1

START

Rx TEST SETUP(HHP) - Test Channel : 384 - Test Band : US Cellular - SID :22 - Sector Power : -30 dBmSpectrum Analyzer SettingOscilloscope Setting

1. Check DC Power supply circuit

2. Check RF Signal path

3. Check TCXO Circuit

4. Check Control signal

5. Check Rx I/Q data

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4.1.1 DCN RX

Checking Flow

Test Point

4.1 Rx Part Trouble

CHAPTER 4. Trouble Shooting CHAPTER 4. Trouble Shooting

Figure 4.1.1.1

2

4.1.1.1 Checking DC Power supply Circuit

Circuit Diagram

Test Point Checking Flow

Check Pin 5of U110

+2.9V_Rx OK?

NO

+2.6V_MSMP2 is OK?

YESThe Problem may

be Logic partRefer to Logic trouble shooting

Check Pin 48of U110

YES NOU110. 5

U110. 48

The Problem may be Logic part

Refer to Logic trouble shooting

DC Power supply Circuit is OK . See next Page to

check RF Path.

Figure 4.1.1.2

3

4.1.1.2 Checking RF Signal path

Test Point Checking Flow

U115. 2Detected Signal?

Check U115 Pin 2

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.1(a)

NOChanging U115

U110. 23&24

YES

Detected Signal?

Check U101 Pin 2

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.1(a)

NO Check C102Check L104

DP100. 6

Check DP100 Pin 6

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.1(a)

Detected Signal?

YES

NOChanging U101Changing U141Check C103Check L105Check L114YES

Detected Signal?Check U110Pin 33

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.1(b)

U110. 33

NO Changing DP 100Check C140& C142 & L119& L129

Detected Signal?NO Changing U110

Check L123 & C125

YES

Check F102 Pin 1

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.1(c)

F102. 1

Detected Signal?NO Changing F102

Check C148 & C149Check L126 & L137

YES

Check U110 Pin 23

Check U110 Pin 24

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.1(d)

YES

RF Signal Path is OK . See next Page to

check VCTCXO Circuit.Figure 4.1.1.3

U101. 2

4

Graph 4.1.1(c) Graph 4.1.1(d)

Graph 4.1.1(b)Graph 4.1.1(a)

Waveform

5

4.1.1.3 Checking TCXO Circuit

Test Point

Graph 4.1.1(e)

+2.8V OK?

YES

Checking Flow(TCXO)

Similar?

Waveform

Check X100 Pin 3 ◆ Refer to Graph 4.1.1(e)

Check X100 Pin 4

TCXO Circuit is OK .

No

NO The Problem may be Logic partRefer to Logic trouble shooting

YES

Changing X100Check R110

Similar?Check X100 Pin 3 ◆ Refer to Graph 4.1.1(e)

NO

YES

TCXO Circuit is OK .

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Circuit Diagram

Figure 4.1.1.4

X100, 4

X100, 3

6

4.1.1.4 Checking Control signal

Test Point

Checking Flow

Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110.

Check if there isAny Major Difference◆ Refer to Graph 4.1.1(g.h)

Similar?

NO

YES

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Control Signal is OkSee next Page to Check

RX I&Q Data

U110. 51U110. 50U110. 49

Figure 4.1.1.5

Similar?YES Control Signal is Ok

See next Page to CheckRX I&Q Data

NO

Replace Board

Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110.

Check if there isAny Major Difference◆ Refer to Graph 4.1.1(g.h)

7

Waveform

SBCK

SBST

SBCK

SBDT

Graph 4.1.1(g) Graph 4.1.1(h)

Circuit Diagram

8

START

Rx TEST SETUP(HHP) - Test Channel : 600 - Test Band : US PCS - SID :4182 - Sector Power : -30 dBmSpectrum Analyzer SettingOscilloscope Setting

1. Check DC Power supply circuit

2. Check RF Signal path

3. Check TCXO Circuit

4. Check Control signal

5. Check Rx I/Q data

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4.1.2 PCS RX

Checking Flow

Test Point

Figure 4.1.2.1

9

4.1.2.1 Checking DC Power supply Circuit

Test Point Checking Flow

Check Pin 5of U110 +2.9V_Rx OK?

NO

+2.6V_MSMP2 is OK?

YESThe Problem may

be Logic partRefer to Logic troubleshoot

Check Pin 48of U110

YES NO The Problem may be Logic part

Refer to Logic troubleshoot

DC Power supply Circuit is OK . See next Page to check RF Path.

Circuit Diagram

U110. 5

U110. 48

Figure 4.1.2.2

10

4.1.2.2 Checking RF Signal path

Test Point Checking Flow

Detected Signal?

Check U115 Pin 2

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.2(a)

NOChanging U101

YES

Detected Signal?

Check U101 Pin 2

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.2(a)

NOCheck C102Check L104

Check DP101 Pin 3

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.2(a)

Detected Signal?

YES

NO Changing U101Changing U142Check C114Check L151

YES

Detected Signal?Check U110 Pin 31

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.2(b)

NO Changing DP 101Check C141 & L120, L130

Detected Signal?NO Changing U110

Check C128Check C129, L126

YES

Check F103 Pin 1

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.2(c)

Detected Signal?NO Changing F103

Check C150 , C154Check L138, L139

YES

Check U110 Pin 25

Check U110 Pin 26

Check if there is

Any Major Difference

◆ Refer to Graph 4.1.2(d)

YES

RF Signal Path is OK . See next Page to

check VCTCXO Circuit.

Figure 4.1.2.3

U115. 2

U110. 25&26

DP101. 3

U110. 31

F103. 1

U101. 2

11

Graph 4.1.2(c) Graph 4.1.2(d)

Waveform

Graph 4.1.2(a) Graph 4.1.2(b)

12

4.1.2.3 Checking TCXO Circuit

Graph 4.1.2(e)

Figure 4.1.2.4

Test Point

+2.8V OK?

YES

Checking Flow(TCXO)

Similar?

Waveform

Check X100 Pin 3 ◆ Refer to Graph 4.1.2(e)

Check X100 Pin 4

TCXO Circuit is OK .

No

NO The Problem may be Logic partRefer to Logic troubleshoot

YES

Changing X100Check R110

Similar?Check X100 Pin 3 ◆ Refer to Graph 4.1.2(e)

NO

YES

TCXO Circuit is OK .

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Circuit Diagram

X100, 4

X100, 3

13

4.1.2.4 Checking Control signal

Figure 4.1.2.5

Test Point

Checking Flow

Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110.

Check if there isAny Major Difference◆ Refer to Graph 4.1.2(g.h)

Similar?

NO

YES

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Control Signal is OkSee next Page to Check

RX I&Q Data

U110. 51U110. 50U110. 49

Similar?YES Control Signal is Ok

See next Page to CheckRX I&Q Data

NO

Replace Board

Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110.

Check if there isAny Major Difference◆ Refer to Graph 4.1.2(g.h)

14

Waveform

SBCK

SBST

SBCK

SBDT

Graph 4.1.2(g) Graph 4.1.2(h)

Circuit Diagram