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DESCRIPTION OF COMPONENTS
TX-RX UNIT (X57-4590-XX)
-10
:
TK-940 -11
:
TK-941
1
1
Ref.
No.
1
Parts
No.
Use/Function
OperationlCendition
(
IC1
1
BU4013BF
/
Power supply circuit loglc control
1
Audio amplifier (Detected output)
[i~:
1
NJM4558E
1
---
NJM78L05UA Voitaqe reuualtor
1
1;;
1
pPO8
Voltage regulator
--
NJM4558E Act~ve f~lter
lC6 ~62363~~ Level adluster
A
IF system
NJM4558E
N
J
~455~t~
'
--
U4094B C
F
----
.
~L=l
Aud~o power amplifier
--
----
I
IC13 NJM2904M Comparator, DC amplifier
-
--
I
El
'
AT24C02NlOS12.7 EEPROM T,a7acity 2-Khit.
NJM78L05UA
--
Voltage regulator
--I
--
--
---
IC208 TC7S32F DC swltch
"L"
when IC207 access.
"L" when writlng program or data from external
equipment.
--
I
---
I*'
1
1
DTCll4EU DC swltch f.-wm=d,
---
then Q3 turn off
I,,
FAA::~
fl'ter
DTA114EU
--(DC
switch
a3 DC switch On when power swltch on.
2SA1641 (S,T)
Q4 DC switch On when power swltch on.
Q5
DTA114YU DC switch
--
Oh when power switch off, then D22 turn on.
Q6, 7
2SB1188iQ, R) DC switch
---
RX
.
OV, TX
:
8V
08 2SA1362iY) DC switch
RX
:
8V, TX
:
OV
09 DC switch On when PLL lock.
Q10
On when PTT switch on.
--
DC switch
01 1 DTC114EU On when RX.
Q12 DTC114EU
On when
TX.
--
DC switch
Q13
DTC114EU DC sw~tch
On when horn control on.
Q14 2SD162415) DC switch
On when horn control on.
-
Q15 2SC4116(GR)
--
Ripple filter
Q16
2SC4215(Yi
--
RX
I
st IF amplifier
--
45.0375MHz (TK-9401, 39.0375MHz (TK-941)
01 7 DTA114TU
Muting switch
On when no beep sound at busy.
Q18
2SC4226(R24)
1
RF amplifier
-
019 DTC144EU
---
DC switch
On when no beep sound at busy.
Q20 DTC3
14TK Muting switch
Off when busy.
--
3SK241 (R)
APC controller.
On when PTT switch on.
Q26
Q27
DTA114YU
028
Q29
DTC114G
1
On when IGN line "H".
Q30
2SA1586(Y,GR)
I
DC switch
I
On
when
modular lack SB terminal shorted.
On when
power swltch on