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  9. Realistic PRO-2027 User manual

Realistic PRO-2027 User manual

I 7
~E4L'S'h~
•
ennce
PRO-2027
ProgrammabieScanner
Calalog Number: 20-402
CONTENTS
Specificaffons ,
BIOGk
Diagram _
Prlnclples of Oparation. ,
GeneralOperatlonOulline
...
AlignmenVAdjustment
Recsptlon
Check.
M"'moryCheck
,
....
Troubleshooting , . .
..
. .
Prlnted Circuit
Boards.
Wiring Diagram ,
Electrical Parta List
Mechanlcal Parts List.
..
ExplodedView ,
BemlconductorLead IderMication and IC Block Diagram
..
,
Microprooossor
(lee)
Port Format,
...
,
....
POW<lr
Transfcrrner Speclflcallons.
SchematicDiagram
..
_.
..
,
...
<lil
1992
Tandy
COI_allDo.
All
Rights
R
....
rvod.
Radio
sh""k
Md
"""'iotic.",
,.gi.l"-
tr.domarks u
...
d
by
Tandy
eer_a1lon.
Page
,
a
,
e
a
"
is
te
ra
za
as
"
"
"sa
se
ss
SPECIFICATIONS
Fraquancy Coverage VHF La
Aireraft
VHF Hi
UHF La
UHF Hl
30-54 MHz
108-136.975 MHz
137·174 MHz
380-512 MHz
808.0000-823,9375 MHz
851,0000-868.9375 MHz
896.0000-980.0000 MHz
5 kHz steps
25 kHz steps
5 kHz staps
12.5 kHz steps
12.5 kHz steps
12,5 kHz step"
12.5 kHz steps
Limit I
'.0
'.0
'0
I
'.0
'.0
,
ts
ro
±14
U,
"
so
eo
SansltMty
Squeleh Sensitivily
Selectivity
Spurious Rajaclion
IF Rejection
Modulation Acceptanee
Signailo
Noisa Ratio
Residual Norse
Scanning Spaad
Scan Dclay Time
VHF Lo
Aircraft
VHF Hi
UHF La
UHF Hi
at Ihreshold
at tight (Lo, Hi, UHF)
al tlghl (Airera!t)
-""
-50
dB
VHF La at 40 MHz
Aircrafl at 124 MHz
VHF Hi at 154 MHz
UHF Lo at
450
MHz
UHF Hi at 860 MHz
10.7 MHz at 154
MHl
(EIA RS-204-A)
VHF La at 40 MHz
Aircrafl at 124 MHL
VHF Hl
al
154 MHz
UHF La at 450 MHz
UHF Hl at 860 MHz
Vol, Min.
Faat Speed
Slow Speed
Un~
,N
'V
'V
'V
'V
'V
ca
"
'H,
OH,
dB
dB
ee
dB
'H,
dB
dB
ee
aa
ca
'V
cnanrcls/sec.
ohannels/sec.
'"'
Nomlnal
0.'
'.0
'0
"
'.0
t
as
ze
±10
:1"20
BO
BO
BO
Not speeified
Not specifiad
BO
"
"
as
"
as
as
3
as
a
z
"
is
so
as
so
as
es
,
22-28
,-0
,,
!
Any 100 cnanrere in any band combination
Liquid Crystal Display
Direct Key
êntry
Digilal-Conlrolled Synlhesizer, Superhal..rodyne
tet
IF: 10.7 MHz. 2nd IF: 455 kHz
Power Souree AC 120 volts, 60
Hl,
13 watts max.
Dimansions
71116"
9
718
x 2
318
inches (DWH) (180
,,250
x 60 mm)
Waight Approx. 53 oz. (1,5kg) without antanna
Not
.., Nominal specs
repra~ellt
tlle
design specs, All units should
b<l
able to approxlmata these-eecrne will exeeed
and scrne may drop slighlly below these specs.
Llm~
specs reprasent tha absoluta worst condltlon Ihat still might
ba consldcrcd accapl"bla; in no case should a unit lall to
meallimit
spccs.
Ohannels ol Operation
Channel, Frequeney,
and
Mod"
Display
Roceiving
Sy~jem
BLoeK
DIAGRAM
30-54~Z
1~4~;
I
SIlLEl.CH
I
lD8-13e,975~z
137-17~MHz
10.7MHz
LO~/AIRJ1{[/RF
~
IF
AMP,
I-
-,
OSC
MIXER
"1-
IF
AMP.
