Radio Shack Pro-60 User manual
Radio
/hack
Service
PRO-60
PROGRAMMABLE
SCANNER
Catalog
Number:
20-309/9309
CONTENTS
Page
Specifications.2
Block
Diagram.4
Theory
of
Operation.5
General
Operation
Outline.
6
Reception
Check.8
Alignment
and
Adjustment.
9
Troubleshooting.
15
Printed
Circuit
Boards.
18
Wiring
Diagram.21
Exploded
View.22
Mechanical
Parts
List.
23
Electrical
Parts
List.
24
Semiconductor
Lead
Identification.47
Microprocessor
(1C
1)
Port
Format.
5
2
Schematic
Diagram.53
©
1995
Tandy
Corporation.
All
Rights
Reserved.
Radio
Shack
is
a
registered
trademark
used
by
Tandy
Corporation.
20-309/9309
SPECIFICATIONS
Frequency
coverage
30
MHz-87.495
MHz
5
kHz
steps
87.5
MHz-107.950
MHz
50
kHz
steps
-
108
MHz-136.975
MHz
25
kHz
steps
137
MHz-224.995
MHz
5
kHz
steps
225
MHz-399.9875
MHz
12.5
kHz
steps
400
MHz-512
MHz
12.5
kHz
steps
*1
760
MHz-824
MHz
12.5
kHz
steps
*1
849
MHz-869
MHz
12.5
kHz
steps
‘1
894
MHz-999.9875
MHz
12.5
kHz
steps
*1
760
MHz
-999.9875
MHz
for
20-9309
—
Unit
Nominal
Limit
Sensitivity
NFM:
(S+N)/N=20
dB
30-512
MHz
pV
1
2
Dev.:
3
kHz
at
1
kHz
760-999.9875
MHz
pV
1
3
AM:
(S+N)/N=20
dB
30-512
MHz
pV
2
5
—
Mod.
60%
at
1
kHz
760-999.9875
MHz
pV
2
5
WFM:
(S+N)/N=30
dB
30-512
MHz
pV
3
10
Dev.
45
kHz
at
1
kHz
760-999.9875
MHz
pV
3
10
Squelch
sensitivity
NFM
and
AM
Threshold
pV
0.5
2
Tight
dB
25
15
—
WFM
Threshold
pV
3
10
Tight
dB
40
30
Spurious
rejection
at
328
MHz
(NFM)
dB
40
30
_
(except
primary
image)
Modulation
acceptance
(EIA
.
RS-204-A)
—
NFM
kHz
±8
±5
WFM
kHz
±150
±75
—
Signal
to
noise
ratio
NFM
Dev.:
3
kHz
at
1
kHz
30-512
MHz
dB
40
30
—
Input
100
pV
760-999.9875
MHz
dB
35
25
AM
Mod.:
60%
at
1
kHz
30-512
MHz
dB
40
30
Input
100
pV
760-999.9875
MHz
dB
40
30
—
WFM
Dev.:
45
kHz
at
1
kHz
30-512
MHz
dB
50
35
i
Input
100
pV
760-999.9875
MHz
dB
50
35
—
2
—
Unit
Nominal
Limit
Residual
noise
Volume
control,
set
to
its
minimum,
squelched
mV
3
5
Scanning
rate
channels/sec.
25
22-28
Search
rate
steps/sec.
50
47-53
Priority
sampling
sec.
2
1-3
Scan
delay
time
sec.
2
1-3
Audio
output
power
10%
THD
mW
180
150
Current
drain
Squelched
mA
100
115
Channels
of
operation
Channels,
frequency,
and
mode
display
Receiving
system
Power
source
Jacks
Dimensions
(HWD)
Weight
Any
200
channels
in
any
b~nd
combination
Liquid
crystal
display
Direct
key
entry
digital-control
synthesizer,
1st
IF:
608.005-611.2
MHz
2nd
IF:
45
MHz
3rd
IF:
10.7
MHz
(WFM),
455
kHz
(NFM/AM)
9
V
DC
negative
ground
only
6
AA
batteries
or
a
suitable
adapter
Antenna,
earphone,
external
power,
and
charge
5
7/8x2
1/4
x
1
3/4
inches
(150
x
62
x
44
mm)
8.8
oz.
