KX-TG7321RUC, KX-TG7321RUS, KX-TGA731RUC, KX-TGA731RUS (serv.man2) - Panasonic Telephone Service Manual (repair manual). Page 100

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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 con-
tinue 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 (

Ω) k=1000 Ω, M=1000 kΩ

All capacitors are in MICRO FARADS (

µF)p=µµF

*Type & Wattage of Resistor

(*1) When replacing IC7, IC401 or X1, make the adjustment
using PQZZTG7321RU. Refer to Base Unit (P.70) of
Things to Do after Replacing IC or X'tal.
(*2) When you removing E1, use special tools (ex. Hot air
disordering tool).
(*3) Backside of this IC has a ground plate.
(*4) Supplied IC is Flat Package Type.