Collector Of Q602; Base Of Q604 - HP 3400A Operating And Service Manual

Section
V Model 3400A
%
i
COLLECTOR OF
Q602
Insert + 10
mV
signal
through
499
kn
resistortopinl3onA6
Sweep =
5
ms/cm
Vertical
=
0.5
V/cm
DC
coupled
use
10:1
probe
Figure 5-10. Collector
of
Q602 (feedback loop open)
Table 5-6.
Troubleshooting Procedure
(Cont'd)
CHECK
PROCEDURE
ACTION
13
Measure
the ac signal at
base
of
Q604.
Refer
to
Figure 5-11
for
waveform.
PASSES: Proceed
to
@
FAILS: Proceed
to
©
V
^*
L
nn
JU
BASE OF
Q604
Insert +
10
mV
signal
through
499
kft
resistor
to pin 13
on
A6
Sweep =
5
ms/cm
Vertical =
5V/cm
AC
coupled
no probe required
:
Figure 5-11.
Base
of
Q604 (feedback loop open)
'
5-12
01768-4