Tandy Radio Shack Realistic PRO-200G User manual

Catalog Number:20-145/9145
PRO-200G
Programmabie Scanner
----
-en
Ir,..
;..
0Jj(O
-~E:ALIShc®
•

CONTENTS
Page
Specifications 3
Block Diagram 5
Principles
of Operatien 6
General Operation Outline 7
Alignment .............................................
.. 9
Reception Check .
... __ __ .19
Memory Check 20
Troubleshooting
21
Linear PCB (Top and Bottom Views) 24
PLL PCB (Top and Bottom Views) 26
Logic &Display
PCB (Top and Bottom Views) 28
Keyboard PCB, Headphone
Jack PCB (Top and Bottom Views) " 30
Wiring Diagram
31
Electrical Pans List ,......................................... .. 32
DisassemblyIExploded View , , 58
Exploded View Parts List 59
Semiconductor Lead Identification and IC Circuit Diagram , .. 60
Microprocessor (IC-501) Pin Allocation
.. "., , 71
Appendix. , . , , . , . , , . , , . . . . . . . . . . . . . . . . . . . . . . . . . .. 73
Schematic Diagram ............................................................
.. 75
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in th is chassis have special cnaracterisncs. These
characteristics often pass unnoticed and
the protection afforded by them cannot necessarily
be obtained by using replacement
components rated for higher voltage, etc. Replacement
parts that have these special safety characteristics are identified in
th is manual and its
supplements; electrical components having
such features are identified by a .r" in the schematic
diagram and the parts list.
Before replaclng
any of these components, read the palts list in this rnanual carefully. The use
of substitute replacement palts that do not have the same safety characteristics as specifled in
the palts list may create shock, fire or other hazards.
-2-

Frequency Range
SPECIFICATIONS
25.000 MHz-520.000 MHz
760.000 MHz-823.945 MHz
851.000
MHz-868.945 MHz
896.000 MHz
-1300.000 MHz
UNIT NOMINAL
LIMIT
Sensitivity NFM: (8 + N)/N =20
dB
25 MHz-520 MHz
I'V
0.5 2
DEV.: 3 kHz
at 1 kHz
760 MHz -11 00 MHz
I'V
0.5 2
1100
MHz-1300 MHz
fiV
3 10
AM: (8 + N)/N =
20 dB
25 MHz-520 MHz fiV
25
MOD.: 60% at 1 kH 760
MHz-1100 MHz
I'V
25
1100
MHz-1300 MHz fiV
5 20
WFM:
(8+N)/N =30 dB
25 MHz-520 MHz
I'V
310
DEV.: 22.5 kHz
at 1kHz 760
MHz-l100 MHz
I'V
3 10
1100
MHz-1300 MHz
fiV
10 25
8quelch Sensitivity NFM andAM
Threshold 25
MHz~520 MHz ftV 0.5 2
760
MHz-1100 MHz
fiV
0.5 2
1100
MHz-1300 MHz fiV
310
Tight:
(S +N)/N 25
MHz-520 MHz dB 25 15
760
MHz-1100 MHz dB 25 15
1100
MHz-1300 MHz dB 20 10
WFM
Threshold
25 MHz-520 MHz
fiV
3 10
760
MHz-1100 MHz fiV
3 10
1100
MHz-1300 MHz
I'V
15 30
Tight:
(S +N)/N
25 MHZ-520 MHz dB 40 30
760 MHz-1100 Mhz dB 40 30
1100
MHz-1300 MHz dB 40 30
Selectivity NFM and AM:
-e dB
kHz :!: 9:!:12
-50 dB kHz :!:15 :!:18
WFM
-s dB
kHz + 150 :!: 200
-50 dB
kHz
+300
:!: 400
8purious Rejection
at 328 MHz (NFM) dB 40 35
•
If Rejection
Modulation
Acceptanee
610 MHz at 70
MHz (NFM)
608 MHz at 1000
MHz (NFM)
EIA RS204A
-3-
dB
dB
kHz
60
60
:!:8
40
40
:!:5

