Kenwood UBZ-LJ8 Service Manual
A
1.01V
1.304V
1.437V
1.451V
RX:0V
TX:2.468V
RX:2.83V
TX:2.83V
RX:2.872V
TX:0.621V
RX:2.944V
TX:0.082V
RX:2.89V
TX:2.893V
RX:0.071V
TX:0.082V
RX:0.073V
TX:2.948V
RX:0.072V
TX:0.083V
2.95V
LAMP
ON:0.079V
LAMP
OFF:3.025V
LAMP
ON:2.229V
LAMP OFF:4.5V
LAMP ON:4.49V
LAMP OFF:4.5V
2.893V
2.927V
B
C
UBZ-LJ8 SCHEMATIC DIAGRAM
TX-RX UNIT :CONTROL SECTION (X57-6672-70) (A/2)
1
COM2
COM1
COM0
S15
S14
S13
AVR
IC207
TK71530ASCL
2
VIN1VOUT
GND
3
R240
390k
R239
270k
470p
C240
3M
1u
C305
5
VCC
IC202
BD4724G
VEE13VEE2
1NC2
VOLTAGE DETECTION
R235
4
OUT
47k
2.927V
C239
0.01u
2
3
LAMP ON:4.49V
LAMP OFF:4.5V
LAMP
ON:2.229V
LAMP OFF:4.5V
LAMP LED
B30-2143-05
LAMP
ON:0.079V
LAMP
OFF:3.025V
LAMP LED SWITCH
Q213
DTC114EE
S1S2S3
D205
S6
S7S0S8
S4
S5
R238
180
R234
470p
C306
4
5
VCC
IC206
BD4730G
VEE1
1NC2
3
VOLTAGE DETECTION
2.893V
OUT
VEE2
220k
S9
C238
S10
0.01u
S11
S12
2.95V
C236
C237
47u4
3M
470p
3R SWITCH
RX:0.073V
TX:2.948V
3MS SWITCH
RX:0.072V
TX:0.083V
D
Q211
DTA123JE
3C SWITCH
RX:0.071V
TX:0.082V
C_3MS
3T SWITCH
RX:2.944V
TX:0.082V
C_3R
Q212
DTA123JE
C_3C
Q215
DTA123JE
C_3T
Q210
RX:0V
TX:2.468V
RX:2.83V
TX:2.83V
DTA123JE
RX:2.872V
TX:0.621V
RX:2.89V
TX:2.893V
E
3T
1u
470p
C302
C233
3C
470p
C301
C279 1u
3R
470p
C300
C235 1u
3MS
1u
C234
4
5
6
7
C_3MS
C_3T
C_3R
C_3C
COMM_CLK
COMM_DATA
AKM_DIR
PLL_CS
PLL_UNLOCK
UP_KEY
DOWN_KEY
CTCSS_OUT
BEEP
MIC_MUT
CTCSS_IN
26
X57-667 1/4
49
50
51
52
53
54
55
1k
R248
R249
WRITE
56
1k
57
58
59
60
61
47k
R312
62
63
64
POWER
10k
R303
3.9k
R247
POWER PTT UP DOWN MODE
S0S1S2S3S4S5S6S7S8
44
45
46
47
48
3TC
3RC
3MC
SAVE
CLK
DAT
AKDIR
PLLE
UL
UP
DOWN
QTOUT
BEEP
MICM
BATTL
GND
VREF
BATT
QTIN
S200
S70-0434-05
LAMP
BUSY
RSSI
REM
VOX
123456789
BUSY
C307
PTT
TUNE
RSSI
R308
1u
R296
2.2k
WRITE
REM
VOX
UP_KEY
DOWN_KEY
41
42
43
S2S1S0
MPU
IC208
M38C24M6502HP
OSCO
FLASH (GND)
RESET
1k
FLASH
R304 10k
MODE_KEY
37
38
39
40
SPM
SP AMP
GND
Xin
10111213141516
SP_AMP
SP_MUT
R305 10k
R306 10k
R307 10k
1.304V
15p
C243
S9
35
36
S9S8S7S6S5S4S3
Xout
Vcc
C246
100
R253
X201
L77-1928-05
or
L77-1929-05
3.633MHz
34
470p
S10
S10
MJDET
BTL_IN
S11
33
S11
COM0
COM1
COM2
MODE
PWR
ESCL
ESDA
BTLC
BTL_OUT
C254
C247
120p
R263
150k
R262
39k
R265
1u
33k
1.437V
R261 680k
C253
2200p
C251
R256
0.1u
4.7k
32
S12
31
S13
30
S14
29
S15
28
NC
27
26
25
24
NC
R251
23
1k
22
PTT
21
TxD
20
RxD
R250
19
18
1k
17
1u
C245
R290
1.01V
15p
C244
R300 1k
R301 1k
R302 1k
MODE_KEY
REM(TxD)
0
COM0
COM1
COM2
PTT
RxD
POWER
S12
S13
S14
S15
C263
1800p
C258 1u
8.2k
R267
C259 1u
R266
270k
C261
0
R270
C265
0.1u
1.451V
33k
R275
C264
3M
C286
8200p
8
7
0.1u
6
5
R310 47k
R311 47k
1
2
3
4
5
120p
6
R269
7
3.9k
8
9
10
11
12
4.7k
R314
COMM_DATA
EEPROM
IC210
CAT24WC01JI18
or
AT24C01A10SI18
VCC
WP
SCL
SDA
VSS
BASEBAND IC
IC209
AK2346
AGNDIN
AGND
TXIN
TXINo
RXLPFo
LIMLV
EXTLIMIN
RXAFIN
MOD
EXPOUT
VSS
TCLK
TDATA
D_IO
RDF_FC
1
A0
2
A1
3
A2
4
TEST
RXIN
RXINo
RXAF
VDD
XIN
XOUT
DIR
SCLK
3MS
24
23
22
21
20
19
18
17
16
15
14
13
1u
C255
33k
R264
C252
0.01u
COMM_CLK
