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65

First, operate the PC setting according to The Setting Method of JIG (Handset)(P.61).
Then download the appropriate data according to the following procedures.

(*3) WW: destination code, XXX_YYY: revision number
“XXX_YYY” vary depending on the country version. You can find them in the batch file, PNZZ- mentioned in The Setting
Method of JIG (Handset) (P.61).

(*4) Refer to Check Point (Handset) (P.44)

Items

How to download/Required adjustment

FLASH(IC4)

Programming data is stored in memory.

1) Make sure to connect the JIG cable, then disconnect the DC
Power in order to download the data.
2) Execute the command “flw441 *********.hex”.
3) Connect the DC Power.
4) Press and hold the handset Power key.
5) While holding down the handset Power key, press the PC
Enter key once.
6) After a few minutes, “Successful upgrade” is displayed  on
the PC indicating downloading has finished.
7) Detach the JIG cable, then press the handset Power key to
turn it on.
8) Connect the JIG cable again, and execute the command
"getchk”, then confirm the checksum value is correct.

• If the downloading fails, start again from step 1).

9) Default batch file: Execute the command “default.bat”.
10) Default batch file (remaining): Execute the command
“TGA855RU_DEF_RevXXX_YYY.bat”. (*3).
11) Country version batch file: Execute the command
“TGA855RU_WW_RevXXX_YYY.bat”. (*3).
12) Clock adjustment: Refer to Check Point (H). (*4).
13) 1.8 V setting and battery low detection: Refer to Check
Point (A), (F) and (G). (*4).

EEPROM (IC3)

Adjusted parameter data is stored in memory.
(country version batch file, default batch file,
etc.)

1) Change the address “0001” of EEPROM to “55” to download 
the data.
2) Default batch file: Execute the command “default.bat”.
3) Default batch file (remaining): Execute the command 
“TGA855RU_DEF_RevXXX_YYY.bat”. (*3)
4) Country version batch file: Execute the command 
“TGA855RU_WW_RevXXX_YYY.bat”. (*3)
5) Clock adjustment: Refer to Check Point (H). (*4)
6) 1.8 V setting and battery low detection: Refer to Check Point 
(A), (F) and (G). (*4)

X'tal (X1)

System clock

Clock adjustment data is in EEPROM, adjust the data again
after replacing it.
1) Refer to Check Point (C). (*4)

66

*: Refer to Check Point (Base Unit) (P.41)

**: Refer to Check Point (Handset) (P.44)

Item

Value

Refer to -. *

TX Power

19 dBm ~ 25 dBm

Check Point (Base Unit) (J)

Modulation

-350 ± 50/+350 ± 50 kHz/div

Check Point (Base Unit) (K)

Frequency Offset

±20 kHz

Check Point (Base Unit) (L)

RX Sensitivity

< 1000 ppm

Check Point (Base Unit) (M)

Power RAMP

Power RAMP is matching

Check Point (Base Unit) (N)

Item

Value

Refer to -. **

TX Power

19 dBm ~ 25 dBm

Check Point (Handset) (I)

Modulation

-350 ± 50/+350 ± 50 kHz/div 

Check Point (Handset) (J)

Frequency Offset

±20 kHz

Check Point (Handset) (K)

RX Sensitivity

< 1000 ppm

Check Point (Handset) (L)

Power RAMP

Power RAMP is matching

Check Point (Handset) (M)

67

1. Prepare the digital voltmeter, and set the selector knob to ohm meter.
2. Put the probes at the speaker terminals as shown below.

Channel No. 10: In the Test Mode on Base Unit and Handset.

Receive Frequency

1

1897.344 1897.344 1897.344 1897.344 

2

1895.616 1895.616 1895.616 1895.616 

3

1893.888 1893.888 1893.888 1893.888 

4

1892.160 1892.160 1892.160 1892.160 

5

1890.432 1890.432 1890.432 1890.432 

6

1888.704 1888.704 1888.704 1888.704 

7

1886.976 1886.976 1886.976 1886.976 

8

1885.248

1885.248

1885.248

1885.248

9

1883.520 1883.520 1883.520 1883.520 

Handset speaker (receiver)

Digital Voltmeter

Is the value between
(+) terminal and (–) terminal about 34 

Ω?

RECEIVER:

Is the value between
(+) terminal and (–) terminal about 8 

Ω?

NG

NO

OK

YES

Replace the speaker 
(receiver).

SPEAKER:

68

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.

• 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.

Type 

→ RMA (lower residue, non-cleaning type)

Note: See About Lead Free Solder (Pbf: Pb free) (P.5)

1. Put plenty of solder on the IC pins so that the pins can be completely covered.

If the IC pins are not soldered enough, you may give pressure to the P.C. board when cutting the pins with a cutter.

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.

When you attach a new IC to the board, remove all solder left on the board 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.