HYT TC-780 Service Manual page 101

5
VOL_OUT
R305 R305 R220 R220
D
1k 1k 4.7k 4.7k
TONEO
ALT
C290 1u C290 1u
VOL_IN
R205 R205
1k 1k
AF_MUTE
R216 R216 R217 R217
4.7k 4.7k 10k 10k
TONEO
C213 C213
0.01uF 0.01uF
C
MOD
R260 R260 C252 C252
390k 390k 1uF 1uF
R258 R258
15k 15k
R259 R259
22k 22k
CTC_OUT
R257 R257
C250 C250 C251 C251 100k 100k
0.015uF 0.015uF 0.018uF 0.018uF
C248 C248
1u 1u
C249 C249 R256 R256 R304 R304
1800p 1800p 27k 27k 22k 22k
R254 R254
6.8k 6.8k Q203 Q203
2SK1824 2SK1824
N_CON
B
AF_TCLK
AF_TDATA
AF_DIO
AF_RDF
AF_SCK
AF_DIR
VOX
MIC_MUTE
TI
R286 R286
1k 1k
TONE_IN
R287 R287 R284 R284
10k 10k 10k 10k
R283 R283 R282 R282
150k 150k 150k 150k
R5V
C273 C273
1000pF 1000pF
A
5
4
TC-780 VHF Schematic Diagram (Baseband Unit)
Baseband Circuit of Main Board
R290 R290 C216 C216
10k 10k 0.1uF 0.1uF
C280 C280 C281 C281
0.01uF 0.01uF 4700p 4700p
R206 R206
8.2k 8.2k
C277 C277 R301 R301 R302 R302
Q204 Q204 C278 C278
0.1uF 0.1uF 15k 15k 22k 22k
2SK1824 2SK1824 0.01uF 0.01uF
C289 C289
1u 1u
C276 C276 C291 C291 C292 C292
TXL_IN
470p 470p 0.015uF 0.015uF 0.018uF 0.018uF
C215 C215
R219 R219 0.1uF 0.1uF C219 C219 R222 R222
10k 10k C282 C282 1u 1u 1u 1u 33k 33k
FLAT_IN
TXAF_DI
C214 C214 R218 R218 R221 R221 R293 R293 C275 C275
4700p 4700p 47k 47k 15k 15k 18k 18k 1u 1u
R295 R295
22k 22k
C274 C274 + + R224 R224
N_CON
100k 100k
R307 R307 4.7u/6.3V 4.7u/6.3V
6.8k 6.8k Q206 Q206 C222 C222
C284 C284 2SK1824 2SK1824 1000pF 1000pF
0 0
AFDET
C218 C218
0.47uF 0.47uF
R246 R246 C241 C241
R288 R288 10k 10k 2200p 2200p
82k 82k
RP201 RP201 C243 C243
68K 68K 1u 1u
R247 R247 R248 R248
330k 330k 10k 10k
U203 U203
AK2346 AK2346
MOD1
R289 R289
1
AGNDIN
120k 120k C242 C242
2
AGND
33p 33p
3
TXAF_OUT TXIN
4
TXINO
5
LIMLV
R253 R253 R250 R250 R249 R249
6
EXTLIMIX
51k 51k 27k 27k
7
MOD
8
VSS
18k 18k
9
TCLK
10
TDATA
R252 R252 C247 C247
11
DI/O
0 0 1u 1u R251 R251
12
RDF/FC
33k 33k
C246 C246 C245 C245
+ +
C5V 0.1uF 0.1uF 15u/6.3V 15u/6.3V
R280 R280 C268 C268 C267 C267
10k 10k 0.1uF 0.1uF 0.01uF 0.01uF
R279 R279
U206 U206 4.7k 4.7k
TC75W51FU TC75W51FU
R285 R285 C298 C298
1 8
OUT OUT Vdd Vdd
1M 1M C266 C266 1u 1u
- + - +
2 7 5600p 5600p
OUT OUT
IN- IN- R277 10k R277 10k C265 C265
3 6
IN- IN-
+ - + -
IN+ IN+ 0.1uF 0.1uF C299 C299
4 5 1u 1u
IN+ IN+
Vss Vss
R278 R278
C272 C272 22k 22k
0.01uF 0.01uF C269 C269 R276 R276
C271 C271 C270 C270 22k 22k
+ +
4.7u/6.3V 4.7u/6.3V 1000pF 1000pF NC NC C307 C307
0.1uF 0.1uF
R281 R281
5T_F
100k 100k
SDATA
R275 R275
100k 100k
AF_SCK
CSN
4
3
R204 R204 R207 R207 R208 R208
100 100 NC NC 1k 1k R210 R210
0 0
R209 R209
1k 1k
RXAF_DI
C208 C208
4.7u/6.3V 4.7u/6.3V
R245 R245
0 0
R223 R223
68k 68k
C5V
U201 U201 C220 C220
C221 47p C221 47p TC75W51FU TC75W51FU 1000pF 1000pF
1 8
OUT OUT
Vdd Vdd
- + - +
2 OUT OUT 7
IN- IN-
3 6
IN- IN-
+ - + -
IN+ IN+
R225 R225 4 5
IN+ IN+
Vss Vss
100k 100k R227 R227 C224 C224
82k 82k NC NC R235 R235
10k 10k
R303 R303
C223 C223 R226 R226 0 0
C5V
1u 1u 33k 33k
