Troubleshooting
TDS5000B Series Service Manual
6-- 53
If the instrument will not power on, you can isolate the problem by observing the
specific symptoms and comparing them to those listed below.
If the mains power cord is connected and the oscilloscope is not on, (power
supply is in standby mode), +5 V will be present on pin 9 of P1, the power
supply connector. If +5 V is not present, replace the power supply.
If the PSON signal on J1100, pin 2 is low, the oscilloscope interprets this signal
as an indication that the power is on. If the PSON signal is high, measure the
resistance from J510, pin 50 to ground, and J520, pin 6 to ground, while
depressing the ON/STBY button on the front panel. If the resistance measures
less than 500 ohms in either test, replace the PC motherboard.
If the oscilloscope powers on momentarily, an over current condition exists.
Remove boards one at a time to locate a fault (the display, disk drive adapter
board, acquisition board, and the PC motherboard). If you remove the PC
motherboard, you must jumper the forced power-on pins (see Figure 6--27). The
PC Interface board is required for power to come up.
If removing the boards did not find the problem, replace the power supply.
Reset button
TP1102
TP1103
JP1100 Forced
Power on
CR520
Hard disk
activity LED
CR710
PAI load
error LED
CR700
PAI loading
LED
Figure 6--27: Location of jumpers and reset button
Isolating to a Board if
Power Will Not Come Up
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