Motorola R2550 Service Manual

which 
snaps into 
the right 
front 
han-
dle  of the  unit.
4.  Take 
the power 
cord  that  is 
stored  in
the  cover.  Attach 
the cords  female
connector  to the  appropriate 
connec-
tor  on the 
Analyzers  rear panel.
Connect  the 
other  end of the  cord  to
the  power 
source.  For 
AC,  use 
a
grounded  3-wire 100-130 
VAC or
200-260  VAC power 
source.
5.  Set  the two-position  LINE 
switch
(bottom  of unit)  to 
either  the 110 
or
220  position, 
as applicable.  The 
fac-
tory  initially...

Figure 
1-1. 
1lO VACt220  VAC 
Selection  Switch 

1-5.4 
Battery  Pack fnstallation
l.  Se[  the 
R-2550  in 
an  inverted 
vertical
position  on a table  with 
the back  of
the  unit  facing 
upward.
Lay  battery  pack 
on the 
back  surface
of  the  R-2550 
such that 
the cut 
out  in
the  battery,  will 
match 
the locations
of  the  power 
plug 
on the  R-2550. Do
not  engage  the 
attachment  screw yet.
Plug  four-pin 
connector  from 
battery
pack  to four-pin 
connector  on back  of
R-2550  labeled  DC POWER. 4. 
Plug  AC cord  from 
batrery...

Section 
2
DESCRIPTION
2-I  DESCRIPTION
The  R-2550  Communication  System 
Analyzer  is
a  portable  test 
instrument  designed 
to 
monitor
and  service  radio 
communications  equipment
over  the frequency  range 
of 400  Hz 
to 9999999
MHz.  Figures  2-l 
and 2-2 
show  the 
Analyzers
controls,  indicators, 
and 
connectors,  and 
lists
their  functions.  The 
Analyzer  generates 
signals
measures  modulation 
and 
frequency,  and per-
forms  a variety  of 
tests  normally  associated  with
the...

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Figure  2-1. Front  Panel 
Controls,  Indicators, 
and  Connectors 

UNUSED 
CONNECTOR
RS.232  PORT
rO  M}IZ  REFERENCE
OSCILLATOR  IN/OUT
DC  INPUT  POWER
CONNTECTOR
REFERENCE  OSCILLATOR
CALIBRATION  ADJUST
LINE  VOLTAGE
SELECTOR  SWITCH
FUSES
AC  PLUG
INTERNAL/EXTERNAL
REFERENCE  OSCILLATOR
SWITCH
Flgre  2-2. 
Side,  Rear, 
and Bottom  Panels 

Numeric 
Keys (0-9)
For  entering  numeric information  into 
the
Analyzer.  When a key 
is pressed, 
the
existing  CRT numeral  (where 
the  cursor
is  sitting)  is 
replaced 
with the numeral
represented  by the 
keypress.  The Analy-
zer  then  reacts 
to 
the  new 
information
just  entered.  When an invalid 
numeric
entry  is 
attempted,  the Analyzer 
ignores
the  keypress 
and the 
numeral 
on the
screen  remains 
unchanged.
+/-  Key
Toggles  the 
displayed  sign from  its  pre-
sent  value 
to...

NOTE
The  CRT  has 
a screen  saver 
fea-
ture  that 
reduces  intensitY  after
approximately  30 
minutes 
of inac-
ilviry.  Press 
any  key  to restore 
the
display.
2-2.4  Connectors
2-2.4.1  trront 
Panel  Connectors
RF  IN/OUT
Provides  RF 
input 
signal  to the  Analy-
zers  internal  monitor 
or output  signal
from  the Analyzers  internal generator.
Also  provides 
combined  input/output  in
DUPLEX  mode. Contains  the 
RF  watt-
meter  load. 
This is 
the  only  front  panel
connector  to 
which...

2-2.4.3 
Back Panel 
Connectors  2-3 
BOTTOM 
CONTROLS
10  MHZ  STD  InternaUExternal 
Oscillator Micro-Switch
BNC  connector  provides 
input/output  for 
Used to  switch  between input 
and  output
10  MHz 
reference  frequency. 
Input 
configurations for 
ttre  rear  panel 
10 MHz
impedance  is 
50  ohms.  Input  level 
re-  reference 
oscillator BNC 
connector.
quirement  is 
70  mV 
to 1 
Vrms.  OutPut
level  is 
approximately  250 
uVrms.  CAUTION
The  R-2550  will not 
function  prop-
AC  POWER...

Section 
3
OPERATING  INSTRUCTIONS
3.1  GENERAL
The  Analyzer  is 
designed  specifically  for 
the
service  and 
monitoring  of  radio  communications
equipment.  This 
product 
represents  a break-
through  in 
simplicity  of operation.  In place 
of
numerous  meters, keys 
and controls,  the R-2550
employs  a large 
CRT display  which simulta-
neously  presents 
control and  data  displays.  A
simplified  front panel, 
utilizing  soft keys, 
cursor
movement  keys, 
a numeric  key pad, 
an analog...