Panasonic KX-FP105BX User manual

1
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
Simplified
KX-FP105BX
KX-FP105CX
©1999 Kyushu Matsushita Electric Co., Ltd.
All rights reserved. Unauthorized copying and distribution is a violation of law.
(for Asia, Middle Near and Other Areas)
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians.
Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury
or death.
Please use this manual together with the Service Manual for model No. KX-FP101, order No.KM79902261C1.
This Service Manual indicates the main differences between; Original KX-FP101 and KX-FP105BX/KX-FP105CX.
Compact Plain Paper FAX
ORDER NO. KM79909310A3

2
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
1.10. OPTIONAL ACCESSORIES
1.9. SPECIFICATIONS (Change from original page 7.)
Model No. Description Specifications
KX-FA137A Film cartridge
1 cartridge and 1 film[216 mmx 100 m(81/2" x 328') roll]
The filmhas already been installed in the cartridge.
Replacement film(KX-FA136A) can be installed in the cartridge
after initail usage.
Applicable Lines: Public Switched Telephone Network
Document Size: Max. 216 mm (8 1/2") in width
Max. 600 mm (23 5/8") in length
Effective Scanning Width: 208 mm (8 3/16")
Recording Paper Size: A4: 210 mm x 297 mm (8 1/4"x11 11/16")
Letter: 216 mm x 279 mm (8 1/2"x11")
Legal: 216 mm x 356 mm (8 1/2"x14")
Effective Printing Width: 208 mm (8 3/16")
Transmission Time*: Approx. 12 sec./page (Original mode)**
Approx. 30 sec./page (G3 Normal mode)
Scanning Density: Horizontal: 8 pels/mm (203 pels/inch)
Vertical: 3.85 lines/mm (98 lines/inch)-STANDARD mode
7.7 lines/mm (196 lines/inch)-FINE/HALF TONE mode
15.4 lines/mm (392 lines/inch)-SUPER FINE Mode
Halftone Level: 64-level
Scanner Type: Contact Image Sensor (CIS)
Printer Type: Thermal Transfer Printing
Data Compression System: Modified Huffman (MH), Modified READ (MR), Modified Modified READ (MMR)
Modem Speed: 9,600/7,200/4,800/2,400 bps; Automatic Fallback
Operating Environment: 5°C-35°C (41°F-95°F), 20%-80 % RH (Relative Humidity)
Dimensions (HxWxD): 143 mm x 325 mm x305 mm (5 5/8"x12 13/16"x12")
Mass (Weight): Approx. 4.0 kg (8.8 lb.)
Power Consumption: Standby: Approx. 5.5 W
Transmission: Approx. 12 W
Reception: Approx. 39 W (When receiving a 20% black document)
Copy: Approx. 40 W (When copying a 20% black document)
Maximum: Approx. 130 W (When copying a 100% black document)
Power Supply: 220 V - 240 V AC, 50/60 Hz
Memory Capacity: FAX momory: Approx. 28 pages memory reception
Approx. 25 pages memory transmission
(Based on CCITT No. 1 Test Chart in standard resolution, without
using the Error Correction Mode.)
* Transmission speed depends upon the contents of the pages, resolution, telephone line conditions and capability of the
receiving unit.
** The 12 second speed is based upon the CCITT No. 1 Test Chart and original mode. (Refer to “1.11. CCITT No. 1 Test
Chart”.) If the capability of the other party’s machine is inferior to your unit, the transmission time may be longer.
Note:
•œ
Any details given in these instructions are subject to change without notice.
•œ
The pictures and illustrations in these instructions may vary slightly from the actual product.
Design and specifications are subject to change without notice.