25 MHz-520 MHz
760 MHz-ll00 MHz
1100 MHz-1300 MHz
UNIT NOMINAL
dB 40
dB 40
dB 35
,
25 MHz-520 MHz
760 MH-ll00 MHz
1100 MHz-13DD MHz
Signal
to Noise Ratio NFM and AM
DEV.: 3 kHz at 1 kHz
MOD.: 60% at 1 kHz
INPUT: 100/1V
WFM
DEV.: 22.5 kHz all kHz
INPUT: 100
ft V
Residual Noise (Vol. Min.)
Scanning Speed Slow
Fast
Scan delay time
Audio Output Power T.H.D. 10%
Channels of Operation Any 400 channels in any band combination
dB
dB
dB
mV
channels/sec
channels/sec
sec
watts
45
45
45
3
13
26
2
1.3
LIMIT
30
30
25
35
35
35
5
12-14
2428
1.5-2.5
1.0
Channels, Frequency
and Mode display Liquid crystal display
Receiving System Direct Key entry Digital-Controlled Synthesizer, Superheterodyne
1st IF (607.505- 611.5 MHz) Upper side 1st local frequency
2nd IF (48.5 MHz) Lower side 2nd local lrequency
3rd IF (10,7 MHz) 10rWide
FM mode
Lower side ard local lrequency
3rd IF (455 MHz) lor Narrow FM and AM mode
Lower side 3rd local frequency
Power Souree AC 120 V, 60 Hz, 18W
DC 13.8
V, 10W
Jacks Headphone, External speaker, Tape outputand "BNC" type antenna connector
Note: Nominal specs represent the design specs.
All units should be able 10 approximate these - some will ex-
ceed and some may drop slightly belowthese specs. Limit specs represent the absolute worst condition that still
might be considered acceptable. In no case should a unitfail
to meet limit specs.
-4-

. • AGC lII'. I.
NeISE ANP.
61'
I..-FoMl MlJte
r>l SNITCHING
ICtO.63'
3rd "IXER
611
I' I '37. BH!:" :::IIZ:-'-ii:'
X'TAL esc
XI.6tD
607.505NH,-511.5MHz
H ISI: AOPt-;=
1
-----'11
,H ,Lew-BATT OET 1'"-----1
IC511!.) ,.
f--535NHZ-113DMHZ.1358NHz-I90BNH,
. BUfFER ew PASS FILTE
-- ANP.
6301 6303.30'
I , 30V
I ~
11
•
•
~
~
9V BA11.
05B
VABOII",
I S~ElCHI
(OCI3.BVI
(TAPE CUÏ)
o
[HEADPHlJIE!
I0
[EX]. S:f'i<R I
D
[SPUKEiifJ,
~~lSer
059
AECTIFIERl
050 r
VOLTAGE
~
L.r SNITCHING
IC6.039-42
Cl'\J CONTROl] •
929-31.055 r
5V I VOlTAGE II
.-------l "'6~~TOR. -;I •• --,I_.:....~c
'-5I<Hz
---.
.LJ:tH .... 1 AM IF AMP.
..... NeIS! DEl.
'UD OET. 611.13.033
v
SNITCHING
1:1215-28
NF" "'. A.
~
OC-DC
LJ
CO NV ERTER
~2-4. 25
05 .
I.
4B. 5Iitlz 0~5~__ 1'"' _...J~O:
A"!"'" F ,.e
~ 1nd IF ANP.t-~
615.15 ~ •.•
45.0&, Cl
T
SNITCHING r
,1IC311l') .
Ipc-~
5" Bnd BIf
~
1---" 5,l,d
f!-
OOIVER
1~503
rj
I ... .-U
I I >1 ..... rC303
_____ lil. I---I-J
.....,.1 6317.3 .. 1B .......
~ -i-----::.:- :::....:-=-==--=.r~ -~"
B .I I X'l~~rC
Ipc-4
11
Cl
KEV BOARD T
cx!lB
lI
I
t1lttz
1 I I
5V
EL.DRIVER
T501.Q50B
,
IUNO 561
5"501
/
559.005
MH,
-563MHz
..
CONT~(ilLER
IC50.
OISPLAV
LCOSOL EL50 1
I
Ol
I

