KX-TDE0110XJ, KX-TDE0110X - Panasonic PBX Service Manual (repair manual). Page 52

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Note:

1. RTL (Retention Time Limited)

The marking (RTL) indicates that the Retention Time is
limited for this item.
After the discontinuation of this assembly in production,
the item will continue to be available for a specific period
of time. The retention period of availability depends on
the type of assembly and the laws governing parts and
product retention. At the end of this period, the assembly
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 (

Ω), k=1000Ω, M=1000kΩ

All capacitors are in MICRO FARADS (

µF), p=µµF

*Type & Wattage of Resistor