FLY DS400 Schematic

DG12BT(FLY DS400)_Maintenance Instruction

Prepared by : Tan, Hong Yun
Approved by : Zhang, Guo-Pei
Date: 2008-07-12

TABLE OF CONTENTS

 No power on
 No power on (sub-module)
 Shut off automatically
 Death halt
 No charge
 Quantity of electricity faulty detection
 No display
 LED NG (on the LCD)
 LED NG (on the keyboard)
 Key NG

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 No ring
 No receiving voice
 No sending voice or the voice is small
 No vibration
 Card inefficacy ((Main module)
 Card inefficacy ((Sub-module)
 Camera inefficacy
 Bluetooth inefficacy
 TF card inefficacy

2

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Antenna
( Main module)

Adapter CONN

Socket of PIN card
(main module)

(sub-module)

CPU

Battery CONN

FM area

BT area

Earphone CONN

Camera CONN

Antenna

(sub-module)

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Socket of PIN card &
TF card (sub-module)

FLASH
(sub-module)

Crystal
(sub-module)

RF transceiver

(sub-module)

Ring Chip RF PA (sub-module)

3

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RF PA

(main module)

K/B CONN

CPU

(main module)

FLASH

(main module)

LCD

Receiver

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Transceiver
(main module)

Power supply chip

4

¾No power on

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No power on

Check whether the

battery voltage is

higher than 3.5V

Y

Check whether the battery
and the key pad of J501 is

oxidized or there is

anything else on it

N

Check whether the

connection of K/B &

M/B is OK

N

Take out the LCD and

SPK, Check whether it is

powered on

N

Y

Y

Y

Charge the battery

Wipe off the thing

or clean the key pad

Reassemble

the K/B

Cross-testing the

LCD&SPK,

Change the defective

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N

A

5

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A

C509:1.8V, the capacitor: C509;
C511:2.8V, the capacitor: C511:
C528:2.8V, the capacitor: C528;
C527:2.8V, the capacitor: C527;
C530:2.8V, the capacitor: C530;
C505:1.5V, the capacitor: C505.

Check whether

D501,R548(10K) is

broken

N

Connect with the battery,

press “NO” key, check

whether the output voltage

of U501 is normal

Y

Check whether the

output frequency of

X100 is 32.768K

Y

Check whether the

output voltage of U5

pin3 is 0.58V around

Y

Change the

FLASH(U903) of the

main module, check

whether it is OK

Y

N

N

N

Change D501,R548

Replace a earthed

capacitor corresponding to

the defective pin, Check

whether it is OK

Change X100,

C100,C101

Check whether U5

pin4 has an voltage

of 2.8V around

N

N

Y

Change U501

Change U5,C33,L8

Change U501

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N

Change the

CPU(U100)

OK

6

R502 R504

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R548

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R505 R506

R507

R508

7

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8

¾No power on (sub-module)

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No power on

(sub-module)

D/L the latest edition

(both main &sub module),

Check whether it is OK

N

Check wheth e r

RG106,RG107(47K),

QG101 is broken

N

Check whether there is

anyone in CG120-

CG127 broken

N

Check whether the

output frequency of

XG100 is 32.768K

Y

Y

Y

Y

N

Change the defective

OK

Change RG106,

RG107,QG101

Change XG100,

CG114,CG113

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B

9

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B

Check whether the

output frequency of

XG5 is 26M

Y

Replace with the

programming FLASH

(UG200) of sub-module,

check whether it is OK

N

Change the CPU

(UG100) of sub-module,

check whether it is OK

N

N

Change XG5

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Change the CPU

(U100)

of main module

OK

10

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11

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12

¾Shut off automatically

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Shut off

automatically

D/L the latest edition,

Check whether it is OK

N

Replace with a

good battery, Check

whether the

primary cell is broken.

N

Check whether the

rubber, used to fix the

battery, is lost or at the

other location

N

Check whether the battery
and the key pad of J501 is

oxidized or there is

anything else on them

Y

Y

Change the battery

Y

Y

Reassemble the

Wipe off the thing

or clean the key pad

OK

rubber

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N

C

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C

Check whether the

battery connector ‘J501’ is

void-welded or broken

N

Check whether the

connection of CN601

&K/B FPC is OK,FPC is

void-welded

Y

Check whether there

is any pin of the

connector ‘CN601’

( M/B &K/B) broken

N

Check whether X100

output frequency is

32.768K exactly

Y

N

Y

N

Re-weld or

change J501

Reassemble the K/B

Or change the FPC

Change CN601

ChangeX100,

C100,C101

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Y

Refer to the maintenance

method of ‘No power on’

OK

14

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15

¾Dead halt

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Death halt

D/L the latest edition,

Check whether it is OK

N

Replace with a good

battery, Check whether

the primary cell is broken

N

Check whether the
problem is resulted

from ‘KEY NG’

N

Check whether the
problem is resulted
from the LCD itself

Y

Y

Y

Y

Change the battery

reassemble or change

OK

Clean the K/B,
the metal dome

Change the LCD

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N

D

16