Sharp 27DV-S100 Service Manual page 65

Video recoding (luminance) failure.
NO
Is there signal at pin
Is there signal at pin
(30) of IC2201? (41) of IC1301?
YES YES
Check the
Check the line
tuner/IF circuit
between pin
(TU261) or
(41) of IC1301
J405, J401
and pin (30) of
and their
IC2201.
peripheral
parts.
Is 5V voltage applied
NO at pins (12), (36),
Is there signal at pin
(38), (40), (41), (43),
(52) of IC2201?
(61), (67), (90) and
YES (96) of IC2201?
YES
Are there the
Check the
I2C clock and
YC5V line.
data signals at
pins (62) and
(63) of
IC2201?
YES NO
Check the line
Replace
IC2201. between pins
(62)/(63) of
IC2201 and
pins (57)/(56) of
IC2001.
Is there the luminance
NO
input signal (about 0.5Vp-
p) at pin (19) of IC2201?
YES
NO
Is there the luminance
NO
input signal (about 0.3Vp-
p) at pin (42) of IC2201?
YES
Is there the luminance
NO
input signal (about 0.5Vp-
p) at pin (26) of IC2201?
YES
NO
Is there the luminance
NO
input signal (about 0.5Vp-
p) at pin (23) of IC2201?
YES
NO
Are there the luminance
input and output signals
(about 0.5Vp-p) at pins
(13) and (14) of IC2201
respectively?
YES
SP mode: Are there the record FM output signals (about 20mAp-p) at pins (88), (89) and (SP1), as well as pins (86), (87) and (SP2) of IC2201?
EP mode: Are there the record FM output signals (about 20mAp-p) at pins (93), (94) and (EP1), as well as pins (91), (92) and (EP2) of IC2201?
Check the cylinder. Replace as required.
Check the line between Is 5V voltage applied at
pins (18) and (19) of
pin (61) of chroma power
IC2201. (Check C2206.)
terminal IC2201?
Check the line between
Is there the chroma input
pins (21) and (42) of
signal (about 143mVp-p
IC2201. (Check C2208.)
/Burst) at pin (46) of
IC2201?
Check the line between
pins (26) and (39) of
IC2201. (Check C2212.)
YES
Is there the luminance
Is there the chroma input
output signal (about 0.5Vp-
signal (about 180mVp-p
p) at pin (39) of IC2201?
/Burst) at pin (58) of
IC2201?
NO
Is 5V voltage applied at
pin (36) of CCD power
terminal IC2201?
YES
Make sure that the CCD
clock signal (about
7.16MHz/0.5Vp-p) is
applied from pin (69) to pin
(44) of IC2201.
Check the line between
pins (23) and (24) of
IC2201. (Check C2210.)
Check the peripheral
circuits of pins (13) and (14)
of IC2201. (Check R2201,
R2202 and C2203.)
YES
FLOW CHART No. 2-14
Recording possible, but no colors.
Check the peripheral
NO
circuits of pin (61) of
IC2201 and the YC5V line.
YES
Check the line between
NO
pins (46) and (60) of
IC2201. (Check C5512.)
YES
YES
Make sure oscillation
(3.58MHz) occurs at pins
(71) and (73) of IC2201.
Check the line between
NO
pins (35) and (58) of
IC2201. (Check R5505
and C5515.)
YES
YES
Is there the chroma
NO
output signal (about
180mVp-p/Burst) at pin
(35) of IC2201?
NO
Make sure that YC5V is applied at pin (90) of IC2201.