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17

Each item (1 ~ 2) of Check GSM RF part corresponds to Check Table for GSM RF part (P.17).

No.

Item

Handset Check

1

Link Confirmation

Using GSM tester

1. Bell signal input from GSM tester.
2. Push TALK key of Handset.
3. Check Talk between Handset and GSM tester.

2

Range Confirmation

Using GSM tester

1. Check (J) to (W).
2. Check Antenna Direction on PCB.
3. Check C5, L4, L6, C14, L9.

Start

Link

confirmation

1

 Range

confirmation

Check Range: Compare with a regular unit.

Check GSM Link

GOOD

2

NG

NG

OK

OK

18

Signal Route (P.11)

How to Check the Handset Speaker or Receiver (P.30).
Signal Route (P.11)

Signal Route (P.11)

How to Check the Handset Speaker or Receiver (P.30).
Signal Route (P.11)

OK

Check MIC of Handset.

Check TX ROUTE (HANDSET) in Signal Route.

Check Headset Speaker in How to check the Handset 
Speaker or Receiver.

OK

Check RX ROUTE (HANDSET) in Signal Route.

Check MIC of Headset.

OK

Check HEADSET TX (HANDSET) in Signal Route.

Check Headset Speaker in How to check the Handset 
Speaker.

OK

Check HEADSET RX (HANDSET) in Signal Route.

19

GMS Module (P.9)
How to Check the Handset Speaker or Receiver (P.30)

Does the bell sound from SPEAKER?

Check around SP+, SP-

When bell signal coming, is there bell sound signal
at SP+(testpoint), SP-(testpoint)? 

NO

YES

Check around MODULE (MOD1)

NO

Check cable of SPEAKER and resistance value 
of SPEAKER

20

If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have GSM tester
(*1) or not. 

(*1) A general repair is possible even if you don’t have the GSM tester because it is for confirming the levels, such as Acoustic
level in detail.
(*2) Refer to Check Point (Handset) (P.20)

After the measuring, suck up the solder of TP.
The connections of simulator equipment are as shown in Handset Reference Drawing (P.27).

Check item (A)-(F), (X).

Check item (A)-(F), (X).

Check item (G)

Check item (H)

Check item (I)

Check item (A)-(C).

Check item (J)-(W).

-

-

-

Check item (A)-(C).

Check item (J)-(W), (G)-(I).

Remedy (*2)

Symptom

You don't have GSM Tester

You have GSM Tester

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)

2.0V Supply Confirma-

tion

VRTC

1. Confirm that the voltage between test point VRTC and GND is 2.0 V ± 0.14 V.

MOD1

(B) 2.85V Supply Confirma-

tion

VIO

1. Confirm that the voltage between test point VIO and GND is 2.85 V ± 3%.

MOD1

(C) SIM card Supply Confir-

mation

VSIM

1. Confirm that the voltage between test point VSIM and GND is 2.85 V ± 3%

(3.0V type SIM card) or 1.8 V ± 3% (1.8V type SIM card).

MOD1

(D)

Charge Control Check

-

1. Connect 10k

Ω resistor between TH and GND.

2. Connect 6.8

Ω/4W resistor between VBAT and GND.

3. Apply 3.8V between VBAT and GND with DC power supply.
4. Apply 5.5V between CHARGE+ and CHARGE- with DC power supply.

(Apply 5.5V between DCIN and GND with DC power supply.)

5.  Confirm that the Charge Current is 380mA±50mA.

MOD1, L1, L2, 

Q1, R10, D1,

F2, IC1, IC2,

R1, R2, R3, L3

(E) Charge Detection (OFF)

Check

-

1. Stop supplying 5.5V to CHARGE+ and CHARGE-.

(Stop supplying 5.5V to DCIN and GND.)

2. Confirm that the charge indicator goes off.

MOD1, L1, L2, 

Q1, R10, D1,

F2, IC1, R5

(F)

Battery Low Confirma-

tion

-

1. Apply 3.60 V between BAT+ and BAT-.
2. Confirm that there is no flashing of Battery Icon.
3. Apply 3.45 V between BAT+ and BAT-.
4. Confirm that there is flashing of Battery Icon.

MOD1, F1

(G) Audio Check and Confir-

mation 

-

Using GSM tester
1) Link with Handset

• Bell signal input from GSM tester
• Push TALK-Key

(H) Audio Check and Confir-

mation

(Speakerphone)

-

Using GSM tester
1) Link with Handset

• Bell signal input from GSM tester
• Push Speakerphone-key

(I) Audio Check and Confir-

mation

(Headset)

-

Using GSM tester
1) Link with Handset

• Bell signal input from GSM tester
• Push TALK-Key
• Connect the Headset