
reception?
YES
NO
Check IC801, C812,
C813, R813, X801
Is
the white
balance properly
adjusted?
YES
NO
Readjust The White
Balance.
The Picture Colour is
Blue or Yellow.
The Picture Colour is
green or magenta.
The Picture Colour is
Red or cyan.
Check Q871, Q883 and
their adjacent circuits.
Check Q870, Q885 and
their adjacent circuits.
Check Q872, Q887 and
their adjacent circuits.
UNLOCKED COLOUR
(NO COLOUR SYNCHRONIZATION)
Check setting of Colour
Standard in Service
Mode.
Normal
Check IC801, C812,
C813, R813, X801
Click on the first or last page to see other 37GT-27H (serv.man16) service manuals if exist.