16.2.3. Accessories and Packing Materials ------------ 65
16.3. Replacement Parts List -------------------------------- 66
16.3.1. Cabinet and Electrical Parts (Handset)-------- 66
16.3.2. Cabinet and Electrical Parts (Charger unit) -- 66
16.3.3. Accessories and Packing Materials ------------ 66
16.3.4. Handset Board Parts ------------------------------- 67
16.3.5. Charger unit Board Parts ------------------------- 69
16.3.6. Fixtures and Tools ---------------------------------- 69
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KX-TCA175UK
1Safety Precautions
1.1.For Service Technicians
• Repair service shall be provided in accordance with repair technology information such as service manual so as to prevent fires,
injury or electric shock, which can be caused by improper repair work.
1. When repair services are provided, neither the products nor their parts or members shall be remodeled.
2. If a lead wire assembly is supplied as a repair part, the lead wire assembly shall be replaced.
3. FASTON terminals shall be plugged straight in and unplugged straight out.
• ICs and LSIs are vulnerable to static electricity.
When repairing, the following precautions will help prevent recurring malfunctions.
1. Cover plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.
2Warning
2.1.About Lead Free Solder (PbF: Pb free)
Note:
In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that contains 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.
Caution
• PbF solder has a melting point that is 50° ~ 70° F, (3 0° ~ 40°C) higher than Pb solder. Please use a soldering iron with temperature control and adjust it to 700° ± 20° F, ( 3 70 ° ± 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, ( 6 00 °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).
2.1.1.Suggested PbF Solder
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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KX-TCA175UK
2.1.2.Information for Users on Collection and Disposal of Old Equipment and used Batteries
2.2.Battery Caution
1. Danger of explosion if battery is incorrectly replaced.
2. Replace only with the same or equivalent type recommended by the manufacturer.
3. Dispose of used batteries according to the manufacture's Instructions.
2.3.Discarding of P. C. Board
When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.
GAP= (Generic Access Profile)
Power Source:Rechargeable Ni-MH batteryAC Adaptor
Number of Channels:120 Duplex Channels
Frequency Range:1.88GHz to 1.9GHz
Duplex Procedure:TDMA (Time Division Multiple Access)
Battery Life, Handset (if batteries are fully charged):Stand-by: Up to 200 hours (Ni-MH)
Talk: Up to 15 Hours (Ni-MH)
Channel Spacing:1728kHz
Bit rate Spacing:1152kbit/s
Operating Conditions:5~40 °C, 20~80% relative air humidity (dry)
Modulation:GFSK= (Gaussian Frequency Shift Keying)
RF Transmission Power:approx. 250mW
Voice Coding:ADPCM 32 kbit/s
Operation Range:Up to 300 m outdoors, Up to 50 m indoors
Dimensions (D x W x L): 144 mm x 47 mm x 24 mm85 mm x 76 mm x 39 mm
Weight: approx. 125g approx. 65g
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KX-TCA175UK
A
4Technical Descriptions
4.1.Block Diagram (Handset)
Batt
Rear
Speaker
BBIC (SC14428F)
AFEDSP
BMC
1.8V
nt
3.0V
Receiver
Mic
Charge LED
LED(G)
3.0V
LED(R)
Key backlit
3.0V
LED(YG)Tr
J
a
c
k
H/S
detect
H
/
S
Tr
Tr
OP-Amp
Mic Bias
D/A
A/D
Batt
Peripheral
MIDI
Receiving
Calls
Making
Calls
RF I/F
Decoder
Encoder
CR16C
16
PWM
RFmodule
(DECT)
16
ACS0
16
ACS1
16
ACS2
Batt
RF 3.0V
Flash
(32Mbit)
SRAM
(2Mbit)
Color
LCD
Backlit
3.0V
3.0V
3.0V
5.0V
Charger
Circuit
Battery
3.6V
Charge Current
Charge on/off
Batt
Regulator
Power
Management
5.0V
RF 3.0V
Regulator
Batt
Keys
UART
JTAG
Xtal
10.368MH
3.0V
1.8V
KX-TCA175UK BLOCK DIAGRAM (HANDSET)
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4.2.Circuit Operation (Handset)
4.2.1.Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P. 6 ).
• BBIC (Base Band IC): IC3
- All data signals (forming/analyzing ACK or CMD signal)
- Application data and code are temporarily stored.
• Flash ROM (substitute EEPROM): IC2
- Source program data and temporary user data are stored.
