Instruction manual

Chapter 6 Backdating
Backdating Hardware
Assembly-Level Service Guide 6-7
6
CHANGE 7 (Below Serial Number 3349A01906)
Page 5-7, Table 5-3. Replaceable Parts, under A1 (for the Agilent 53131A):
1
Add 53131-00004; 9; 1; SHIELD UPPER; 28480; 53131-00004
1
Add 53131-00005; 0; 1; SHIELD LOWER; 28480; 53131-00005
1
Add 53131-00008; 3; 1; SHIELD CHASSIS; 28480; 53131-00008
1
Add 53131-00009; 4: 1; GROUND CONNECTION 28480; 53131-00009
Change A4 (Standard) Agilent Part Number from 0950-2496 to 0950-2139.
Note: A4 AC Power Supply Assembly 0950-2496 allows 400 Hz operation from
100-120V.
1
These shields were needed to reduce susceptibility to EMI. However, the shields are
not needed on A1 Motherboard Assembly if the metalized front bezel is used in the
Counter. Thus, when you order a new A1 Motherboard Assembly (53131-60001,
same part number as the old A1) for your Agilent 53131A Counter, you need to
order a new metalized front bezel (53131-40003, same part number of the old non-
metalized front bezel).
CHANGE 8 (Below Serial Prefix 3404A)
Page 5-7, Table 5-3. Replaceable Parts:
Change, under OPTION 001, A6 Agilent Part Number from 53132-60008 to
53132-60004.
Change, under OPTION 001, 1812-0931; OSCILLATOR-OVEN; to 1812-0932;
OSCILLATOR-OVEN.
Change, under OPTION 010, A6 Agilent Part Number from 53132-60008 to
53132-60005.
Change, under OPTION 010, 10811-60111; OSCILLATOR-OVEN; to BLILEY
OSCILLATOR-OVEN.