HP 3400A Operating And Service Manual page 29

Section V
CHECK
Measure the
13
to Figure 5 - 1 1 for waveform.
5-12
Figure 5-10. Collector of Q602 (feedback loop open)
Table 5-6. Troubleshooting Procedure (Cont'd)
PROCEDURE
signal at base of Q604.
ac
of
Figure 5-11. Base Q604 (feedback loop open)
COLLECTOR OF Q602
Insert
499 kO resistor to pin 1 3 on A6
Sweep
Vertical
DC coupled
use 10:1 probe
Refer PASSES:
FAILS:
BASE OF Q604
Insert
+
499kO reSistor to pin 1 3 0nAB
Sweep
Vertical
AC coupled
no probe required
Model 3400A
10 rn V signal through
+
5 rns/em
=
0. 5 V/em
=
ACTION
Proceed to
to
Proceed
10 m V signal through
5 ms/em
=
5 V/cm
=
0 1 768-4