• AMPLIFIER IC: IC5
- Single OP_AMP for SPEAKER
•RF Module:
- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for reception
- Amplifier for transmission
4.2.2.Power Supply Circuit/Reset Circuit
When power on the Handset, the voltage is as follows;
BATTERY(3.5 V to 4.2V: Battery+) → Q8 (1.8V) → Q10 (3.0V)
The reset signal is generated with IC3 and Q17.
Power for RF IC (IC601) is generated with IC603.
5.0V for LCD back-light is generated with IC4.
Battery (3.5V to 4.2V) is used for RF Module, Amplifier IC (IC605), DC/DC Converter (IC4).
1.8V is used only for BBIC (IC3).
3.0V is used for BBIC (IC3), LCD, SRAM (IC1), Flash ROM (IC2), Red LED, Green LED, Key back-light.
"Battery Low" and "Power Down" are detected by BBIC (IC3) which checks the battery voltage.
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 3.5V ± 50mV
The BBIC detects this level and "" starts flashing.
• Power Down
Battery voltage: V(Batt) 3.3V ± 50mV
The BBIC detects this level and power down.
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4.2.5.TX Audio Path
Microphone
An audio signal from microphone is input to pin 118 (MIC+) of IC3 via headset jack (CN1).
In IC3, the audio signal is converted from the analog signal to ADPCM, then to burst data, and sent from pin 28 (TXDA) to RF
Module. The stabilized supply voltage is fed to the microphone from pin 119 (VREF+) of IC3.
To reduce consumption current, this voltage is supplied only while calling or receiving.
Headset
When a headset is inserted, a signal from microphone is cut off and an audio signal from a headset is input to pin 118 (MIC+).
Headset detection
When a headset is inserted, pin 41 (ADC2) of IC3 goes from Low to High (around 1V) and BBIC (IC3) detects the insertion of
the headset.
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• LCD Circuit
• The LCD is controlled by 5 control signal (READ, WRT, A0, LCD_CS, LCD_RST) and Data bus.
• LCD back-light is controlled by IC3-79pin, and this PWM signal controls back-light brightness.
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4.2.6.RX Audio Path
Receiver
Burst data is input from RF Module to pin 26 (RXDA) of IC3.
In IC3, the burst data is converted to ADPCM, then to analog signal, and sent from pin 110 (LSR+) and pin 111 (LSR-) to the
receiver.
Headset
When the headset is inserted, a signal to the receiver is cut off and audio signal from pin 110 (LSR+) of IC3 is input to the
headset.
Speakerphone
In Speakerphone mode, the BBIC (IC3) makes pin 1 of IC5 from Low to High.
And an audio signal from pin 112 (LSR_HS) of IC3 is sent to a monitor speaker through speaker Amplifier IC (IC605).
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•LED Circuit
BBIC (IC3) controls each LEDs.
Call/Charge Indicator LED (Green), D1 IC3-81pin = High
Call/Charge Indicator LED (Red), D1IC3-80pin = High
Key back-light LEDs (Yellow)
D3-D10, D17-D24
Type of LEDLED ONLED OFF
IC3-81pin = Low
Q6 = ON
Q7 = ON
IC3-42pin = High
Q12 = ON
Q6 = OFF
IC3-80pin = Low
Q7 = OFF
IC3-42pin = Low
Q12 = OFF
4.2.7.Ringer Circuit
During ringing, a signal is sent from pin 112 of IC3 to a monitor speaker through speaker Amplifier IC (IC5). At this time, BBIC
(IC3) makes pin 1 of IC5 from low to high.
4.2.8.Key Click Sound Circuit
When the key is pushed, a signal is sent from pin 12 of IC3 to a monitor speaker through speaker Amplifier IC (IC5). At this
time, BBIC (IC3) makes pin 1 of IC5 from low to high.
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5Location of Controls and Components
5.1.Handset
KX-TCA175UK
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6Installation Instructions
6.1.Charger Connection
Connect the AC adaptor to the charger.
• The AC adaptor should be connected to a vertically oriented or floor-mounted AC outlet.
Do not connect the AC adaptor to a ceiling-mounted AC outlet, as the weight of the
adaptor may cause it to become disconnected.
• Fasten the AC adaptor cord to the cord holder.
• Use only the included Panasonic AC adaptor (PQLV219E).
6.2.Battery
6.2.1.Battery Installation
Insert the batteries, and close the cover as indicated below.
KX-TCA175UK
6.2.2.Charging the Battery
At the time of shipment, the battery is not charged.
