Durr XR25 Посібник з експлуатації - Сторінка 13
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Друкувати сторінку9. FAULT FINDING INFO.
Condition
1. Film too light
2. Films too
dark
3. Yellow/Green
veiling on the
film
4. Dark veiling
on films
5. Increased
background
veiling on the
film
6. Brownish
veiling on the
film
Possible causes
• Developer temperature too
low
• X-ray exposure time too short
• Developer solution exhausted
• Developer temperature too
high
• X-ray exposure time too long
• Film not properly fixed
• Light getting into darkroom,
e.g. through keyhole
• Darkroom light wrongly
positioned
• Film has been affected by
Processor control lights
• Lid of daylight attachment not
properly closed
• Films out of date
• Film falsch gelagert.
• Film not properly washed
Remedy
Set temperature to 28°C
If possible, longer exposure time
Drain chemicals and mix fresh solutions.
Set temperature to 28°C
Shorten x-ray exposure time
Test whether Fixer solution is OK: Swish
film to and fro for approx. 40 secs. If the
film is transparent, the fixer is fine.
Should veiling persist: Drain chemicals
and mix fresh ones.
Check darkroom for light leakage and
seal off source.
Only indirect light allowed
Check all control lights and if necessary
dim them
When inserting extraoral and panoral
films the cover of the filter pane must be
closed.As films are light sensitive, the
lid must be properly closed.
Check sell-by date
Store films in a cool place. Films should
not be kept near the x-ray machine.
(Scattered radiation)
Open water tap.
Safety switch in water bath has
switched off water inlet valve - Check
water drain..
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