Realistic PRO-2004 User manual

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CUSTOM MANUFACTURED FOR RADIO SHACK. A DIVISION OF TANDY CORPORATION
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•SPECIFICATIONS ,•
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DESCRIPTION NOMINAL
SPEC.
LIMIT SPEC.
Frequency Range
Sensitivity
NFM:
AM:
WFM:
Selectivity
NFM/AM
WFM
20 dB SIN at 3kHz'DEV. 1kHz
25to 520 MHz
760 to 1100 MHz
1100
to 1300 MHz
20
dB SIN at 60% MOD. 1kHz
25 to 520 MHz
760 to 1100 MHz
1100
to 1300 MHz
30 dB SIN at 22.5 kHz DEV. 1kHz
25to 520 MHz
760
to 1100 MHz
1100 to 1300 MHz
-6dS
-SOdS
,
0.5 p.V
0.5 p.V
3.0,.,.V
2.0,.,.V
2.0p.V
3.0 p.V
3.0 p.V
3.0,.,.V
10.0 JlV
±9 kHz
:15 kHz
•
25 to -520 MHz
760 to 1300 MHz
2.0 p.V
2.0 p.V
10.0 JlV
5.0 JlV
5.0,.,.V
10.0 JlV
10.0 p.V
10.0 JlV
2O.G-p.V
±12 kHz
±18 kHz
-6 dB
-SOdS
Modulation Acceptance: EIA R5-204·A
Spurious Rejection
at 328 MHz (NFM)
Image Ratio at 70 MHz (NFM) .
70 MHz +
(2x61 0MHz)
=1290 MHz
±150 kHz
±300 kHz
.:!:8 kHz
40 dB
35dB
±200 kHz
±400 kHz
:1:5' kHz
35 dB '
25 dB
IF Rejection 610 MHz at 70
MHz eN FM)
608 MHz at 1000 MHz (NFM)
Signal to Noise Ratio
NFM/AM 3kHz DEV.
at 1kHz
60% MOD. at 1kHz
100
p. VINPUT
WFM
"
40 dB
40 dB
30dB
35dB
2.0 IlV
2.0 IlV
10.0 p.V
15 dB
•
,
45dB
0.5 JlV
0.5 JlV
3.0 p.V
25dB
60dB
GO dB
40 dB
•
25 to 520 MHz
760
to 1100 MHz
1100
to 1300MHz
(8 +N/N)
Tight
22.5 kHz DEV. at 1kHz
Squelch Sensitivity
NFM/AM
Threshold
WFM
Threshold
,
Tight
Scanning Rate
•
25to 520 MHz
760
to 1100 MHz
1100 to 1300 MHz
(S +N/N)
Fast
Slow
3.0
p.V
3.0 JlV
10.0 JlV
40 dB
16 channel/sec.
S channel/sec.
10.0 p.V
10.0 p.V
20.0 p.V
30dB
-
14 to 18 channel/sec.
1 to 9channel/sec.
-3-

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Search Rate
•
~5V 4.5±0.5V
Fast
Slow
Residual Noise (Vol. Min.)
Priority Sampling
Scan Delay
Time
Audio Output Power (T.H.D. 10%)
Tape Output
MOD. and DeV: .
NFM 3 kHz DEV. at 1 kHz
AM 60% MOD. at 1 kHz
WFM 45 kHz DEV. at 1kHz
LOAD: 10 k ohm
INPUT: 100 J.LV
LOW BATT Indicator
16 steps/sec.
8steps/sec.
3mV
2sec.
2 sec.
1.8 W
600mV
14 to 18 steps/sec.
7 to 9steps/sec.
5mV
1.5 to 2.5 sec.
1.5 to 2.5 sec.
1.3 W
300mV
•
Channels of Operation
ctumnet, Frequency and Mode Display
Receiving System
Power Source
Speaker
Dimensions
Weight
Any 300 channels in any band l:ombination
(30 channels x10 banks), and 10 Monitor
channels.
Liquid crystal display
Direct Key Entry Digital Controlled
Synthesizer, Superheterodyne.
AC 120 V, 60 Hz, 20 Wmax.
DC 13.8 V, 12 Wmax.
Built-in 3"·(77 mm) 8 ohm Dynamic Speaker
Approx. 2-7/8" (75 mm) x 10-1/4" (275 mm)
x 9" (230 mm) HWD
7.0100 (3.2 kg.)
NOTE: ("ominal Specs mpfflSBnt th8 design specs: all units should be able to approximate thesl1 - scme wiJll1xceed and
St:Jme may drop slightly below theSB sp~ Limit Specs represl!nt the absolute wom condition that still might be
consideredacceptable; in no castt should a unit {)8rform to 18ss than withi" any Limit Spec.
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PRINCIPLES OF OPERATION
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The PRO-2004 is aPhase Locked Loop (PLL) synthesized VHF/UHF, AM/FM Receiver controlled by a
Central Processing Unit (CPU) via
the keyboard.
Receiving mode and search step are initially set to correspond with the frequencies entered. When afre·
quency within
FM broadcast band is keyed in, receiving mode is set to Wideband FM (WFM). When a
frequency in Action radio band, Police, Fire, Ambulance, Ham radio etc.
is keyed in, the mode is set to
Narrowband FM (NFM), and when a frequency in Aircraft and CB band is keyed in, it sets to AM mode.
Also
the mode and step can be changed by [MoPFJ, ISTE:P) Keys.
The
CPU (IC·503) controls receiving frequency range, frequency determination, scanning speed, delay time,
etc. The
CPU is able to do only the assigned functions, and no modification of the CPU is feasible.
The following paragraphs explain
the operation of the circuit in terms of the functional blocks:
RF
input circuit comprises 10 dB attenuator and Bandpass filter. Asignal generated by VCO-' or VCO·2 is
applied to Double balanced mixer (D.S.M.) via Low-pass or High-pass filter and mixed with the RF signal.
The D.B.M. is employed
to facilitates 25 MHz to 1300 MHz mixing. --
The
1st IF (05) is 607.505 MHz to 611.500 MHz, and the signal is mixed with VCO-3 frequency at the 2nd
mixer
(06) to produce 48.5 MHz signal, which is applied to WFM IF (012) or AM/NFM IF (010, 018,
019). Corresponding with input from the keyboard, CPU determines which of VCO-1 or VCO-2, WFM IF,
AM/NFM,
AM IF, Data of PLL circuit to be functioned, and outputs the necessary data•
. A signal
entered to AM/NFM IF is mixed with X'tal oscillation frequency 48.045 MHz at the 3rd mixer
(IC-2) and converted
to .455 kHz signal. Asignal entered to WFM IF is mixed with X'tal oscillation frequen-
cy
37.8 MHz at the 3rd mixer (013) and converted to 10.7 MHz signal. The signals are further amplified
and detected
to AF signal.
•
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AF signals of WFM, AM, NFM are CPU controlled and applied to AF Power Amplifier (tC-7) via switching
circuit. Squelch signal is comprised
of noise product from WFM/NFM detector output, and amplified by
IC-2 to switching signal, which controls AF mute and CPU.
Any unstable supply voltage to the CPU can produce CPU malfunctions, such as wrong data processing,
wrong data transfer,
etc~ To overcome this C512 and R501 "initialize" the CPU. Initialization is done when
RESTART switch is pushed. Figure Ashows initializing waveform.
•
•
CX501 (7.37 MHz) is aclock which is used for CPU control. Figure Bshows 1/4 divided waveform at Pin
.31
of 1C-503.
•
CPU output data display frequency, function, etc. on LCD. LCD is back lighted with Electro Luminescence,
which works from
70 Vrms, 300 Hz A.C.
Power supply comprises
D.C 30 V. 8 V and two 5 V lines.
lC5D3
~8
I
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•
11501 C!l12
5"V-- ----------
0.4
•
2.5Y-- -
0\1--
--
Figure A
5'01--
0\/ --
IC503
31
%t 30
~ R502
r-t----.,
I0I
I I C
IT =*= I
I I
\.._--
---~
---
---
O.!!<I.
Figure B
•

