Laboratory Exercises

Introduction
This document has been prepared to provide learning technicians the hands-on- training  skills necessary to effectively troubleshoot the A845 cellular transceiver. The reader of this document should have already participated in a level 3 technical training session that discussed the theory of operation, testing, and programming of the A845. If such training has not been taken yet, contact your local training coordinator to schedule a technical training session.

It is required that the reader of this document is already familiar with test equipment related to radio communications. This includes the following:

n	Oscilloscope
n	Multimeter
n	Spectrum Analyzer
n	Cellular communications Analyzer
n	Frequency counter

Hardware requirements
In order to successfully complete the laboratory exercises, the following hardware will be needed. 

UMTS A845	
Torx #6 driver	USB Data Cable (SKN6311A)	
Plastic disassembly tool (6680388B67)	Battery (SNN5639B)	
RF Connector (2887920K01)	Charger (SPN4049A)	
UMTS Test USIM		

If this hardware is not available, contact your local parts administrator for ordering information.

Lab 1 (GSM Measurements)
Call Processing Setup
Use the following procedures for call processing.

1.	Install the test USIM and battery on phone.
2.	Connect the RF cable from the phone to the test instrument.
3.	Setup up the test box for GSM, DCS, or PCS Signalling.
4.	Set Broadcast Channel (BCH) to 194 (GSM850),  700 (DCS), or 661 (PCS).
5.	Set Broadcast channel level to -85dBm.
6.	Set Traffic Channel (TCH) to 128 (GSM850) or 512 (DCS/PCS).
7.	Wait until the phone indicates a receive signal.
8.	Dial a number from the phone and press the send button.
9.	The phone is now connected.

GSM850 (Setup channels for GSM850)
1.	Read Burst Average Power 		Power _____________dBm
2.	Verify Burst Output Shape  		Pass / Fail 	(circle one)
3.	Read RMS Phase Error			Phase Error ____________	deg
4.	Read Frequency Error			Frequency Error___________Hz
5.	Read RX Quality@-105dBm		RX Quality___________
(set BCH level to -105dBm)

GSM1900 (Setup channels for PCS)
1.	Read Burst Average Power 		Power _____________dBm
2.	Verify Burst Output Shape  		Pass / Fail 	(circle one)
3.	Read RMS Phase Error			Phase Error ____________	deg
4.	Read Frequency Error			Frequency Error___________Hz
5.	Read RX Quality@-104dBm		RX Quality___________
(set BCH level to -104dBm)

Handover
Perform the following handover procedures.

Band	From 	To 	
	Traffic 
Channel	Power 
Control	Traffic 
Channel	Power 
Control	
GSM850	128	5	251	19	
 DCS	512	0	885	15	
PCS	512	0	810	15	

Pass / Fail	 (circle one)
Pass / Fail	 (circle one)
Pass / Fail	 (circle one)
GSM Manual Measurements
GSM TX Power
Use RadioComm to send the following commands.
1.	SUSPEND
2.	CP_MODE - Click on 1900 (PCS)
3.	LOAD_SYN - Enter 661 (PCS) and then click Set
4.	SET_RF_PWR - Enter 0 (DCS/PCS) and then click Set
5.	CARRIER - Select 06 and then click ON

Read PCS TX Power		TX Power______________________dBm

GSM850 RSSI
Setup test instrument with following parameters,

Broadcast Channel (BCH): 		  194
Broadcast Channel (BCH) Level:	-105 dBm

Use RadioComm to send the following commands.
1.	SUSPEND
2.	CP_MODE - Click on 850/1900
3.	SCMP - Enter Channel 194 and click INIT
4.	RQEP - Click Execute

Read GSM850 RSSI		RSSI_____________________dBm

Lab 2 (UMTS Measurements)

Setup
Use the following procedures for call processing.

