Tektronix TDS 420A Service Manual

Troubleshooting
6-92
TDS 420A, TDS 430A & TDS 460A Service Manual
Yes
No
No
Yes
Securely install or
replace the front panel
cables.
Use this procedure to
determine if the A03 CPU or
the A06 Front Panel module is
bad.
Do all
of the front panel LEDs
turn on and then turn off a
short
time later?
Turn on the principle POWER
switch.
Press the ON/STBY
button.
Do the front panel
LEDs turn on at
all?
No
Yes
No
Yes
Are
the correct voltages
at J101 and J106
(see Figure 6--44
and Table 6--13?
Replace the
A06 Front Panel
module.
No
Yes
Does one
front panel LED
turn on and then turn off, followed by
the next LED until all LEDs have
turned
on and then
turned off?
The A06 Front Panel
board is ok.
Are all
front panel cables
securely installed in their
sockets and are the
cables ok?
Replace the
A03 CPU board.
No
Yes
Do
the front
panel LEDs turn on a
short time later and
then turn
off?
Figure 6- 43: Processor/Front Panel Troubleshooting Procedure

Tektronix TDS 420A Specifications

General

Brand	Tektronix
Model	TDS 420A
Category	Test Equipment
Language	English