(250
g)
without
antenna
and
batteries
Note:
Nominal
specs
represent
the
design
specs.
All
units
should
be
able
to
approximate
these—some
will
exceed
and
some
may
drop
slightly
below
these
specs.
Limit
specs
represent
the
absolute
worst
condition
that
still
might
be
considered
acceptable:
in
no
case
should
a
unit
fail
to
meet
limit
specs.
—
3
—
BLOCK
DIAGRAM
Batteries
THEORY
OF
OPERATION
The
PRO-60
is
a
PLL
(Phase-Locked
Loop)
synthesized
VHF/UHF,
AM/FM
receiver,
controlled
by
a
CPU
(Central
Processing
Unit)
via
a
keyboard.
Receiving
mode
and
search
step
are
initially
set
to
correspond
with
the
frequencies
entered.
When
a
frequency
within
the
FM
broadcast
band
is
keyed
in,
the
receiving
mode
is
set
to
wideband
FM
(WFM).
When
a
frequency
in
the
active
radio
band,
such
as
police,
fire,
and
ham
radio,
is
keyed
in,
the
mode
is
set
to
narrowband
FM
(NFM),
and
when
a
frequency
in
the
aircraft
band
is
keyed
in,
it
sets
to
AM
mode.
The
mode
can
also
be
changed
by
the
AM/FM/WFM
key.
All
functions,
such
as
the
receiving
frequency
range,
frequency
determination,
scanning
an
1
delay
time,
etc.
are
controlled
by
the
CPU
(IC1).
The
CPU
is
able
to
do
only
the
assigned
functions
and
no
me'
.cation
of
the
CPU
is
feasible.
The
following
paragraphs
explain
the
operation
of
the
circuit
in
terms
of
the
functional
blocks:
Varactor
(variable
capacitance
diode)
tuning
(automatic
tuning
system)
is
employed
on
all
bands.
The
RF
input
circuit
consists
of
the
bandpass
filters
(BPF).
A
signal
generated
by
VCOI
or
VC02
is
applied
to
the
1st
mixer
and
mixed
with
the
RF
signal.
The
1st
mixer
is
employed
to
facilitate
30
MHz
to
999.9875
MHz
mixing.
The
1st
IF
(Q106)
is
608.005
-
611.2
MHz,
and
the
signal
is
mixed
with
VC03
frequency
at
the
2nd
mixer
(Q107)
to
produce
a
45
MHz
signal.
Corresponding
with
the
input
from
the
keyboard,
the
CPU
selects
VCOI
or
VC02
and
determines
the
AM/NFM/WFM
data
of
the
PLL
circuit
that
will
function;
then
it
outputs
the
necessary
data.
A
signal
entered
to
NFM/AM
IF
is
mixed
with
crystal
oscillation
frequency
44.545
MHz
at
the
3rd
mixer
(IC301)
and
converted
to
a
455
kHz
signal.
A
signal
entered
to
WFM
IF
is
mixed
with
crystal
oscillation
frequency
34.3
MHz
at
the
3rd
mixer
(IC302)
and
converted
to
a
10.7
MHz
signal.
The
signal
is
further
amplified
to
be
detected
as
an
AF
signal.
The
AF
signal
of
AM,
NFM,
and
WFM
is
CPU-controlled
and
applied
to
the
AF
power
amplifier
(IC306)
via
a
switching
circuit.
Squelch
signals
are
comprised
of
noise
products
from
detector
output,
and
amplified
by
IC301
through
a
switching
signal,
which
controls
the
AF
mute
and
CPU.
CXI
(4.19
MHz)
is
a
clock
which
controls
the
CPU.
Figure
A
shows
the
clock
waveform
at
IC1
pin
58.
The
unit
has
a
battery-saving
control
in
manual
mode.
When
the
unit
is
in
operation,
IC1
pin
61
is
M
H
"
and
IC309
is
on.
If
there
has
been
no
signal
input
or
no
key
input
for
more
than
5
seconds
in
manual
mode
with
squelch
on,
pin
61
goes
"L"
(Figure
B),
turning
off
IC309
to
shut
off
the
power
supply
for
most
of
the
circuits
(except
the
CPU
and
audio
circuit).