1.	Install the test USIM and battery in phone.
2.	Connect the RF cable from the phone to the test instrument
3.	Setup up the test box for WCDMA FDD Signalling
4.	Set RF Channel Uplink to 9400
5.	Set RF Channel Downlink to 9800
6.	Power up phone
7.	Wait until the phone indicates a signal
9.	Dial a number from the phone and press the send button.
10.	The phone is now connected.
UMTS Parameters
1.	Read Average RMS Power. 		Power _____________dBm
2.	Read Average Frequency Error  		Frequency Error___________Hz
3.	Read Average RMS EVM		EVM ____________	%
4.	Read Average RMS ACLR-2		ACLR-2___________dB	
5.	Read Average RMS ACLR-1		ACLR-1___________dB
6.	Read Average RMS ACLR+1		ACLR-1___________dB
7.	Read Average RMS ACLR+2		ACLR+2___________dB

UMTS Manual Measurements
UMTS TX Power
Use RadioComm to send the following commands.
1.	SUSPEND
2.	CP_MODE - Click on W1900
3.	For W_CARRIER assign these actions to each field, click Set after entries are complete
Freq ID (Dec)			9400
Action				Enable
Channelization		Enable
Data Pattern			PN 9
Scrambling			Long
DPCCH			SF256, SF0
DPDCH			SF256, SF0
Channelization Code		00
Transmit Power		FB
Max Power			15		
Min Power			80
Scram Code			00

Read WCDMA TX Power		WCDMA TX Power____________dBm

UMTS RSSI
Setup test instrument with following parameters,

Downlink Channel: 			 9800
Downlink Channel Level:		-105 dBm

Use RadioComm to send the following commands.
5.	SUSPEND
6.	CP_MODE - Click on W1900
7.	WSCMP - Enter Freq ID 9800 and click Start
8.	RSSI_RSCP – Select 01(RSSI_COMP) and click Get
9.	Convert value from Hex to decimal
10.	Subtract result from 65535
11.	Enter result below

WCDMA RSSI Reading__________dBm

Lab 3 (Handset Test Commands)
Melody Speaker Test
Enter handset test mode and issue following commands

0*1*265	Play SONATA_IN_C
0*0*265	Stop SONATA_IN_C

Verify operation					Pass / Fail	(circle one)

Vibrator Test
Enter handset test mode and issue following commands
54			Suspend
3*0*1			Enable Vibrator
3*0*0			Disable Vibrator

Verify operation					Pass / Fail	(circle one)

Handset Mic/Speaker test
Enter handset test mode and issue following commands
54			Suspend
6*2*2		Enable internal mic and handset speaker
4*7*1*16		Enable VOCODER loopback at Enhanced Full Rate

Verify audio loopback					Pass / Fail	(circle one)

Mono Headset Mic/Speaker test
Insert mono headset accessory in headphone jack.

Enter handset test mode and issue following commands
54			Suspend
6*4*6		Enable headset mic and headset speaker
4*7*1*16		Enable VOCODER loopback at Enhanced Full Rate

Verify audio loopback					Pass / Fail	(circle one)

Stereo Headset Mic/Speaker test
Insert stereo headset accessory in headphone jack.

Enter handset test mode and issue following commands
54			Suspend
6*4*8		Enable headset mic and headset speaker
4*7*1*16		Enable VOCODER loopback at Enhanced Full Rate

Verify audio loopback					Pass / Fail	(circle one)

Display Backlight test
Enter handset test mode and issue following commands
54			Suspend
55*9*000		Backlight Off
55*9*001		Backlight On, full intensity

Press the right soft key to return to the opcode screen.

Verify operation					Pass / Fail	(circle one)

Display Color test
Enter handset test mode and issue following commands
54			Suspend
55*2*014		Eight Color Box Pattern

Press the right soft key to return to the opcode screen.

Verify edges (uniform/smooth)			Pass / Fail	(circle one)

Display Linearity test
Enter handset test mode and issue following commands
54			Suspend
55*2*005		Grey Scale Block

Press the right soft key to return to the opcode screen.

Verify smooth transition from dark to light		Pass / Fail	(circle one)

Display Flicker test
Enter handset test mode and issue following commands
54			Suspend
55*2*006	Horizontal Zebra Line

Press the right soft key to return to the opcode screen.

Verify that no noticable flicker exists			Pass / Fail	(circle one)

Display Pixel Defect test
Enter handset test mode and issue following commands
54			Suspend
55*2*001		All pixels on (all white)
55*2*000		All pixels off (all black)

Press the right soft key to return to the opcode screen.

