Model 162B
e. To remove components with multiple connections
, such as potentiometers or tube sockets clip the pins
Short with pliers and remove each pin separately, or use a
Together Effect Fault re-soldering tip such as Ungar #855 on the soldering
iron.
Pins 1 and trace centers Model 162B
Of p301 5-24. Table 5-5 lists the adjustments recommended
trace does not Model 160B/170A after replacement of tubes or diodes.
center
5-25. LOCATION OF PARTS. Figures 5-1 through
Pins 3 and trace centers input and differen- 5-4 show the location of components not part of an
8 of V103 tial amplifier assembly. These components are listed by reference
designator and cross-referenced in table 6-1. Table
trace does not R319 6r V303
center 6-1 lists all components included in each assembly,
and these components are for the most part identified
by silkscreening or by panel engraving.
Pins 2 and trace centers V101, 102
Of 'lo3
trace does not V103
center
C126 R153
Note: Same procedure may be used for channel B.
~ -1
I L
5-22. REPAIR.
5-23. If replacement of components on the etched
circuit boards proves necessary, follow the general
procedure outlined below:
MP-4-1254
a. To remove components from the board use 8
low-wattage soldering iron such as Ungar #1235 Figure 5-1. Parts Location, Channel A Attenuator
heating unit with #776 handle and #PL333 tip. Apply
just enough heat to melt the solder and remove the
component.
b. After the component has been removed, clear
the hole by melting the solder and inserting a wooden R250 C214 R256 C224
toothpick in the hole. C212\51\ R27? \ C2,22 1
Note \\ R255 R224 L205
Using a metal tool may damage the plating
in the hole.
c. Bend the leads of the new component to the
proper spacing and insert in the board. Apply solder
from the side of the board opposite the component.
Note
Excessive heat may lift an isolated conductor
pad from the board. If this occurs, solder
the connection from the component side of
the board . Ci33 ' 'R260
d. Use pliers as a heat sink when soldering semi- MP-S-1255
conductor diodes. Grip the leads close to the diode
MY. Figure 5-2. Parts Location, Channel B Attenuator
5-4 01558-1 |
ACEC