PRINCIPLES OF OPERATION
The PRO-2oo6 is a Phase Locked Loop (PLL) synthesized VHF/UHF, AM/FM receiver controlied bya Central Pro-
cessing Unn (CPU) via akeyboard.
Receiving
mode and search step are initially set to correspond with the Irequencies entered. When a Irequency
within
FM broadcast band is keyed in, receiving mode is set to wideband FM (WFM). When afrequency in active
radio
band, police, fire, ham radio etc.is keyed in, the mode is set to narrowband FM (NFM), and when a Ire-
quency in aircraft
and CB band is keyed in, it sets to AM mode. Also the mode and step can be changed by
MODE, STEP Keys.
The CPU (IC501) controls receiving Irequency range, Irequency determination, scanning speed and delay time
etc. The CPU is able to do only the assigned lunctions, and no modification of the CPU is feasible.
The lollowing paragraphs explain the operation of the circuit interms ol the functional blocks:
RF input circuit comprises 10 dB attenuator and band pass filter. Asignal generated by VCOl or VC02 is applied
to double
balanced mixer (D.B.M.) via lew-pass or high-pass lilter and mixed with the RF slgnal. The D.B.M. is em-
ployed to lacilnates 25 MHz to 1300 MHz mixing.
The lst IF (06) is 607.505 MHz to 611.500 MHz, and the signal is mixed with VC03 Irequency at the 2nd mixer
(07) to produce
48.5 MHz signal, which is applied to WFM IF (09) or AM/NFM IF (015,016). Corresponding with
input from
the keyboard, CPU determines which of VCOl or VC02 WFM IF, AM/NFM, AM IF, Data ol PLL circuit
to belunetioned. and outputs the necessary data.
Asignal entered to AM/NFM IF is mixed with X'tal oscillation frequency 48.045 MHz at the 3rd mixer (IC2) and
converted to 455 kHz signa!. Asignal entered to WFM IF is mixed with X'tal oscillation frequency 37.8 MHz at the
3rd mixer (011) and converted to 10.7 MHz signa!. The signals are lurther amplilied and detected to AF siqnal.
AF signals of WFM, AM and NFM are CPU controlled and applied to AF power amplifier (IC7) via switching circuit.
Squelch
signal is comprised ol noise product lrom WFM/NFM detector output, and amplilied by IC2 to switching
signal, which controls
AF mute and CPU.
Any unstable supply voltage to the CPU can produce CPU mal-Iunctions, such as wrong data processing, wrong
data transfer,
etc. To overcome this, CS08 and R517 "innialize" the CPU. Initialization is done when RESTART
switch is pushed. Figure A shows initializing wavelorm.
CX501 (12.0 MHz) is a clock which is used for CPU control. Figure B shows 1/4 divided wavelorm at Pin 28 ol
IC501.
CPU output data display Irequency and lunction etc. on LCD. LCD is back Iighted with Electro Luminescence,
which works
with 70 Vrrns, 300 Hz AC.
Powersupply comprises DC30
V, 8V and two5 Vlines.
IC501
25
R:i17
I
D501
$V- - -. - - - .:,::..:~_-
2.SV- - -
IC501
2S
,v-----,..:-,
ov--
Figure A
-6-
ov-----
~
Figure B

GENERAL OPERATION OUTLINE
Turn power SW on.
Automalically sets 10 SCAN
mode and
starts scanning when Ihe sa is on.
When battery vollage drops. "BAn" is
lndlcated and
peep-Ione sounds trom
Press REST ART SW localed
al Ihe rear
speaker.
panel.
j
Scan Banks 1Ihrough 10 are displayed. It
Ihere
is any blank scan bank, press Ihe
number key
10 Iighl all scan banks, and 10
blink one ot Ihem in one after anolher.
Press [1] Ihrough [9] key. Scan Bank 1 Press [MANUAL].
Ihrough9 will dlsappear.
Press [0] key. No response.
To holdIhe channel,press [DELAYI.
(when Ihis channel is nol set 10 [DELA Y].)
Press [1] Ihrough [9] keyand [0] key. Scan
Banks 1Ihrough 9 are displayed excepl 10. To
release Ihe delay tunction, press
[DELAY] again.
Press [SPEED] so tnat Scan speed IS
changed in !wo speeds, taslor slow. To skip certain trequency, press rl/OUT].
(when Ihis channel is nol set 10 [l/OUT].)
Press [SPEED] so that Scan speed Is
changed 10 the olher. To
release Ihe loek out tunetton. press
rl/OUT] again.
Ta obtaln priority operation in Scan mode,
press [PRI]. Tocall locked out channels, press [l/O
RVW] (This tunetion IS available when
locked out channels exist.)
To release priority operation, press [PRI]
•
agaln.
Ta priorily operatlon in manual mode, press
Press [MANUAL]. When [MANUAL] is
[PRI].
pressed again, Ihe channel advances. To
seteet one ot 1Ihrough 400 channels, To
release Ihe priority tunction, press [PRI]
push Ihe number key and Ihen push
[MANUAL].
again.
j
Ta start Direct
Search, press [DIRECT],
Press [PROGRAM] 10 sel 10 program mode.
Ihen press ["] or [AI key. No rsactlon
when Ihe trequency is 000.0000.
*1
-7-
*2

