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Faultfinding trees, blockdiagram, supply diagram and testpoints.
A
Ensure communication
with the RC,
Check/Replace
No picture
(A8);IC7680
(Colour missing)
Put the set into the
No Menu
Service Default Mode
Black screen
either via the DST or by
Sound OK
pressing the buttons on
the RC in the following
order :062596<MENU>,
or via the service pins
(B);
Heater / Filaments
No
OK
An error code is
?
indicated by the blinking
LED via the SDM.
n-times blinking means
Yes
error n.
See also chapter 5.5 for
detailled information
(B);VG2
OK
?
Is there an error
indication
Yes
?
Yes
(A3);<F3>,<F4>
If the mainsupply or
OK
EHT is missing, then
?
the error message may
not be reliable. So in
this state check/replace
Yes
the
components of the
mainsupply and EHT in
the first place see
(A6);<V1..V4>
schematics ;
<V6,V7,V8>
(A1), (A2) and
OK
(A4);IC7250-D <S2>
Yes
B
(B);<V11..V16>
OK
Yes
1
3
1
0
Check/Replace
(B);CRT
L9.2E
1
3
1
0
Check / Replace
(A2);L5480,Conn.0220
Check / Replace
(B);Conn.0244,
No
(A5); Tuner 1000
L5342,CRT,
L5341
1
3
1
0
Check / Replace
Adjust VG2
(A5); IC7250
Check / Replace
(A2); TR5445,
No
(B);R3341,C2341
CRT
1
3
1
0
Check / Replace
Check/Replace
(A5); TS7268,
(A3);IC7401,
No
TS7000,FIL1001,
D6460.C2464,D6461
FIL1002
1
3
1
0
Check / Replace
(A5); IC7250
Check/Replace
No
(A6);IC7250-B/C
Check / Replace
(A10); TS7951,
1
3
1
0
Check/Replace
(B);Conn0245,IC7311,
No
Check / Replace
CRT Socket,
(A10);IC7953
TS7333,160V
or
IC7954
6.
GB 16
Picture OK
Menu OK
NO Sound
(l,r,l+r)
(A5); <L1>
No
OK ?
Yes
(A5); <L2>
No
OK ?
Yes
Mono versions
(A5);<I9>
No
Ok ?
Yes
Check / Replace
(A5);<I4>
(A5);TS7266
Conn0239
No
Ok ?
(D1);
TS7801, TS7802
Yes
Check / Replace
(A10);<A3>
(D1);+8V,+5VA,
No
+5VB,x1801,
Ok ?
IC7803
Yes
Check / Replace
(A10);
(D2);Audio Supply
<A4>..<A5>
No
10V / 14V
IC7953 or
Ok ?
IC7954
Yes
Check / Replace
(A10);Conn.0215,
Loudspeaker
NO Picture
NO Sound
Menu OK
1
2
1
0
Check / Replace
(A5);Antenna,
D6007,
(A6);X1205..X1208
Sound and Picture
from external source
OK ?
Yes
1
2
1
0
Check / Replace
Nicam/2CS
Tuner1000
MSP3415D
(D1);<A20>
No
Ok ?
Yes
(P1);<A21>
;<A22>
No
Ok ?
Yes
(D2);<A25>
No
<A26><27>
<28> Ok ?
Yes
Check / Replace
(D2);Conn,0246,
Conn,0247
Speakers
Deflection not OK
Pictures are not
symetrical and unstable
C
1
1
1
A
Check / Replace
No
IC7250
CL 96532028_010.eps
290399
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