Please charge the battery for about 7 hours before using the handset for the first time.
• When the battery has been completely charged, the charge indicator will change from red to green.
• It is normal for the handset and charger to feel warm while the battery is charging.
• Keep devices sensitive to magnetic fields away from the charger.
• Use only the included charger.
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6.2.3.Battery Information
After your Panasonic battery is fully charged [at 25°C]:
OperationOperating Time
While in use (Talk)Up to about 15 h
While not in use (Standby)Up to about 200 h
• Operating time may be shorter than listed above depending on usage conditions and ambient temperature.
• The battery will drain slowly even while the handset is turned off.
• The handset can receive calls while charging.
• Battery consumption increases when the handset is used out of range. If "" flashes, turn the handset off.
6.2.4.Low Battery Warning
The battery needs to be charged in the following situations:
• “ “ flashes, and the alarm sounds*1.
• "Charge Battery" is displayed. In this situation, the handset cannot be operated.
*1 If the low battery warning occurs during a conversation, the call will be automatically disconnected one minute after the alarm
sounds.
6.2.5.Replacing the Batteries
If " "flashes after using the phone for a short time, even when the battery has been fully charged, the battery should be
replaced.
Before replacing the battery, make sure the low battery warning is displayed, then turn off the power to prevent memory loss.
Replace the battery and charge the new battery for about 7 hours.
If you replace the battery before the low battery warnings appears, the battery strength icon may display an incorrect reading. In
this case, use the handset as normal with the new battery installed. When the low battery warning is displayed, charge the battery for about 7 hours. The battery strength icon will then display the correct reading.
1. Turn the power off to prevent memory loss.
2. Press the notch on the cover firmly and slide it as indicated by the arrow (A).
3. Open the cover and replace the batteries.
• Insert a finger into the side gap to remove the batteries easily (B).
4. Close the cover and charge the handset.
• Please use a Panasonic battery with the service part number HHR-4EPT only.
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7Operating Instructions
7.1.Soft Keys
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7.2.Handset Setting Menu Layout
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7.3.Key Lock
You can lock all keys other than the Navigator Key while the handset is in standby mode.
• If you select "Manual&Password" or "Auto & Password" for Key lock type, you need to enter the password for unlocking.
• If no password has been set, you cannot select "Manual & Password"or "Auto & Password" for Key lock type.
7.4.Selecting the Display Language
You can select the language displayed on your handset.
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7.5.DISPLAY
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7.6.Function Menus
Press the Navigator Key to display the main and sub menus.
7.6.1.Main Menu-While in Standby Mode
7.6.2.Sub Menu-While Off-hook/During a Conversation
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7.7.Function Keys
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7.8.Flexible Keys
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7.9.Caller ID
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7.10.Character Mode Table
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8Troubleshooting Guide
KX-TCA175UK
Note:
When you find the suspected parts, check the soldering and resolder or replace the parts if it is necessary.
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8.1.Power Trouble (Handset)
8.1.1.Power Does Not Go On
The symptom is No Lite (LED OFF), No Display, No Sound.
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• Charger Unit
• NO Display On the LCD
KX-TCA175UK
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KX-TCA175UK
• 5V Circuit
8.2.Battery Charge Trouble (Handset)
8.2.1.Charge On
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8.2.2.Charge Off
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8.3.LED Trouble (Handset)
8.3.1.Key Back-Light
8.3.2.Charging And Ringing LED
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8.4.Ringer Trouble (Handset)
Check ringer volume setting and setting at first.
KX-TCA175UK
Key Click Sound Troubleshooting is same method.
Check Keyfone setting of handset at first.
8.5.No Voice Transmission
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KX-TCA175UK
8.6.No Voice Reception
8.6.1.Talk Mode
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8.6.2.Speakerphone Mode
KX-TCA175UK
8.7.Password Trouble
8.7.1.User Password is forgotten.
Test command "PWC" set user password to "1234".
8.7.2.System Lock Password is forgotten.
Test command "SLC" unlock the system lock.
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KX-TCA175UK
9Service Fixture & Tools
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10 Disassembly and Assembly Instructions
10.1.Handset
KX-TCA175UK
Shown in Fig.-To RemoveRemove
1Rear CabinetScrews (2 × 8)..........(A) × 4
2Follow the procedure.
