Sharp 21KF-80 (serv.man13) Service Manual ▷ View online
37
21KF-80H
NO VERTICAL SCAN
Check IC501, the connectors
F4
and F5, and adjacent
Check IC501 bias.
Check D501,D505,C502 and C514
NO SPECIFIC COLOUR
Is some colour produced
in B/W broadcast
Check IC801, R801,R802,
D804, D805 and D806.
Is the white balance
properly adjusted?
Readjusted the white
balance.
The picture colour is
yellow.
The picture colour is
magenta.
The picture colour is
cyan.
Check Q872,Q887 and
their adjacent circuits.
Check Q871,Q883 and
their adjacent circuits.
Check Q870,Q885 and
their adjacent circuits.
38
21KF-80H
NO PICTURE, NO SOUND
Does the noise level increase at
max.
Contrast, Brightness and Sound
Noise increase but .
No signal is received.
No snow noise.
Check the tuner supply voltage
LB must be approx 5V.
BT must be approx. 32V,
and CH preset data check.
Does noise or signal appear
at pin40 of IC801?
Does noise or
signal appear at
pin38 of IC801?
pin38 of IC801?
Does noise or
signal appear at
pin23 and 24
of IC801?
Check IC801and
its related
circuit.
Check Q401,
Q402 and its
related
circuit.
Check pin1,2
of SF201, Tuner
and related
circuit.
Check pin37
of IC801and
of IC801and
related
circuit.
Check pin38
of IC801.
Check pin27
of IC801, Tuner
and related
circuit.
Check the Tuner
AGC at TP201.
NO SOUND
Does signal appear
at pin6 of IC302 / 303?
Does signal appear
at pin2 of IC302 / 303?
Check Speaker.
Check IC302 / 303
and peripheral
circuit.
Check IC3001and
its related
circuit.
39
21KF-80H
PARTS LISTING
REPLACEMENT PARTS
Replacement parts which have special safety characteristics are identi-
fied in this manual. Electrical components having such features are
identified by in the Replacement Part List.
The use of a substitute replacement part which does not have the same
safety characteristics as the factory recommended is not permitted.
Replacement parts not shown in this service manual may create shock
fire, or other hazards.
fied in this manual. Electrical components having such features are
identified by in the Replacement Part List.
The use of a substitute replacement part which does not have the same
safety characteristics as the factory recommended is not permitted.
Replacement parts not shown in this service manual may create shock
fire, or other hazards.
HOW TO ORDER REPLACEMENT PARTS
To have your order completed promptly and correctly please supply the
following information.
following information.
1. MODEL NUMBER
3. PART NO.
5. CODE
3. PART NO.
5. CODE
2. REF. NO.
4. DESCRIPTION
6. QUANTITY
4. DESCRIPTION
6. QUANTITY
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