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AC voltage values measured in the signal path o£ the transmitter call
be measured only if the cransmi[ter is modulated with a two-tone
signal. This can be done by pressing the TUNE button of the trans-
nitcer .
7.7.
DC voltages
DC voltages listed in the circuit diagrams are based on neasuremeric
with a 25 hohas/Volt: multimeter. If a stated voltage i§ dependent
or` the setting of a control this is also stated on the circuit did-
grans. typical logic levels (LOW/HIGH) are indicated in brackets.
7. 8.
Adius[ments
The following sections describe aligrment procedures for printed
circuit boards that contain adjustable components. Bear iri mind that
no adjustnents should be carried out unless there is a clear indi-
tion that i[ is really necessary. tforeover, adjustments should be
carried out only by a qualif ied technician with the necessary equip-
menc at his disposal.
When a unit or printed circuit board is replaced adjustments are in
some c:ases necessary. These cases are listed in the table I)elow.
Replacement: of unit
Adjustment required
Procedure given in
or board
of
E 5002
I.evel setting244-R15
Transmitter manual
AE34
§eccion 7.8.3.Section7.9.2.
Level settingLevelsetting244-R15
Transmi t t e r manual s ect i o n7. 8 . 3 . T ransDi c cermanual s ect i o n7. 8 . 3 . s ect i o n7. 9 . 2 .
20
209-R13
secticm
7.13.3.
A
209-R14
sectioti
7.13.4.
2 1 0-RS
section
7.14.2.
I 5000/I 5001/
Level secti.ng
Transmitter ma]iual
I 5002
section
7.8.3.
A Realigrmenc of " MHz Exciter
Measuring equipment :
Oscillo§cope having a sensitivity better than 50nv/div. Input impe-
dance 10 Mohm in parallel with 20 pF or less.
7.9.1. Realigrmenc of 244R6, Microphone Sen8icivity:
The microphone sensitivity potencioneter i§ nomally fully clockwise,
corresponding to full sensitivity. When the transmitter is installed
where there is a higb acoustic noise level it can be advalitageous to
7-2
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