Maintenance
TDS3000C Series S ervice Manual
4-37
¯ Reconnect loose cables.
¯ Return to top of Figure 4 --20.
No
Yes
Are there
+15 volts between pins
1 and 6?
¯ Measure for +15 V DC (± 0.5 V)
between line 1 (+) and line 6 (--) of
the disconnected cable
.
(see figure at right)
!WARNING!
Be careful when measuring near the
AC power supply, as there are line
voltages present on exposed parts.
AC power supply OK. Return the
TDS3000C oscilloscope to the
nearest Tektronix Service Center
for repair.
Continued from Figure 4--20.
¯ Disconnect J180 cable from
battery board.
¯ Connect AC power cord.
¯ Power off oscilloscope.
¯ Disconnect AC power cord.
¯ Remove instrument case.
¯ Check that all cables are
connected and fully seated into
board connectors.
No
Yes
Are all cables
connected?
Replace the AC
Power Supply module.
Pin 6
Pin 1
Pin 1 J180
Battery board
Figure 4- 21: AC power supply troubleshooting pr ocedure