Assembly-Level Service
Service
2-4
Figure 2-1. Instrument Top View
The “Batteries (Hidden behind battery door)”callout is changed to:
48 Vdc Input Terminals and Fuse
Top-Level Diagnostic Tree Organization
Warning Message Diagnostic Tree (Diagnostic Subsection 4)
On page 2-15, item number “1.4.4 Power Source is Batt” is deleted and
item “1.4.4.1” is changed to 1.4.4.
Top-Level Diagnostic Tree (Diagnostic Section 1)
1.0.0 First Power On
Step 3 text is changed:
Ensure that the rear-panel dc-line fuse holder has a good fuse of the
correct rating.
Step 6 text is changed:
Power on the 5071A by applying dc or ac power.
The If No response to the QUESTION: is changed:
Disconnect power immediately and check the appropriate rear-panel
power fuse.
If fuse is intact, Go to, 1.0.1.1.0.
If fuse is blown, Go to, 2. 1. 1. 1. 0 (Power Supply Diagnostic Tree.)
Step 1. 0. 1. 1. 0 is added below :
1.0.1.1.0 D C Input 1 and 2 Pow er Steering Circuit Check
Use the DC Input 1 and 2 Power Steering Circuit Schematic (Figure
2-1.) located on page 17 of this chapter to troubleshoot the dc power
input steering function.
QUESTION: Is the DC input power steering circuit functional?
(48V Subpanel Assembly, Option 048)
If Yes: Go to, 1. 0. 1. 1.
If No: Replace the 48V Subpanel Assembly,
(part number 05071-60277) and retest .
Option 048:
Option 048:
Option 048: