Tektronix RTX100B, Service Manual

Page: 141 / 178

Troubleshooting
RTX100B ISDB-T RF Signal Generator Service Manual
5-39
(A)
No
Is +5 VSB line at pin 9
of J170* on the A20 PCI
Backplane board correct
(4.9 V to 5.30 V)?
Yes
H
Check the 174-5172-00 cable.
H
Check the 5 V main power supply
module on the A40 AC Distributor
board.
Replace the CPU board.
Yes
Yes
Yes
No
H
Check the 174-5185-00,174-5220-00,
and 174-5173-00 cables.
H
Check the On/Standby switch on the
Ketpad board.
No H
Check the 174-5174-00 cable.
H
Replace the CPU board.
No
Remove the A12 Main board or the
A150 ISDB-T RF Output board from the
A20 PCI Backplane board.
3
Is pressed, is the voltage at
pin 10 of J240* about 5 V?
Is PWON# line at pin 10
of J170 on the A20 PCI
Backplane board about
0 V ?
Are all the voltages of
+5 V, +3.3 V, +12 V, and
--12 V correct ?
* See Figure 5-23 on page 5-43.
* See Figure 5-24 on page 5-44.
Figure 5-18: Troubleshooting procedure (4)