HP TM 11-6625-2779-14&P - Manual (Page 79)

Model 3555B APPENDIX C Appendix C
MANUAL BACKDATING CHANGES
Model 3555B
TRANSMISSION AND NOISE MEASURING SET
This manual backdating sheet makes this manual applicable to earlier instruments.
Instrument-component values that differ from those in the manual, yet are not listed in
the backdating sheet, should be replaced using the part number given in the manual.
Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes
916-00500 and below 1 thru 7 0992A03537 and below 7
916-00509 and below 2 thru 7
953-00544 and below 3 thru 7
953-00825 and below 4 thru 7
0992A01395 and below 5 thru 7
0992A03536 and below 6, 7
Change No. 1
In instruments with S/N 916-00500 and below CR1 and C2 in the power supply were located as shown in the
following figure:
Change No. 2
Table 6-1 and figure 7-3, change:
A2C8 to 33pF, part no. 0160-2150
A2C9 to 320pF, part no. 0140-0226
A2C10 to 39pF, part no. 01400175
A2C11 to 51 pF, part no. 0160-2201
Change No. 3
Figure 7-4, change the pin connections as follows: 7 to 6, 13 to 12, 16 to 15, 15 to 13. Instruments with serial
numbers 953)00544 and below had a 03555-66506 Revision A board in them. This board is not interchangeable
with the Revision B board. The above pin connections are for the Revision A board.
Change No. 4
Delete S6 in figure 7-5 and in Table 6-1. Earlier instruments did not have this switch. See the following figure
for earlier instruments.
C-1