Sharp VT-G14 - Page 66

66
VT-G14
VT-G21
Circuits to be checked:
» IC801 and its Adjacent Circuit
» R. G. B. Output Circuit
FLOWCHART NO. 2-10
NO SPECIFIC COLOUR (PAL)
NO
NO
YES
YES
YES
NO
Is there a chroma signal
at pin (42) of IC801 ?
Check IF Circuit and
adjacent parts.
Is the white balance
properly adjusted ?
Is some colour
produced in B/W
broadcast reception ?
Readjust the white
balance.
The picture colour is
green or magenta.
Check Q1801 and its
adjacent circuits.
(Q1802 for VT-G14)
The picture colour is
red or cyan.
Check Q1802 and its
adjacent circuits.
(Q1801 for VT-G14)
The picture coloour is
blue or yellow.
Check Q1803 and its
adjacent circuits.
IC801
X801 (16.2MHz)
Specific colours are not produced in
colour broadcast reception.
Circuits to be checked:
» IC801 and its Adjacent Circuit
» R. G. B. Output Circuit
FLOWCHART NO. 2-11
NO SPECIFIC COLOUR (SECAM)
NO
NO
NO
NO
NO
YES
YES
YES
YES
Is there a chroma signal at pin
(42) of IC801 ?
Specific colours are not produced in
colour broadcast reception.
Is some colour produced in B/W
broadcast reception ?
When change channel
does colour appear ?
Colour appears but
colour shading.
NO
NO
YES
When colour control minimum,
colour disappears.
Check IF Circuit and
adjacent parts.
Is the white balance
properly adjusted ?
YES
YES
IC801
Colour appears but
abnormal colour.
NO
(Abnormal)
YES
(Normal)
Does colour appear when
colour system is SECAM ?
IC801
Check the VCR.
Does the voltage 1.5V
appear at pin (5) of
IC7701 in receiving
SECAM broadcast ?
Check IC7701, IC1001,
signal line of serial datas,
serial clock and ready (L)
between them.
Roster is
coloured red or
cyan.
Check Q1802
and its adjacent
parts.
(Q1801 for VT-
G14)
Roster is
coloured green
or magenta.
Check Q1801
and its adjacent
parts.
(Q1802 for VT-
G14)
Roster is
coloured blue
or yellow.
Check Q1803
and its adjacent
parts.
Check IC2201
and SECAM
det. (H) line.
Readjust the
white balance.