GENERAL OPERATION OUTLINE •
•
Turn power SW ON.
Automatically set to
SCAN mode and starts
scanning when the sa
is on.
When battery voltage drops "BAn" is
f-------------------- indicated and peep-tone sounds from speaker.
Press RESTART SW.
+
Scan Bank 1thru 10 are displayed.
1t•
Press mthrough 1m key.
To hold the channel. press loELAYl.
Scan Bank 1thru 9are disappeared. 0
To release the delay function, press IOELA YI
,•
Press ~key. •again.1-.
.i
To skip certain frequency, press ILOCK-GUTI.
Press Iilthrougt'l mJ key and EB key.
Scan Bank 1
thrJ,J 9are displayed except 10. ,
To release the lock out function, press
.1
I LOCK·OUTI again.
Press !SPEEDI so that Scan speed
is set to
•
slow speed. •
.To call locked out channels, press
,I
LOCK-GUT REVIEWI.
Press ISPEE DI so that SCan speed is set to fast
(This function is available when locked out
speed ..
••channels exist.) •
To priority operation in Scan mode press IPR II. To priority operation
in manual mode, press
Ip R II.
0
.1
To release priority operation, pr9SS IPRII again. To release the priority.function, press •
IPRII again.
j
.-
Press IMANUAL!. When IMANUAll is pressed
Press IPROGRAMl to set to program mode.
again the cahnnel advance. To select one of t
thru 300 channels, push the number key and ~.
•
then push IMANUAL].
•
0
. .1
Press lP'f'lmcl1. Step indicator is displayed.
·1
"2
(Step indicator is not displayed when frequency
is oaoo.OOOO.)
To start DIRECT Search, press 00 orffi key.
•
•
••
Press lYIANUAL].
0
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-7-'

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Key in search frequency as follows.
.i
Press ILIMIT] (or numeral key and ILlMITIl
and key in lower frequency with numeral keys.
•
.+
-•
Press I ENTE R}.
t•
Press I L1MITI and key in upper frequency.
.t
-.
Press I ENTE R I.
•
.i
To change mode, press [ MODE].
The mode changes in the order of AM -
NFM -WFM.
To Change step. press ISTEPl.
The step cflanges 5kHz -12.5 kHz - SO kHz.
••
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To return to the initial sening of mode and
step. press lRESET/.
Press ~ to search from lower frequency. Pr8'SS
(!l to search from ~per frequency.
(squelch must
be on)
••
Press I MONITOR Ito store the desired frequency
(10 monitor channels)
in the searcl'rmode.
.,
•
Press I ENTER Ito store the desired frequency in
the indicated channel.
Search operation starts.
•
Key in the desired frequency in each
channel
as follows:
••
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Key in the desired frequency with
numeral keys. •
Press IENTE RI to memorize the fre'
••
.. quency.
If wrong frequency (out of the band) is
entered, "ERROR" is displayed.
Press IfLEARI and then enter the correct
frequency.
+
Press IPROGRAM!. -
Advanclt
to next channel.
Key in the frequency and press [ENTER!.
repeat it
to memorize frequencies one by
one.
•
Press !PRII so that priority channel is
appeared. •
•
To revert to the previous channel, press
[PRIj again.
~
Press numeral keys (1 thru 300) and then
press
IPRII.
Priority channel is set to entered new
channel. t
To call monitor channels, press
(MONITORI.
~
Press IMONITOR] so that next monitor
channel is appeared.
To call the monitor channels directly,
press numeral keys.
i
To revert to the previous channel, press
I PROGRAMI.
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-8-

