KX-NS520RU, KX-NS520UC - Panasonic PBX Service Manual Supplement (repair manual). Page 2

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Suffix

Reason for suffix change

U to V

Software version up.(V8.241 -> V9.000)

V to W

Software version up.(V9.000 -> V9.015)

W to X

Countermeasure for Lightning surge.

Suffix

Reason for suffix change

T to U

Software version up.(V8.241 -> V9.000)

U to V

Software version up.(V9.000 -> V9.015)

V to W

Countermeasure for Lightning surge.

Suffix

Reason for suffix change

Q to R

Software version up.(V8.241 -> V9.000)

R to S

Software version up.(V9.000 -> V9.015)

S to T

Countermeasure for Lightning surge.

Suffix

Reason for suffix change

N to O

Software version up.(V8.241 -> V9.000)

O to P

Countermeasure for Lightning surge.

4 1

8 0

4 0

1

REF2

3

5

7

PNLB2261W*-YY

R420

R231

R248

R249

C212

R250

C214

R255

R256

R257

R258

R259

R260

R261

R262

R263

R264

R265

R266

R267

R475

R287

R484

R290

R291

TP_CLK_16.384MHz

C338

C349

C350

R391

R392

R393

R394

T301

TP_DG2

TP_DG3

TP_DG4

NS5XX

NS7XX

NS3XX

If the part number of the CPU PCB Board is after the following number, the suffix will be X (KX-NS520BX, 
KX-NS520BR, KX-NS520LA, KX-NS520NE, KX-NS520SU, KX-NS520UE), W (KX-NS520SA), 
T (KX-NS520AG), P (KX-NS520UC, KX-NS520RU)  or later.  When servicing, you need to check the suffix.

Refer to “PNLB2261W”

(Example)

Serial No.
Label

Suffix N - X

2HAQX123456