3
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
1.12.2. CONTROL PANEL (Change from original page 10)
AUTO ANSWER
BROADCAST BROADCAST
BROADCAST
FAX ON
1
4
HYPHEN SECRET
NAME/TEL NO.
LOWER
2
5
3
6
INSERT
SEARCH
HELP
DIRECTORY
PROGRAM
MENU
FWD
DOWNUP
BACK
REDIAL/PAUSE
MEMORY %
FLASH
MONITOR
HANDSET MUTE
RESOLUTION
COLLATE
ZOOM
STOP
OPER
PQRS TUV WXYZ
GHI JKL MNO
ABC
VOLUME
DEF
TONE
START/ SET / COPY
123
456
789
0
QUICK SCAN
•Used to print a quick reference.
•Used for voice muting.
Dial keypad
Display panel
•Used to adjust volumes.
•Used to select feature settings
during programming.
•Used to confirm a stored telephone number.
•Used to select a resolution.
•Used to send or copy the document
after storing it in memory.
•Used for transmission to multiple stations.
•Used for the One-Touch Dial.
•Used as command keys.
•Used to initiate or exit programming.
•Used to confirm a stored telephone number.
•Used to select stations 4–6 for the One-Touch Dial.
•Used to keep the telephone number secret.
•Used to insert one character or one space.
•Used to insert a hyphen.
•Used to turn on/off the
auto answer mode.
•Used to store or edit names and
telephone numbers.
•In the copy mode, used to choose
"Collated" or "Uncollated".
•Used for speaker operation.
•Used to redial the last number dialed.
•Used to insert a pause during dialing.
•Used to stop an operation or cancel programming.
•Used to search for a stored name.
•Used to select characters during
programming.
•Used to select basic features
during programming.
•In the copy mode, used to select an
enlargement/reduction rate.
•Used to change from pulse
to tone during dialing.
•Used to initiate fax transmission, reception or copying.
•Used to store a setting during programming.

4
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
1.13. CONNECTIONS (Change from original page 11)
(2) Telephone line cord
(3) Power cord
(1) Handset cord
To the single telephone line
To the power outlet
(220 V - 240 V, 50/60 Hz)
(1) Connect the handset cord.
(2) Connect the telephone line cord.
(3) Connect the power cord.
Note:
* When you operate this product, the power outlet should be near the product and easily accessible.
* If you want to connect an answering machine to the unit.
Connect to “LINE”.

5
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
Program mode Table (Change from original page 61)
Code Function Set Value Default Remote Setting
001 Set date and time mm/dd/yy hh:mm Jan/01/98 NG
002 Your logo --------- None NG
003 Your telephone number --------- None NG
004 Transmission report mode 1:Error / 2:ON/ 3:OFF Error OK
006 FAX ring count 1~4 1 OK
012 Remote TAMactivation 1:ON / 2:OFF ID=111 OK
013 Dialing mode 1:Pulse / 2:Tone Tone OK
016 Paper size 1: A4 / 2: LETTER/LEGAL A4 OK
018 Filmremain --------- --------- NG
022 Auto journal print 1:ON / 2:OFF ON OK
023 Overseas mode ON / OFF OFF NG
025 Delayed transmission ON/ OFF OFF NG
030 Silent FAX recognition ring 3 to 6 rings 3 OK
031 Distinctive ring 1:OFF / 2:A / 3:B / 4:C/ 5:D OFF OK
036 Rx reduction 1:92% / 2:86% / 3:72% / 4:OFF 92% OK
039 LCD contrast 1:Normal / 2:Darker Normal OK
040 Silent detection 1:ON / 2:OFF ON OK
041 Remote FAX activation code ON / OFF ON ID=*9 NG
042 Message alert 1:ON / 2:OFF OFF OK
043 REC. time alert 1:ON / 2:OFF OFF OK
044 Receive alert 1:ON / 2:OFF ON OK
046 Friendly receive 1:ON / 2:OFF ON OK
049 Auto disconnect ON / OFF ON NG
058 Original setting 1:Normal / 2:Light / 3:Darker Normal OK
068 ECM selection 1:ON / 2:OFF ON OK
070 FAX pager ON / OFF OFF NG
076 FAX tone 1:ON / 2:OFF ON OK
077 Auto answer mode 1: FAX Only 2:TEL/FAX FAX Only OK
078 TEL/FAX ring 1 to 4 rings 2 OK
079 Filmdetection 1:ON / 2:OFF ON OK
080 Set default YES / NO NO NG
501 Pause time set 001~600 x 100msec 050 OK
502 Flash time 01~99 x 10msec 070 OK
503 Dial speed 1:10pps / 2:20 pps 10pps OK
511 Vox time 1:6sec / 2:4sec 6sec OK
520 CED frequency select 1:2100Hz / 2:1100Hz 2100 OK
521 International mode select 1:ON / 2:OFF ON OK
522 Auto standby select 1:ON / 2:OFF ON OK
523 Receive equalizer select 1:0km/ 2:1.8km/ 3:3.6km/ 4:7.2km 0km OK
550 Memory clear --------- --------- NG
551 ROMcheck --------- --------- NG
552 DTMF signal tone test ON / OFF OFF NG
553 Monitor on FAX communication 1:OFF / 2:Phase B / 3:ALL OFF OK
554 Modemtest --------- --------- NG
555 Scanner test --------- --------- NG
556 Motor test --------- --------- NG
557 LEDtest --------- --------- NG
558 LCDtest --------- --------- NG
559 Document jamdetection 1:ON / 2:OFF ON OK
561 Key test --------- --------- NG
563 CCDposition adjustment 00~30 --------- OK
570 Break % select 1:61% / 2:67% 61% OK
571 ITS auto redial time set 00~99 14 OK
572 ITS auto redial line disconnection time set 30 OK
573 Remote turn-on ring number 01~99 15 OK
590 FAX auto redial time set 00~99 05 OK
591 FAX auto redial line disconnection time set 001~999sec 045 OK
592 CNG transmit select 1:OFF / 2:ALL / 3:AUTO ALL OK
593 Time between CEDand 300 bps 1:75ms / 2:500ms / 3:1sec 75ms OK
594 Overseas DIS detection 1:1st / 2:2nd 1st OK
595 Receive error limit value 001~999 100 OK
596 Transmit level set -15~00dBm -10 OK
598 Receiving Sensitivity 20~48 43 OK
599 ECM frame size 1: 256 byte / 2: 64 byte 256 byte OK
602 Warning list printing 1:ON / 2:OFF ON OK
700 EXT. TAMOGMRec. time 01~99sec 10sec OK
701 No voice detect time 01~99 50X100msec OK

