KX-DT521RU - Panasonic PBX Service Manual Supplement (repair manual)

kx-dt521ru service manual supplement
Model
KX-DT521RU
Pages
28
Size
2.11 MB
Type
PDF
Document
Service Manual Supplement
Brand
Device
PBX / DIGITAL PROPRIETARY TELEPHONE
File
kx-dt521ru.pdf
Date

Read Panasonic KX-DT521RU Service Manual Supplement online

ORDER NO. KMS1604790SE
Digital Proprietary Telephone
Model No.
KX-DT521 Series
Main Board Unit Change
                        
Supplement-4
5
1
4
L 3 0 1
L 3 0 2
JK300
R301
R 3 0 2
R 3 0 3
R309
R310
R311
C 3 0 2
C 3 0 3
C 3 0 4
C 3 0 5
R 5 3 7
C 3 0 9
R 5 4 1
R5
R 5 5 2
R 5 5 4
R 5 5 6
R 5 6 2
C 5 5 0
C 5 5 1
C 5 5 2
D30
C 5 5 6
C 5 5 7
C558
D315
T300
C 5 8 9
IC
P N L B 2 2 9 0 Z C - G W
C
REF-2
PbF
When servicing, you must confirm which service manual should be referred by the following methods.
Refer to “PNLB2290ZC”
Model No.
KX-DT521/-B
E
KMS1403008CE
KX-DT521NE/NE-B
E
KMS1401979CE
KX-DT521NZ/NZ-B
E
KMS1404057CE
KX-DT521RU/RU-B
E
KMS1404049CE
KX-DT521SX/SX-B
E
KMS1403009CE
KX-DT521UK/UK-B
E
KMS1403010CE
KX-DT521X/X-B
F
D
D
D
D
D
D
E
KMS1403011CE
Suffix
Please file and use this supplement manual together with the service manual.
Service Manual
Order No.
Destination
USA, Canada
Europe
Russian, Ukraine, Kazakhstan
India
United Kingdam
Asia, Latin America, Middle Esat, Africa
Compatibility
Parts
Set Production
Original
New
Early (before change)
Late (after change)
Original parts may be used in early production sets only. 
New parts may be used in late production sets only. Stock both original 
and new parts.
2
TABLE OF CONTENTS
PAGE
PAGE
1 Technical Descriptions------------------------------------------3
1.1. Circuit Operations ------------------------------------------3
1.1.1. LCD Circuit ----------------------------------------------3
1.1.2. Reset Circuit --------------------------------------------3
1.1.3. Analog Circuit ------------------------------------------4
2 Troubleshooting Guide------------------------------------------6
2.1. No Operation ------------------------------------------------6
2.2. ASIC1(IC300) Does Not Operate -------------------- 12
2.3. LCD Does Not Operate --------------------------------- 13
2.4. DXDP Does Not Work ---------------------------------- 14
2.5. Audio Problem -------------------------------------------- 15
2.6. Handset Does Not Work-------------------------------- 15
2.6.1. Receive ------------------------------------------------ 15
2.6.2. Send ---------------------------------------------------- 16
2.7. Headset Does Not Work-------------------------------- 17
2.7.1. Receive ------------------------------------------------ 17
2.7.2. Send ---------------------------------------------------- 18
2.8. Speaker-Phone/Ringer Does Not Work ------------ 18
2.8.1. Receive / Ringer ------------------------------------- 18
2.8.2. Send ---------------------------------------------------- 19
2.9. LED Does Not Light ------------------------------------- 20
3 Schematic Diagram--------------------------------------------- 21
3.1. Main No.1 -------------------------------------------------- 21
3.2. Main No.2 -------------------------------------------------- 23
4 Printed Circuit Board ------------------------------------------ 25
4.1. Main Board------------------------------------------------- 25
4.1.1. Component View ------------------------------------ 25
4.1.2. Bottom View ------------------------------------------ 26
5 Exploded View and Replacement Parts List ----------- 27
