HP 8112A Operating, Programming And Servicing Manual page 235
50 mhz programmable pulse generator
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- Operating, programming and servicing manual (112 pages) ,
- Operating, programming and servicing manual (406 pages)
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Troubleshooting
Note
Shaper IC Inputs
a key, ( LCL) for example, to return the microprocessor to normal
•
If an error code is being displayed by the HP 8 1 12A you must press
operation before troubleshooting.
•
The component layout and locator for the main board Al is at the
end of this chapter.
1 . Set up the HP 8 1 1 2A as follows:
RCL
Output
2. Press the (SET ) key
3. Use an oscilloscope to check the signals at pins 19 and 18 of U401
against Figure 10.4-6. Note that the signals on pins 18 and 19 are
not necessarily symmetrical.
+0 . 2 6 V
P I N
+0 . 1 4 V
+0 . 2 6 V
P I N
+0 . 1 4 V
Figure 1 0.4-6. Shaper IC Input Signals on Pins 1 8/19
- 0
- 0 . 4 V
Figure 1 0.4-7. Shaper IC Output on Pin 1 2
4. Change the H P 8 1 1 2A transition mode t o FIXED .
5. Check the output on U401 pin 6 against Figure 10.4-8
Servicing the Shaper and Output Amplifier 1 0.4-1 1
0
Enabled
I
I
I
I
1 g
I
I
I
I
I
I
I
s
1 00u
----.i
I
I
I
I
I
I
I
I
I
1 8
I
l ms ---- --�
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