6
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
(Change from original page 62)
Code Function Set Value Default Remote Setting
717 Transmit speed select 1:9600/ 2:7200/ 3:4800/ 4:2400 9600bps OK
718 Receive speed select 1:9600/ 2:7200/ 3:4800/ 4:2400 9600bps OK
719 Ringer off in TEL/FAX mode 1:ON / 2:OFF ON OK
721 Pause tone detect 1:ON / 2:OFF ON OK
722 Redial tone detect 1:ON / 2:OFF ON OK
745 Power on filmfeed 1:ON / 2:OFF ON OK
763 CNG detect time for friendly reception 1:10s / 2:20s / 3:30s 30s OK
771 T1 timer 1:35s / 2:60s 35s OK
774 T4 Timer 00~99 (X100ms) 00 OK
815 Sensor & VOX test --------- --------- NG
852 Print test pattern --------- --------- NG
853 Top margin 1~9 --------- OK
854 Left margin 1~8 --------- OK
880 History list 1:Start --------- NG
890 TEL/FAX ring back tone 1:ON / 2:OFF ON OK
991 Setup list 1:Start --------- OK
994 Journallist 1:Start --------- OK
995 Journal2 list 1:Start --------- OK
996 Journal3 list 1:Start --------- OK
998 History list 1:Start --------- OK
999 Service list 1:Start --------- OK

7
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
3-9. Power Supply Board Section (Change from original pages 76•`78)
(1) Key components for troubleshooting
Check the following parts first: F101, D101-D104, C106, Q101, PC101 and IC101.
This comes from our experience with experimental tests.For example: power supply and lightning surge voltage test, withstanding
voltage test, intentional short circuit test, etc.
Caution:
If you find a melted fuse in the unit, do not turn on the power until you locate and repair the faulty parts (except for the fuse);
otherwise the fuse will melt again and you cannot pinpoint the faulty point.
In most cases, the symptom is that nothing is output.It is more likely that the fault is in the primary side rather than the secondary
side.Check the primary side first.
Input
Circuit
AC
Input
Surge
Absorber
Circuit
G
H
5V
24V
Kick-on
Voltage
Circuit
E
IC101
F
GND
Control
Circuit
R102
R103
Converter
Circuit C
D5V
Output
Circuit
24V
Output
Circuit
+
-
Rectifier
Circuit
A
B
C106
Error Detecting
Circuit
POWER SUPPLY BLOCK DIAGRAM
DUMMY LOAD to check voltage
1
2
3
4
5
6
7
8
V
V
V
GND
5V
24V
CN301
24.5V
} 0.5V
5.0V
} 0.25V
4.7k ¶
2W
33
¶
2W
: Volt Meter
When you check voltage in
a power supply unit alone,
use this dummy load.
If the dummy load is not
available, connect the main
P.C.B. to the analog P.C.B.
Surge
Absorber
Circuit

