HP 8562E Service Manual 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.
-250,000 ns -250,000 ns s s
50.0 ns/div 50.0 ns/div
Figure 12-6. 10 MHz Reference at A15J302
200
set: 0
000 :
250.000 ns 250.000 ns
f - 4 0 . 0 0
RF Section 12-21
000 v
'1 dc