Backdating; Introduction - HP 3585A Service Manual

7· 1 . INTRODUCTION
This manual section contains information on instruments which are older than the in­
struments documented in other manual sections. These backdating changes are referenced
throughout the manual by a numbered delta (d#) . The number indicates the number of the
corresponding backdating change.
7 ·2 . .:l 1 -90MHz FILTER CIRCUIT
7·3. Applicable Serial Numbers
•
Information not available at this time.
7·4. Affected Manual Areas
•
Conversion Section Adjustments, Paragraph 5-43 tt/xx.
•
1 750A 00230 and below.
•
SO A2-Conversion Section, Schematic A-2.
•
Replaceable Parts, Table 6-3 .
7·5. Description of Change
Models with serial numbers listed above have no adjustments for the 2nd Mixer Board (A-4),
90MHz Filter Circuit . Schematic Drawing 7-1 and Replaceable Parts Table 7-1 show the cir­
cuit and part differences respectively. Schematics and parts tables are located at the end of
this manual section.
7 ·6 . .:l2-IF FILTER CIRCUITS
7·7. Applicable Serial Numbers
•
and below.
7·8. Affected Manual Areas
•
IF Filter Adjustments, Paragraphs 5-29/5-40.
•
1 6 dB Amplifier Adjustments, Paragraph 5-41 .
•
SO A3-Final IF Section, Schematics A-3a/b/c.
•
Replaceable Parts , Table 6-3 .
7 ·9. Description of Change
Models with serial numbers listed above use an A- l I , A-1 2, and A- 1 3 Board as the IF circuit
instead of the A-1 7 , A- 1 8, and A-1 9 Boards. The differences in these boards do not affect
the IF adjustment principles; however, some of the adjusting components have changed.
S ECTI O N VII
BACKDATI N G
Scans by ART EK MEDIA =>
7- 1