KX-T7665UA - Panasonic PBX Service Manual (repair manual)

ORDER NO. KMS0704324CE

(for Ukraine)

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PAGE

PAGE

1 Safety Precautions -----------------------------------------------3

1.1.  For Service Technicians ---------------------------------3

2 Warning --------------------------------------------------------------3

2.1. About Lead Free Solder (PbF: Pb free) --------------3

3 Specifications ------------------------------------------------------4
4 Technical Descriptions------------------------------------------5

4.1. Block Diagram ----------------------------------------------5
4.2. Circuit Operations ------------------------------------------6

5 Location of Controls and Components------------------ 14
6 Installation Instructions--------------------------------------- 15

6.1. Connection------------------------------------------------- 15

7 Troubleshooting Guide---------------------------------------- 16

7.1. No Operation ---------------------------------------------- 16
7.2. LCD Does Not Operate--------------------------------- 17
7.3. Handset Does Not Work-------------------------------- 18
7.4. Speaker-Phone Trouble -------------------------------- 19
7.5. DXDP-DPT Does Not Work --------------------------- 20

8 Disassembly and Assembly Instructions--------------- 21

8.1. Disassembly Instructions------------------------------- 21

9 Miscellaneous --------------------------------------------------- 22

9.1. Terminal Guide of ICs, Transistors and Diodes -- 22
9.2. How To Replace a Flat Package IC----------------- 23

10 Schematic Diagram -------------------------------------------- 24

10.1. --------------------------------------------------------------- 24
10.2. Waveform-------------------------------------------------- 26

11 Printed Circuit Board------------------------------------------ 30

11.1. Component View----------------------------------------- 30
11.2. Bottom View----------------------------------------------- 31

12 Appendix Information of Schematic Diagram -------- 32
13 Exploded View and Replacement Parts List----------- 33

13.1. IC Data ----------------------------------------------------- 33
13.2. Cabinet and Electrical Parts Location -------------- 37
13.3. Accessories and Packing Materials----------------- 38
13.4. Replacement Parts List -------------------------------- 39

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1. Cover the plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on the worktable.
4. Do not touch IC or LSI pins with bare fingers.

In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that con-
tains lead.
We will use PbF when discussing the lead free solder used in our manufacturing process which is made from Tin, (Sn), Silver,
(Ag), and Copper, (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder. 

• PbF solder has a melting point that is 50

° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with tempera-

ture control and adjust it to 700

° ± 20° F, (370° ± 10°C). 

Exercise care while using higher temperature soldering irons.:
Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB.

• PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100

°F, (600°C).

• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the

opposite side (See figure, below).

There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper,
(Sn+Ag+Cu), you can also use Tin and Copper, (Sn+Cu), or Tin, Zinc, and Bismuth, (Sn+Zn+Bi). Please check the manufac
turer's specific instructions for the melting points of their products and any precautions for using their product with other 
materials. 
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.

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Design and specifications are subject to change without notice.

90 ohms

2 pair wire

Handset Jack, TEL Jack

Low Angle:
High Angle:

213 (D)mm 

× 177 (W)mm × 107 (H)mm

201 (D)mm 

× 177 (W)mm × 127 (H)mm

0.7 kg