Eberline ESP-1 - Page 61

5-12
A
nonfunctioning
counter
can
be
recognized
by:
М '
B
Rate
meter
readout
too
low.
B Rate meter readout too high.
Ш Readout not statistical (erratic).
The
first
step
in
determining
any
problem
should
be
the
condition
of
the
batteries.
If
battery
life
is
shorter
than
specified,
tum
the
ESP-1
OFF
and
check
the
drain
on
the
batteries
by
inserting
an
ammeter
in
series
with
the
"+"
lead
from
the
battery.
The
current
should
be
less
than
50
pA.
With
the
ESP-1
turned
ON,
this
drain
should
be
less
than
25
mA
(with
no
alarm).
If
the
drain
is
too
high
in
either
condition,
isolate
the
faulty
component
and
replace
it.
Remember
to
look
for
leaky
capacitors,
but only
as
a
last
resort.
The
second
step
is to
check
all
voltages.
Use
table
4.
The
test
connector
(board
edge)
is
reached
through
the
side
access
door.
Viewed
through
the
access
door,
pin
1
is
toward
the
board
center,
side
A
is
on
top
of
the
board,
and
side
B
on
the
bottom
(component
side)
of
the
board.
(Refer
to figure
3-1.)
TEST
CONNECTOR
(FIG. 3-1) DESIGNATION LIMITS DESCRIPTION
10B Va +6 to +10 V Battery voltage
12B Ve +4.99 to +5.01 Y Regulated low voltage
9B +V +4.85 to 45.0 V Switched Ve
11B Van 45910 +10 У Switched Vg
9A V, Ою -1.5 V Display viewing angle bias
12A GND -- Reference
Table 4. Check Voltages
Any voltage not meeting the limits set establishes a reason for repair before proceeding. See
"Repairing the Low-Voltage Supply".
b. Nonfunctioning Microcomputer
(1) Check the TEST switch (S1). Both switch arms should be set toward the PC board. To
reinitialize the computer:
(a) Remove the batteries (at least 1).
(b) Short C1 (0.047 F capacitor). This can be reached through the side access door.
(Sce figure 3-1.) Allow 10 seconds.
(c) Reinstall batteries.
ESP1.MAN/February 1992