PMCE Customer Service1 X500 RF Trouble Shooting - Lesson Four X500 Training Course RF Trouble Shooting

PMCE Customer Service2 X500 RF Trouble Shooting - Lesson Four RF & TX Part RF & Transmitter Field

PMCE Customer Service3 X500 RF Trouble Shooting - Lesson Four Receiver Flow Chart U501 F501&F502 U503 Rx

PMCE Customer Service4 X500 RF Trouble Shooting - Lesson Four Receiver Flow Chart Rx : Set RF Measure Instrument: HP8960 or HP Operating mode Test mode, Test function TW 2.900/1800 Bend: Ch MHz, Cell power -60dBm (Ch699: MHz) 3 850/1900 Band: Ch MHz, Cell power -60dBm (Ch661: 1.96GHz)

PMCE Customer Service5 X500 RF Trouble Shooting - Lesson Four GSM Receiver Placement

PMCE Customer Service6 X500 RF Trouble Shooting - Lesson Four Receiver Flow Chart Step 1. Check JP1 first, if we dont insert RF cable, pin 1 must short to pin 2 Step 2. Use probe, touch C540 pin 1 : ~ -61dBm GSM Freq = 947.4MHz DCS Freq = MHz S1 S2

PMCE Customer Service7 X500 RF Trouble Shooting - Lesson Four C540 pin 1, GSM Freq = 947.4MHz

PMCE Customer Service8 X500 RF Trouble Shooting - Lesson Four C540 pin 1, DCS Freq = MHz

PMCE Customer Service9 X500 RF Trouble Shooting - Lesson Four Receiver Flow Chart Step 3. Use probe to touch C702 : ~ -61dBm (GSM Freq = 947.4MHz) Use probe to touch C555 : ~ -61dBm (DCS Freq = MHz) S3 (DCS) S3 (EGSM)

PMCE Customer Service10 X500 RF Trouble Shooting - Lesson Four C702, GSM Freq = 947.4MHz

PMCE Customer Service11 X500 RF Trouble Shooting - Lesson Four C555, DCS Freq = MHz

PMCE Customer Service12 X500 RF Trouble Shooting - Lesson Four Receiver Flow Chart Step 4. Use probe to touch L510 : ~ -63dBm (GSM Freq = 947.4MHz) Use probe to touch L513 : ~ -62dBm (DCS Freq = MHz) S4 (DCS) S4 (EGSM)

PMCE Customer Service13 X500 RF Trouble Shooting - Lesson Four L510, GSM Freq = 947.4MHz

PMCE Customer Service14 X500 RF Trouble Shooting - Lesson Four L513, DCS Freq = MHz

PMCE Customer Service15 X500 RF Trouble Shooting - Lesson Four Receiver Flow Chart Step 5. Check RX I and Q signal, Use probe to touch U501, Pin 55 to 58. S5

PMCE Customer Service16 X500 RF Trouble Shooting - Lesson Four U501, Pin 55 to 58, RX I and Q signal

PMCE Customer Service17 X500 RF Trouble Shooting - Lesson Four Transmitter Flow Chart S2 S3, S4 U503 U501 U502

PMCE Customer Service18 X500 RF Trouble Shooting - Lesson Four Transmitter Flow Chart 1. Operating mode Test mode, Test function TW 2.900/1800 Bend: Ch MHz, Cell power -60dBm, MS_TX_level 5 Ch MHz, Cell power -60dBm, MS_TX_level /1900 Band: Ch MHz, Cell power -60dBm, MS_TX_level 5 Ch GHz, Cell power -60dBm, MS_TX_level 0 TX : Set Transmitter Measure Instrument: HP8960 or HP8922 TX

PMCE Customer Service19 X500 RF Trouble Shooting - Lesson Four GSM Transmitter Placement

PMCE Customer Service20 X500 RF Trouble Shooting - Lesson Four Transmitter Flow Chart Step 1. Check TX I and Q first. If TX I & Q, are not normal, this is mostly caused by G2, and in some minor cases by IOTA. S1

PMCE Customer Service21 X500 RF Trouble Shooting - Lesson Four TX I & Q signal

PMCE Customer Service22 X500 RF Trouble Shooting - Lesson Four Transmitter Flow Chart Step 2. Use Oscilloscope probe to touch R526 : ~ 1.5V (for GSM) Use Oscilloscope probe to touch R526 : ~ 1.7V (for DCS) S2

PMCE Customer Service23 X500 RF Trouble Shooting - Lesson Four R526 for GSM

PMCE Customer Service24 X500 RF Trouble Shooting - Lesson Four R526 for DCS

PMCE Customer Service25 X500 RF Trouble Shooting - Lesson Four Transmitter Flow Chart Step 3. Use probe to touch R538 : ~7 dBm, check PA_GSM_input (Freq = 902.4MHz) R540 : ~0 dBm, check PA_DCS_input (Freq = MHz) If S2 and S3 are both ok, mean Transceiver is ok.) S3 (EGSM) S3 (DCS)

PMCE Customer Service26 X500 RF Trouble Shooting - Lesson Four R538 for GSM

PMCE Customer Service27 X500 RF Trouble Shooting - Lesson Four R540 for DCS

PMCE Customer Service28 X500 RF Trouble Shooting - Lesson Four Transmitter Flow Chart Step 4. Press TX_APC(350), use Oscilloscope probe to touch R546 : ~ 0.8V, Then, press TX_APC(550), and touch R546 : ~ 1.3V S4 Note: APC controls PA output power. If PA has not enough power or no power, we must check S3 and S4. When APC is increased,the voltage of S4 will be increased as well. It means S4 is normal.

PMCE Customer Service29 X500 RF Trouble Shooting - Lesson Four R546 for TX_APC(350)

PMCE Customer Service30 X500 RF Trouble Shooting - Lesson Four R546 for TX_APC(550)

PMCE Customer Service31 X500 RF Trouble Shooting - Lesson Four DCS Receiver Placement

PMCE Customer Service32 X500 RF Trouble Shooting - Lesson Four DCS Transmitter Placement

PMCE Customer Service33 X500 RF Trouble Shooting - Lesson Four Any Questions?