Operating instructions
Maintenance---71387
Figure
8-2,
in
the
front
of
the
diagrams
section,
shows
the
location
and
assembly
number
of
each
circuit
board
in
this
instrument
.
SWITCH
CAM
IDENTIFICATION
Switch
cam
numbers
shown
on
diagrams
indicate
the
position of
each
cam
in
the
complete
switch
assembly
.
The
switch
cams
are
numbered
from
front
to
rear
.
DIODE
COLOR
CODE
The
cathode
end
of
each
glass-encased
diode
is
indicated
by a
stripe,
a
series of
stripes,
or
a
dot
.
The
cathode
and
anode
ends
of
metal-encased
diodes
are
identified
by the
diode
symbol
marked
on the
case
.
For
most
silicon
or
germanium
diodes with a
series
of
stripes,
the
color
code
identifies
the
four
significant
digits
of
the
JEDEC
or
vendor
number
using
the
resistor
color-code
system
(e
.g
.,
a
diode
color-coded
yellow-brown-green-red
indicates
a
1N-4152
diode)
.
Figure 4-
3
.
Inter-board multi-pin
connector
assembly
.
WIRING
COLOR
CODE
Insulated
wire
and
cable used
in
this
instrument
is
color-
coded
to facilitate
circuit
tracing
.
SEMICONDUCTOR
LEAD
CONFIGURATIONS
Figure
4-2
illustrates
the
lead
configurations
for
all
semiconductors
used
in
this
instrument
.
Some
plastic-
case
transistors
have
lead
configurations
that
do not
agree
with
those
shown
here
.
If
a
replacement
transistor
is
made
by a
different
manufacturer
than the
original,
check
the manufacturer's
lead
configuration
diagram
.
All
transistor
sockets
in
this
instrument
are
wired
for
the
standard
lead
configuration
used
for
metal-case
transistors
.
INTER-BOARD
PIN
CONNECTOR
IDENTIFICATION
The
inter-board
pin
connector
sockets
are
installed
on
circuit
boards,
in
groups
of
5
sockets
(as
in
Fig
.
4-3)
.
Socket
number
1
is
indexed
on
the
circuit
board with
either
a
triangular
mark
or
the
number
1
.
Each
group
of
sockets
is
identified
by
its
J
(jack)
number
etched
on
the
circuit
board
.
The
J
numbers
correlate
to
the J
(jack)
and
P
(plug)
circuit
numbers
on
the
schematic diagrams
.
MULTI-PIN
CONNECTOR
IDENTIFICATION
Multi-pin
connectors
mate
with
groups
of
pins soldered
to
circuit
boards
.
Pin
number
1
is
indexed with a
triangular
mark
on the
circuit
board
and molded
on
the
holder
of
the
multi-pin
connector,
as
shown
in
Figure
4-
4
.
Each
group
of
pins
is
identified
by
its
corresponding J
END-LEAD
MULTI-PIN
CONNECTOR
INDEX
END-LEAD
MULTI-PIN
CONNECTOR
Figure
4-4
.
End-lead
multi-pin
connector assembly
.