Verify that less than 3 pixel defects			Pass / Fail	(circle one)

Keypad Backlight test
Enter handset test mode and issue following commands
54						Suspend
62*0*1(leave next field blank)		Enable Keypad Backlight
62*0*0(leave next field blank)		Disable Keypad Backlight

Verify operation					Pass / Fail	(circle one)

Lab 4 (RadioComm)
Melody Speaker Test (TAB 4)
Using RadioComm issue the following commands

1.	AUD_TN_LIST -  Enter 109 and click Enable	

Verify operation					Pass / Fail	(circle one)

Vibrator Test (TAB 4)
Using RadioComm issue the following commands

1.	SUSPEND
2.	AUD_CTRL – Click Vib ON

Verify operation					Pass / Fail	(circle one)

Handset Mic/Speaker test (TAB 4)
Using RadioComm issue the following commands

1.	SUSPEND
2.	AUD_PATH – Select internal mic and internal speaker. Click Set
3.	AUD_LPB - Select Enhanced Full Rate and click Vocoder

Verify audio loopback					Pass / Fail	(circle one)

Mono Headset Mic/Speaker test (TAB 4)
Insert stereo headset accessory in headphone jack.

Using RadioComm issue the following commands

1.	SUSPEND
2.	AUD_PATH – Select boom mic and boom spkr right. Click Set
3.	AUD_LPB - Select Enhanced Full Rate and click Vocoder

Verify audio loopback					Pass / Fail	(circle one)

Stereo Headset Mic/Speaker test (TAB 4)
Insert stereo headset accessory in headphone jack.

Using RadioComm issue the following commands

1.	SUSPEND
2.	AUD_PATH – Select boom mic and boom spkr stereo. Click Set
3.	AUD_LPB - Select Enhanced Full Rate and click Vocoder

Verify audio loopback					Pass / Fail	(circle one)

Display Backlight test (TAB 4)
Using RadioComm issue the following commands

1.	SUSPEND
2.	TST_DISP - Click FL Off
3.	TST_DISP - Click FL On-Full

Verify operation					Pass / Fail	(circle one)

Display Color test (TAB 4)
Using RadioComm issue the following commands

1.	SUSPEND
2.	TST_DISP(Predefined) - Select Eight Color Box and click Set

Verify edges (uniform/smooth)			Pass / Fail	(circle one)

Display Linearity test (TAB 4)
Using RadioComm issue the following commands

1.	SUSPEND
2.	TST_DISP(Predefined) - Select Grey Scale Block and click Set

Verify smooth transition from dark to light		Pass / Fail	(circle one)

Display Flicker test (TAB 4)
Using RadioComm issue the following commands

1.	SUSPEND
2.	TST_DISP(Predefined) - Select Horizontal Zebra and click Set

Verify that no noticable flicker exists			Pass / Fail	(circle one)

Display Pixel Defect test (TAB 4)
Using RadioComm issue the following commands
1.	SUSPEND
2.	TST_DISP(Predefined) - Select All pixels on (all white) and click Set
3.	TST_DISP(Predefined) - Select All pixels off (all black) and click Set

Verify that less than 3 pixel defects			Pass / Fail	(circle one)

Keypad Backlight test (TAB 4)
Using RadioComm issue the following commands

1.	SUSPEND
2.	LEDS - Select Keypad to enable. Deselect Keypad to disable.

Verify operation					Pass / Fail	(circle one)

Bluetooth TX test (TAB 5)
Using RadioComm issue the following commands

1.	SUSPEND
2.	BLUETOOTH - select parameter 84 and click execute
3.	BLUETOOTH -  select 81 and click execute.
4.	BLUETOOTH - select parameter 01 and enter 2DFC0129 in the “TO Radio” field. Click Execute.

Using a spectrum analyzer verify that a 2441MHz signal is present. Use a RF probe to sniff the strongest signal around the “7” key of the keypad.

Bluetooth TX power		_____________dBm

GPS RF Connector test (Common Features/GPS)
Using RadioComm issue the following commands

1.	SUSPEND_COMP - select 01-GPS Chipset and UnSuspend. Click Execute
2.	TEST MODE - click Enter

Measure the DC voltage on the center of the GPS RF connector. 

GPS DC voltage 		_______________Vdc

Lab 5 (GSM Troubleshooting)
RX Troubleshooting
Setup

Broadcast Channel (BCH): 		  194
Broadcast Channel (BCH) Level:	-30Bm

Use RadioComm to send the following commands.