3Main P.C. BoardMain P.C. Board
10.2.Charger Unit
Shown in Fig.-To RemoveRemove
4Lower CabinetScrews (2.6 × 12)..........(B) × 2
5Main P.C. BoardMain P.C. Board
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KX-TCA175UK
11 Measurements and Adjustments
11.1.Check Procedure (Handset)
11.1.1.Preparation
11.1.1.1.Equipment Required
• DECT tester: Rhode & Scorers, CMD 60 is recommended.
• Frequency counter: it must be precise to be able to measure 1Hz (precision; ±4ppm).
Hewlett Packard, 53131A is recommended.
• DC power: it must be able to output at least 1A current under 3.8V for Handset, 9V for Tool.
• Digital multi-meter (DMM): it must be able to measure voltage and current.
• Oscilloscope
11.1.1.2.Tool and PC
• EEPROM serial Tool
Tool: PSZZ2CA155EU
• PC which has “flash program.exe”.
11.1.2.PC Setting
11.1.2.1.Connections
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11.1.3.Download Manual
11.1.3.1.Step [1] Before Downloading (Configuration Setting)
[1]-(1) Execute "Flash Program.exe"
KX-TCA175UK
11.1.3.2.[1]-(2) Press Config
[1]-(3) Press OK
Selected item will be stored.
Connect the download PC cable with selected come port (COM1-COM9).
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11.1.3.3.Step [3] Select Download file
[3]-(1) Download Program Main Menu
Push "Reference" to select the download file. (Download Filename tca275vXXX.hex) XXX=Version
Select [program All] for [erase type].
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11.1.3.4.Step [4] Download Start
[4]-(1) Click "download" key
[4]-(2) Turn the power of target (TCA275) to [OFF]
(Keep pressing "POWER" key for while 2 seconds)
[4]-(3) Keep pressing "POWER" key until step [4]-(6)
This operation will not turn the power of target to on.
If target power turns on, check following item. Then try again from step [1]-(1).
(A) Check serial PC cable connection "PC" with "TCA275".
(B) Check Configuration. (Refer to Step [1]-(2))
(C) Check PC cable attachment of target.
[4]-(4) Click "Download"
Communicating PC with Target.
Don't release the "POWER" key in this step. If release the "OFF" key, downloading will be failed.
KX-TCA175UK
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[4]-(5) Communication check "OK"
If communication check become "OK", Display will show "CRC OK".
If communication NG, click "cancel" key, then back to step [4]-(1) and try download again.
Erase the flash ROM.
You can release the "POWER" key in this step.
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[4]-(6) Downloading Start
After several seconds, Display shows "Flash Program Start".
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[4]-(7) Downloading Complete
If downloading finished, display shows "Download finished successfully!".
Click "OK" then disconnect the serial PC cable.
11.2.Adjustments (Handset and Charger Unit)
11.2.1.Adjustment (Handset)
When you change IC3, you must adjust (A)(F)(H)(I)(K)
ItemsAdjustment
Point
(A)* 1.8V Supply Confirma-
tion
(B) 3V Supply ConfirmationCK181. Confirm that the voltage between "CK18" and GND is 3.0V±0.15V.IC3, Q10,
(C)* Software Confirmation-1. BBIC Confirmation (Execute the command "SLF", and “VER”).
(D) Charge Control Check &
Charge Current Monitor
Confirmation
(E)* Charge Detection (OFF)
Confirmation
(F)* Battery Monitor Confir-
mation
CK171. Confirm that the voltage between test point "CK17" and GND is 1.8V±0.02V.
2. Adjust the 1.8V voltage of CK17 executing command "VDD XX" (XX is the
value).
2. Confirm the returned checksum value.
Connection of checksum value and software version is shown below.
-1. Apply 6V between CN3(+) and CN4(-) with current limit of PSU to 200mA.
2. Confirm that the charge current is ON/OFF.
3. SW to decrease current limit of PSU to 100mA.
4. Confirm that the charge current is stable.
-1. Stop supplying 6V to CN3(+) and CN4(-).
2. Execute the command "BTS".
3. Confirm that the returned value is 0x00 (hex).
-1. Apply 3.5V ± 0.02V between BATT(+) and BATT(-).
2. Execute the command "LED 0", then "AD1".
3. Confirm:
20 returned value 38 (Hex)
4. Adjust the Battery Monitor executing command.
(XX=returned value, YY=XX-9(hex))
WB2 XX
WB4 XX
WB3 YY
(G) Battery low Confirmation-1. Apply 3.55V between BATT(+) and BATT(-).
(H)* BBIC Clock AdjusmentSYRI1. Execute the command "RFC 1".