5.1. Replacement Parts List --------------------------------- 27
5.1.1. Main Board Parts ------------------------------------ 27
3
1 Technical Descriptions
1.1.
Circuit Operations
Changed from Original Service Manual as section 4.2.1.
1.1.1.
LCD Circuit
LCD data are output from pin 66 of IC410 to LCD module.
LCD contrast is set by electronic volume in LCD module.
VCC33 (+3.3V) of the power supply voltage is doubled in the LCD module and used as LCD driving voltage (approx. 6.5V(KX-
DT521))
The driving voltage is observed between pin 12 (V0) and pin 13(XV0) of CN460.
The lighting of the backlight is controlled by Q460.
The power of the backlight is output from DOUT4V5 of IC410.
Changed from Original Service Manual as section 4.2.2.
1.1.2.
Reset Circuit
IC410 (DCX81) is reset internally by itself when power is supplied.
Reset Signal is output from IC410 and input into IC300 (pin 1) ,CN460 (pin 5) and IC205 (pin 41).
D460
C460
L460
C462
C466
C464
C463
CN460
1
ESD-VSS
2
SCL
3
SDA
4
A0
5
/RES
6
/CS
7
VDD1
8
VD1
9
VSS
10
VDDA
11
VM
12
VO
13
XVO
14
VG
15
ESD-VSS
C467
DG
DG
VCC33
C461
C465
DG
DG
96
66
95
94
97
R435
R437
R436
R434
SPI_CLK
SPI_D0
LCD_A0
LCD_RS
LCD_CS0
7
LCD_BL
Q460
LED-
LED+
DCX81
IC410
25
C574
C575
LCD_PWR
DG
LCD Backlight
R463
C583
C582
DG
C584
DOUT4V5
EXGPIO10
GPIO18
GPIO17
GPIO16
GPIO15
GPIO19
3.3V
6
IC410
DCX81
R423
DG
C362
DG
1
IC300
RSTN
10
R424
DG
CN400
10
CN205
5
ASIC_RST
41
C243
DG
94
CN460
5
/RES
LCD_RS
IC205
VCC33
5
EXGPIO9
GPIO15
EXGPIO8
RSTN
VCC1
VCC2
VCC3
VCC4
94
64
79
73
ASIC1
LCD
RESET
ASIC2
Main PCB
Ope PCB
RESETIC
DG
DG
DG
C429
R474
R473
C469
IC470
C468
4
1
3
2
4
Changed from Original Service Manual as section 4.2.5.
1.1.3.
Analog Circuit
1. Speaker phone call
Transmitting signal is input from microphone 
 input to IC410-pin 33 and 34  amplified by a built-in analog amplifier of
IC410 
 A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.
Receiving signal is sent by data from PBX 
 Gain adjustment and D/A conversion by a built-in DSP of IC410  amplified by
a built-in analog amplifier of IC410 
 output from IC410-pin 38 and 40  output to Speaker.
2. Handset call 
Transmitting signal is input from handset microphone 
 input to IC410-pin 35 and 36  amplified by a built-in analog ampli-
fier of IC410 
 A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.
Receiving signal is sent by data from PBX 
 Gain adjustment and D/A conversion by a built-in DSP of IC410  amplified by
a built-in analog amplifier of IC410 
 output from IC410-pin 41  output to handset speaker.
MIP
SPP
SPN
SPAMPEN
IC410
DCX81
DG
AGND
AGND
AGND
SPP
AGND
SP2
MIP
AGND
MIC1
DG
AGND
SP1
MICBIAS
SPN
MIC2
MIN
AGND
AGND
C500
C501
C504
C503
C507
C502
C506
C530
C531
C532
C534
C535
C537
C538
R534
R532
R533
C536
DG
DG
DG
DG
G
D
G
D
D500
D501
D530
D531
R565
C569
C540
C541
R530
R531
38
SPOUTP
40
SPOUTN
34
MIP
33
MIN
R535
HSMICINP
IC410
DCX81
AGND
AGND
AGND
AGND
AGND
AGND
MICBIAS
AGND
AGND
AGND
AGND
C515
C516
C517
R517
R518
R519
R520
C521
C522
C523
C524
C526
C527
C528
DG
DG
DG
DG
D515
D516
D517
HSMIP
HSMIN
HSSPOUT
JK501
1
2
3
4
5
L463
L464
L465
R564
C570
C518
C513
C514
R515
R516
C525
C519
C520
R574
DG
Handset Jack
36
HSMIP
35
HSMIN
41
HSSPOUTP
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Here you can read online and download Panasonic KX-DT521RU Service Manual Supplement in PDF. KX-DT521RU service manual supplement will guide through the process and help you recover, restore, fix, disassemble and repair Panasonic KX-DT521RU PBX. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.