Kenwood UBZ-LJ8 Service Manual page 29

F
TX-RX UNIT : CONTROL SECTION (X57-6672-70) (A/2)
3T
3C
3R
CTCSS_IN
LOW PASS FILTER
IC211
NJM2100V
1.461V 8
1
AOUT
V+
7
2
A-IN
BOUTPUT
1.451V 3 6
A+IN
B-INPUT
5
4
V-
B+INPUT
R285 R284
R286
100k
120k 15k
3MS
IC202 :BD4724G IC208
IC203 :LM4865M IC209
IC204 :TC75S51F IC210
IC206 :BD4730G
IC207 :TK71530ASCL IC211
G
SCHEMATIC DIAGRAM
SP.ON :4.5V
SP.OFF :4.5V
INT.ON :4.5V AF
INT.OFF:4.5V AMPLIFIER
EXT. :4.49V AVR
Q216
2SA1362(GR)
SP.ON :2.944V
SP.OFF :0.004V
INT.ON :2.945V
INT.OFF:2.944V
EXT. :2.946V
BTL_OUT
SP_AMP
Q220
2SC4617(S)
D209,210
AF SWITCH
VOLTAGE LEVEL
SHIFT DIODE
SP_MUT
R273 R272
4.7k 4.7k
CTCSS_OUT
R318
10k
BEEP
R279
C224 68p
82k
R224 560k
4 3
1.451V
OUT
IN(-)
2
VSS
5 1
2.902V
VDD
IN(+)
IC204
TC75S51F
MIC AMPLIFIER
TONE SIGNAL DETECTION
D204
MA742
C222
0.1u
R229
3900p
22k
180k
1.041V
C226
0.022u Q201
2SC4738(GR)
VOX AMPLIFIER
:M38C24M6502HP Q200
:AK2346 Q201
:AT24C01A10SI18 Q210-212,215
or CAT24WC01JI18 Q213
:NJM2100V Q216
Q217,218
H
SP.ON :3.647V
SP.OFF :0.014V
INT.ON :3.647V
R298
INT.OFF:3.647V
AF AMPLIFIER
47k
EXT. :3.633V
IC203
LM4865M
TONE SIGNAL DETECTION
1 8
VCC VO2
C201
2 7
-VIN BYPASS
3 6
0.01u
HP_SEN GND
5
4
DC_VOL/SW VO 1
R299
10
C292
0.1u
SP.ON :2.964V
SP.OFF :2.963V
INT.ON :0.018V
INT.OFF:2.964V
EXT. :0.019V
R271
22k
BUSY
3C
PLL_UNLOCK
COMM_CLK
3T
COMM_DATA
3R
PLL_CS
RSSI
R291
10k
R221
R220
1.8k
470
C220
10u
10
R223 C290 R222
1k 0.1u 18k
MIC MUTE DIODE
D202
Q200
DAN222
2SC4919
R228
R227
10k
0
MIC MUTE SWITCH
TONE SIGNAL DETECTION
C295
D203
1.087V
MA742
R230
C228
0.1u
0.478V
:2SC4919 Q219 :2SK1824
:2SC4738(GR) Q220 :2SC4617(S)
:DTA123JE
:DTC114EE
:2SC1362(GR)
:CPH3413
I
UBZ-LJ8
NOTES: BTL NORMAL EXT
BTL_OUT 0 0 1
SP_MUT 0 1 0
(WHEN BTL_IN =LOW, SWITCH TO EXT MODE)
D208
MA742 SP.ON :0.004V
Q217
SP.OFF :0.003V
CPH3413
INT.ON :6.58V
INT.OFF:0.004V
EXT. :5.77V
R293
Q217-219
390k
AF SWITCH
Q218
Q219 CPH3413
2SK1824
SP.ON :2.858V
SP.OFF :2.858V
INT.ON :0.025V
R315
330k INT.OFF:2.858V
EXT. :0.007V
R320
82
R294
F200
BATT F53-0217-05
4.5V
D200
1SR154-400
PROTECTION
DIODE
MOD
GND
TO
GND
BUSY
GND
3C
GND
UL
GND
CK
DT
EP
CRS
AFO
470p
R241
330
C221
R243
0.1u
100
R295
R242
10k
330
PROTECTION
DIODE
MODE_KEY
PTT
R233
0
WRITE
FLASH
REM(TxD)
RxD
R297
PTT
100
D200 :1SR154-400
D202 :DAN222
D203,204,208 :MA742
D205 :B30-2143-05
D206 :KDZ3.3V
D209,210 :MA2S111
J
MUT
1
1
INTERNAL
SPEAKER
AF VR
0
BATT
CN200
2 1
3T
3R
B
B
B
20 19
MIC200
C209
J200
PTT
1
MIC
SPG
REM
AFO
27
X57-667 2/4