HP 4262A User Manual

Model 4262A
ADJUSTMENT
Section V
Paragraph 5-21
2. This adjustment is not affected by any
other adjustment. If this adjustment fails to
bring any of the output voltages to their
specified values, refer to Section VIII
Service Sheet No. 9 for troubleshooting.
5-21. NANOPROCESSOR OPERATING POWER VOLTAGE ADJUSTMENT.
PURPOSE:
This adjustment adjusts the operating power voltage to the nanoprocessor integrated
circuit on A23 Nanoprocessor and ROM Assembly to its prescribed value.
To A23 TPS
To Chassis
-ogbgo &
N
Figure 5-2. Nanoprocessor Operating Power Voltage Adjustment Location.
. EQUIPMENT:
DC Voltmeter...... e HP 5300A/wb306A
PROCEDURE:
DC_VOLTMETER
lo
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&DDDD 0000 66
—
a. Connect DC voltmeter plus input to test point A23TP4 and minus input to
4262A chassis with dual banana plug to alligator clip cable. See Figure 5-2.
Note
CT20A
Operating Voltage
The prescribed operating power voltage to the
nanoprocessor IC (A23U1) is stamped on the
IC ceramic case as shown in illustration at left.
b.
Set
DC
Voltmeter
range
as
appropriate
for
measuring
the
prescribed
operating
voltage of A23U1 nanoprocessor.
c.
Adjust
VR1
potentiometer
A23R14
for
the
prescribed
voltage
to
within
.
+0.1Vdc.
d.
Remove
cables
and
DC
voltmeter
from
4262A.
5-7

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English