In
this
battery-saving
mode,
the
unit
uses
only
40%
of
the
power
required
for
normal
operation.
Any
unstable
supply
voltage
to
the
CPU
can
produce
a
CPU
malfunction,
such
as
wrong
data
processing,
wrong
data
transfer,
etc.
To
overcome
this,
the
CPU
can
be
initialized
when
necessary.
To
initialize
the
CPU,
press
and
hold
CLEAR
and
0,
and
then
turn
on
the
power.
Figure
A
Figure
B
GENERAL
OPERATION
OUTLINE
1
2
Turn
on
the
KEY
LOCK
switch
so
the
keys
will
not
function
except
SCAN,
MAN,
and
LIGHT.
RECEPTION
CHECK
—
8
—
ALIGNMENT
AND
ADJUSTMENT
ALIGNMENT
AND
TEST
POINTS
and
Cl
88
(10
pF)
are
connected.
ALIGNMENT
PREPARATION
Test
Equipment
Required
•
Oscilloscope
•
AC
SSVM
•
DC
SSVM
•
8-ohm
dummy
load
•
AM/FM
signal
generator
Notes:
•
Use
non-metallic
tuning
tools.
•
The
test
equipment
and
receiver
should
be
warmed
up
for
at
least
10
minutes
before
proceeding
with
align¬
ment.
•
The
signal
level
from
the
generator
should
be
kept
as
low
as
possible
to
obtain
a
usable
output.
•
Distortion
meter
•
Frequency
counter
Program
channels
1
through
10
are
as
follows:
Table
1
Channel
Frequency
and
Band
Mode
Channel
Frequency
and
Band
Mode
1
512
MHz
(NFM)
6
^
155
MHz
(NFM)
2
98
MHz
(WFM)
7
225
MHz
(NFM)
3
30
MHz
(NFM)
8
126
MHz
(AM)
4
760
MHz
(NFM)
9
31.995
MHz
(NFM)
5
999.9875
MHz
(NFM)
10
32
MHz
(NFM)
—
9
—
ALIGNMENT
PROCEDURES
PLL2
VCO
Alignment
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFF/VOLUME
control:
ON.
SQUELCH
control:
Fully
counterclockwise
(CCW).
Select
channel
3.
Connect
DC
SSVM
to
TP103.
See
Figure
1.
LI
28
Adjust
LI
28
to
2.4+0.1
volts
on
the
DC
SSVM.
See
Table
2.
PLL1
VCO
Alignment
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFFA/OLUME
control:
ON.
SQUELCH
control:
CCW.
Select
channels
3
and
4.
Connect
DC
SSVM
to
TP102.
See
Figure
2.
LI
25
1.
Select
channel
3
and
adjust
LI
25
for
25.5±0.5
volts
on
the
DC
SSVM.
2.
Select
channel
4
and
be
sure
the
DC
SSVM
reads
0.8-3.0
volts
(no
adjustments
are
necessary
for
the
coil).
See
Table
2.
DCSSVM
DCSSVM
Figure
1
Figure
2
Ajustment
of
Coils
LI
25
and
LI
28
Each
coil
should
be
adjusted
carefully
by
changing
the
pitch
of
the
coil
little
by
little
by
using
a
non-metallic
tuning
tool
as
shown
in
Figure
3.
Squeeze
the
coil
to
increase
the
voltage
and
stretch
the
coil
to
decrease
the
voltage.
Notes:
•
Be
very
careful
when
doing
coil
pitch
adjustment
be¬
cause
it
greatly
affects
the
frequency.
•
Secure
the
coil
with
glue
after
alignment.
Be
sure
the
glue
is
dry
and
the
coil
is
secured.
Also,
be
sure
that
the
environmental
temperature
is
normal.
Then,
repeat
VCO
(PLL2
and
PLL1)
alignments
above.
Figure
3
Coil
/-
Use
non-metallic
tuning
tool
uumfj
RF
PCB
Table
2
CH
Frequency
Voltage
m
30
MHz
30
MHz
760
MHz
Voltage
at
TP103:
2.3-2.5
volts
Voltage
at
TP102:
25-26
volts
Voltage
at
TP102:
0.8-3.0
volts
—
10
—
Reference
Frequency
Osc.
