KX-TG8521UAB, KX-TGA850RUB (serv.man2) - Panasonic Telephone Service Manual (repair manual). Page 86

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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 (

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 PNZZTG8521UA. Refer to How to download the
data (P.55) of Things to Do after Replacing IC or X'tal.
(*2) When removing E1, use special tools (ex. Hot air
disordering tool).
(*3) Backside of this IC has a ground plate. Refer to How to
Replace the LLP (Leadless Leadframe Package) IC
(P.61)
(*4) Supplied IC is Flat Package Type.

Type

ERC:Solid
ERDS:Carbon
ERJ:Chip

ERX:Metal Film
ERG:Metal Oxide
ER0:Metal Film

PQ4R:

Chip

ERS:Fusible Resistor
ERF:Cement Resistor

Type

ECFD:Semi-Conductor
ECQS:Styrol
ECUV,

PQCUV,ECUE

:Chip

ECQMS:Mica

ECCD,ECKD,ECBT,F1K,ECUV:Ceramic
ECQE,ECQV,ECQG:Polyester
ECEA,ECST,EEE:Electlytic
ECQP:Polypropylene 

Wattage

*Type & Voltage Of Capacitor

10,16:1/8W

14,25:1/4W

12:1/2W

1:1W 2:2W 3:3W

Voltage

ECQ Type

ECQG
ECQV Type

05:50V
  1:100V
  2:200V

ECSZ Type

0J     :6.3V
1A     :10V
1C     :16V
1E,25:25V

1V     :35V
50,1H:50V
1J      :16V
2A      :100V

0F:3.15V
1A:10V
1V:35V
0J:6.3V

Others

1H:50V
2A:100V
2E:250V
2H:500V