HP 5065A Operating And Service Manual page 126

Incorrect output
freq. (J3). Note:
Counter must use -
ext time base
from 5065A.
Check freq. vs
-thumbwheel
setting (Table 3-8)
| NO
Measure period at I
TP1 (Syn. A1TP1 1
output period
table)
■ See Table 5-9
Check CR28, Q17 and
„ L associated components.
YES
Remove Yl
L- Check signal -
at
©-0
r
NO
Check signal
YES
| Check signal at
Q19(C)
Go to "A", Table 5-9
YES
Replace Yl.
DisconnectJ2.
"Check signal at
©
r Check C29, CR32, CR33
NO
- I
YES
| _ Connect J2
Check signal
Go to " B " , Table 5 - 9
Connect 1.5V
power supply + to
junction R56 &
R&4, -to ground.
Observe signal
" at Q18(E). Change
power supply
volts slightly and
observe signal
level change.
Check Q18 and
-associated compo­
nents including R56.
No signal level change.
Incorrect output
level. J l or J3
(should be O.lVrms
or greater)
INCORRECT
_Check
"signal a t "
Signal level changes.
L
Check Q21 and
I associated circuitry.
INCORRECT
CORRECT
Check signal ■
at0
Check Q26 and
-associated circuitry.
Check tuning of T4.
CORRECT
_Recheck_
signal at
r
Check tuning of T3.
Check Q22 and associ­
ated circuitry.
INCORRECT
^ CORRECT
Check CR34, CR35
_ and associated AGC
bias circuitry. Check
tuning of T3.