AG<:
CONT,
""
oe,
FILTER
1IIJ.llIAA
TURE.lIET
Glll2
IlO
rtllSE
A~.
Ic-
.,
'"
.co.7-64.71f1z
~ERAll!C
~SD-51_
.-
VC4l
(LOW)
,a",
U!F
leW
RF
/lIP. •
GS
G7
""
"""
...
3!l9.~1.3MHz
119.7-167
.IMHz
AM
If
AlF.
I
m'~
vee
(AIR/HI/
'R
lW
leW)
1l2.~
G25
."
es
Ql~
SOS-!I6OlfII.
816.7-970,7MHt
~e,
35-485.
35ItI!.
lil'
Hl
RF
IW.
an
IlOUIlLER
VC4l
(UHf
HII
alS
ais
Q17
".
GIS GIS
SWITC!IINB
ICJ
12/41
aa;
.~i
"""
""V"
t
•
-:
ZERIJIATlC
n
BAND
SIEl.EtT
~,
"'"'"
~-
•
reA
IC3(l/~1
~
G12-14
~:!~
~
"'
~IO
AMP,
""
L(
eu
027
IC?
,.
10-
~;;
eM~O~
'"
C-
l--
eu,
VOLTI.GE
'"
KEIIORY
REGLUTOR
""
ree
026
""
LDM-·PISS
FILTER
r
G21
Q22
I.-
PIlIll:R
SM
RECTlFIER
CPU
CONTRDL
""
~~
."
".
L
~
'roLT,l.GE
REGULATIlfI
".
I"'oc
--
CON\lERTER
KEYBOARD
lelO
-,-
l.
PRINCIPLES OF OPERATION
The PRO-2027 is a PLL (Phasa Locked Loop) syntheslzed VHFtIJHF, FM/AM race!ver, controlled by a CPU (Central
Processing Unit) via a keyboard.
•.
The VHF La band (30-54 MHz) or VHF Hl band (137-174 MHz) is raceived in 5 kHz lncrërnente and ths UHF La
band (380-512 MHz) or UHF Hl band (808--960 MHz) is set up
10
ee in 12.5 kHz inc'ements. Similarly, the alrcratt
band (108-136,975 MHz) ia in 25 kHz steps.
All funGlions, such as the receiving trecuency ranga, frequency determination, and scanning and delay time. are
çonlrolled by the CPU. The CPU is able 10do only the assigned fum:lions and no modificatlon ot th.. CPU is teaslble.
Tha followlng paragraphs explatn the operation of the circuit in terrne of the functional bloeks:
Varactor (vanable capacrt
...
nce diode) tuning ("automatic luning syslem") is employed on all bands.
Field-effect transistors (FET) are used inthe RFIMIX circuits of low and high bands to eenleve optimum mix-modulatlon
ano mutual-modulatlon characteristlcs. Q23 amplifies Ihe 10.7 MHz IF. A 10.7 MHz monolithic ervetal tilier is
incorporated to oblain
11
good
lf
selE>ctivity.
IC2 contains Ihe locai oscillator, mixer, IF amplifier. quadralure FM detector, and noise ampmier. A crystel oscutator
produces 10.245 MHz which is mixed wrth 10.7 MHz, resuiling in 455 kHz IF. A 455 kHz ceramic filter i8 provided
la lncrease the IF selectlvlty. The 455 kHz IF signal is ampiified in tha IF amp stage. and Ihe quadreture FM oetector
deteets it as an audio signal.
The detected output of Ihe FM is applied
10
iC7. IC7 amplifies the audio slqnals and drives Ihe speaker.
IC6 is Ihe
cpu.
which does data processing and calculation. Any unstebla supply voltage (VDD) to tha CPU een
eause CPU maltunetlens. such as wrong data processing and wrong data transfer. To overcome Ihis,
C17l
and
R150 in the logle circuil "Initialize" Ihe CPU. (Refer
10
Ihe schemalic diagram on Page 55)
The inltlalizalion is done as soon as power is connected. Figure A
shcw"
the initielizlng waveform. The memory
backup
tunencri
is aulomatlcaily siaried whenever the initiallzation has been ccne.
t-j
The RESET switch is
IOCllted
In the hole on tho back of the unit end is used
10
correct an LCD or keyboard
maifunction. Initiel;zallon of Ihe CPU, as mentioned ecove, can
...
Iso be
don"
by pushing RESET.
