Maintenance
—DM 5010
CPU
Board (A14).
Use
the specified detergent solution
or
isopropyl alcohol for cleaning. Rinse well with clean
isopropyl
alcohol or warm distilled water.
To
prevent instrument
damage and
performance deg
radation,
do not allow cleaning or rinsing solutions on
the
GPIB switches (S1515),
or on the battery or bat
tery
circuit.
Board cleaning
around the battery area
may be done if the
battery is removed first: however,
this
requires
new battery straps
for re-installation of
the battery and performance
of the adjustment proce
dure
to restore calibration constants in memory. To
help
protect
the
GPIB switches, apply wide tape to
the switch sides and top.
Isolation Board (A15).
Use the specified
detergent
solu
tion
for cleaning;
rinse well with distilled water.
Do
not
allow cleaning
or
rinsing
solutions on the trans
former. Isopropyl
alcohol
may be used for cleaning if
the transformer is first removed from
the board. Rinse
very
well with generous amounts of clean isopropyl
alcohol.
RMS Board
(A16).
For cleaning, use the specified deter
gent solution. Rinse with distilled water.
Isopropyl alcohol
may be
used for cleaning this board
if
the board is
very well rinsed with generous amounts
of clean isopropyl alcohol.
ADC Board (A 17)
and Relay Board (A 18).
For
cleaning,
use
the specified
detergent solution; rinse very well with
distilled water.
Isopropyl alcohol may be used for cleaning
provided the circuit
board is very well rinsed with generous
amounts
of clean
isopropyl alcohol.
J
CAUTfON <
Do
not
allow
cleaning
or rinsing solutions in or on the
rear input
relay (K1631 on the
Relay board), or the
guard
input
switch assembly
(S1731).
CPU
Board
Coating
Some solder
connections and
board surface areas of the
CPU board
are coated with a clear, moisture-proof material
called Humiseal. These areas are indicated by a
gray shad
ing
in Fig.
10-6 in the pullout pages (see lower rear area of
component side of board).
After any soldering on
these
areas,
the shaded
solder connections and board surfaces
must
be recoated
to ensure operation to specified perfor
mance
in a high humidity environment. Clean the worked
area
by
carefully scraping away the damaged portions of
the
coating. Remove
any flux residue; then reapply
Humiseal to the indicated
surfaces and solder
connections,
on
both sides of the board. Humiseal
may be obtained by
ordering
Tektronix Part
No. 006-1744-00.
TROUBLESHOOTING
Introduction
Troubleshooting information
for the DM5010 includes
detailed
instructions using traditional techniques and
signa
ture analysis for selected digital circuit troubleshooting.
For
troubleshooting
purposes, the
circuitry in the DM 5010 is
broken
into circuit sections.
Table 7-3 lists typical problem
symptoms for these sections.
Use these symptoms to help
select
the
malfunctioning circuit;
then
perform the verifica
tion
in the table
for the selected circuit. Any discrepancy
found in verification confirms that
the selected section is
malfunctioning.
If
the instrument symptoms suggest mal
functions
in several circuit sections, do the verification for
the
lower numbered section first. Then follow the detailed
troubleshooting
procedures listed by the
circuit
section and
number following the table. Although the troubleshooting in
formation
cannot address every
possible fault,
it may help
isolate
the problem
area. A review of the Theory of Oper
ation
section in this manual should also prove
helpful. Refer
to
board
illustrations adjacent to the
diagrams in the pullout
pages for component and test point locations.
If an error
code is either displayed on the instrument front
panel or
returned to
the controller
in response to an ERR?
query,
refer to
the
error
code definitions
in the Programming
section
of
this
manual. The only error codes that indicate
instrument malfunction
are those classified as Internal Er
rors in the
error
code list. The displayed error code 521
indicates
that the Signature Analysis switch is enabled. If
CAL
is displayed,
the internal CAL jumper is set for instru
ment adjustment.
Enabling the signature analysis or adjust
ment
mode affects normal
instrument operation.
For access to
troubleshooting points on the four rear
boards,
use the
DM5010 extender
boards
listed under
Troubleshooting Aids
in this
section of this manual. Also
listed
are flexible
extender cables
for operating the DM
5010
outside of the
power
module.
7-8
ADD JAN
1982
Summary of Contents for DM 5010
Page 14: ...DM 5010 2994 00 DM 5010 Programmable Digital Multimeter xii ADD JUL 1986...
Page 27: ...Operating Instructions DM 5010 2994 03 Fig 2 3 DM 5010 front panel controls and connectors 2 3...
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