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Instrument Changes Model
8904A
Cable
Tie
Wire
(Green/Yellow)
7-7.
MODIFICATION
FOR
POSSIBLE
GROUND
WIRE
SHOCK HAZARD
0360-0036
1400-0249
81
50-291
9
(Serial Prefix
2737A
and
below)
On some instruments with serial prefix
2737A
and below,
the
grounding
wire from
the
rear-panel line socket to
the
metal chassis may not have
been wrapped and soldered in compliance with strict safety standards.
This
condition does not create a safety hazard under normal use; however, a safety
hazard can develop
if
the following
two
conditions occur.
(1)
If
the
ground wire ever sustains heavy current long enough,
the
solder on
the connections can erode, weaken, and eventually cause the connections to
loosen. Should ground contact break,
the
chassis can no longer be guaranteed
to be at ground potential.
(2)
With ground contact interrupted, the chassis could become “hot” if
the
neutral or high lines of the power cord come in contact with the chassis
through some other fault. The chassis
then
becomes a shock hazard.
With
proper wrapping and soldering of
the
ground connections,
the
ground
wire will maintain a reasonable mechanical connection even though
the
solder
has
deteriorated.
This information explains how to check for the possible shock hazard and how to correct it. The check
for
the shock hazard is by simple visual inspection. Corrective action, if needed, consists
of
replacing
the ground wire with attention paid to wrapping and soldering it
to
its solder lugs. Replacement of
the wire should be made by someone with wire soldering skills.
The following parts may be required
1
Description
I
Quantity
1
HPPart Number
I
7-10
Firmware Updates/Hardware Modifications
rev.
15DEC89