(I)* Modulatoin Check and
Adjusment
(J)* RSSI Level Confirmation-Follow steps 1 to 3 of (I) above.
(K) RSSI Calibration Confir-
mation
(L) Country setting1. Excute the command "DCS 1"
-1.Set RFPI to 0102030405 in CMD60.
-1. Set DECT Tester Power to -93dbm.
2. Confirm that there is no flashing of Battery Icon.
3. Apply 3.4V between BATT(+) and BATT(-).
4. Confirm that there is flashing of Battery.
2. Adjust the frequency of SYRI executing the command "SFR xx (where xx is
the value)" so that the reading of the frequency counter is 10.368000MHz
±10Hz.
2.Excure the command “TST 01 02 03 04 05”.
3.Press “Set up connection” at CMD 60.
4.Confirm that the B-Field Modulation is 360kHz/div~380kHz/div using data
type Fig 31.
5.Adjust the B-Field Modulation if required. (Execute the command "SMR xx",
where xx is the value.)
4.Set DECT tester power to -93dBm.
5.Execute the command "RSS".
6.Confirm that the returned value is 0x8±8 (hex).
7.Set DECT tester power to -63dBm.
8.Execute the command "RSS".
9.Confirm that the returned value is 0x1D±8 (hex).
2. Run "RSS" and record the returned value.
3. Run follwing command and verify the value xx is returned value is step2.
EPW 00 69 1 XX
EPR 00 69 00 01
4. Set DECT Tester Power to -63dbm.
5. Run "RSS" and record the returned value.
6. Run follwing command and verify the value xx is returned value is step5.
EPW 00 6A 1 XX
EPR 00 6A 00 01
Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
12.1.1.Preparation
• PbF (: Pb free) Solder
• Soldering Iron
Tip Temperature of 700°F ± 20°F (370°C ± 10°C)
Note: We recommend a 30 to 40 Watt soldering iron. An
expert may be able to use a 60 to 80 Watt iron where someone with less experience could overheat and damage the
PCB foil.
•Flux
Recommended Flux: Specific Gravity → 0.82.
Typ e → RMA (lower residue, non-cleaning type)
Note: See About Lead Free Solder (PbF: Pb free) (P.3).
12.1.2.Removal Procedure
1. Put plenty of solder on the IC pins so that the pins can be
completely covered.
Note:
If the IC pins are not soldered enough, you may give
pressure to the P.C. board when cutting the pins with
a cutter.
12.1.3.Procedure
1. Tack the flat pack IC to the PCB by temporarily soldering
two diagonally opposite pins in the correct positions on
the PCB.
Be certain each pin is located over the correct pad on the PCB.
2. Apply flux to all of the pins on the IC.
2. Make a few cuts into the joint (between the IC and its
pins) first and then cut off the pins thoroughly.
3. While the solder melts, remove it together with the IC
pins.
3. Being careful to not unsolder the tack points, slide the soldering iron along the tips of the pins while feeding enough
solder to the tip so that it flows under the pins as they are
heated.
12.1.4.Removing Solder From Between
Pins
1. Add a small amount of solder to the bridged pins.
2. With a hot iron, use a sweeping motion along the flat part
of the pin to draw the solder from between the adjacent
pads.
When you attach a new IC to the board, remove all solder
left on the land with some tools like a soldering wire. If some
solder is left at the joint on the board, the new IC will not be
attached properly.
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12.2.Terminal Guide of the ICs Transistors and Diodes
1. RTL (Retention Time Limited)
The "RTL" marking indicates that its Retention Time is
Limited.
When production is discontinued, this item will continue to
be available only for a specific period of time.
This period of time depends on the type of item, and the
local laws governing parts and product retention.
At the end of this period, the item will no longer be available.
2. Important safety notice
Components identified by the mark indicates special
characteristics important for safety. When replacing any
of these components, only use specified manufacture's
parts.
3. The S mark means the part is one of some identical parts.
For that reason, it may be different from the installed part.
4. ISO code (Example: ABS-94HB) of the remarks column
shows quality of the material and a flame resisting grade
about plastics.
5. RESISTORS & CAPACITORS
Unless otherwise specified;
All resistors are in ohms (Ω), k=1000Ω, M=1000kΩ
All capacitors are in MICRO FARADS (µF), p=µµF
*Type & Wattage of Resistor
Safety Ref.
No.
115PSHR1357Z SPACER,ANTENNA ABS-HB
116PSHS1081Z TAPE,BOTH SIDE
117PSHS1086Z TAPE,BOTH SIDE