1.	SUSPEND
2.	CP_MODE - Click on 850/1900
3.	SCMP - Enter Channel 194 and click INIT

Measurements

Measure RX carrier at C677.		_______________dBm, 882.4MHz (see point A)
Measure RX_VCO_OUT at C507.	_______________dBm, 705.92MHz (see point B)
Measure RX_I at C604.		_______________, _________Vpp (see point C)
					(draw waveform)			
Measure RX_VTUNE at R503	_______________Vpp (see point D)
Measure RX baseband data at TP_BDR	_______________, ______Vpp (see point E)
						(draw waveform)

TX Troubleshooting
Setup

TX Channel: 661
TX Power Level: 0

Use RadioComm to send the following commands.
1.	SUSPEND
2.	CP_MODE - Click on 1900 (PCS)
3.	LOAD_SYN - Enter 661 (PCS) and then click Set
4.	SET_RF_PWR - Enter 0 (DCS/PCS) and then click Set
5.	CARRIER - Select 06 and then click ON

Measurements

Measure TX Mod at R576.		_______________, ______Vpp (see point F)
					(draw waveform)
Measure TX_HI_RF at L583		_____________dBm, 1880MHz (see point G)
Measure CPTX at R574.		_______________, ______Vpp (see point H)
					(draw waveform)
Measure DET_AOC at R814		_______________, ______Vpp (see point I)
					(draw waveform)
Measure DPCS_OUT at C801	___________dBm (see point J)

RX Audio Troubleshooting
Setup

Generate 1kHz tone using RadioComm
1.	SUSPEND
2.	AUD_PATH – Select internal speaker and internal mic. Click Set
3.	AUD_TN_GEN – select 1 Freq, enter 1000 in Freq 1 field, click Start Tones

Measurements

Measure EAR_SPKR- at C4003	___________kHz, _________Vpp (see point K)

TX Audio Troubleshooting
Setup
Insert mono headset accessory in headphone jack.

Generate 1kHz tone using RadioComm
1.	SUSPEND
2.	AUD_PATH – Select boom spkr right and boom mic. Click Set

Measurements

Measure HS_MIC_BIAS at C4395	_____________Vdc (see point L)

Baseband Troubleshooting
Measure BB_CLK_13M at R536	_______________, ______Vpp (see point M)
					(draw waveform)
Measure CLK_32.768K at TP3001	_______________, ______Vpp (see point N)
					(draw waveform)

Lab 6 (UMTS Troubleshooting)
RX Troubleshooting
Setup
Setup test instrument with following parameters,

Downlink Channel: 			 9800
Downlink Channel Level:		-30 dBm

Use RadioComm to send the following commands.
1.	SUSPEND
2.	CP_MODE - Click on W1900
3.	WSCMP - Enter Freq ID 9800 and click Start

Measurements

Measure RX carrier at C303.		_______________dBm, 1960MHz (see point O)
Measure LNA_OUT at R390		_______________dBm, 1960MHz (see point P)
Measure RX_PRE_1 at C156.	_______________dBm, 1306.67MHz (see point Q)
Measure WBRX_Q at R333.		______________, ________Vpp (see point R)
					(draw waveform)
Measure RX_CP at R305		_______________Vdc (see point S)

TX Troubleshooting
Setup

Use RadioComm to send the following commands.
1.	SUSPEND
2.	CP_MODE - Click on W1900
3.	For W_CARRIER assign these actions to each field

Freq ID (Dec)			9400
Action				Enable
Channelization		Enable
Data Pattern			PN 9
Scrambling			Long
DPCCH			SF256, SF0
DPDCH			SF256, SF0
Channelization Code		00
Transmit Power		FB
Max Power			15		
Min Power			80
Scram Code			00

Measurements

Measure BB_Q_M at E200.		______________, _______Vpp (see point 1)
					(draw waveform)
Measure TCXO_REF at C214	_____________, ________Vpp (see point 2)
					(draw waveform)
Measure PA RF_IN at C413.		____________dBm, 1880Mhz (see point 3)
Measure VGC at R200		____________Vdc (see point 4)
Measure PA RF_OUT at C425	___________dBm, 1880MHz (see point 5)

Baseband Troubleshooting
Setup

None

Measurements

Measure PCAP_RESET at TP3000	__________Vdc (see point U)
Measure WATCHDOG at R3205	__________Vdc (see point V)