Key input and recalvlng trequ"ncy are managed by thc CPU, and Ihe CPU outpul drives the LCD.
CX1 (8 MHz) is a ceramic osoillator which is used
lor
CPU control. Figure B shows 1/8 divtded of Ihe waveterm of
Figure C.
-,-
ICB
PlnCi.)
,
,
,
'320
:-
'i
rn,,,,,,
I
Se,el
<wit"'
rei."."
Figure A
o
,-
I
I
-
,I
,
,
,.,
,I
~'"C
,
•,
,
5,OV
Fiqura
B
IC6Pin@
'l'
O.2V
--
IC I
VOoo
4.4V
FigureC
'n
._:
---..l
-----
GENERAL OPERATION OUTLINE
Turn
on!h.
""".,
SW,
A\Jtomatically
"êIS In
SCAN
rood.
and
.ton
••
""nnin9
woon
1I1A
sa
is on.
p,_
tI>e
reoot
&wil<:h,
Ioi:atod on
til.
bacI<
oftl1e ..,,,,,nor.
Soan Ban
..
1througn 10 are
di.pla~ed.
II
tIlere Is any
clanl<
""""
bank.
P""'"
the
numb
...
key
T~'1ar!
dl""" """reh,
P"'''
[A] or
['1'].
10
light
all OCQO
bo.nI<$.
aT>d
to blink on& ot !hom in
on.
i'lo ,,,"CliO" wh""
"'"
hequency is
ooo,oooa.
aftllr 3Mlher,
PreOS
KeY6
[11
Ihr<lugh
[91.
Pre""
[MANUAI.].
Soan 8!11lk. 1 tl1rou\jh 9
";11
disappear
Th I>old!he
<:hannOl.
pr=
[DELAY]
(Woon
Ihi.
ohonn"
IPl
•••
[0]. No responsa.
I.
not oe! 10
Delay.)
I
To
rel_s
til.
<loIBY
funetiOol,
pro'" [DELAYj
_in,
I
Pr
...
Koy. [l]Ih'OllIlh (9]
Md
[01-
Scan
!lan"
1
1tJro"~h
9are
di$p1ElY"'d,
bLn
00110.
To
slOp
a""""In
fr!lquom:y,
pMS
[LOCK
OUTI
(""'"'
thls on""",,1 I. not
.et
10 l.ock
oUl).
To ootaln
pOority
"""",IIon in
"".n
mode. press [PRIOR-
rrn.
Th
_In
p1ioril)i
operation in manual
mod
•• pre
..
{PRI-
ORITY].
To rei
....
&tho ptio,jl)l functicn,
P"'""
[PFlIOO1TY]
_in,
Torel",,"" the p!lcrtly funclion, pre
..
[PRIORITY] again.
P
.....
[MANUALj.
When
\MANUAL]I.
p""
••
d agBin.
Ih.
channal
ad.""",,".
T"
..
,.ct
ona ol 1
II1rO<l\lh
100
eh",,·
nal.,
pr."
tha
numb.r
I<ey
and
then
ra""
(MANUAL].
Pr
...
{PROGRAM] to
.ot
to program moOB.
-"-
.,
.,
1---..
AI
.,
.,
I
Enlef !ha d
••
iled frequ"""y in
8IOCh
"""nnel
..
falloW!!:
Ent.,
•••
reII ksquoncy
..
toli""""
Enter th& d
••
lr.e
f""lLJBncy wlll1
numor~1
''''''"
P'."
[LIMIT]Md
ent.'
In$
I""""
!r<>quenoy
cl
,',,'
range
to
....
eh with numeTill
""1".
Pr
...
[ENTER) to momcrlZ!l
th.
fioquoncy. Rwrong !re.
quancy
(OUloftIl.
bOlld)
10
am.red.
·Er",~
"ill
b.. di.-
PM"
[ENTER].
pi_Vod.
P,
...
[ClEAR].
\!1en
anter
the
correoot
frequanoy.
Pr
....
[LIMIT]
ond
anter
lI1e
uPP'"
r,equeflC\l
of
lI1e
rar>ge
Pr
...
[PROGRAMj
IQ
edvanc&to
th.
n.xl
_nnel.
ErTl., to
""arm.
tI1e
freqLJMOy and pre""
(ENTER).
Rep
••
tII to momorlz..
Ir.qu"""l~.
nn~
hy OM
P
....
[ENTER]
PresoIPRIORITYj.o \he priorily ohannelapl"*'rs.
Tc
nwoM
jo
lI1e
prGViou.
