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Appareils
de mesure a utiliser pour
effectuer
Ie controle
Si possible,
oscilloscope
a double voie,
mesures a faire contre 0 V
ou un instrument universel,
impedance
d'entree
> 20 kohm
24. Trouble shooting
The trouble
shooting
section
of these
instructions
provide
a brief
summary
of
possible
fault Causes. If the remedv for such a fault is not stated, we suqqest the
Return of the counter to your Heidenhain
supplier.
--
Mains fuse blown
Nixie tubes fail to illuminate
Supply voltaqe
too hiqh
Fauity'transfÖrmer
(primary side)
Short circuit in mains unit
Faulty transformer
No mains voltage
or main voltage too low
Mains fuse blown
Nixie voltage too low
Fuse for nixie voltage
blown
No nixie voltage
Dirn illumination
of all indicator
tubes
(all figures with low glow)
No supply voltages
for transducer,
U lamp
l
F5 V supplyvoltage
for counting decades
(on counter Platine) missing
Faulty Stabilisation
within
mains supply
unit. Adjust lamp voltage on potentio-
meter located at rear of counter
Counter operating
voltage missing or
Faulty Stabilisation
unit within mains
too low
power supply unit
Failure of preset feature
Faulty preset button or decade switch.
Cable
break
between
preset
decade
switch.
Cable
break
between
preset
decade
switches and counting decades
Cable break between
preset button and
counter Platine
Preset
input
faulty
(Schmitt
trigger)
or
countinq decade faulty
Failure of reset feature
as preset feature
Failure of bidirectional
counting fu'nction
missing or undefined.
Transducer
lamp faulty or lamp voltage
incorrect
or missing.
Transducer
supply voltage
out of permis-
sible tolerante
or missing.
Defective
transducer
connecting
cable
Counter
operating
voltage
+ 5V out of
tolerante
or missing
Reset feature constantly
functioning
Preset feature constantly
functioning
Directional
discriminator
faulty
(defective
IC)
Input amplifier
faulty (line receiver)
Finest decade faulty
Counting in one direction
only
Direction
discriminator
faulty
Countinq ceases
Counting takes place without
(IC circuitry)
Countinq decade or nixie driverdefective
Stray interference
pulses (check connec-
movement of transducer
Counting takes place for only a
tions to mass)
Insert bridges according
to item 17
quarter or half of the traversed
distance
Counting direction
incorrect
Interchange
connections
according
to
item 18
Failure of MEMOSET facility
Reference Signal from transducer
missing.
Reference Signal input on countercircuitry
(line receiver)
For measuring equipment
check
MEMOSET switch
in wrong
Position
or
faulty. Counting ceases
(traverse
over marker pulse)
Use a dual-trace
oscilloscope
against 0 V
or multimeter
input resistance
> 20 kohm
29
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