8
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
(2)Troubleshooting flow chart
Is F101 open?
YES
Replace F101.
Is D101-D104 short?
YES
Replace D101-D104.
NO
NO
24V output OK?
24V output OK?
5V output OK?
Replace the broken part and IC101.
Replace D202.
NO
NO
YES
Are R107, R109
and D106 OK?
YES
YES
NO
NO
Are D-G, D-S, and
S-G (Q101) short?
Replace Q101 and R105.
Power ON
Power OFF
Power OFF
Power ON
Power OFF
YES
NO
(Control circuit check)
A
A
* When testing for a short
circuit, turn off first and then
turn on when you start to
check output voltage (24V or
5V) as illustrated in the flow
chart.
* An analog tester is
recommended to use for
checking a short circuit.

9
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
24V output OK?
Replace the broken part.
Are D201, IC201, PC101
and R222 OK?
YES
NO
YES
NO
Replace the whole board.
A
24V output OK?
Are R108, D108, R125
and D107 OK?
NO
YES
Replace the broken part and IC101.
YES
NO
(Control circuit check)
A
Power ON
Power ON
Power OFF
Power OFF
Broken parts repair details
(D101, D102, D103, D104)
Check for a short-circuit in terminal 4. If D101, D102, D103 and D104 are short-circuited, F101 will melt (open).
In this case, replace all of the parts (D101, D102, D103, D104, F101).
(Q101)
The worst case of Q101 is a short-circuit between the Drain and Gate because damage expands to the peripheral
circuit of Q101.
This is due to a very high voltage through the Gate circuit which is composed of R107, R109, D106 and IC101.
You should change all of the parts listed as follows.
F101, Q101, R107, R109, D106, IC101
(D201)
If D201 is broken, the oscillation circuit in the power supply cannot operate. Check it with an electric tester.

10
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
Set Value
Code Set Value
Code
4-3. USER MODE (The list below is an example of the SYSTEM SETUP LIST the unit prints out.)
(Change from original page 86)
Note:
The above values are the default values.

11
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
2.4. SERVICE FUNCTION TABLE (Change from original page 87)
Code Function Set Value Effective Range Default Remarks
501 Pause time set X 100 msec 001~600 50
502 Flash time set X10 msec 01~99 70
503 Dial speed select 1:10 pps 2:20 pps 1, 2 1
511 Vox sense 1:High 2:Low 1, 2 1
When the TAM(or EXTTAM) does not stop
recording the ICMbecause noise is detected
on the telephone line, change this setting to
"LOW".
520 CEDfrequency select 1:2100 Hz 2:1100 Hz 1, 2 1 See Symptom/Countermeasure Table for long distance and international calls in
2.3.3.1. Defective Facsimile Section.
521 International mode select 1:ON 2:OFF 1, 2 1 See Symptom/Countermeasure Table for long distance and international calls in
2.3.3.1. Defective Facsimile Section.
522 Default mode select 1:ON 2:OFF 1, 2 1 The resolution reverts to the default when
transmission is complete.
523 Receive equalizer select 1:ON 2:OFF 1, 2 2 When the telephone station is far fromthe unit or reception cannot be performed
correctly, adjust accordingly.
550 "START" input
552 DTMFsingle tone test 1:ON 2:OFF 1, 2 2 See 2.5. TEST FUNCTIONS.
553 Monitor on FAX communication select 1: OFF 2:PHA SE B
3:ALL 1~3 1
554 Modem test See 2.5. TEST FUNCTIONS.
555 Scan check See 2.5. TEST FUNCTIONS.
556 Motor test 0 See 2.5. TEST FUNCTIONS.
557 LEDtest See 2.5. TEST FUNCTIONS.
558 LCD test See 2.5. TEST FUNCTIONS.
559 Document jamdetection select 1:ON 2:OFF 1, 2 1 See 2.2.1. Paper Jam.
561 KEY test See 2.5. TEST FUNCTIONS.
570 BREAK % select 1:61% 2:67% 1, 2 1 Sets the % break of pulse dialing according PBX.
571 ITS auto redial time set X number of times 00~99 14 Selects the number of times that ITS is
redialed (not including the first dial).
572 ITS auto redial line disconnection time set X second 001~999 30 Sets the interval of ITS redialing.
573 Remote turn-on ring number set X number of rings 01~99 15 Sets the number of rings before the unit starts to receive a document in the TEL
mode.
590 FAX auto redial time set X number of times 00~99 5 Selects the number of redial times during FAX communication (not including the first
dial).
591 FAX auto redial time disconnection time set X second 001~999 45 Sets the FAX redial interval during FAX
communication.
592 CNG transmit select 1: OFF 2:ALL
3:AUTO 1~3 2
Lets you select the CNG output during FAX
transmission.
ALL: CNG is output at phase A.
AUTO: CNG is output only w hen automatic
dialing is performed.
OFF: CNG is not output at phase A.
593 Time betw een CEDand 300bps 1: 75 msec 2:500 msec
3:1 sec 1~3 1 See Symptom/Countermeasure Table
for long distance and international calls in
2.3.3.1. Defective Facsimile Section.
594 Overseas DIS detection select 1:detects at the 1st time
2:detects at the 2st time 1, 2 1 See Symptom/Countermeasure Table
for long distance and international calls in
2.3.3.1. Defective Facsimile Section.
595 Receive error limit value set X Number of times 001~999 100 Sets the number of acceptable error lines when the FAX reconstructs the received
data.
Memory clear: To reset the value to the default one, except the top margin (853) and left margin (854).