ALIGNMENT
ALIGNMENT AND TEST POINTS
(LINEAR PCB)
TP4 TP3 TP5
LI O.....---SHIELO
CASE
'--SHIELO
CASE
•
155
(@)
SHIELD
CASE
[@] 10 il~
113 T7 T3
CF-2 ~ @ ~
T2~
TI2 Til TIO 9 TI
~ ~O~00~ 0
IPC-I I
SHIELD CASE TP2
(PLL PCB)
SHIELD CASE
L311 L
A ~
t-:-SHIELD
CASE
@o-rr-i-TP301
'"
I
U
Q.
PLL-2
PLL-I
TP302 SHIELD CASE
-9-

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ALIGNMENT PREPARATION
Test equip"ment required
t. Oscilloscope
2 ACSSVM
3. DC SSVM
4. B-ohm
dummy load
5. AM. FM. Signal Generator (25 to 1300 MHz)
6. Distortion Meter
•
•
NOTE 1: Use non·metallic runing tools.
The test equipment and Receiver should be warmed up at least 30 minutes before proceeding
with alignment.
Input signal from the Generatorshouldbe kept as low as possible and still obtain usable output.
•
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•-
if) -

ALIGNMENT PROCEDURES
•
•
Step Control Setting
Test Instrument
Adjust Remarks
Channel Programming
Connection
1 OFF/vOLUME control: Connect DC SSVM to
L309.Alignment
of VCO (PLL·1)
ON
TP301 L311 1) Select Channel 1
(220.495 MHz)
..
SQUE LCH control: (Figure 1) and
adjust L309 for 20V on the DC
Fully counterclockwise SSVM.
(CCW) .See Table 1.
Channel Programming: 2) Select Channel 2
(520 MHz) and
CH1 (220.495 MHz) adjust L311
for 20V on the DC
CH2 (520 MHz)
•SSVM.
".
See Table 1.
Alignment
of VCO (PLL-2)
2
OFF/vOLUME control:
Connect DC SSVM to
L317 Adjust L317
for 3V on the DC SSVM.
,
ON
TP302
See Table 1.
SQUELCH control:
(Figure 2) -.
•
Fully CCW
Channel Programming: •
CH3 (804.5 MHz) ,
.
•
Figure 1
TP301
UNIT
.UNOER TEST 1-----
DC SSVM
Table 1
Figure 2
•TP302
UNIT
DCSSVM
UNDER TEST
'T'
,,,
.-
, I
Coil L309, L311, L317 Coil alignment (open) Coil alignment (close)
Figure 3Figure 4Figure 5
17
Use non
metallic -Coil
tuning tool
Coil
Coil~
LI
;'"
t'I
•
VJ
... .....,
•~
,.c;
PLL P.C.B. •
PLL P.C.B.
PLL P.C.B.
,.
NOTE 1:
Perform coils interval alignment *Open the coil as shown
*Close the coil as shown
delicately because it affects above by using non metallic above by using
non metallic
.frequency much. tuning tool when ameasuring
tuning tool when ameasuring
NOTE
2: Fix the coils with glue after align· voltage
at TP301 or TP302 is
voltage at TP301 or TP302 is
.
ment and then repeat the ALIGN· higher
than the setting voltage.lower
than the setting voltage.
.MENT PROCEDU RES
Step 1, Step
2after checking the fixation and
.
,
temperature is normal. .
- 11 -••

