Interquartz 98583 - Manual (Page 21)

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6. Maintenance and Problem Solving
Your telephone is a precision electronic instrument. Avoid rough handling
and extreme temperatures. Use a mild detergent and a damp cloth when
cleaning. Never use a stronger cleaner.
If your telephone does not appear to be working correctly, please check the
following :
No dial tone - is phone cord properly connected to the wall socket ?
Will not dial - tone / pulse switch may be set to wrong position
Will not ring - ringer switch is set to off
- REN number may exceed 4, for all telephones connected
to the line. Disconnect a phone until the number is below 4
If there are still problems, and you have more than one telephone :
Remove the "problem" telephone. Insert another telephone and check that it
works. If "yes" then the "problem" telephone is possibly faulty. If not, then
you may have a faulty line. Try using the other socket and see which
telephones work. If you do have a faulty line then you should contact your
Network Supplier.
You should however be aware that if you request them to repair a fault that is
found not to be their's, then they are entitled to charge you for a visit.
In the event that you still have problems then you should consult your supplier.