Alignment
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFF/VOLUME
control:
ON.
SQUELCH
control:
CCW.
Select
channel
1.
Connect
the
frequency
counter
to
TP101.
See
Figure
4.
TCI
02
Adjust
TCI
02
so
the
frequency
is
1123.200000
MHz
±
200
Hz.
Unit
°-
TP101
Frequency
Counter
Under
Test
.
1
Figure
4
Note:
If
no
frequency
counters
capable
of
measuring
1200
MHz
are
available,
use
a
frequency
counter
capable
of
measuring
20
MHz.
Follow
the
instructions
below
so
the
frequency
counter
can
do
an
appropriate
adjustment.
1.
The
frequency
counter
for
measurement
should
be
accurate
within
1
Hz.
2.
Be
sure
a
2
pF
capacitor
is
connected
to
the
end
of
the
cable
of
the
signal
line.
The
unit
would
be
destroyed
if
you
did
not
use
this
capacitor.
If
a
capacitor
other
than
the
2
pF
capacitor
is
used,
or
if
the
capacitor
is
connected
anywhere
other
than
the
end
of
the
measurement
cable,
correct
measurement
will
never
be
obtained
because
of
the
effects
on
the
oscil¬
lator.
3.
Be
sure
the
coaxial
cable
for
measurement
is
as
short
as
possible
(shorter
than
1
meter)
to
avoid
stray
capaci¬
tance
effects.
4.
Test
point
locations
and
adjustment
frequency
range
are
as
follows:
Pin
15
of
IC101
and
Cl
88
(10
pF)
are
connected
to
a
through
hole,
as
shown
in
"Alignment
and
Test
Points
"
(Page
9).
Connect
a
2
pF
capacitor
at
a
through
hole
pattern
location
and
then
adjust
TCI
02
so
that
the
frequency
range
is
12.799937
MHz
±2
Hz.
Figure
5
NFM/AM
Discriminator
Coil
Alignment
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFFA/OLUME
control:
ON.
SQUELCH
control:
CCW.
Select
channel
1.
Connect
the
signal
generator
to
the
Ant.
connector
and
the
DC
SSVM
to
TP301.
See
Figure
6.
T301
Set
the
signal
generator
frequency
to
512
MHz,
100
pV
output
(no
mod.),
and
adjust
T301
to
1+0.1
volt
on
the
DC
SSVM.
—
ii
—
WFM
Discriminator
Coil
Alignment
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFF/VOLUME
control:
ON.
SQUELCH
control:
CCW.
Select
channel
2.
Connect
the
signal
generator
to
the
Ant.
connector
and
the
DC
SSVM
to
TP301.
See
Figure
6.
T302
Set
the
signal
generator
frequency
to
98
MHz,
100
pV
output
(no
mod.),
and
adjust
T302
to
1.8±0.1
volts
on
the
DC
SSVM.
DC
SSVM
Figure
6
45
MHz
2nd
IF
Coil
Alignment
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFF/VOLUME
control:
ON.
SQUELCH
control:
CCW.
Select
channel
8.
Connect
the
signal
generator
to
the
Ant.
connector,
and
the
oscilloscope,
AC
SSVM,
distortion
meter,
and
8-ohm
load
to
EXT.
speaker
jack.
See
Figure
7.
T102
T103
1.
Set
the
signal
generator
fre¬
quency
to
126
MHz.
AM:
60%
modulation
at
1
kHz
and
output
at
S/N
20
dB
point.
2
.
Adjust
T102
and
T103
for
maximum
sensitivity.
IF
Trap
Trimmer
Capacitor
Alignment
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFF/VOLUME
control:
ON.
SQUELCH
control:
CCW.
Select
channel
1.
Connect
the
signal
generator
to
the
Ant.
connector,
and
the
oscilloscope,
AC
SSVM,
distortion
meter,
and
8-ohm
load
to
EXT.
speaker
jack.
See
Figure
7.
TCI
01
1.
Set
the
signal
generator
fre¬
quency
to
611.2
MHz.
FM:
3
kHz
deviation,
1
kHz
modulation,
and
output
ap¬
prox.
300
pV.
2.
