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b. Check
U305
pin 3 for approximately
+12
Vdc (Option 103 only).
c. Check for a 10 MHz sine wave greater than or equal to 1 V p-p at J305 (standard
HP
85623),
or at
U302
pin 3 with an oscilloscope (Option 103).
10. If the signal at
U304
pin 13 is correct (see Figure 12-7), but there is a problem with the
signals at A15J301, A155302, A155303, or A15J304, suspect
U303
or
U304
in the 10 MHz
Distribution circuitry.
hp running
-250,000 ns-250,000 ns
o,ooooo
s
o,ooooo
s
50.0
ns/div
50.0
ns/div
250.000 ns250.000 ns
200
set: 0
000
:
mV/div
000 v
'1 dc
1
f-40.00
mV
Figure 12-6. 10 MHz Reference at
A15J302
RF Section 12-21