OMnnel,
pre""
[PFiIORITY]
agaln.
Pres; [A)
10
"""reh trom
10_
frequeney.
Pte'"
['1'1
to
gearoh trom
uwor
kOqU8OCY
(sqLJ8lch
must be on).
Tc
..
loci.
chMn",
.nleT"
n"mbo,
(1 tlirough
HlO)
or<!
ttlèn pres. [PRIORITY].
Priori!)'
chon"~1
"';11
00
ctlanl/OO
jo • nowly ..mored
"""nnol.
P,
....
[MONITOR)
IC
Slor.
Ih.
d
••
iroo
k.q""""y
(10
monllo,
ohannel_)
Intha so.roh
rno<:!
•.
To
0011
roonltor
cl,onn"',
1'<0"
[I~ONITORI.
Th"M
"".rc~,
n'.""
("1
or
["1·
Pr
...
[MONITOR)
""
Ihe nexl monitor
_nnel
.pp.""'.
Th
oalltha monitordlennels
dirgçlly.
pre
••
numeral
I<ey
•.
Tc ,ovort to
th.
previeu. ch,,"nel. P"""
[PROGRAMI.
ALlGNMENT/ADJUSTMENT
Alignment and Test Point Locations
TP6
~
rrs
TIO a
I::IEB
o
OTI2
OTII
TP2 TP3
Alignment Preparation
Test
equipment
required:
1. Oscilloscope (0-500 kHz,
0-50
MHz)
2.
ACSSVM
3.
DCSSVM
4. Frequency counter (200 MHz)
5. Slow sweep generator with variabie marker (10.7
MHz)
6. 8-ohm dummy load
7. VHF sweep generator with variabie marker (30-54
MHz, 108-174MHz)
8. UHF sweep generator with variabie marker (380-
512 MHz)
9. FM signal generator (30-54 MHz, 137-174 MHz,
~
380-512 MHz, 806-960 MHz)
10. AM signal generator (108-136.975 MHz)
Channel Frequency (MHz) Channel Frequency (MHz)
130.0000 9174.0000
241.0050 10 380.0000
354.0000 11 451.0000
.4108.1000 12 512.0000
5121.0000 13 806.0000
6136.9750 14 908.0875
7137.0000 15 960.0000
8155.0000
Table 1
Notes:
• Use non-metallic tuning tools.
• The test equipment and receiver should be warmed up
lor
at least 10 minutes belore proceeding with alignment,
• The signal
levellrom
the generator should be kept as low as possible to obtain an usabie output.
• The memory backup circuit can hoid the programmed channel memories
lor
about one hour, or until the power
is provided (within one hour).
Program Channel 1 to Channel 15 as lollows:
-8-
l
.......
......
ALlGNMENT PROCEDURES
Reference Frequency
OSC
Alignment
Step Control Setting Test Instrument Connection Adjust Remarks
1OFFNOLUME control: ON. Connect frequency counter to TC5 Adjust TC5 so the frequency
SQUELCH control: TP3 and GND. is 118.800000 MHz ±10 Hz.
Fully countèrclockwise See Figure 1.
(CCW).
Select Channel 4.
IF Section AJignment
Step Control Setting Test Instrument Connection Adjust Remarks
2OFFNOLUME control: ON. Connect test instruments as Tg Adjust Tg for maximum RF
SQUELCH control: CCW. shown in Fig. 2. T10 waveform and adjust T10 to
make the left and the right of
the S curve symmetrical.
Note: During alignment, maintain the sweep generator output at the lowest level to prevent overloading.
TP3
Unit Frequency
Under Test J
Counter
,-----'TP6
Unit
Under Test
10.7MHz
Oscilloscope
Step Contral Setting Test Instrument Connection Adjust Remarks
3OFFNOLUME control: ON. Connect DC SSVM to TP5 TC2 1) Select Channel 3 and adjust
SQUELCH control: CCW. and GND. T7 TC2 for 13 volts on the DC
Select Channels 1 through 3. See Figure 3. SSVM.
2) Select Channel 1 and adjust
T7 for 1.0 volt on the DC
SSVM.
3) Repeat Steps 1) and 2) until
no further improvement is
observed. See Table 2.
