Specifications

1-60

Troubleshooting

Troubleshooting Assembly–Level Problems

1600 Host <–> BBG Comm

• If the +3.4 VD, +2.6 VD, and +1.9 VD supply voltages are good on the A31 Motherboard, replace

the A14 Baseband Generator.

• If the +3.4 VD or +2.6 VD supply voltages are bad on the A31 Motherboard, check the origin of

the supply.

— If the supply voltage is good at the origin, replace the A31 Motherboard.

— If the supply voltage is bad at the origin, troubleshoot the A19 Power Supply.

• If the +1.9 VD supply voltage is bad on the A31 Motherboard, check the +3.4 VD supply at the

A19 Power Supply.

— If the +3.4 VD supply is good at the A19 Power Supply, replace the A31 Motherboard.

— If the +3.4 VD supply is bad at the A19 Power Supply, troubleshoot A19 Power supply.

1601 Apps 1 <–> Apps 2 Comm

• If the +1.8 VD supply voltage is good on the A31 Motherboard, replace the A14 Baseband

Generator

• If the +1.8 VD supply voltage is bad on the A31 Motherboard, check the +2.6 VD supply at the

A19 Power Supply.

— If the +2.6 VD supply is good at the A19 Power Supply, then replace the A31 Motherboard.

— If the +2.6 VD supply is bad at the A19 Power Supply, then troubleshoot the A19 Power

supply.

1602 Apps 1 <–> SH4 Comm