12
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
(Change from original page 88)
Code Function Set Value Effective Range Default Remarks
596 Transmit level set X dBm - 15~00 10 Selects the FAX transmission level.
598 Receiving sensitivity 43= -43 dBm 20~48 43 Used when there is an error problem.
602 Warning LIST Printing 1:ON 2:OFF 1, 2 1 Used to print a caution list w hen setting
the TEL/FAX mode and ring detection.
700 EXT. TAMOGMRec.time X second 01~99 10 Set the start time of silent detection.
701 No voice detect time X100 msec 01~99 50 Sets the silent call confirmation detection
time.
717 Transmitspeedselection
1:9600BPS
2:7200BPS
3:4800BPS
4:2400BPS
1~4 1 Adjusts the speed to start training during
FAX transmission.
718 Receivespeedselection
1:9600BPS
2:7200BPS
3:4800BPS
4:2400BPS
1~4 1
Adjusts the speed to start training during
FAX reception.
719 Ringer off in TEL/FAX mode 1:ON 2:OFF 1, 2 1 Sets the ringer sw itch off when a call is
received in the TEL/FAX mode.
721 Pause tone detect 1:ON 2:OFF 1, 2 1 Selects the tone detection for pause in
dialing.
722 Redial tone detect 1:ON 2:OFF 1, 2 1 Selects the tone detection mode after
redialing.
745 Power ONfilmfeed 1:ON 2:OFF 1, 2 1 When the power is turned on, the filmis
wound to take up any slack.
763 CNG detect time for friendly reception 1:10 sec 2:20 sec
3:30 sec 1~3 3 Selects the CNG detection tome of friendly
reception.
771 T1 timer 1:35 sec
2:60 sec 1, 2 1 Sets a higher value when the response
fromthe other party needs more time
during FAX transmission.
774 T4 Timer 00~99(X100 msec) 00~99 00 Use this function when delay occurs on the line and communication does
notwork well.
815 Sensor & Vox check See 2.5. TEST FUNCTIONS.
852 Print test pattern See 2.5. TEST FUNCTIONS.
853 Top margin 1~9 --------
854 Left margin 1~8 --------
880 History list See 2.4.6. HISTORY.
890 TEL/FAX ring back tone 1:ON 2:OFF 1, 2 1 Selects w hether the TEL/FAX 1st ring back tone is ONor OFFin the TEL/FAX
mode.