-
CH
Frequency
Voltage
eH1 30 MHz Voltage at TPS 0.9-1.1 volts
Table 2 CH2 41.005 MHz Voltage at TPS 4.Q-S.3 volts
eH3 54 MHz Voltage at TPS 12.9-13.1 volts
VCO Alignment
VHF Lo Band
Figure 1
-9-
0.01
J.!F
Sweep Generotor
Figure 2
DeSSVM
TPS
Unit
Under
Test
Figure 3
VHF Hi Aircraft, and UHF Lo Bands
Step Control Setting Test Instrument Connection Adjust Remarks
4
OFFNOLUME
control: ON. Connect DC SSVM
ro
TP5
TC3 1) Select Channel 12 and ad-
SQUELCH control. CCW. and GND. TB just TC3
lor
12.0 volts on
Select Channels 4thraugh See Figure 3. the DC SSVM.
12. 2) Select Channel 4and adjust
TB
lor
1.0 volt on the DC
SSVM.
3) Repeat Steps 1) and 2) until
no improvement is ob-
served. See Table 3.
Table 3
UHF Hi Band
CH
Frequency
Voltage
CH4 108.100 MHz Voltage at TP5 0.9-1.1 volts
CH5 121.000 MHz Voltage at TP5 2.5'-3.5 volts
CH6 136.975 MHz Voltage at TP5 5.5-{;.5 volts
CH7 137.000 MHz Voltage at TP5 1.5--2.5volts
CH8 155.000 MHz Voltage at TP5 5.0-;;.5 volts
CH9 174.000 MHz Voltage at TP5 10.0--11.5volts
CH10 380.000 MHz Voltage at TP5 1.5--2.5 volts
CH11 451.000 MHz Voltage at TP5 5,5-{;.5 volts
CH12 512.000 MHz Voltage at TP5 11.9-12.1 volts
Step Control Setting
Test
Instrument Connection Adjust Remarks
5
OFFNOLUME
controt. ON. Connect DC SSVM to
TP5
and L13 Adjust L13
lor
11.0 volts on
SQUELCH control: CCW. GND. the DC SSVM. See Table 4.
Select Channel 15. See Figure 3.
Table 4
CH
Frequency
Voltage
CH13 806.000 MHz Voltage at TP5 4.5-5.5 volts
CH14 908.0875 MHz Voltage at TP5 8.5-9.5 volts
CH15 960.0000 MHz Voltage at TP5
10.9--11.1
volts Figure 4r
use
_
non-metallic
Coil
tuning
tooI
PI:::IE,
!lIIIIiIUIII
Note: Be very carelul when doing internal alignment
ol
Coil L13 as shown in Figure 4 because it may affect
Irequency greatly.
Secure the coü with glue atter alignment and then repeat Step 5 above after checking that the coil is secure and
the temperature is normat.
-10-
•RF Amp. Alignment
VHF La Band
Step Contral S..tting Tesllnstrumenls Connection Adjust rtemarke
,
eIOFFNOLUME wntrol: ON. Connac! lnatrumente shown
rr
1) Select
CMnnel
2 end adjust
SQUELCH controt
Gew.
es in Figure 5. T>
Tl
end T2 for maximum RF
Select Channels 1through 3. Sweep generator wave/arm.
See
Tabla 1. 3Q.-54 MH2. 2) Check Channals 1 through
310r
maximum
output.
A slight deviation as shown
in Figure 6 is acceptaole.
VHF AIR Band
~'P
Control Setting Test Instrumenta Connect'lon Adjust Remarks
rOFFNOLUME control; ON. Samtl as stee 6. ra 1) Sollee! CMnn,,1 5 end adjust
SQUELCH controt CCW. Sweep generator rs T3 end T5 for maximum RF
Select Cttannels 4 through 6. 108.1-13tl.975 MHz. output.
Se"
Tabla 1, 2) Check channels 4 through
6
lor
maximum RF output.
A slight daviation as shown
in Figure 7 is acceptebts.
VHF Hl Band
Stap controt Sallin I
Tesllnstrumenl
Ad·ust gernarks
-
e
OFFNOLUME
centrot ON.
seme
connection as Step 6. ra 1) Setect Channet 7 and adjusl
SQUELCH eer-trof: CCW. Swaap generator re T4 and T6 for maximum RF
Setect Channats 7 through 9. 137-174 MHz. wavaform.
,
Se"
Tabta 1. 2) Check Channllis 7Ihrough
,9 tor maximum RF cutput.
Asllght d,wlation as shown
in Figura e is arx::eptable.
UHF
Lo Band
Siep
Control Setting. Tast tnstrument
A_dj~_sl
,Remarks
0
OFFNOLUME
centrot ON. Same connection as Step 6.
