HP 3400A Operating And Service Manual page 71

APPENDIX A
BACKDATING
A-1. INTRODUCTION
A-2. The following backdating information adapts this manual to instruments with a serial
number prefix other than shown on the title page, but not below 2225 (see paragraph A-4).
' In addition, instruments where a serial number prefix change did not occur, are also listed
in this appendix.
A-3. If the component values in the instrument are different than the ones shown on the
schematics and parts list (Table 7-3) and are NOT listed in this appendix, replace with the
component values and part numbers presently on the schematics and parts list.
A-4. The instrument serial number can be found on the rear panel of the instrument and
is in the form of XXXXAXXXXX. The first four numbers is the serial number prefix and
the last five numbers is the suffix. Refer to the following backdating information only if
the prefix of your instrument is different than shown on the title page, and is 2225 and above.
Instruments with a prefix below 2225 are older 3400A's to which this manual and the following
information do not apply. For those older instruments, refer to a 3400A manual with -hp-
Part Number 03400-90008.
A-5. MANUAL CHANGES
A-6. Refer to Table A-1 to adapt this manual to instruments with serial number prefixes
or serial numbers below the ones shown on the title page. Make all the appropriate manual
changes listed opposite your serial number or serial number prefix. Perform these in the se-
quence shown in the table.
A-7. If your instrument serial number or prefix is not listed on this manual's title page or
in Table A-1, and the prefix 1s 2225 or above, it may be documented in a yellow MANUAL
CHANGES supplement.
Table A-1. Manual Changes
Seria) Prefixi/Number Make Manual Changes
CHANGE #1
This change applies to instruments with A6 nants that have a Revision A designation.
Section V, Paragraph 5-22. Delete paragraph 5-22 steps a thru e.
Section VI, Figure 6-3 Changes. Use component locator in Figure A-1 and the schematic in
Figure A-2. The shaded area on the schematic pertains to the changes.