Kenwood TM-281A Service Manual page 49

TX-RX UNIT (X57-8130-XX B/2): Display section
MIC
MICKEY
8C
VR901
GND
R31-0662-05
PTT/TXD
VARIABLE RESISTOR
ME
MIC
RXD
CM
MR VFO CALL
SP
SPOUT ENCA
MHz REV FUNC
SPGND
ENCB
S901
W02-3704-05
ENCODER
KI3 KI2 KI1
KI1
KI2
KS1
KI3
KS2
IC901
LCD COM0~3
PT6554LQ
DISPLAY SEG0~31
LCD DRIVER
DI
5C BL
D903~D905
8C
B30-2337-05
KEY BACKLIGHT
BL SW SW
Q902 Q901
RT1N141U-T111 RT1P141U-T111
D906~D911
B30-2337-05
8C
LCD ILLUMINATION
BRI SW SW
Q904 Q903
UMG3N 2SB1132(Q,R)
TX-RX UNIT (X57-8130-XX A/2): TX-RX section
IC1
MB15A02PFV2E1
PLLE
DT
PLL IC
CK
UL
16.8MHz
5C
CHARGE
TCXO PUMP
TCXOMOD
16.8MHz
X1
POWER
L77-1944-05
5C
VOL
FILTER
D/A IC705(5/8)
CONV. M62363FP-F
KS1
5C
8C
KS2
IC705(6/8)
M62363FP-F
DO
CE
TCXOMOD
CL
IC706(3/4)
BA10324AFV
SPGND
SPGND
SPOUT
SPOUT
IC705(3/8)
8C M62363FP-F
RXD
PTT/TXD
VOL
MICKEY
5C
IC706(1/4)
CM
BA10324AFV
ENCA
ENCB
DI
DO
Q701
CE
2SC4919-S
CL
IC703
D708
BRI
NJM2100V-ZB
DA2S101
POWER
MIC MIC
MUTE
ME SW AMP
GND
MICMT
5C
AGC
D709
1SS372F
IC705(4/8)
M62363FP-F
BRI
Q3
2SC4649(N,P)
Fin
AMP
8C
Q4 Q9
2SC5108(Y)F
MCH3914(7)-H
5C
Q1
RX
2SA1832(GR)F BUFF
VCO
Q2 AMP
2SC4738(GR)F
8CL
CV 8CL SW TX/RX
LOOP
Q5
2SJ347F
Q7
UMC4N
TX
VCO
Q6
KTC4080E-P TRIPPLER
MCH3914(7)-H
RIPPLE
8CL VCOMOD
FILTER
VCO oscillation frequency
Q8
RX: 371.900~447.895MHz (K,M2,M3)
KTC4075E(Y,GR)
W/NI
387.900~395.895MHz (M4)
D8
DA2S101
TX: 272.000~347.995MHz (M2,M3) RSSI
288.000~295.995MHz (K,M4)
Q502
D503
2SC4617(S)
HSB88AS-E
NOISE NOISE
SQIN
VCOMOD DETECTOR AMP
8R
D/A
CONV.
D500
MC2858-T111
5C
NARROW
BUFFER
WIDE
AMP
8C
W/NI
D/A
CONV.
5C
SUM
AMP
BSHIFT PLLE
TX/RX EVLLD
8C
DTMO,
SPM TXD
TONE
AMPSW DT
NARROW CK
IC704
WIDE DO
NJM12904RB1 MICMT CE
8TC CL
8RC DTMO
SPLATTER
SBC TONE
FILTER
8C
INT MICKEY
RESET CM
POWER VOL
UL PTT
ENCA RXD
ENCB DI
XOUT
X701
L78-1427-05
D/A
8.000MHz
CONV.
BSHIFT
5C
Q702,Q703
2SC4919-S
Q303
IC2 Q10 D9,D10
RD00HVS1-T113 RA60H1317M231
UPB1509GV 2SC5108(Y)F HSC277
RF TX/RX
COMM DRIVE
DIVIDER SW AMP
AMP
5C 8C 8T 8R
8T
1st Local
185.950~223.9475MHz
16.8MHz
(K,M2,M3)
193.950~197.9475MHz
Q501
(M4)
2nd_Local
Q504
Q503
50.4MHz IC501
3SK318
UA31136L KTC4080E-P 49.95MHz
IF IF
MCF MIXER
AMP
DEMODULATOR
XF501
L71-0655-05
5C 8R
8R
RF BPF
TUNE
D505,D506
1SV325F
L72-1034-05
CF501
(WIDE)
450kHz
SW SW
D502
CF502 MC2858-T111
(NARROW)
L72-0999-05
IC705(1/8) IC709 IC705(7/8,8/8)
Q706 Q704,Q705
M62363FP-F BA10324AFV M62363FP-F
2SC2412K 2SK3019
D/A
AF
MUTE
HPF
CONV.
FILTER SW
DTMF
8C AFM
5C 8C DTMFIN
5M
TEMP1
TEMP2
RSSI
MCU
SQIN
DTMFIN
RT1N141U-T111
IC707
30622MEP540GU
RT1N141U-T111
XIN
OVER
VOLTAGE
EEPSDT DETECT
EEPCK
5M
EEPWP
INT SW FB
EEPROM
Q707
SW
RT1N141U-T111
IC708
D712
EX24064ASAS0A
UDZW18(B)
RX: 136.000~173.9975MHz (K,M2,M3)
D306,D307
144.000~147.9975MHz (M4)
L407CDB
TX: 136.000~173.9975MHz (M2,M3)
IC302
D309,D311
144.000~147.9975MHz (K,M4)
JDP2S12CR
POWER
ANT SW LPF
MODULE
8T
+B
Vgg
D313,D314
HSB88AS-E
POWER
DETECTOR
APC
IC303
NJM12904RB1
8T
TH702,TH703
NCP18WF104J03
TEMP. TEMP1
DETECTOR TEMP2
Q505
3SK294-FP
BPF LNA BPF
Q506
2SK1830F
8R
SW
D508,D509
RF BPF
TUNE 1SV325F
IC705(2/8)
IC706(4/4)
M62363FP-F BA10324AFV
DC
D/A
CONV. AMP
5C 8C
IC715
Q712
LA4600
DTC363EU
BSB
D/A MUTE
AF AMP
CONV.
SW
5C
SPM
5C
SPOUT
AMPSW SW
SPGND
Q715
RT1N141U-T111
8C
BSB FB
IC711 Q714
Q711
TA7808F-NQ 2SJ645 F701
2SB1694
F53-0327-15
AVR
8T
SW SW FUSE
8V
Q709
8TC
SW SBC SW INT INT
Q710
Q713 IC712
2SB1694
RT1N141U-T111 XC61CN4002MR
8R
SW
Q708
AVR
5M
8RC 5V
SW
IC713
TA7805F-NQ
AVR
5C
RESET RESET
5V
IC710
IC714
XC6209B502P-G
XC61CN3202MR
ANT
EXT
SP
+B
E