,C'
; 1) Setect Channat 10 and ad-
SQUELCH centrot CCW. Sweep generator
,C'
just
TCl
and TC4 tor maxi-
Setect Channals 10
thrClugh
380---ó12
MHz. mum RF output.
I12, Sas
Tabi"
1. 2) Check enennets 10 thraugh
12 for maximum RF
output
A sf,ght
oevencn
as shown
Iin Figure 9 Is acooptable.
UHF Hl Band: No adlustment raquired.
~11_
Ant.
Jac~
UnTP1!2
Oscillascape
o
"'
I
Ji
Undar
Tast
r..
[l\]
V H
r-'
Sweep il'"
'.
,.
Generator
Nates:
• Us'"
TPl
lor
VHF
t.o.
Aircratt, ano VHF Hi
band adlustrnents.
• uee TP2
lor
UHF La band adjuetment.
Figura 5
0
~
,,,
1+=[\
~
~,
ti
Af
!
1,
/i\
/1'"
",
".
n,
00
".(105
..
,,,"
'''",'
'"''
,,,,",I
Figu'"
6Figure 8
HA
IE
irt
71\
A
f\[
"'.100
",.(10
"
•.•
"
...
."
.n
.,..
''''H>l
'g.'M".l
Figure 7Figuro 9
Overall Alignment and Sensit;v;ty Measurement
Step
ro
Control Setting
OFFNOLUME
centroe
ON.
SaUELCH
control: CCW.
Selecl Channel 5.
Test Instrument Conneclion
,Adjuet
Short-circuit the reslstor R301 I
(270 ohm, 112W) on lhe head·
phone
PCB
wlth ajumpar wlre
as shown in Flgure 10
llnd
I
conneetthe AM signal gener·
ator to the
ANT
jack and tne I
AC
SSVM
10
Ihe
headphone
jack
BCroSS
sn 8-ohm dummy
lasd as shown in Figure 12.' "
Ju",,"'
w",
Remarks
1
1)
AdjUS!
T9
and
T11
lor
maxi-
mum cutput at
ue
SiN ratio
20 dB.
1
2) Adjust T12 tor minimum
THD.
I,
Figure 10
_12_
•Ant.
Jack
Headphone
Jack
Unit
,.
Unde.
Test
oscurosccp
.,
[û]
a•
-F"
Ohm~
•
,.
Slqnc!
Generator
AnL
Ter
minClI
Heodphone
Jack
--
Unit
,.
Under
Test
-a
Oscilloscop
[û]
a•
-
'"
Ohml-t-
•
,.
Signa!
Cenerator
Flqura 11
Ncte:
TP7 is used 10ceserve the AM band detector output.
Figure 12
S"
Control Setting
Test
Instrum.ml Conn5GIion Ramarks
t t
OFFNOLUME
eentrot ON Danneel the FM signal generator
la
Turn off the rnoëutaton
oe'
SQUELCH contral: OCW Ihe ANT jack' and the AC SSVM IQ measure the (S+N)fN ratio.
Channal as Tabla 1, the headphone
ja.ck
across an
Bohm
dummy
load.
see
Figures 10 ene 11.
Set
thë slgnal generator la ..ach tre-
quency as shaWl! in Table 1.
Sat
ue
Volume
control for 0 dB (0.775
V) reading on the SSVM.
Zeromatlc
Functlon
Test
Procedure
,(, 8r
S+
IC4(1/2)
oz
~2
R140 , ,
2
180k
, ,
<3 •
'+
IC4(1/2)
Ir
41
e,
rr
(
«is:
V-
'rJi~"rirT1in<ltorcurve
(Zeromatic tunetrens when
OUTPUT
Is low (L).
0<e1<""
63<e1<e2 B2"'el<Vcc
OUTPUT
(027
Calhode) HLH
To adjust the e1 voltage, rncaive a signet in the menuel mode, and set
Tl0
10 oblaln 2.0 V al TP6. II is convement
10 uee the Natjonal Waather Service Signat for the adjustment.
1IZeromatic dOlls not function
wrrectly,
rerer to the
Refe,,,mce
Frequern;y
ase
Alignment (Page 9), check 118.800000
MHz±10Hz, end adjust T10 agein 102.0 VDC whil.. a signal is ba;ng """",ived.