AKM_DIR
F
G
TX-RX UNIT : CONTROL SECTION (X57-6672-70) (A/2)
SP.ON :4.5V
SP.OFF :4.5V
INT.ON :4.5V
INT.OFF:4.5V
EXT. :4.49V
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)
SP_MUT
CTCSS_OUT
BEEP
1.451V
2.902V
AF SWITCH
4
5
0.022u
1.451V
150k
R288
C276
680p
R287
100k
0.056u
C277
1.461V
3MS
3T
3C
3R
R286
100k
LOW PASS FILTER
IC211
NJM2100V
1
AOUT
2
A-IN
BOUTPUT
3
A+IN
B-INPUT
4
V-
B+INPUT
R285
120k
C275
0.022u
C273
CTCSS_IN
V+
R284
15k
0.047u
15k
R278
8
R279
7
82k
6
5
33k
0.047u
R281
C272
H
I
SCHEMATIC DIAGRAM UBZ-LJ8
EXTBTLNOTES:
AF
AMPLIFIER
AVR
Q216
2SA1362(GR)
2.7k
R321
1k
R316
R273
4.7k
0.1u
C267
R318
10k
5.6k
R292
68p
C224
R224
560k
OUT
IN(-)
VSS
VDD
IN(+)
IC204
TC75S51F
MIC AMPLIFIER
D204
MA742
C222
0.1u
R229
22k
1.041V
C226
2SC4738(GR)
VOX AMPLIFIER
SP.ON :3.647V
SP.OFF :0.014V
INT.ON :3.647V
INT.OFF:3.647V
EXT. :3.633V
C211
D209
MA2S111
D210
D209,210
VOLTAGE LEVEL
SHIFT DIODE
R272
4.7k
0.1u
C266
C288
1000p
3
2
1
R227
C295
3900p
R230
180k
Q201
470p
MA2S111
R274
R291
10k
0
1.2k
C225
R231
C212
10u10
R271
5.6k
22k
4
2.2u
R319
C249
C248
R257
MIC MUTE DIODETONE SIGNAL DETECTION
1.087V
1
2
3
4
22k
0.047u
0.047u
47k
D202
DAN222
MIC_MUT
0.478V
1u
C227
AF AMPLIFIER
IC203
LM4865M
VCC
BYPASS
-VIN
HP_SEN
DC_VOL/SW VO 1
C208
0.1u
3C
3T
3R
R228
10k
TONE SIGNAL DETECTION
C228
0.1u
8
VO2
C201
7
6
0.01u
GND
5
SP.ON :2.964V
SP.OFF :2.963V
INT.ON :0.018V
INT.OFF:2.964V
EXT. :0.019V
R220
470
Q200
2SC4919
MIC MUTE SWITCH
D203
MA742
R298
47k
TONE SIGNAL DETECTION
C294
0.01u
R299
10
C292
0.1u
BUSY
PLL_UNLOCK
COMM_CLK
COMM_DATA
PLL_CS
RSSI
R221
1.8k
C220
10u
10
C229
BTL_OUT
(WHEN BTL_IN =LOW, SWITCH TO EXT MODE)
D208
MA742
R293
390k
C293
2200p
Q219
2SK1824
R315
330k
R320
82
BATT
C221C290 R222R223
0.1u0.1u 18k1k
VOX
R233
0
1M
0.1u
R232
Q217
CPH3413
C304
C210
1000p
R295
10k
C241
470p
PROTECTION
DIODE
PTT
C303
0.01u
0.01u
F53-0217-05
D200
1SR154-400
PROTECTION
DIODE
D206
0
SP.ON :0.004V
SP.OFF :0.003V
INT.ON :6.58V
INT.OFF:0.004V
EXT. :5.77V
CPH3413
C299
KDZ3.3V
NORMAL
Q217-219
AF SWITCH
Q218
F200
R241
330
R243
100
R242
330
470p
REM
C242
470p
MODE_KEY
PTT
WRITE
FLASH
REM(TxD)
RxD
PTT
10
C206
100u6.3
SP.ON :2.858V
SP.OFF :2.858V
INT.ON :0.025V
INT.OFF:2.858V
EXT. :0.007V
4.5V
MOD
TO
BUSY
3C
UL
CK
DT
EP
CRS
AFO
5.6k
R289
C296
470p
C298
470p
C297
0
R317
R202
BTL_IN
R297
100
R294
MUT
0
GND
GND
GND
GND
GND
3T
3R
C209
470p
0.068u
100k
1
1SP_MUT 100
INTERNAL
SPEAKER
AF VR
CN200
2
1
B
B
B
19
20
PTT
1
MIC
SPG
REM
AFO
J
BATT
MIC200
J200
MPU FLASH-ROM
VR201
I/O PORT
IC202
IC203
IC204
IC206
IC207
:BD4724G
:LM4865M
:TC75S51F
:BD4730G
:TK71530ASCL
IC208
IC209
IC210
IC211
:M38C24M6502HP
:AK2346
:AT24C01A10SI18
or CAT24WC01JI18
:NJM2100V
Q200
Q201
Q210-212,215
Q213 :DTC114EE
Q216 :2SC1362(GR)
Q217,218 :CPH3413
:2SC4919
:2SC4738(GR)
:DTA123JE
Q219 :2SK1824
Q220 :2SC4617(S)
D200
D202
D203,204,208
D205
D206
D209,210 :MA2S111
:1SR154-400
:DAN222
:MA742
:B30-2143-05
:KDZ3.3V
27
X57-667 2/4
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