KX-MB773RU, KX-MB773UA (serv.man2) - Panasonic Fax Service Manual Supplement (repair manual). Page 2

2

There are three kinds of Main Board, a new type, old type1 and old type2.
The service of new type and old type Main Boards should proceed according to each respective procedure.
When replacing the Main Board or parts on the Main Board, first confirm if it is a new or old type Main Board by referring to the
table below.

(The fifth digit of the serial number is the suffix.)

OFor each type Main Board, see the contents of this supplement about the item of the table below. 

Reason for Change
*The following items (1-8) indicate the reason for change. See the “Notes” column for each part in ORIGINAL AND NEW PARTS 
COMPARISON LISTS.
1. Improve performance

Notes:
(*1): When Main Board is an old type2.
(*2): When Main Board is a NEW type.

Remark: 
*a : To enhance the quality.

2. Change of material or dimension
3. To meet approved specification
4. Standardization
5. Addition
6. Deletion
7. Correction
8. Other

Old type1, PFWP1MB773RU

A

PFUP1657ZA

Old type2, PFWP1MB773RU

B or C

PFUP1657ZA-1

New type, PNWP1MB773RU

D or later

PFUP1657YA

Old type1, PFWP1MB773UA

A

PFUP1657ZA

Old type2, PFWP1MB773UA

B or C

PFUP1657ZA-1

New type, PNWP1MB773UA

D or later

PFUP1657YA

R573

CN514

1

2

R534

CN509

1

4

09

CN502

C525

1

D503

L502

C671

C673

R452

C491

PbF

PFUP1657ZA-1

Q524

E

E

KX-MB773RU/UA Service Manual

(Order No.KMF0709108CE)

Contents of Supplement

Main unit bareboard

Old type1: 

PFUP1657ZA

Old type2:

PFUP1657ZA-1

New type: 

PFUP1657YA

6. Technical Descriptions

6.6. CIS CONTROL SECTION

*1

*1

3.1.1. CIS CONTROL SECTION  
Refer to P.7

6.17. Main Board Section

*1

*1

3.1.2. Main Board Section Refer 
to P.8

12.3. TROUBLESHOOTING DETAILS