Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-60
1603 Apps2 <-> SH4 Comm
• Replace the A7 Baseband Generator (Option 001 or Option 002).
1604 Fliegen <-> Apps2 Comm
• Replace the A7 Baseband Generator (Option 001 or Option 002).
1605 SRAM Test
• Replace the A7 Baseband Generator (Option 001 or Option 002).
1606 SDRAM Test
• Replace the A7 Baseband Generator (Option 001 or Option 002).
1607 Paren <-> SH4 Comm
• Replace the A7 Baseband Generator (Option 001 or Option 002).
1608 VCO Tune Test
• If the +32 V, ±15 V, and ±5.2 V 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 J11/J1, on the A23 Motherboard side, and socket J11/J1, on the A7 Baseband
Generator (Option 001 or Option 002) side.
— If the connection is good:
a. Re-insert the A7 Baseband Generator (Option 001 or Option 002).
b. Turn power on to the signal generator.
c. Check the 10 MHz signal on the A23 Motherboard at J1 pins 26 and 91 using an oscilloscope.
The signal should be 100 ns with an amplitude of approximately 1.0 Vp-p or higher.
— If the 10 MHz signal 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 10 MHz signal is bad, troubleshoot the A23 Motherboard and the A7 Baseband
Generator (Option 001 or Option 002).
— If the connection is bad, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
• If the +32 V, ±15 V, and ±5.2 V 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.