Durr XR25 Bedieningshandleiding - Pagina 13

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9. 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• Films out of date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..