*1
Enter the deslred Irequency In each
channel aslollows:
Enter the desired Irequency with
numeral
keys.
Press
[ENTER]
to memorize Ihe
Irequency.
II wrong Irequency (out
ol the band) Is
antered.
"ERROR"
•displayed.
Press IS
[CLEAR] and then enter the correct
frequency.
Press [PROGRAM].
Advance
to
nex! channel. Enter the
frequencyand
press [ENTER]. repeat it to
memorizeIrequencles one by
one.
I
Press [PRI]
sa that prlorlly channel
appears. I
Ta revert la the prevlous channel, press
[PRI] again.
Press numeral
keys (1 Ihru 400) and Ihen
press
[PRI).
Priority channel is set la enlered
new
channel. I
Ta caU monitor channels, press
[MONITOR]. I
Press [MONITOR) 50 Ihat next monitor
channel appears.
Ta
caU the monitor channels directly,
press numeral
keys.
Ta revert la Ihe previous channel,
press
[PROGRAM).
-8-
*2
Enter search Irequency as lollows.
•
I
Press [UMIT] (or numeral key
and
[LIMIT]) and enter lower Irequency wlth
numeral keys.
1
Press [ENTER].
Press [LIMIT] and enter upperIrequency.
Press [ENTER].
Ta change mode. press [MODE].
The mode chenges In
the order ol
AM-NFM-WFM.
Ta change step, press [STEP].
The step changes 5 kHz -12.5 kHz - 50
kHz.
Ta relurn la the inltial setting ol mode and
step, press [RESET].
Press [.t.] la search from lowerIrequency.
Press ["1 la search Irom upper Irequency.
(squelch must be on)
Press [MONITOR] to store the desired
Irequency
(10 monitor channels) in the
search mode.
Press [ENTER] to store Ihe desired
Irequency
in the Indicaled channel.
Search operation starts.

Alignment and Test Points
UnearPCB
pc-,
ALlGNMENT
•
~
...
@
Lr
L2
TG
T5
~ ~~D
::;]
~
Te CF4
~D
T4
T3~
T7
T2~
(
~
) TI
L!l2
)~
l@i@1 (:!.I
~ 19 I PC-I
I
L!l4 L!l3
Shleld Case
TP I
Shield Case
TP2
PLLPCB
PC-2
Shield Case
en
=0
"''''
--'--'
88
0-
PLL-2 0PLL-I
N
::!J
I
U
e,
L312
CC
TP 301 Shleld Case
-9-
Shleld Case
TP302

Alignment Preparation
Test equlpment required
Oscuoscope
ACSSVM
DCSSVM
8-ohm dummy laad
AM. FM. SIgnai Generator (25 to 1300 MHz)
Distonion Meter
Note:
• Use non-metallic tuning roots.
• The test equlpment anel Receiver should be warmed up at least 15 minutes betore proceeding to a1ignment.
• The signallevel trom tOO Generator should be kept as low as possible obtaln usabIe output.
Program eH1 to CH1Q as fellows.
Channnel Frequency (MHz) and MODE Channel
Frequency (MHz) and MODE
1
804.500 (NFM)
6120.000
(AM)
2
220.495 (NFM) 7
300.495 (NFM)
3
520.000 (NFM) 8240.495
(NFM)
4
250.000 (NFM)
9
BOD.495 (NFM)
5
98.000 (WFM) 10
BOO.500(NFM)
Table 1
-10-

