Overall Troubleshooting; A20 N Checker Troubleshooting - HP 5340A Operating And Service Manual

5-24. OVERALL TROUBLESHOOTING

5-25. Proceed with these tests in the order listed.
Set 5340A controls as follows:
a.
RESOLUTION to 1K
SAMPLE RATE to max ccw
RANGE to CHK
OSC
(rear panel) to INT
LINE (front panel) to ON
Check that the GATE lamp flashes. The display should be 10.000 MHz *1 count.
Check that DIRect lamp flashes. Move the RESOLUTION switch through all of its positions
and observe the display.
If the 5340A fails any of these tests, go to Troubleshooting Chart #1 of Figure 5-5.
Connect a 220 MHz signal at 0 dBm (644 mV p-p) to the 1 MR input using a 50R feedthru
b.
termination. Move RANGE switch to "10 Hz to 250 MHz" and RESOLUTION to 1
The GATE lamp should flash, the DIRect lamp should be lit and the counter should dis-
play the correct frequency for all positions of the RESOLUTION switch.
If the 5340A fails any of the above, go to Troubleshooting Chart #2 of Figure 5-5.
Connect the signal to the 50R INPUT, move RANGE switch to
c.
RESOLUTION switch to 1 kHz. The GATE lamp should flash, the DIRect lamp should
be lit and the counter should display the correct frequency for all positions of the
RESOLUTION switch.
Change input frequency to 280 MHz 0 dBm. Move the RANGE switch to the "250 MHz
d.
to 18 GHz" position. The LOCK lamp should now light, the GATE lamp should continue
to flash and the counter should display the correct frequency (280 MHz) for all positions
of the RESOLUTION switch.
If this test is failed, go to Troubleshooting Chart #4 (Figure 5-5).
For each position of the RESOLUTION switch, move the RANGE switch between "250
e.
count.
1
If this test fails,, +termi,ne which frequency is incorrect and use Troubleshooting
Chart #3 or #4 (Fi ure 5-5).
4
Checker Troubleshooting
5-26. A20 N
Remove A5 05340-60003 from 5340A and place A20 on a n extender. Short A21(22)
5-27.
to chassis. Unsolder the wire connected to XAZO(W).
Resolution Display *1 Count
1
10.00000 MHz
10
100 10.0000 MHz
K
10
K
100
18
Maintenance and Service
10.000 MHz
10.00 MHz
10.0 MHz
Model 5340A
K.
to 18
5-17