Ampex 351 - Page 88

Step 4:
Step 2:
Step 3:
Step 2;
Step 3:
8-15
Replacing the Resistor
Make mechanical joints by wrapping a turn
of each new resistor wire around the remnant
wires left from the old component. Perform
the soldering quickly and efficiently.
com-
can be accomplished as follows:
With the soldering iron, heat each
connection and brush away melted
solder. Some parts may require pry 
ing the mounting lugs perpendicular
to the board in order to brush away
the melted solder.
Trim the lugs as close as possible to
the board.
Again apply the soldering iron to the
connections, brush away the melted
solder.
Insert replacement component and
solder the connections.
89-0144
Issue A
Solder Method of Removing and
Replacing Components
On the wiring side of the board at the com 
ponent to be replaced, heat the connections
with an iron until the solder melts. Quickly
remove the iron and brush away the solder
using the wire brush. Two or more heating
passes may be required; but take special care
to avoid excessive heat.
Now the mechanical joint will be revealed.
Inserfa knife blade between the board and the
exposed wire, and carefully raise the wire until
it is perpendicular to the board and will come
free in the next step. Again apply the soldering
iron to the connection point while simultan 
eously moving the lead back and forth until
it breaks free of the molten solder.
Take the replacement component, cut the
leads to the desired length, insert them into
the holes, bending the leads against the board
to make mechanical connections, and solder
the connections.
Replacing of Tube Sockets
Step 1;
ORDERING PARTS
The purpose of the parts list is to aid you
in ordering replacement parts. Ampex can offer
fast and efficient service in providing normally
replaceable parts of the components in the
system when proper information is furnished.
Parts listed according to the schematic refer 
ence symbol, a description of the part and the
Ampex part number. The Ampex Corporation
offers some replacement parts that are not
necessarily exact replicas of those 'used on the
original version of the equipment; but these
parts are interchangeable with the original
parts. The description column names the part,
its composition, electrical value and manufac 
turer ’ s number (or military specification when
available) — and the AMPEX PART NUMBER.
Ampex part numbers are the exact designa 
tion for all parts used in Ampex equipment.
For example, CAPACITOR, fixed : ceramic, .02
uf + 80%-20%, 500 vdew; Sprague Part No.
36C205 will always bear the Ampex catalog
number 54-0265. THIS IS THE NUMBER YOU
SHOULD USE WHEN ORDERING REPLACE 
MENT PARTS. The schematic reference num 
ber should NOT be used for ordering purposes
as it will vary with different equipment types.
Include the following information when order 
ing parts: Equipment Type, Equipment Serial
Number, Ampex Part Number, Description of
Part. Example: 4 ea 54-0265 capacitors for Series
351.
Replacing Electrolytic Capacitors,
Relays and Coils
The replacement of these types of
ponents
Step 1:
Removing a Resistor
A convenient method of removing resistors
is to clip the leads with cutters, leaving suffi 
cient wire at each point so that wiring termi 
nals remain. New components can be soldered
to these remnant leads. With soldering iron, heat each con-
tion and brush away melted solder. If
the connections do not come free on
the first pass, repeat the heating pro 
cess until connections are broken.
With a pen knife inserted between the
socket lug and wiring foil, bend each
lug upward • — except the grounding
lug.
When all socket lugs have been freed
from the wiring foil, heat the ground 
ing lug until the solder melts and
slowly pull the socket away from the
board.