Wavetek 3000 - Module Servicing; Printed-Circuit Board Servicing

MAINTENANCE
is replaced with a new module,

it will
be necessary to calibrate the phase-
locked loop or other
circuits involved .
See CalibrationProcedure in this
sec-
tion .
MODULE-PIN NUMBERING SYSTEM
-The module
pins are numbered as shown
in
Figure
5-2
.
The off-centerindex
stud prevents the
module's being plugged in backward and
also provides a method for locating pin
#1 . NOTE : All 16pins arenot required
in each module ; only the pins actually
used are installed, butthe numbering
system remains the same .
INDEXSTUD
(off center)
BOTTOM VIEW
PIN SOCKET
Figure 5-2 .

Module
Pin
Numbering System
5 .2 .3 Printed-Circuit Board Servicing
PRINTED-CIRCUIT BOARDCONNECTORS - When
reinstalling a cable connector on a
printed-circuit board, be sure connector
is properly aligned with the board con-
nector pins and that connector
faces
proper direction (See Figure
5-3) .
CAUTION : Failure to properly
orientate
the connector can
result in damage to
modules or power
supply .
CABLE _
CONNECTOR
PCB
CONNECTOR
J
SIDE VIEW

END VIEW
RETAINING
CL IP
Figure 5-3 . Connector Alignment
METER-BOARD (C315) REMOVAL - Removal
of
the meter-board assemblyrequires
that
the attenuator dial, VERNIER knob and
potentiometerretaining nutand front
top rail be removed .

The meterboard is
secured to frontpanel by three screws -
one through front panel (behindatten-
uator dial) and one at each top corner
of meter board .

Remove these three
screws and disengagesix-pinconnector
from meter board .

Remove three
slip-
on wire connectors from attenuator
switch . The meter-board assemblycan
thenbe moved toward rear until the
VERNIER potentiometer
shaft, UNLEVELED
LEDand meter case
clear the front
panel ; then
the board can be lifted
from instrument .
The meter board is reinstalled by
re- .
versing the removal procedure .
NOTE :
When
installing
the meter board,
use
care not to damage the UNLEVELED Lamp .
MODULATION BOARD (C316) REMOVAL -

The
modulation-boardassembly can be re-
moved by the following procedure : Dis-
engage the slip-on connectors from the
six BCD FREQUENCY
switches ; remove the
black
spring-loaded knobs from the MODU-
LATIONMODE and FREQ
switches ;
remove
retaining nut
from
EXT modulation BNC
connector
;
disengage nine-pin connector
from
modulation board ; and remove one
screw at each top corner of modulation
board .

The board assembly can then be
moved toward rear until switch levers
clear the frontpanel ; then, the assembly
may be lifted from instrument .
The board assembly is reinstalled by
reversing the removalprocedure
.
NOTE :
When placing connectors on FREQUENCY
switches,
be sureeach connector
is on
correct switch, switchcables break out
of main harness
in same order

that
switches appear .
POWER SUPPLY BOARD REMOVAL - The Power
Supply board and heatsink can be removed
by removing the four screws which secure
the printedcircuit board to the instru-
ment rear panel . After removal of the
connecting harnesses, the board can be
carefully lifted from the instrument .