HP 6177B Operating And Service Manual

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Brand: HP

Category: Power Supply

Type: Operating and service manual for HP 6177B

Pages: 48

Download HP 6177B Operating and service manual

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Table
5-8.
Troubleshooting
Voltage
Limit
Circuit
(Continued)
STEP
I
ACTION
I
RESPONSE
PROBABLE
CAUSE
I
I
I
Check
turn-off
of
Q7
and
02-
by
a.
Output
current
rema
Ins
low,
I
c.
07,
08
shorted,
disconnecting
collector
of
06.
b.
Output
current
increases.
b.
Reconnect
collec-
tor
and
proceed
to
I
Step
2.
2
I
Eliminate
the
turn-on
circuit
as
a.
Output
current
increases.
a.
CR40.
C40
shorted,
c
source
0:
trouble
by
discor:.-
b.
Output
current
rema
ins
l.ow.
b.
Heconnect
CR40
necting
the
anode
of
CR40.
ana
proceed
to
Step
3.
I
3
ChecK
turn-off
of
Q6
by
shorting
a.
Output
current
remains
low,
a.
06
shorted.
05
emitter-to-colle
ctOf,
b.
Output
current
increases.
D.
Remove
short
and
I
!
I
proceed
to
Step
4.
4
ChecK
turn-on
of
QS
by
shorting
a.
Output
current
remains
low.
a.
05
open.
Q4-
emitter-to-collector.
b.
Output
current
increa
ses.
b.
Remove
short
and
proceed
to
Step
5.
5
Check
tum-on
of
04
by
opening
a.
Output
current
rema
ins
low.
a.
02,
04
open,
R81
VR2
near
the
consta
nt
current
shorted.
Open
source.
strap
between
AS
and
A6,
b.
Output
current
in
crea
s e
s,
b.
VR2
shorted.
Check
R5
and
R6
for
open,
Table
5-9.
Troubleshooting
the
Guard
Circuit
STEP
ACTION
RESPONSE PROBABLE CAUSE
PART
A.
UNIT
LOCKED-UP
1
Check
the
operation
of
22
by
a.
Output
current
decreases.
a.
22
defective.
switchir.g
21
and
22.
b.
Output
current
remains
high.
b.
Proceed
to
Step
2.
2
Check
operation
of
Q18
by
open-
a.
Output
current
remains
high.
a.
018A
open.
018E
ing
strap
between
terminal
Al
shorted.
CR15,
and
A2. CR16
shorted.
b.
Output
current
decreases.
b.
R40
shorted.
R37
open,
PART
Jl.
UNIT
LOCKED-DOWN
1
Check
operation
of
22
by
switch-
a.
Output
current
increases,
a.
22
defective.
ing
Z 1
and
Z2.
b.
Output
current
rema
ins
low.
b.
Proceed
to
Step
2.
2
Check
operation
of
018
by
short-
a.
Output
current
rema
ins
low.
a.
018
shorted.
021,
ing
AO
to
A!.
VRIO
open.
b.
Output
current
decreases.
b.
R40
open.
R36
shorted.
5-13