KX-NT551RU-B - Panasonic Telephone Service Manual (repair manual). Page 85

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1. RTL (Retention Time Limited)

The “RTL” marking indicates that its Retention Time is
Limited.
When production is discontinued, this item will
continue to be available only for a specific period of
time.
This period of time depends on the type of item, and
the local laws governing parts and product retention.
At the end of this period, the item will no longer be
available.

2. Important safety notice

Components identified by the   mark indicates special 
characteristics important for safety. When replacing any 
of these components, only use specified manufacture's 
parts.

3. The S mark means the part is one of some identical parts. 

For that reason, it may be different from the installed part. 

4. ISO code (Example: ABS-94HB) of the remarks column 

shows quality of the material and a flame resisting grade 
about plastics.

5. RESISTORS & CAPACITORS

Unless otherwise specified;
All resistors are in ohms (

) k=1000, M=1000k

All capacitors are in MICRO FARADS (

F) p=F

*Type & Wattage of Resistor