Adjust
TCI
01
to
minimum
sensitivity.
Signal
Generator
8-ohm
Load
ANT
Connector
EXT
Spkr
Jack
/
AC
SSVM
£
^
Unit
—^
Under
Test
X
\
Oscilloscope
Distortion
Meter
\
-12-
Figure
7
1st
IF
BPF
Coil
Alignment
Normally,
additional
adjustment
is
not
necessary
for
BPF
coil
T101
since
it
has
been
factory
aligned.
Only
when
the
shape
or
pitch
of
T101
gets
changed
accidentally,
readjustment
is
required
as
described
below,
referring
to
Figure
7.
Control
Setting
Test
Instrument
Connection
Adjust
Result
OFF/VOLUME
control:
ON.
SQUELCH
control:
CCW.
Select
channels
9
and
10
.
Connect
the
signal
generator
to
the
Ant.
connector,
and
the
oscilloscope,
AC
SSVM,
distortion
meter,
and
8
-
ohm
load
to
EXT.
speaker
jack.
See
Figure
7.
T101
1.
Select
channel
9
and
set
the
signal
generator
frequency
to
31.995
MHz.
FM:
3
kHz
deviation.
1
kHz
modulation,
and
0.5
7
out¬
put.
2.
Adjust
T102
to
maximum
sensitivity.
3.
Select
channel
10
and
set
the
signal
generator
fre¬
quency
to
32
MHz.
FM:
3
kHz
deviation
at
1
kHz
and
0.5
pV
output.
4.
Readjust
T102
to
maximum
sensitivity.
Note:
Align
the
balance
of
channel
9
and
channel
10
sensitivity
to
be
the
same.
See
Figure
8
.
(1st
IF
Center
Frequency
(609.6
MHz)
Figure
8
—
13
—
Zeromatic
Function
Test
Procedure
Zeromatic
function
operates
when
output
is
"H."
0
<
el
<
e3
e3
<
el
<
e2
e2
<
el
<
Vcc
Output
(D305
Cathode)
L
H
L
To
adjust
voltage
el,
receive
the
signal
in
manual
mode
and:
•
In
AM/NFM
mode,
set
T301
to
obtain
1.0
±0.1
volt
DC
at
TP301.
•
In
WFM
mode,
set
T302
to
obtain
1.8
±0.1
volt
DC
at
TP301.
See
"NFM/AM
Discriminator
Coil
Alignment"
and
"WFM
Discriminator
Coil
Alignment"
on
Page
11
and
12.
If
the
zeromatic
does
not
function
correctly,
refer
to
"Reference
Frequency
Osc.
Alignment"
(Page
11),
check
that
the
frequency
is
1123.200000
MHz
±200
Hz,
and
adjust
discriminator
coil
(T301,
T302).
—
14
—
TROUBLESHOOTING
Symptom
Possible
Cause/Remedy
Display
does
not
light
and
no
sound
comes
out
when
power
is
on
Volume
control:
Maximum
(MAX)
Squelch
control:
Counterclockwise
(CCW).
•
Defective
batteries:
Replace.
•
Wrong
polarity
of
batteries:
Correct
the
polarity
of
batteries.
•
Defective
power
jack
or
charge
jack:
Replace.
•
Defective
ON/OFF
switch
on
volume
control:
Replace.
Display
lights
but
there
is
no
sound
Volume
control:
MAX
Squelch
control:
CCW
•
Defective
speaker
or
headphone
jack:
Replace.
•
Defective
audio
amplifier
circuit
(IC306)
and/or
associated
circuit:
Replace
the
defective
components.
•
Defective
IF
amplifier
(IC301)
and/or
associated
circuit:
Replace
the
defective
components.
•
Defective
squelch
control
(VR301)
and/or
associated
circuit:
Replace
the
defective
components.
•
Defective
AF
pre-amp
circuit
(Q307)
and/or
associated
circuit:
Replace
the
defective
components.
•
Defective
audio
mute
switching
circuit
(Q308)
and/or
associated
circuit:
Replace
the
defective
components.
•
Defective
switching
circuit
(IC303)
and/or
associated
circuit:
Replace
the
defective
components.
