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SERVICE NOTE
Symptoms (1)
When the power switch is pushed, electric supply
wil not be on.
Symptoms (2)
Likely defective places
A. .Poor power switch.
B. Poor power cord.
C. Poor plug contact.
D. Blown fuse.
(In case the fuse blows again upon fitting a
new one)
Replace it.
Replace it.
Replace the plug or make the plug contact
better.
Replace it.
Short-circuit rearing in the power transformer
(T s) or short-circuit of pass condenser (Css)
Symptoms (1 )
When the power switch is pushed, electric supply will be on.
Syptmoms (2)
A. The tuner does not work at
all.
B. Only the FM tuner does
not work at all.
C. Only the FM-MPX system
does not work.
D. Only the AM tuner does
not work
A. In case of small FM broad-
casting sounds with nothing
wrong in voltage in resp.
places.
1. Broken wires of vacuum tube heaters.
2. In case there is something wrong in the
vacuum tube and voltage in resp. places
1. Broken wires of vacuum tube heaters In
the FM system.
2. In case there is something wrong in the
vacuum tube and voltage in resp. places
in the FM system.
3. In case there is nothing wrong In resp.
places in the FM system.
1. Broken wires of vacuum tube heaters In
the multiplex system.
2. In case there is something wrong in the
vacuum tube and voltage in rtlSp. places
in the multiplex system.
3. In case there is nothing wrong in the
vacuum tube and voltage in the multiplex
system.
1. Broken wires of vacuum tube heaters in
the AM tuner system.
2. In case there is something wrong in the
vacuum tube and voltage in resp. places
in the AM tuner system.
3. In case there is nothing wrong in the
vacuum tube and voltage in resp. places
in the AM tuner system.
1. Divergence in tracking regulation.
2. Divergence in 1FT regulation.
3. Poor diode.
4. Drop in Q of coils etc.
5. Poor condensers.
6. Misregulation of the semi-fixed resistance.
7. Poor contact of the rotary switch.
-13-
Likely defective places
V,~V14 and silicon diodes.
Check
the places where there
wrong in voltage.
is something
V,~V4' V7~V,O
Check the places where there is something
wrong in voltage.
Insuffcient capacity of C24, C4b poor 1FT
(Ti~Ts) Short-circuit of C2S' C40, Trouble in
the local oscilating circuit of Vsa (6AQ8)
If the FM tuner works normally, check Vll~
V,S.
Check the places where there is something
wrong in voltage.
If the FM tuner works normally, it is caused
by insuffcient capacity of C43, CS4' Css, CSS,
CS7' and poor L14, L1s, L16.
VS:V6, V7
Check the places where there is something
wrong in voltage.
Poor 1FT (T6, T7) and RF coil (Lii). Poor
diode (OA-91). Short-circuit of C17 and CIS
Refer to the regulation method of the FM
tuner.
Refer to the regulation method of the FM
tuner.
Germanium diode (OA-91)
Li, Ls, L6
Insuffcient capacity of CiO, Ci2, Cl4, C40, C41
VR-l
S2b
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