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Model
5315A/
B
Service
~81.
Test
Procedure
4
Mk rocompute
r,
Oispl ..
y, .. nd
0
..... Bus
6-82.
To
verify the
proper
operation
of A1Ul Microcomputer, A2
Display
assembly and the
interconnecting
data bus, perform
the
following procedures:
a.
Perform POWER-UP SElf-CHECK. Apply
power
to the 5315A/B and press front panel
fREQ A and place POWER switch
to
ON. The power-up self-check
diagnostic
routine
lights
all
LED
segments in the 5315A/B display
for
approximately
1-second
as follows:
,-,
,-,
,-,
,-,
,-, LI
I , ,-,
BATTERY
DISCHG
CHG
Successfu
l
completion of power-up self-check
is
indicated by
no
error indications and
display
of:
BATTERY
DISCHG
CHG
b.
If the 5315A
has
powered-up properly, proceed to
Test
Procedure 3.
If any
error message
is displayed insu
re
the power supply voltages
are
within specifiations per
Test
Pro-
cedure
#1.
c.
If
error
message E1
was displayed
and
Tet
Procedure 1
was
completed
,
suspect
the
micro-
computer.
E1 indicates a failure
of the checksum on A1U1
interna
l
RAM and ROM.
Verify
by
substituting
a
known
good
IC
for A1U1.
d.
If
error
message
E2
is
disp layed the problem
is a short
o
n
one of
the microcomputer
pins.
Check pc
boards,
sockets, etc.
,
for
foreign material or
Ie's
connected
to
mi
crocomputer
for shorted
inputs.
e.
If
error
message
E3 was displayed
,
put
5315A/
8
into
DISPLAY CHECK mode (a
ll
func-
tion button
and
Blue button
"
OUT"). If
E2 is
now displayed
,
problem is
a short
on
one
of
the lines interconnecting the
MRC and
microcomputer. If E2 is
NOT
di~played,
problem may
be
the
MRC.
first
check oscillator INT/EXT
switch
position
-
A1S3 is
in
internal
position.
Next verify
presence
of oscillator signal on A1U2 pin 21, see
paragraph
8-83.
If
signa
l
is not present troubleshoot oscillator.
If
signal is to specs
place 5315A/8
into
check
function.
If display is not exactly 10.00 MHz
problem is
most
likely
in
A1U2. Verify
by
substitution of
a
good
unit.
f.
If display
is
thought to
be bad
refer
to
paragraph
3-29,
and perform the
disp
lay
check
routine.
Check socket
connecting
A2 and A5 for
poor
contact.
8-13
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