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RF-B45
RF-B45
lm TERMINAL GUIDE OF IC'S, TRANSISTORS AND DIODES
lm MEASUREMENTS AND ADJUSTMENTS
AN7205
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
Set power source voitage to 6 V DC.
¢Set tone select switch to HIGH.
Set sensitivity select switch to DX.
Set volume control to center.
Set AM mode select switch to NOR/FIX.
SB80734ANDYT1
$81230AGRBT1
UPD1724GB561
BA10393FT
©
2e
EQUIPMENT REQUIRED
Frequency counter
®DC digital voltmenter
iF monitor scope
2SB709RTW
2SK160K4TW
Ampere meter
*Oscilloscope
28C2404CTW
2SK160K5TW
.
Signal generator (FM/AM)
eFM/AM IF sweep generator
c
D601RTW
2SK436A21TW
O
AVIDTOT4YRW
RS
BATTERY CURRENT CHECK
B
:
6
€
FREQUENCY
:
KD
DISPLAY SETTING
REMARKS
D
1. Power switch
to OFF.
2. Check for less than 50 pA. (for back-up current check)
1. Power switch to ON.
87.50 MHz
2. Volume control to minimum.
3. Check for tess than 70 mA.
2SK238K16TW
MA165TA
OASOA-M
MA7OOTA
RVD1SS135TA
SS | "Fe
MA724TW
MA4120MTA
MA151KTW
Co
&
cs
ae Tae
ae Cathode
A
Cathode
B
A
Anode
Anode
I
Zathode
Anode
1. Power switch to ON.
1620 kHz
2. Volume control to minimum.
3. Check for less than 80 mA.
MA701TW
RVDSVC203ATW
1MN11T110
LN376GC PX-23
Cotnade
eB
arose
| Anod
nove
AY:
anoe | ANCL?
carnode
Anode
cathode
a—@~ ceo
MA729TW
Anode
Cathode
a
Cathode
SS
mab
Anode ra
Cothode
A
eFM AND AM (SW) VCO ALIGNMENT
FREQUENCY
DC DIGITAL
:
Cathode
Cathode
Anode
Ano
Fin
be
Function
Pip |
Mark
ve
Functior
No.
Division
No.
Division
"
1
'
Device select signal input
>
Output
terminals
for LCD
t
5
Hl
0
jerals si
seamen
29
terminal. Set the terminal high to
i s
10
,
select adevice and low to deselect
:
Connect to
1
=
———-
coe
Point of noninterference.
me) Pt.
e Adjust VR3 for 55386+0.1 kHz reading on frequency counter.
12
30
Terminal used for connecting a
'
——- (-)
}
'
ro)
Output terminals for LCD common
quartz osillator.
;
i...
)
signals.
14
COMi
as
xi
'
Connects a 75 kHz quartz
Connect to
15
Vv
oscillator.
.
F
through 10 pf.
Assure that the frequency control's reading is variable by
=
Reference voltage setting
Point of noninterlerence:
"(4)
rotating the frequency contro! (VR2).
16617]
CAP1+2
—
capacitor connected terminals tor
32
vss4
—
Terminal used for connecting a
.
LCD.
capacitor for regulator circuit.
+
18 | vsse
.
a
ee
@SSB RESTORATION FREQUENCY (B.F.0.) CHECK
19
VDP
fe)
Variable duty port.
2
4 bit I/O port.
be
ee
20
CGP
te]
Clock generator port.
21 +— NC
4 bit Output port.
Point of
:
1. Set AM mode select switch to SSB position.
22
vob
'
A voltage of 1.8~3.6 V supply to
ne
2. Assure that the frequency counter's reading is 459+ 1 kHz.
this terminal.
Output terminals for key signals.
fe
FM IF CHECK
23
VHF
—
—S
IF SWEEP
jeanne
input terminal for the FM local
;
GENERATOR
FREQUENCY
iF MONITOR
24
HF
1
sllator
(VCO)
s i
Input terminals for key retum,
BAND
DISPLAY
SCOPE or
REMARKS
Seetiator
VCO) sional.
signals
SETTING
| OSCILLOSCOPE
.
CONNECTIONS
FREQUENCY
25
AMIN
—
a
26
vss1_ |
|
Ground terminal.
st
coe
10.7 MHz
hho
(a)
Assure that the waveform shown in Fig. 3
ra
EQ.
i
o—
)
;
0
Output terminals for LCD segment
400 Hz
oniabout
re (-)
appears in the IF monitor scope or
:
sé | tcp1
signals.
30% Mod.
(
)
i...
oscilloscope.
28
coz
|
0
PLL error output termina'.
90 MHz
—15—
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