C225 C225
R229 R229 0.47uF 0.47uF
10k 10k
R244 R244
0 0
TXAF_DO
C227 C227
560p 560p C201 C201
R228 R228
68k 68k 0.47uF 0.47uF
C244 C244 R230 R230 R231 R231
+ +
1u 1u 10k 10k 100k 100k
RXAF_IN
C226 C226
33p 33p
24
TEST
23
RXIN
22
RXINO
21
RXLPFO
20 C260 C260
RXAF
0.027uF 0.027uF
19
RXAFIN
C261 C261 R272 R272
18
EXPOUT
17 R271 R271 150p 150p 56k 56k
VDD
56k 56k
16
XIN
D205 D205
15
XOUT
C279 C279 C262 C262 MA2S111 MA2S111
14
DIR
C263 C263 0.1uF 0.1uF 0.1uF 0.1uF
13
SCLK
22p 22p
R274 R274 X202 X202
R273 R273 1M 1M 3.6864MHz 3.6864MHz R270 R270
100k 100k 10k 10k
C264 C264
22p 22p
R311 R311
0 0
R310 R310 C306 C306
C301 C301 10k 10k
560p 560p
0.1uF 0.1uF
R309 R309 R308 R308
10k 10k 100k 100k
U208 U208
AK2346 AK2346 C300 C300
33p 33p R269 R269
1 24
AGNDIN TEST
2 23 C305 C305 100k 100k
AGND RXIN
0.01u 0.01u
3 22
TXIN RXINO
4 21
TXINO RXLPFO
5 20
5T_F
LIMLV RXAF
6 19
EXTLIMIX RXAFIN
C5V
7 18
MOD EXPOUT
8 17
VSS VDD R313 R313
9 16
TCLK XIN
10 15 1M 1M
TDATA XOUT
11 14
DI/O DIR
12 13
RDF/FC SCLK
+ + C304 C304
1u/6.3V 1u/6.3V
99
3
2
5CNS
R211 R211 R212 R212 C209 C209
NC NC 33k 33k 0.1uF 0.1uF
U202 U202
BU8872FS BU8872FS
R213 R213 C207 C207
1 16
INPUT Vdd
22k 22k 0.047uF 0.047uF
2 15
NC NC
3 14
OSCOUT ESt
4 13
NC NC
5 12
NC NC
6 11
OSCIN ACK
7 10
NC NC
8 9
GND SD
C211 C211 X201 X201
15p 15p 4.194304M 4.194304M
C210 C210
15p 15p
R238 R238
D202 D202 C234 C234 R239 R239 27k 27k
R241 R241 C236 C236 RB706F-40 RB706F-40 C235 C235 R255 R255 47p 47p
100k 100k 0.22uF 0.22uF R240 R240 1u 1u 27k 27k 1M 1M
0 0
R234 R234 C230 C230 U204 U204 C239 C239
4.7k 4.7k 0.033uF 0.033uF TC75W51FU TC75W51FU 0.1uF 0.1uF
1 8
OUT OUT Vdd Vdd
- + - +
2 7
OUT OUT
C229 C229 R233 R233 IN- IN-
3 6
IN- IN-
+ - + -
IN+ IN+
47p 47p 150k 150k
4 IN+ IN+ 5
Vss Vss
R236 R236 R237 R237 R243 R243
100 100 100 100 15k 15k
R300 R300
C288 C288
10k 10k 1u 1u
D206 D206 R296 R296
RB706F-40 RB706F-40 1k 1k
Q207 Q207
2SC4738F 2SC4738F
C232 C232 R298 R298
1u 1u C286 C286 100K 100K
1u 1u
D203 D203 R306 R306
C231 C231 RB706F-40 RB706F-40 C287 C287 100K 100K
1u 1u 1u 1u
Q208 Q208
R297 R297 2SA1832 2SA1832
2.7k 2.7k
R261 R261
0 0
R267 R267
82k 82k
R262 R262
22k 22k
R266 R266 C256 C256 R265 R265
C257 C257 390k 390k 0.039uF 0.039uF 100k 100k
220p 220p D204 D204
U205 U205 MA3J742 MA3J742
TC75W51FU TC75W51FU
1 8
OUT OUT Vdd Vdd
- + - +
2 7
OUT OUT
IN- IN- R263 R263
3 6
IN- IN-
+ - + -
IN+ IN+
C254 C254 180k 180k
0.012uF 0.012uF
4 IN+ IN+ 5
Vss Vss
R268 R268 + +
100k 100k C259 C259 C258 C258
4.7u/6.3V 4.7u/6.3V 0.01uF 0.01uF R264 R264
180k 180k
C296 C296
2200p 2200p
R5V
2
1
AUDIO_AMP
C255 C255
1u 1u
R214 R214
33k 33k
DTMF_EST
C212 C212
0.22uF 0.22uF
R215 R215
1k 1k
DTMF_ACK
DTMF_SD
C233 C233
0.022uF 0.022uF
MIC
5CNS
C238 C238
1000pF 1000pF C228 C228
0.022uF 0.022uF
R242 R242
18k 18k
C237 C237 R232 R232
C240 C240 470p 470p 4.7k 4.7k
0.1uF 0.1uF
R299 R299
NC NC
C294 C294
1uF 1uF
RXAF_DO
C295 C295
1uF 1uF
FLAT_OUT
C253 C253
0.068uF 0.068uF
1
D
C
B
A