•
Step
Control Setting
Channel Programming Test
Instrument
Connection
Adjust Remarks
3
OFF/vOLUME control:
ON
SQUELCH control:
Fully counterclockwise
Channel Programming:
CH4
(250 MHz -NFM)
Connect Signal
Generator
to TP1, DC
••
SSVM to TP2 and TP5
to ground.
(Figure 6)
Tl
T9
Tl0
Tl1
T12
Alignment of NFM/AM 2nd IF
1) Set the Signal Generator frequency
to 48.5 MHz, 0.3 V output (NO
MOD).
2) Adjust Tl, T9, Tl0. Tll to maxi-
mum voltage at TP2.
3) Adjust Tl2 to minimum voltage at
TP2. approx.
0.2V on the DC SSVM.
NOTE: Perform these adjustment
by using the DC SSVM which is able
. to measure to three decimal places
because
of the output voltage of
TP2 is low.
Figure 6
•
•
•
TP1
TP2
•
SIGNAL
UNIT
DCSSVM
GENERATOR
UNDER TEST
'I7
•
TP5
",
,
•
•
Control Setting Test Instrument
Adjust
RemarksStep •
Channel Programming Connection •
4 OFF/vOLUME control:
Connect Signal Tl3 Alignment of 455 kHz NFM
ON Generator
to TPl and Discriminator coil
SQUELCH
control:
DC SSVM to TP4. Set the Signal Generator frequency'to
Fully CCW (Figure 7) 48.5 MHz,
100 jJ.V output (NO MOD)
Channel Programming: and adjust
T13 for 3.8V (±0.1) on, the
CH4 (250 MHz - NFM)
•
DCSSVM .•
-
Connect Signal ,
T6
Alignment of 10.7 MHz WFM .
5 OFF/VOLUME control:
"
Generator to TPl and •Discriminator coil
ON
SQUELCH
control: DC SSVM to TP3. Set the Signal Generator frequency
to
Fully CCW (Figure 7) 48.5 MHz,
100 jJ.V outPut (NO MOD)
Channel Programming: and adjust
T6 for 3.8V (±0.1) on the
•
CH5 (98 MHz -WFM)
DCSSVM.
Figure 7
TP1
TP30rTP4
SIGNAL
UNIT
DCSSVM
•UNDER TEST
GENERATOR
.r
."
",
-12 -••

Control Setting Test Instrument Adjust Remarks
Step .
Chanel Programming Connection
6
OFF/vOLUME control:
Connect Signal T7 Alignment
of 455 kHz IF coil
ON Generator
to TPl and 1) Set the Signal Generator frequency
SQUELCH
control:
Oscilloscope. AC SSVM.
to 48.5 MHz.
Fully CCW Distortion Meter, 8n
AM: 60% MOD. at 1 kHz and
Channel Programming: Load
to EXT SPKR100
p.V output
CH6 (120 MHz -AM)
JACK.
2) Adjust T7 to maximum sensitivity.
(Figure 8) .
7
Same as step 6 Same as step 6 T8
Alignment of 455 kHz AM DET.
coil •
1) Set the Signal Generator frequency
to 48.5 MHz,
AM: 60% MOD. at 1 kHz and
100
p.V output.
-.
2) Adjust T8 to minimum T.H.D.
•
point .
Figure 8 '
•
an 'LOAD
EXT
SPKR
TP1
JACK
SIGNAL
UNIT
AC
UNDER TEST SSVM
GENERATOR
/II
OSCILLOSCOPE
"
,
DISTORTION
METER
,•
_1'"l _
. ~
•

Step
Control Setting Test Instrument Adjust Remarks
.Channel Programming Connection
8
OFF/VOLUME control:
Connect Signal T2 Alignment
of 48.5 MHz and
ON
..
Generator to ANT, T3
10.7 MHz WFM IF coils
SQUELCH control:
connector and T4
1) Set the Signal Generator frequency
Fully CCW Oscilloscope, AC SSVM, T5 to 98 MHz
•
Channel Programming: au LOAD to EXT
FM: 22.5 kHz DEV. at 1 kHz MOD,
CH5 (9a MHz -WFM) SPKR
JACK.
output approx. 2 JJ.V.
(Figure 9)
2) Adjust T2, T3 to maximum
sensitivity.
NOTE:
Alignment of T4, T5 are not
•necessary.
.
When those core are turned, adjust
cores
so that those tops of cores
become
as high as those coil case.
SIGNAL
GENERATOR
ANT connector
o
II'
Figure 9
UNIT
UNDER TEST
•
EXT SPKA
•
",
sn LOAD
ACSSVM
•
OSCILLOSCOPE
Step •
Control Setting Test Instrument Adjust Remarks
Channel Programming Connection ••
9 OFF/VOLUME control: L1
Alignment of IF TRAP coils
ON L55 •
1) Set the Signal Generator frequency
SQUELCH control: Same as step a
to 609.505 MHz
Fully CCW FM: 3
kHz DEV. 1 kHz MOD.
Channel Programming:
Output, approx. 3 mV
CH7 (300.495 MHz -2) Adjust L1 and L55
to minimum
NFM)
sensitivity.
.
10
OFF/vOLUME control: L60 Alignment of 512 MHz TRAP coil
.ON
1) Set the Signal Generator frequency
SQUELCH control: Same as step 8
to 337.495 MHz
• Fully CCW FM: 3kHz DEV. 1
kHz MOD,
Channel Programming:
Output, approx. 3 mV
CHa (240.495 MHz-
•
2) Adjust L60 to minimum
NFM)
•sensitivity.
••-
14-