13
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
2.4.5. SERVICE MODE SETTINGS (Example of a printed out list) (Change from original page 89)
Code Set Value
Note:
The above values are the default values.
Code Set Value
2.5.2. BUTTON CODE TABLE (Change from original page 95)
Code Button Name Code Button Name Code Button Name
02 RESOLUTION 31 1 3C #
04 START/COPY/SET 32 2 3D REDIAL/PAUSE
05 LOWER 33 3 3E FLASH
08 SP-PHONE 34 4 64 STATION 1
0A MUTE 35 5 65 STATION 2
0C RECEIVE MODE 36 6 66 STATION3
20 MENU 37 7 1E JOG (RIGHT)
22 HELP 38 8 1F JOG (LEFT)
24 DIRECTORY 39 9
25 £@ VOLUME 3A 0 00 NO INPUT
26 ¥@ VOLUME 3B 01 STOP

14
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
10. POWER SUPPLY BOARD SECTION (Change from original pages 171 ~ 173.)
This power supply board uses the switching regulator method.
[Input Circuit]
The input current goes into the input rectifier circuit through the filter circuit.The filter circuit decreases the noise voltage and
the noise electric field strength.
[Rectifier Circuit]
The input current is rectified by D101,D102,D103 and D104 and charges C106 to make DC voltage.Then it supplies power
to the converter circuit.
[Kick-on voltage circuit]
Bias is applied to the Q101 gate via this circuit when the AC power is turned on and Q101 begins operating.
Input
Circuit
AC
Input
Surge
absorber
circuit
G
H
5V
24V
Kick-on
Voltage
Circuit
E
IC101
F
GND
Control
Circuit
R102
R103
Converter
Circuit C
D5V
Output
Circuit
24V
Output
Circuit
+
-
Rectifier
Circuit
A
B
C106
Error Detecting
Circuit
Surge
absorber
circuit
E O.C.L
E Over voltage
Q101
A-B Voltage Wave Form
C-D Voltage Wave Form
E-F
G-H Voltage Wave Form
0
0
0
Block Diagram

15
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
L
Error amp rectifier
Control IC
n
1 : n 2
Coil width value
of the ratio SecondaryPrimary
Load
24V
E
1
Gate signal
T
ON T OFF
T=1/f= fixing
T
ON + T OFF =T
Q
1
I IN
D 1
E 2
V 0
V R
light load heavy load
00 1.0
= Duty ratio
=
T on
T
0.5
1
2
3
4
V
0 /E 1
Output/Input voltage value of ratio
The following is an overview of how the power supply unit is controlled.
The control method of this power supply unit is pulse width modulation.
When Q
1 is ON, the energy is charged in the transfer primary coil according to E 1 .
When Q
1 is OFF, the energy is output from the secondary transfer as follows.
L ? D1 ? Load ? L
Then the power is supplied to the Load. When Q
1 is ON, power is not output from the secondary side.
The output voltage is fed back in the control IC according to the error amp rectifier.
Then depending on how T
ON is controlled, stabilization occurs.
Also, when the current load becomes too large, in order to decrease the voltage output, the increase
in is controlled and the output voltage is stabilized.
Therefore, basically the timing: Ton/Toff of Q1 controls the output voltage.
increases

16
(Model KX-FP105BX/KX-FP105CX)
KX-FP105BX/KX-FP105CX
[Surge Absorber Circuit]
This circuit is for absorbing surge voltage generated by the transformer.
[Control Circuit and Detecting Circuit]
The control circuit amplifies the output with increased voltage detected in the error detecting circuit.Then it drives the main
transistor.
In this power supply, the duty ratio is defined by changing the ON period of the main transistor.
This is shown as follows.
When the output voltage of the 24V circuit increases, the current of the photo coupler PC101 increases, the pulse width of
the output control IC becomes narrower and the ON period of Q101 becomes shorter.
[Over Current Limiter (O.C.L)]
The highest drain current (Q101) is limited by a limiter circuit (IC101) of 24V.The 24V output is limited by this circuit.
[OverVoltage Circuit]
If the 24V output increases because the error detecting circuit or control circuit is broken, IC101 will recognize this signal
and output becomes 0V.
Dummy load method (to quickly check the power supply output)
Refer to 2.3.3.6. Power Supply Board Section.

