Model
83522A
Service
Prior to performing the test procedure, preset the
A3S1 Configuration switch
sections 5 and 6 to the closed (0) position. Several of the troubleshooting
waveforms require different switch settings. A description of each switch setting
follows.
For
-6
MHzN
Sensitivity
-
set A3S1 section 5 to the open (1) position.
For
-20
MHzAl
Sensitivity
-
set A3S1 section 5 to the closed (0)
position.
For
DC Coupled mode
-
set A3S1 section 6 to the open (1) position.
For
Cross-Over Coupled mode
-
set A3S1 section 6 to the closed (0)
position.
NOTE
The
8350A
front panel
thlSTR
PRESET
pushbutton must be
pressed after each switch position change in order for the
selection mode to take effect.
1.
Adjust the function generator frequency and amplitude controls to obtain
one of the waveforms in the first column
(TP11) of Figure 8-42.
2.
Verify the remaining waveforms in the corresponding row.
FM
Configuration Control Circuits Troubleshooting
The FM configuration control circuits include the Address Decoder, Control
Latches, relays
K1 and
K2,
and analog switches U3D and U11. Incorrect or no
operation in a specific configuration mode is the most likely result of a failure in
these
circuits.The troubleshooting procedure for these circuits uses several of the
8350A Sweep Oscillator operator initiated self tests. Separate tests for each
section of the configuration control circuits are provided in the following
paragraphs.
Address Decoder.
Check proper Address Decoder operation by performing a
Minor Address Decoder Self Test.
On the
83504 enter:
SHIFT
5
Minor Address Decoder Test
Check the Address Decoder outputs LEN
4
and LEN 5 as shown in Figure 8-37.
Control Latches.
Control latch U16 is checked by performing a hexadecimal
data rotation write to U16, and then checking the outputs for the waveforms
shown in Figure 8-2. The oscilloscope should be triggered from U16 pin 15.
Exercise U16 with Hex Data Rotation Write. Enter:
SHIFT
0
0
2
GHzs
0
4
M4
Enters Hex Data command
Address location
2C04
(U16)
Hex Data Rotation Write
Check the outputs of U16 against waveforms shown in Figure 8-2.
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