•
NOTE: Alignment of L59 (GR-H763, B.P.F. coil)
Do not adjust this coil because of L59 is already adjusted at Factory.
When
tum the coil core, perform the alignment as below (step 11).
B. P. F. characteristic is Figure 10.
Step Control Setting Test Instrument
Adjust
Remarks
Channel Programming Connection
11
OFF/VOLUME control:
Same as step 8L59 Alignment 1st
IF (611.5 to
,ON (Figure 9) 607.505 MHz) B.P.F. coil
SQUELCH
control:
.
.1) Select channel 7(800.495 MHz) and
Fully CCW
set the Signal Generator frequency
Channel Programming:
to 800.495 MHz,
CH9 (800.495 MHz)
FM:3 kHz DEV. at 1 kHz and
CH10 (800.500 MHz) 1
IlV output.
2) Adjust L59 to maximum
sensitivity.-.
3) Select channel 8(800.500 MHz) and
set the Signal Generator frequency
to 800.500 MHz,
FM: 3 kHz DEV. at 1 kHz and
11lV output.
4) Adjust L59 to maximum
•••
sensitivity.
•
NOTE: Align the balance of CH9, CH10
,sensitivity to become same.
•
•
Figure 10
1st IF Center Frequency 1609.505 MHz)
4MHz
at CH9 (800.495 MHz) _~ __ .. at CH10 (800.500 MHz)
1st
IF Frequency ~--+--_ 1st IF Frequency 611.5 MHz
607.505 MHz
•
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_ ,1:; _
,-•

•
ZEROMATIC FUN-CTION TEST PROCEDURE ,
,
••
Ica
~1--...J...=.6 5 _
6-""
ICS
•
...
•
IC6
,,
•
'.
••
Discriminator Curve
(NFM)
(WFM)
(Zeromatic functions when OUTPUT is in "H" leveL)
O<e1<e3 e3<e1<e2
e2<e1 <VCC
.'
.OUTPUT lIC3 Pin No.4) LHL
(NFM MOD.)
To adjust el voltage, receive signal in Manual mode, and set T13 to obtain 3.8 V (±O.l V) at TP4.
.It
is convenient to use the National Weather Service signal for the adjustment.
(WFM MOD.)
To adjust e1 voltage, receive signal in Manual mode and set T6 to obtain 3.8 V (±O.l V) at TP3.
It
is convenient to use the FM. TV. sound signal for the adjustment.
-1S -