-13-
RECEPTION CHECK
»>
...-D~
"
-< d
..
pa\, prop", ,J
'"
I.th"
recti~"r
diode
(D~9)
_---tÎÓa<s
0<'
'0
J
-fimcllon
""d
,."',,
who~
8Q
isDN?
Is
the
vol'age rogulolor
YES
{IC9.D25) OK?
~
"I
<;
kèy-entry
wor!<
~"
'"
tIIe
Ica
oloek
""oill.~QIl
wl>'lefonn or reset OK?
'"
~'"
I
theunit
produoe
nol
••
whon volume
oon~ol
'0
I,
lhe
epu
oootrol "l",uIt
1.1""'0<1 olook,,;se? (SQ' I.
0"
lIJmoo ""LJnterclock_ J
wi
••
)I
1&
lCDOK? I
ves I
I.
'e<."P~Oo
I.
t11. IF amp orooi
••
OK when
"'~"'"
"
Iroqueoci
••
Elf.
amp
olrouil
{I(2)
OK?
er1lel.d? j
'" I1,ICeOK1 I
~
<
"'0
memo,,! tunolioo "0
orkOK? I, !he
DÇ-DC
OOtlvMor J
T
YES
(which<"".I.1s
ollCl01
~,
I~
til.
kiI'Jboard oOOlor
I I I
...
"""iatod
circu~"
OK?
ENe
Is
!h.
volla\lo rcgul310r J
oi
reuit
(""'ICh
""""isls
ot I
leB) OK1 Is
IC{;
"",et
pmperl,7
JI
Is
lhe
boc'up
""PBoilor Is
tho
band .eklc1lon J
{C1J6)
OK?
ei
reuit
(wNOh
""""jst5
ol
Q'2,13"nd14)OK?
~
IC~aOOb<
...
"",,;etoo
JI
circUits
OK?
Is
U'O
epu
oontrtJl
cico"~
IS
!ho PLL
circu~
(whlch J
(whioh
consi""
ot a2a, OOM;'" of IC1,Cl21,
a,>d
D30)
OK?
aa)
OK'
I,
ttw lnule circuit 1027
..,d'or
I I lC3) OKI
I.
!he pOwer
.upply
circuit
I.
!he VCO
olreurt
(whloh I
(wl1ich
ccnsist; of
tea.
OOnsist<
ofQ6, 7, 9, 10,
D~B)
OK?
1B,and19)OK?
I.
til.
audIoamp (Q27,
'On
OK'
_14_
---------_
...
MEMORY CHECK
•
•
POWER ON,
Ent"" (program)
150,OOClnCH1.
Power switch DFF.
Power
sw~ch
ON.
Power switch OFF end unplug
the power rord. After 1 hour,
plug it in again.
Power switch ON.
MEMORY
clrcultts
OK
.
Notes:
• Prior
10
chscking thë CPU system,
measur.. the 6upply vottage to the ICs.
(See schematic diagram.)
• While checklng Ihe lollowillg items, Ihe
les
can "Iatch up,· II so. push the RE·
SET switch
lor
about one secene ene
then continue.
8e
sure thaI the extcmat
power is
presenten
lhls check.
NO
NO Defective CPU control circuit,
028,
,md/or D30.
NO Detective backup capacitor
(C136).
i5
--
I
TROUBLESHOOTING ,
8ymptom CauselRamedy
--
Display does not light and there is na sound ;Defective power oord, Bëplace.
when POWER is on. aDefective DN-OFF switch on volume control: Replaca
Volume contral: MAX.
Squelch control counterclockwlse (CCW). 1. Detective spaaker : Replace Ine detective parts. -
Display lighls Dut Ihe,e is na sound
Volume
controt
MAX. aDetective audio. ampüner IC7 IIndior a5socjeted circuit
GOm-
Squelch control: CCW. ponants: Replaal! Ihe oerectfve oomponems.
aDeîectlvë IF amplifier IC2 end'or assoclaled circuit cornpo-
nents: Replace me defectivIl ccmponents.
,Detective functional squelch control and/or assaclated circuit
romponenls: Replaoe Ihe
def~live
comconeots.
sOe/active Q27. IC3, andlor associa.t..d clrcun: Replace Ihe
delective components.
Sound comës out but display does not light. t. Detective LCD: Repiace the detective components.
Volume conira!: MAX.
squelcn
contral:
cew.
zDeiecllve
leB
a"dlor
assccietec circuit: Replace the detective
romponents.
Does not scan and squalch
does
nol
op..
",te.