Alignmenl of VCO (PU 2)
Alignment Procedures
Step Contral Setting TestInstrument Adjust
Remarks
Channel Programming Connection
1OFFNOLUME contröl: Connect De SSVM to TP301
1.312 Adjust L312 tor 3V on the De
ON (Flgure1)
SSVM.
SQUELCH centrok
See Table2.
FullyCCW
(counterdockwlse)
Select channel
t.
Alignmenl of VCO (PLL 1)
Step Contra! Setting Test Instrument Adlusl Remarks
Channel Programming Conneetion
2OFFNOLUME control: Connect DC SSVM 10
1.309
1) Select channel 2 and adjust
ON . TP302
1.311
L309 ter 20 V on the De
SQUELCH control. (Figure 2)
SSVM. See Table 2.
FullyCCW 2) Select channel 3 and adjust
Select channel 2 and 3.
L311 tor 19 V in the De SSVM
SeeTabie 2.
Figure 1
TP301
UNIT
De SSVM
UNDER TEST rl.
Table2
Figure 2
TP302
UNIT
DC SSVM
UNDER TEST
rl.
Coil tsos, L311, L312 Col! alignment (open) eau alignment (close)
Figure 3 Figure 4Figure 5
r u~"OO
__ metallic
ICOiJ
/0011
tuning tooi
ecu
PIII"~"I!1I"""1
liiil~llllll(
/u ti lID lIt Il! It
, ,
PlL e.c.e.
PLL s.c.e. PLL e.c.e.
Notë:
•Open the coil as ahown •Close the coit as shown
•Perform eoils interval alignment delicately above by using
non metallic above by using non metallic
because it greatly affects thefrequency . tuning tooi when the meaeur- tuning tooi when the measur-
Fix the colls with glue after alignment and ing voltage al TP301 or ing voltage as
TP301
or
•TP302 is higher than the eet-
TP3Q2 is lower than the set-
then repeat the AUGNMENT PROCEDURES
ting voltage. ting voltage.
Step 1 and Step 2.
After checkinq the flxa-
tion and temperature belng normet.
- 11-

Alignment of 455 kHz NFM Discriminator coi!
Step Control Setting Test Instrument Adjust
Hemarke
Channel Program ming Connection
3OFFNOLUME control: Connect
Signal Generator to
TB Set the Signal Generator fre-
ON
ANT connector and DC
quencyto 250 MHz, 100 flV out-
SQUELCH controI: SSVM to TP2 (Figure 6).
put (NO MOD) and adjust TB tor
Fully
CCW
3.8V (± 0.1) onthe DC SSVM.
Select channel 4.
Alignment of 10.7 MHz WFM Discriminator coll
.
Step Control Setting Test Instrument Adjust
Remarks
Channel Programming Connection
4OFFNOLUME control: Connect Signal Generator to T4 Set the
Signa! Generator fre-
ON ANT connector and DC
quency to 98 MHz, 100 flV out-
SQUELCH contral: SSVM to TPl (Figure 6). put
(NO MOD) and adjustT4 for
Fully
CCW
3.9V (+ ö.üon the DC SSVM.
Selectchannel 5.
Figure 6
ANT
connector
TP1 or Tf'2
SIGNAL
UNIT
OC SSVM
GENERATOR UNOER TEST
).
Alignment of 48.5 MHz and 10.7 MHz WFM IF coil
Step
Contral Setting Channe1 Test Instrument Adjust
Remarks
Programming Connection
5OFFNOLUME
controI: Connect Signal Generator to T2 1) Set the
Signal Generator fre-
ON ANT
connector, and oscillo- T3 quencyto
98 MHz.
SQUELCH controI: scope, AC SSVM, distortion FM:
22.5 kHz Dev. at 1 kHz
FullyCCW meter and 8ohm laad to
and outputat SIN 20 dB point.
Select channel 5.
EXT SPKR jack. 2) Adjust T2 and T3 for maximum
(Figure
7)
sensitivity.
Alignment of 48.5 MHz 2nd IF een
Step
Control Setting Channel Test Instrument Adjust
Hemarke
Programming Conneetion
6OFFNOLUME control. Same as step 5.
T'
1) Set the Signal Generator fre-
ON T7 quencyto
120 MHz.
SQUELCH control:
AM: 60% Moel. at 1 kHz and
Fully CCW
output at SIN 20 dBpoint.
Select channel6. 2) Adjust
Tl ancl T7for maximum
sensitMty.
-12 -

