Agilent Technologies 856290216 - page 447

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