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E8257D/67D, E8663D PSG Signal Generators Service Guide 93

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