Alignment of 455 kHz IF een
Step Control Setting Channel Test Instrument Adlust
Remarks
Programming Connectlon
7 OFFNOLUME control: Conneet Signa! Generator to TS 1) Set the Signa! Generator fre-
ON ANT connector and osciUo-
quencyto 120 MHz.
SQUELCH control: scope, AC SSVM, Olstortlon
AM: 60% Mod. at 1 kHz and
Fully CCW
meter and B ohm laad to output at SIN 20 dB point.
Select channel6.
EXT SPKR jack. (Figure 7) 2) Adjust T5 to maximum sensi-
tlvlty.
Alignment of 455 kHz AM DET. eon
Step Control Setting Channel Test Instrument Adjust Remarks
Programming Connection
B
Same asstep7 Same as step 7
TB
1) Set the Signal Generator fre-
quencyto
120 MHz.
AM: 60% Mod. at 1 kHz and
output at 1 00 IJ- V.
2) Adjust T6 tö minimum T.H.O.
point.
Figure 7
sn L08d
EXT
Ir
ANT
Spkr
connector
J~k
SIGNAL
UNIT
.V
AC
GENERATOR
r~
UNDER TEST SSVM
OSCILLOSCOPE
OISTORTION
METER
- 13-

Alignment of IF TRAP colls
Step Control Setting Test Instrument Adjust Remarks
Channel Programming Connectlon
9OFFNOLUME controI: Same as step 5
l2 1) Set the Signal Generator fre-
ON
quencyto 609.505 MHz.
SQUELCH controk FM: 3 kHz Dev. 1 kHz Mod.
Fully CON
Output approx. 300 uV.
Select channel7.
2) Adjust L2 to maximum sensi-
tlvity.
.
Step Control Setting Channel Test Instrument Adjust Remarks
Programming Connection
10 OFFNOLUME control: sameas
step 5
1.53 1) Set the Signa! Generator fre-
.
ON
l.S'
quency to 337.495 MHz.
-
SQUELCH control:
FM: 3 kHz Oev. 1 kHz Mod.
Fully CCW
Output approx. 3 mV.
Select channel 8.
2) Adjust LS3 and L54 to mini-
mum sensltivlty.
See Figure 8.
Alignment of 512 MHzTRAP coil
-: ..
Figure8
ti
Ull!nol'l
__ metallic
tuning tooi
COiJ~
til I/lU} /1lI12 ,\
,Linear
PCB
I co",
lz/II~IIII/I(
,Linear
PCB
Adjust L53 end L54
open or close
- 14-

,
Note: A1ignment of LS2 (HF-62H14 B.P.F. coU)
Do not adjust this cail because of l.S2 isalreadyadjusted at faetory.
II the coa is moved by mistake. adjustit asper below.
B.P.F. charaeteristic is Figure9.
Alignment 1at IF (611.5to 607.505 MHz) B.P.F. een
Step Control SettingChannel Test Instrument Adjust Ramarks
Programming Connection
11 OFFNOLUME controk Same as step 7 1.52 1) Select channel 9 and set the
ON Signal Generator frequency to
SQUELCH centrol. 800.495
MHz.
Fully CCW FM: 3 kHz Dav. at 1 kHzand t
Select channel 9and 10. pVoutput.
2) Adjust L52 to maximum sensi-
llvlly.
3) Select channel 10 and set the
Signal Generator frequency 10
800.500 MHz.
FM: 3 kHz Dev. at 1 kHz and 1
«v ourput.
4) Readjust 1.52 10 maximum
sensitivity.
NOTE: AUgn the balenee of eH
9, eH10 sensitlvity la become
same.
Figure 9
hl IF Center Frl!Q\lency (609.505 MH~)
4MHz
at CH9 (800.495 MHz) r--+-~
tsr lF Frequency .I_--f---l-~-- at CH10 (800.600 MHd
607.505 MHz'" lst IF Frequency 611_5 MHz
-15 -

Zeromatic Function Test Procedure
IC'
2
IC'
IC'
-,,
>,
,
,+
el
,
'0 +,
11
IC'
'~
,
I
:>7
p)
, +
,1
"
(NFM)
Discriminator Curve
IWFMI
IZeromatic lunetions when OUTPUT is in "H" levet.l
o<el <e3 e3 < et
<02 e2<e1<VCC
OUTPUT (1C3 Pin No. 4) L H L
(NFM MOD.)
Toadjust at voltage, receive signa! in Manual mode, anel set Ta to obtaln 3.8V (+ 0.1 V) at TP2.
Itisconvenient to uee the National Weather Service signal lor theadjustment.
(WFMMOD.)
Taadjust e1 voltage, receive signal in Manual mode and setT4 to obtain 3.9V (+ 0.1 V) at lP1.
It isconveniënt to use the FM or TV sound signa! lor theadjustment.
-16 -