Sound
comes
out
but
display
does
not
light
Volume
control:
MAX
Squelch
control:
CCW
•
Defective
LCD
or
rubber
connector:
Replace
the
defective
components.
•
Defective
CPU
(IC1):
Replace
IC1.
Does
not
scan
and
squelch
does
not
operate
•
Defective
IC301
or
IC302
squelch
control
terminal:
Replace
IC301
or
IC302.
Does
not
scan
but
squelch
operates
•
Defective
CPU
(IC1):
Replace
IC1.
Shows
correct
display
at
the
time
of
programming,
but
after
scanning,
shows
faulty
display
•
Defective
CPU
(IC1)
and/or
associated
circuit:
Replace
the
defective
components.
Sound
does
not
come
out
in
NFM
mode
but
AM
and
WFM
operate
•
Defective
1C
1:
Replace.
•
Defective
control
circuit
(IC303,
IC305)
and/or
associated
circuit:
Replace
the
defective
components.
—
15 —
Symptom
Possible
Cause/Remedy
Sound
does
not
come
out
in
AM
mode
but
NFM
and
WFM
operate
•
Defective
1C
1:
Replace.
•
Defective
switching
circuit
(IC303,
1C305)
and/or
associated
circuit:
Replace
the
defective
components.
Sound
does
not
come
out
in
AM
and
NFM
modes
but
WFM
operates
•
Defective
IC301
and/or
associated
circuit:
Replace
the
defective
components.
Sound
does
not
come
out
in
WFM
mode
but
AM
and
NFM
operates
•
Defective
IC1:
Replace
IC1.
•
Defective
switching
circuit
(IC303,
IC305,
Q303,
Q304,
Q306)
and/or
associated
circuit:
Replace
the
defective
components.
Sound
does
not
come
out
in
WFM
and
AM
modes
but
NFM
operates
•
Defective
IC102
and/or
associate
circuit:
Replace
the
defective
components.
•
Defective
switching
circuit
(IC303,
IC305)
and/or
associated
circuit:
Replace
the
defective
components.
Low
sensitivity
between
30.000
and
87.495
MHz
•
Defective
decoder
switching
circuit
(Q101):
Replace
Q101.
•
Defective
bandpass
filter
(BPF):
Replace
the
defective
components.
Low
sensitivity
between
87.5
and
174
MHz
•
Defective
switching
circuit
(Q102):
Replace
Q102.
•
Defective
BPF:
Replace
the
defective
components.
Low
sensitivity
between
174.005
and
350
MHz
•
Defective
switching
circuit
(Q102):
Replace
Q102.
•
Defective
BPF:
Replace
the
defective
components.
Low
sensitivity
between
350
and
512
MHz
•
Defective
switching
circuit
(Q103):
Replace
Q103.
•
Defective
BPF:
Replace
the
defective
components.
Low
sensitivity
between
760
and
999.9875
MHz
•
Defective
switching
circuit
(Q103):
Replace
Q103.
•
Defective
BPF:
Replace
the
defective
components.
Does
not
operate
between
30
and
512
MHz
•
Defective
QUO
and/or
VC01
circuit:
Replace
the
defective
components.
Does
not
operate
between
760
and
999.9875
MHz
•
Defective
Q113
and/or
VC02
circuit:
Replace
the
defective
components.
Ail
bands
do
not
operate
but
display
is
OK.
•
Defective
PLL
(IC101,
IC102,
IC1)
and/or
associated
circuit:
Replace
the
defective
components.
—
16
—
Symptom
Possible
Cause/Remedy
...
Searches
but
does
not
halt
on
the
correct
frequency.
•
Defective
IC303,
IC304,
IC305,
Q309,
Q310:
Replace.
•
Discriminator
coil
T301,
T302
are
out
of
adjustment:
Readjust
T301
and/or
T302.
•
Refer
to
"Reference
Frequency
Osc.
Alignment"
on
Page
11.
Does
not
make
peep
tone.
•
Defective
1C
1
and/or
associated
circuit:
Replace
the
defective
components.
Does
not
blink
nor
make
peep
tone
when
battery
voltage
has
gone
down.
'
Defective
ICS
and/or
associated
circuit:
Replace
the
defective
components.
—
17
—
PRINTED
CIRCUIT
BOARD
Bottom
View
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