KX-TG8288UAT, KX-TG8287UAT, KX-TGA828UAT, KX-TGA828RUT - Panasonic Telephone Service Manual (repair manual). Page 107

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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=1000Ω, M=1000kΩ

All capacitors are in MICRO FARADS (

µF)P=µµF

*Type & Wattage of Resistor

(*1) When replacing IC501, IC502, IC602, IC603 or X501,
data needs to be written to them with PNZZTG8288UA.
Refer to Base Unit (P.74) of Things to Do after Replacing
IC or X’tal.
(*2) When replacing IC601, refer to How to Replace the
LLP (Leadless Leadframe Package) IC (P.60).
(*3) IC602 and IC603 need software downloading. Refer to
Base Unit (P.74) of Things to Do after Replacing IC or
X’tal.