HP 3300A Technical Manual page 52

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
630-01950 and below
702-02675 and below
809-03350 and below
809-03475 and below
CHANGE #1 Replace R16 and R17 with pieces of wire.
CHANGE #2 Replace A12R27 with a piece of wire.
Change A12R25 to 2 kÒ ± 10% 1/2 W.
Replace A12R28 with a piece of wire.
Change A12R26 to 5 kÒ ± 10% 1/2 W.
CHANGE #3 Replace A15R28 and A16R28 with pieces of wire.
CHANGE #4 Replace A13R25 with a piece of wire.
CHANGE #5 For instruments with serial number 939-04925 and below, change the following part numbers:
J1 should be 1251-0148.
W1 should be 8120-0078.
Rear Panel should be 03300-00202.
These parts are not directly interchangeable with the ones listed in Table 7-1. If any one is changed, all should be
changed.
CHANGE #6 (RECOMMENDED INSTRUMENT CHANGE)
Solder a short jumper wire between the shield ground ( © in this manual and ∇ in older manuals) and power line
ground · . This connection should be made on the terminal strip on the inside of the rear panel. This connection
will prevent the instrument shafts and set screws in the control knobs from being above power line ground.
Instruments with serial number 939-04950 and below did not have this change (see note 1).
Some instruments between serial number 939-04851 and 939-04950 already have this change. Check your
instrument to see if it has this change.
MANUAL BACKDATING CHANGES
Make Manual Changes
1 thru 6
2 thru 6
3 thru 6
4 thru 6
Instrument Serial Prefix
939-04925 and below
939-04950 and below
NOTE 1
Model 3300A
Make Manual Changes
5, 6
6