17
KX-FP105BX/KX-FP105CX KX-FP105BX/KX-FP105CX
12345678 9 10 11 12
G
F
E
D
C
B
A
H
12. SCHEMATIC DIAGRAM (ANALOG CIRCUIT)...Change from original page 183.
12V
HANDSET
FAX TX
12V
HANDSET, MONITOR
FAX RX
5V
0V
EX-TEL OFF-HOOK

18
KX-FP105BX/KX-FP105CX KX-FP105BX/KX-FP105CX
12345678 9 10 11 12
G
F
E
D
C
B
A
H
(COMPONENT VIEW)
13.PRINTED CIRCUIT BOARD (SWITCHING POWER SUPPLY)...Change from original page 185.
(BOTTOM VIEW)
CAUTION
FOR CONTINUED PROTECTION AGAINST RISK OF
FIRE. REPLACE ONLY WITH
SAME TYPE
AND
RATINGS
OF FUSE
( F101 )
T3.15AH 250V
L101
R101
C102 R109 R105
R108
T101
C206
VR201
PC101
D106
TH101
D107
D109
IC101
ZNR101
F101
C101
D104
D103 C103
C104
C106
R106
R104
R110
L103
Q101 C109
C108 C107
D108
D105
D202
R205
J6
J5
J4
IC202 D201
IC201
C202
C205
C204 J10
J7
C201
CN301 18
C203
C105
D102
J1
J3
J2
D101
CN31
NL
SRF913EK PRIMARY
SECONDARY
T3.15AH 250V
F101
R125
R107
R122 S
D G
R127
R133
J8 T101
C223
R223
PC101
R121
R128
R129
R130
R131R132
R224
R225
24 G G G 5 G
C221
C224
CN301
R126
C121
C124
C122
R123
C123
1 85
R103
R102
CN31
68-4494A
7694V—0
N
L
SRF913EK
MITSUMI ELEC. CO., LTD.
PRIMARY
R222
R221

19
KX-FP105BX/KX-FP105CX KX-FP105BX/KX-FP105CX
12345678 9 10 11 12
G
F
E
D
C
B
A
H
12. SCHEMATIC DIAGRAM (SWITCHING POWER SUPPLY)...Change from original page 186.
D102
C102 0.1
D202 IC202
PC101
R223
100
C205
1/50
CN301
1
2
3
4
5
6
7
8
24V
24V
24V
GND
GND
GND
5V
GND
C202
D201
T101
TRANS
1000p/1K
GD
S
Q101
D108
D107 10K
R125 R108
15
C103
L101
R101
1M 1/2
C101
0.22 GND
F101
T3.15A 250V
CN31
LN
C104
2200p 2200p
C105
2200p C106
C107
47p
R106
R128
47/1
C201 470/35
C204 47/35 C203
1000/16
R121
10K
R222 2.2K
R221
2.2K
R224
5K
R225
IC201
3.3K
VR201
27K
R205
680/2
PC101
56/400
D101
TH101
D109
R105
0.22/2
R102
R123
R127 C124
1.8K 0.1
C121
R126
5.6K
C122
0.22/16
C123
680p
C109 47/35
4700p
R10382K 82K
R122 R133
R132 150K 150K 150K 120K
R109 D106
R107
68
10
R131 R130 R129
120K 200K/2
R104
200K/2
R110 C108
D105
L103 1000p/1K
150K
220 390
D103 D104
ZNR101
750V
IC101
4
3
2
1
5
6
7
8
Cycle=13 s
12V
0V
Cycle=13 s
540V
0V
Cycle=13 s
11V
19V
0V
Cycle=13 s
25V
48V
0V
20V
36V
0V

20
KX-FP105BX/KX-FP105CX KX-FP105BX/KX-FP105CX
20. ACCESSORIES AND PACKING MATERIALS (Change from original page 201.)
19.2. UPPER CABINET SECTION (Change from original page 196.)
90
93
91
92
92
94
95-1
95-3
95 (See Fig. A.)
95-2
98
97
99
100
101
106
106
102
101
103
108
108
110
110
107
115
113
116-1
116-2
116
109
109 104 105
111
118
117
112
See 19.2.1. PICKUP BASE SECTION.
92
B
B
B
B
B
B
Line A
View A
View A
0.5cm
0.5cm
1
2
3
4
a
b
Stick the sheet
to the side of the holder.
Lastly, fix aand b(jut out from the body)
to the rear completey.
Check the
workmanship. Make sure that these hooks are not covered with the sheet.
1
1) First stick the sheet on the upper part
of the holder. The leading edge of the
sheet should be located within about
±0.5cm from Line A as illustrated .
Fig. A
P2
A5,
A6 (KX-FP105BX only)
90 P3
A1
A8
A7
A2
A3
P4
P5
P6
P8
P7
A4
P1
P2