Line Module Troubleshooting; Rectifiers And Regulators - HP 8340B Manual
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LINE MODULE TROUBLESHOOTING
Refer to Figure
1-6 in
REPAIR PROCEDURES.
1.
Ensure that the main
line
fuse and the selected
line
voltage are correct.
2.
Disconnect
line
power,
and
remove
the instrument top and bottom covers.
3.
Wait for the
A19
power-on safety
indicator to go
out.
4.
Remove the portion of the rear panel that
holds the line module:
a.
Remove two screws
(item 12).
b.
Invert the instrument
and remove three rear
panel
screws
(item 7).
c.
Remove the
ASS
assembly protective cover.
d.
Remove
three rear panel screws (item
13).
e.
Remove
the fan.
f.
Remove three
rear panel screws (item
8).
g.
From inside the instrument, push the rear panel out.
5.
Reconnect
line
power.
6.
If
the line voltage selector cam
is
set to 120 or
240
Vac, measure the voltage across output
pins C
and
E,
and across
pins
D
and
F.
If
the
line
voltage selector cam
is
set to 100 or
220
Vac,
measure the voltage across output
pins
A
and
F
(see LINE MODULE REPLACEMENT).
7.
The
voltage across these
pins
should equal the selected
line voltage.
If
no
voltage
is
present,
replace the
line
module.
RECTIFIERS AND REGULATORS
+22V
is
the only completely independent power
supply, and no other
power
supply directly depends
on
it.
When 4-22V comes
on,
LSBY (low
standby)
goes low, triggering the
+20V
supply.
The
+20V
supply does not directly require another supply to operate,
but
all
other
supplies (except
+22V)
are directly or
indirectly
dependent on
it.
There are other power
supply interrelationships as
well:
•
The +12V
supply requires both the
+5.2
and
—5.2V
supplies.
•
The
—5.2V
supply
is
powered
by the —10V supply.
•
The —15V supply
is
powered
by the
—40V
supply.
To determine
the faulty rectifier or regulator when
multiple
supplies are down,
or
to determine
if
a
single supply failure
is
caused by the rectifier or
regulator,
refer to Figure
1-3.
1-10
Power Supplies/Fan Assembly-Level Troubleshooting
HP 8340B/41B
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