Key Access Pulse Output (ICS01)
POQ (pin
po, (Pin
P02 (Pin
P03 (Pin
PQ4 (Pin
P05 (Pin
P06 (Pin
PQ7 (Pin
,
,.
9.46ms
,
',...
54) : I
I'r- I
53)
I-
,
29,1ls • I 11 ,
I-
,n
52)
86/015 .I
I-
:-
51 )I
r---130.l.ls
"I
50) I
I.
1591-'5
I ' I
491
t-
I.
186,115
.'I
I-
481
I
I.
215,1l5
• !
I-
47) II
'.
a12/o1s
• I ,.
Note: Use a signal at POl of ICSD1 as trigger, and then observe the keys access puree when [PROGRAM] key
pressed.
Data Waveform (IC-S01)
"
r-- 9Arns ----<
LT 1
(Pinl1)
DATA
(Pin 14)
CLOCK
(Pin 13)
LT 2
(Pin 10)
LCD CS
(Pin 9)
LCD CID
(Pin SI
LCD BUSY
(Pin 30)
IIII
I
llill
~
I,
I
III,
i
DISPLAY DATA
~ 17-

PLL Data Waveform
CLOCK
(Pin 13)
DATA
(Pin 14)
-'
-.-
~
I-
,,,
I" 263~5
..
256,,5 )1
LT 2
(Pin lOl
Note: Data 1n Program mode when 150.000 MHzis antered.
-18-

RECEPTION CHECK
Power ON
Doe,
NO
<Display
Work
Properly?
YES
Doe.
NO
SQ function and
Scan when saIs
Is PowerSupply
ON?
circuit OK?
J..
YES
NO
«:
es Key-in work
Is voltage Regulator
properly?
OK?
I
YES
Is Keyboard and/or
Does the
nit Produce NOISE
associated circuit OK?
Is IC501 clcck
when volume control is
NO
oscillatien waveform
tumed clockwise? er
reset OK?
(SO: counterclo-
ckwise) Is
1C501 and reset
properly?
YES
Is epu eent-ot circuit
OK?
NO
Isreception 0
when correct frequencies
are entered ?
Is IC', 2and/or
associated circtJit OK?
Is 1C501 OK?
YES
Is DC-DC converter
OK?
Doe.
NO
«:
Memory function IsMute circuit
(1C3, 6,
~kOK?
Is voHage Regulator Q20
~ 23) OK?
Is IC504 OK?
OK?
YES
Is Audio Amp (1C7) or
END Is
RF filter Audio
Pre Amp (ICS)
setectlon(IC502,0501
OK?
~ 507) OK?
Is tF Amp or Noise
I
Amp circuit (IC1, 2)
OK?
Is Back-up batlery OK? Is
MODE (AM, NFM,
Is VCOfilter 1, 2
WFM) selection OK?
selection OK? (1C503,
(1C503, 026, 27, 28) 0301,305)
Is epu eontrot circuit j
(lNhich eensiets of 055, Is
PU circuit (which Is
IC501 OK?
Q29,3O, 31) OK?
Is veo (VC01, VC02) consists of
(1C3Q1, 302,
selection
OK? (IC503,
303,304) OK?
Q309,310)
Is memory power supply
circuit (which consistof Is
veo Circuit OK?
1C9) OK?
-19 -

MEMORY CHECK
Power ON
Enter (Program) 150.0000 in eH 1
Power Switch OFF
Does
NO
5+ 0.3 V exist at Pin 67
Defectlve Back-up circuit, 1C9
of le501 ?
YES
Power Switch ON
NO Detective
epu control circuit, 029,
Is 150.0000 displayedat 30,31 or
Memory IC5DS
eH 1?
YES
Disconnect AC Plug (or Ext.Power)
and then insertafter 2 hours.
Power Switch ON
15 150.0000 NO IDetective Back-up battery I
displayedat eH 1?
YES
MEMORY circuit is OK.
- 20-