•
KEYS ACCESS PULSE OUTPUT (IC-503)
I
I
------------ __ • I
I
~----------------Ir
I
•
201"\ls
.~
.
I-
235.51Is
.1
11O--~ I llooo- t
,
I~-------- 270~"\Is------_.1
I
•
I
I
I
10ms
I •
I
po~
I,
I
II,
POI
Z9.5"\1s~ ,
P02 II Ir--I~ l
6~5"\1s~ I
P03 I I I,-
I- 10411$ ., I
P04 -1~ II""""J---------' ,-
I • 166.51Is •!I
P05 -1~ 1, ~---I~
I I
P07
P06
•
NOTE: Use a signal at P01 of IC-503 as trigger, and then observe the keys access. pulse when IPROGRAM I
key is pressed.
•
DATA WAVEFORM (IC-503)
I
I
I
I
•
•
I I
II
II
I
I
II
-I. 1_, -- DISPLAY OATA-------'~l
'PLL DATA
I
I
I
~
DISPLAY DATA
I
I
I
I
11'"""---- 16.7ms -_, I I I
III I
I I I I
I I 1---------...----1---------
III
: I II
I I I ,
_
___ -i- ~-...l'------------------'--------
I r---->- I
o -------T- ;------ ,
I
I
I
10-, 1_----------- 50.5ms .. - ----------. I
II
----',--------------
BUSY
(Pin 13)
•
-
LCD C/O
(Pin 14)
LCD CS
(Pin 15)
CLOCK
(Pin 19)
DATA
(Pin 20)
LT I
(Pin 17)
LT 2
(Pin 16)
•
••
17

'PLL DATA WAVEFORM ,
I
1
I
nnnr
Inl
r-ln,
JU
•
CLOCK
(Pin 191
DATA
(Pin 201
II
>k
I
I
I(
424",s
434"'5
)l
LT III
(Pin \7)
II
I
II
\( 286"'5
43445
)!
~
LT 2I
I
(Pin 161
I
NOTE: Data in Program mode when 150.000 MHz entered.
•
•
••
-18-

••RECEPTION CHECK
,
•
•
Power ON
./
..
Do ..
NO
Display Work
:>
Properly?
./
YES
•
Does SO
<function and Scan
::>
NO
When SO is
ON?
YES
•
Does
NO
KeV·in work
:>
.
properly? •
•
YES
Is Power Supply circuit
OK?
....... Doesthe
•
Unit produce NOISE
NO
turned clockwise?
Is voltage Regulator
OK?
ISO:
counter-
clockwise)
YES Is I
C503 clock
oscillation waveform
•
or r .. et OK?
15 reception
:> NO
OK when cOrrect .
< frequencies are
entered?
Is CPU control circuit
••OK? • .•
YES t
Is Keyboard and/or
Is DC .DC converter
Is IC503 OK?
<
Doe<
OK? associated circuit OK?
NO
Memorv function
:>
work OK?
YES
Is voltage Regulator 1$ IC503, and rese'
Is Back-up battery OK?
Is IC701 OK? •
OK? properly?
END
Is CPU control circuit
Is RF filter select
Is IC1. IC2 and/or
-
(which consists of D49, IIC501,
Q501-507)
anccist circuit OK?
030,31.34) OK? OK? -
+.
•
Is memory power supply
Is MODE lAM, NFM,
-
is IF Amp or Noise
Is Mute circuit nC4,
circuit (which consist WFM)
,elect OK?
023,24,251 OK?
Amp circuit IIC1,IC21
of 1C9) OK? (I
C502, 027, 28, 291 OK?
.-
Is VCO (VCO I, VC02)
Is Audio Amp (IC7)
select OK?
Is IC503 OK?
lIC502, 0315, 316)
or Audio Pre Amp (leG)
OK?
Is VCO filter I, 2
select OK?
•IIC502,
0301,3021
•
•
Is PLL circuit (which .
consists of IC301, 302,
•
3031 OK? •
i.
•
•
Is VCO circuit OK?
-
•
.-•

MEMORY CHECK
I
-~ I
I
Entwl'_l
l~OOOO"CHI
i
I
"-,S";IdlO',
-'-
~~-
.0
~ __ 0raI'"
_ .. l'Ioo , at
~
,
'T
<U
I
__ .. ~ON
1.1$0.0000
~
()oQc, ... Cf'U .... ,....
-... .. 0111
.. _ .. WO. 3'. 34
.~-
'<U
0 .. 0<.=" AC ..... , ...
bL __ ",""
__ 3......n
I
Il'owo,s..""'ON I
.-l
~,-
"
~''''''CH''
~- ... -
IViS
Me-DRY ....",i. I. OK
-20-