HP 9153 A Service Manual page 26

FUNCTIONAL DESCRIPTION
CHAPTER
Paragraph No. Product Version
1 through 2
HP 9153/54A, S/N Prefix 2515A and lower
3
HP 9153/54A, S/N Prefix 2702A and higher HP 9153/54B, All
Serial Numbers
[1] GENERAL OVERVIEW
[2] THEORY OF OPERATION
(HP 9153/54A units with S/N Prefix 2515A and Below)