;Detective
le2
and/or assoclated circuit components: Replace
the delecHve components.
aoerccove ICB and/or aS60ciated clrcutt components: Replace
the oetecnve components.
Does net scan
bul
squelch operetes. OelecHve IC6 and/or assoclated circuit oornponents: Replace
the delective componen15_
--
Displays incorrectly and/or unable 10 enter tneteettee keyboard and/or assoctaled circuit:
aecece
the
correclly wnsn
RESET
switch is pushed detective componanls.
2. Delective CPU (tCB) and/or associated circuit: Raplace
Ihe
I--c-
detective oompcnents.
Displays correctly at Ihe tIme ct pragremmtng, Detective CPU
(le6)
,md/or assocläted circuit: Replace lhe
but
alter
scanning, il t>ecomes taulty, oerecnve components. _
MANUAL select operetes, but SCAN does
not
Squelch control is not adjusted correctly: Turn squelch control
operate. clcckwtse. -
IAll bands do
not
operate, but display is OK. ;DetectiveQ21 end Q22 in low-passfilter: Reptacethe defeclive
components.
aDetective
tel
and/m assoclated
circuit
Beplace the detective
componanls.
3Detective tCe voltage regulator
aneVor
tCl0
DG-OC convel1er
circuit: Replace the oetecnve componants_
-16-
...
Symptom Causa/Remad
VHF Lo (Mid) band does not opecate. but Aircraft,
t.
Detective
Dl,
02, T1, T2 tuning circuit andJor
06,
07
VCO
VHF Hl, UHF Lo, and UHF Hi bands operate. circuit Rëplace thc detective components.
aDe/ectlve
014
and/or esseetatee circuit: Reptace the detective
components.
Aircralt band does not operate. but VHF Lo, VHF tnetecnve
08.
T3, T5, and/or essodeted drcult: Replace the
Hi, UHF
to.
and UHF Hl bands eperats. oetectfve components.
,Defective AM IF Amp., including
024
and
025:
Replace fhe
detective components.
aDefective
014
in band switch circuit: Replace the cetecnve
cemponem\$.
---- -
______
0_- ----
VHF Hi band does not eperere out VHF Lo. Air- 1. oetecnve
03,
09, T4, T6, end/or aesocieteo circuit: Raplace
cratt, UHF Lo, and UHF Hl bands eperato. the defective components.
2_
Detective
013
in band switch circuit: Replace the defective
cemponen\8.
UHF Lo band does net Opefale, but VHF Lo, 1. Detective
04, 05.
and/or assocteted circuit: Replace
ue
de-
Alrcratt, VHF Hl, end UHF Hl bands cpcrate. feoflve components.
,Deteofive Q12 in band switch circuit: Replaoe the defeotive
componenls.
...
UHF Hi band does not operate, but VHF Lo, tDetective
015-17,
020,
,mdlor eeecceiee circuit: Replace
Alrcratt, VHF Hl, and UHF Lo bands cperate. the detective corroonents.
2. oerecnve
018,
019
vea
circuit:
neeace
the defeotive cem-
ponents.
3. Deleclive
012
end/or assodated circuit: Replace fhe de/eotlve
components.
"Zeromatic" does notoperale or holds on a drifted 1. Defective IC3. IC4. and
027
In Zeromalic circuit Raplaca tha
fraquancy during Baareh operalion. dalective componenta.
,Diacriminator coil is out ol edjustment: TP6 sren have ap-
proximately
2_0
V in normal receiving mode. Raler to "ReI-
erenee Frequency
oac
Alignmenl" on Page 9.
Nole:
Puises generat6'Ó while checking circuits and/or certain combinations
ol
kay eperation may eaus.. ;mproper eoerenen.
To clear mejtuncücns, rë-Inltlallza tne
epu:
Push Ihe RESET switoh while pressing CLEAR, and thën release the
RESET switch. All ehannela (100 eh) will be
cesree
and the trequency Ind[oator displays 000.0000. (Be sure tha
power is on while
ra-initiali~ing
the
epu.)
--17-
PRINTED CIRCUIT BOARDS
HEADPHONE
JACK
PCB
(Top View)
o
J2
~
(Top View)
(Top View)
ORED Ir-
',"
;.
1
OWHT
~
OGND VRI
(Bottom
View)
VOLUME PCB
(Bottom
View)
SQUELCH PCB
(Bottom
View)
i :REDO
IT!
ti
WHTO
I
l.4-I1
L.J GNOO
VRI
- 18 -
- 19 -
-2

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