Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-59
1600 Host <-> BBB Comm
• If the +3.4 VD, +2.6 VD, and +1.9 VD supply voltages are good on the connector pins indicated:
a. Turn power off to the signal generator.
b. Remove the A7 Baseband Generator (Option 001 or Option 002) and ohm the connection between the
appropriate pins of J1, on the A23 Motherboard side, and socket J1, on the A7 Baseband Generator
(Option 001 or Option 002) side.
— If the connection is good, replace the A7 Baseband Generator (Option 001 or Option 002).
(Refer to “A7 Baseband Generator (Option 001 or Option 002)” on page 2-22.)
— If the connection is bad, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
• If the +3.4 VD supply voltage is bad on the connector pins indicated:
a. Check the origin of the supply.
— If the supply voltage is good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the supply voltage is bad at the origin, troubleshoot the problem using that assembly's
troubleshooting procedure.
• If the +2.6 VD and +1.9 VD supply voltages are bad on the connector pins indicated:
a. Replace the A23 Motherboard.
1601 Apps1 <-> Apps2 Comm
• If the +1.8 VD supply voltages is good on the connector pins indicated:
a. Turn power off to the signal generator.
b. Remove the A7 Baseband Generator (Option 001 or Option 002) and ohm the connection between the
appropriate pins of J1, on the A23 Motherboard side, and socket J1, on the A7 Baseband Generator
(Option 001 or Option 002) side.
— If the connection is good, replace the A7 Baseband Generator (Option 001 or Option 002).
(Refer to “A7 Baseband Generator (Option 001 or Option 002)” on page 2-22.)
— If the connection is bad, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
• If the supply voltages are bad on the connector pins indicated:
a. Check the origin of the supply.
— If the supply voltage is good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the supply voltage is bad at the origin, troubleshoot the problem using that assembly's
troubleshooting procedure.
1602 Apps1 <-> SH4 Comm
• Replace the A7 Baseband Generator (Option 001 or Option 002).