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D.C. METER
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OR A.C. METER
TUNE IN
| DETUNE
max.
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108 MHz
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A\f=75 kHz
Display
108.00 MHz
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SERVICING HINTS
3. FM IF offset
1. ESD
A
The ceramic resonators (F1+F4) have different
:
~ 4"
intermediate frequencies as a result of tolerances.
Dependent on the IF jumper has to be applied or a
All Cs and many other semi-conductors are sensitive
bridge has to be opened. B0+B3 (see table).
to electrostatic discharges (ESD).
The resonators have been provided with a colour code.
Careless treatment during repairs may drastically
reduce life.
4. Ceramic resonators F1 + F4
When repairing, make sure that you are connected,
When replacing one of the ceramic resonators, take
le
ae
via a wristlet, the same potentional as the chassis of
care that the colour codes of all three resonators are
Oe A a
a0
the set.
|
7
the same.
ve
Keep components and tools at this potential as weil.
See Service information A86-1000 for this.
2. Display DP401
The outputs of the display drivers are not protected
against external overvoltages! When testing the
display with external voltages, you should interrupt the
connection with C401.
|
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