Maintenance
—
DM 5010
Signature
Analysis
Signature
analysis information for troubleshooting
some
DM
5010 digital circuitry
is provided
in the pulout pages in
the back of this
manual. It is probable that, over a period of
time,
product modifications and
updates will become avail
able, or necessary,
or
both. Due to the impact
they
have
on
instrument diagnostics
and firmware, some modifications
and updates must be installed
in a serial manner; that is, all
earlier
modifications
and
updates may be a prerequisite to
installation of the most recent one requested or suggested.
To determine the
applicable signature version for your
instrument,
compare
the
board assembly (670-) and
firmware (1
60-) numbers in the DM 5010 Signature Versions
Table (in the back of this section) with those on the instru
ment
boards. Use the signature
analysis information in
the
pullout
pages
for the
signature version indicated
in the table
for
your
instrument
board and firmware configuration.
Signature
Table 10A provides signature analysis infor
mation
for
checking
the
microprocessor,
ROM, and address
decoding
on the CPU
board. The DM 5010 setup informa
tion for these checks requires positioning the NOP jumper
to
disable
bidirectional buffer U1435 and the buffered data
bus.
It also enables the NOP buffer, which sends NOP (no
operation)
instruction
code to the
microprocessor. This code
causes
the microprocessor to sequentially address each
memory space in
ROM.
Signature analysis verifies that the
data
read
from ROM is correct, thus ensuring that the
microprocessor, data
bus,
and ROM are operational. After
checking
signatures, reset
the NOP jumper to the normal
operating
position.
The instrument must be powered down
and
then back up to reset the microprocessor to normal
operation.
Signature
Table
10B checks
the
range shift registers.
These
tests require
setting
the DM 5010
Signature Analysis
switch to the SA mode. This causes the microprocessor
to
read
and perform a special signature analysis routine.
This
routine uses
a repeatable pattern to set
the registers to
known
states.
WARNING
I
Dangerous voltages
may be encountered in
the fol
lowing
troubleshooting procedures. Caution must be
exercised. Do not contact
the output connectors of
the voltage source, or the
input connectors or internal
circuitry
of the DM 5010.
Table
7-3
TYPICAL TROUBLE SYMPTOMS
Typical
Symptoms
Circuit
Section—Verification
Extinguished or unchanging display.
CPU
Board,
Diagram 7
j
1a. POWER SUPPLIES
—Check for +5 V de on P1731-1A or 1B
and 2A or 2B
:
(gnd).
lb.
CLOCK
—Check for 1
MHz squarewave between TP1535 (CK) and TP1531
(gnd).
lc.
PON CIRCUIT
—
Check for TTL logic 1 at U1320-40 (PON).
Unchanging or flickering display, or
inter
nal error code.
CPU
Board, Diagrams
7, 8
2. MICROPROCESSOR—Place
NOP jumper
P1425
in the enable position.
Check
for
a squarewave on the buffered
address lines at U1235
and U1420A;
each line should be
one-half the frequency of the previous line, going from BA0 to
BA11. Check the outputs of U1620 and U1520. Check that the ROM
Enables
(pin
18 of U1200, U1300, U1305,
and U1400) are not locked high or low. With
power
off,
reposition the
NOP jumper to connect J1425,
pins 1 and
2. Apply
power and check that the
data lines
on both sides of U1435 are not locked high
or
low. Check
that IRQ at U1320-4 is not
locked low. Check that VMA and R/W
(U1
320-5
and 34) are toggling.
ADD
JAN
1982
7-9
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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Page 251: ...Section 8 DM 5010 OPTIONS No options are available 8 1...
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Page 272: ...DM 5010 2994 37 Fig 10 2 Location of DM 5010 adjustments and test points...
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Page 337: ...63 REV JUN 1986...
Page 338: ...FIG 1 EXPLODED DM 5010...
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