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Hytera
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MD78X
Hytera MD78X Service Manual
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V
HF
(
1
36
MH
z
–
174
MH
z
)
S
pe
c
i
f
i
c
at
i
ons
and
B
l
i
nd
S
pot
11
TT
FF
(
T
i
m
e
To
F
i
r
s
t
F
ix
)
Ho
t
S
ta
r
t
<
10s
H
or
i
z
ont
al
A
c
c
ur
a
c
y
<
10
m
N
o
te
A
l
l
S
pec
i
f
i
c
at
i
on
s
ar
e
t
es
t
e
d
ac
c
or
d
i
n
g
t
o
app
l
i
c
ab
l
e
s
t
and
ar
ds
,
and
s
ubj
ec
t
t
o
c
han
ge
w
i
t
ho
ut
not
i
c
e
due
t
o
c
ont
i
nu
ous
dev
e
l
op
m
e
nt
.
4.
2
B
l
i
nd
S
po
t
N
o.
B
l
i
nd
Sp
ot
(
M
H
z
)
N
o.
B
l
i
nd
Sp
ot
(
M
H
z
)
1
153.
6
3
144
2
172.
8
4
162
426
428
Table of Contents
Uhf1 (400-470 Mhz)
6
Table of Contents
6
Product Controls
8
Disassembly and Reassembly
10
Disassembling the Radio
10
Reassembling the Radio
11
Exploded View and Packing Guide
12
Exploded View
12
Packing Guide
14
Specifications and Blind Spot
15
Specifications
15
Blind Spot
18
Circuit Description
19
Front Panel
19
Baseband
21
Power Supply Module
21
Control Module
22
Audio Module
28
PCB Difference
29
RF Section
30
Transmitter Circuit
30
Receiver Circuit
33
FGU Circuit
34
GPS Circuit Section
36
Troubleshooting Flow Chart
37
Control Circuit
37
GPS Circuit
38
TX Circuit
39
RX Circuit
40
Frequency Generation Unit (FGU)
42
Interface Definition
44
10-Pin Connector
44
DB26 Accessory Interface
46
Other Interfaces
49
Tuning Description
57
Required Test Instruments
57
Tuning Procedures
57
Tuning the Radio
57
Testing the Radio
60
PCB View
62
Block Diagram
66
Schematic Diagram
69
Parts List
83
Front Panel
83
GPS Circuit
84
Main Board (25 W)
84
Main Board (45 W)
97
Uhf2 (450-520 Mhz)
112
Product Controls
114
Disassembling the Radio
116
Disassembly and Reassembly
116
Reassembling the Radio
117
Exploded View
118
Exploded View and Packing Guide
118
Packing Guide
120
Specifications
121
Specifications and Blind Spot
121
Blind Spot
124
Circuit Description
125
Front Panel
125
Baseband
127
Power Supply Module
127
Control Module
128
Audio Module
134
PCB Difference
135
RF Section
136
Transmitter Circuit
136
Receiver Circuit
139
FGU Circuit
140
GPS Circuit Section
142
Control Circuit
143
Troubleshooting Flow Chart
143
GPS Circuit
144
TX Circuit
145
RX Circuit
146
Frequency Generation Unit (FGU)
148
10-Pin Connector
150
Interface Definition
150
DB26 Accessory Interface
152
Other Interfaces
155
Required Test Instruments
162
Tuning Description
162
Tuning Procedures
162
Tuning the Radio
162
Testing the Radio
165
PCB View
167
Block Diagram
171
Schematic Diagram
174
Front Panel
188
Parts List
188
GPS Circuit
189
Main Board (25 W)
189
Main Board (45 W)
202
Uhf3 (350-400 Mhz)
217
Product Controls
219
Disassembling the Radio
221
Disassembly and Reassembly
221
Reassembling the Radio
222
Exploded View
223
Exploded View and Packing Guide
223
Packing Guide
225
Specifications
226
Specifications and Blind Spot
226
Blind Spot
229
Circuit Description
230
Front Panel
230
Baseband
232
Power Supply Module
232
Control Module
233
Audio Module
239
PCB Difference
240
RF Section
241
Transmitter Circuit
241
Receiver Circuit
244
FGU Circuit
245
GPS Circuit Section
247
Control Circuit
248
Troubleshooting Flow Chart
248
GPS Circuit
249
TX Circuit
250
RX Circuit
251
Frequency Generation Unit (FGU)
253
10-Pin Connector
255
Interface Definition
255
DB26 Accessory Interface
257
Other Interfaces
260
Required Test Instruments
267
Tuning Description
267
Tuning Procedures
267
Tuning the Radio
267
Testing the Radio
270
PCB View
272
Schematic Diagram
279
Front Panel
293
Parts List
293
GPS Circuit
294
Main Board (25 W)
294
Main Board (45 W)
294
Uhf5 (806-941 Mhz)
322
Product Controls
324
Disassembling the Radio
326
Disassembly and Reassembly
326
Reassembling the Radio
327
Exploded View
328
Exploded View and Packing Guide
328
Packing Guide
330
Specifications
331
Specifications and Blind Spot
331
Blind Spot
334
Circuit Description
335
Front Panel
335
Power Supply Module
337
Control Module
338
Audio Module
345
RF Section
346
Transmitter Circuit
346
Receiver Circuit
348
FGU Circuit
349
GPS Circuit Section
351
Control Circuit
352
Troubleshooting Flow Chart
352
GPS Circuit
353
TX Circuit
354
RX Circuit
355
Frequency Generation Unit (FGU)
356
10-Pin Connector
358
Interface Definition
358
DB26 Accessory Interface
360
Other Interfaces
364
Required Test Instruments
371
Tuning Description
371
Tuning Procedures
371
Tuning the Radio
371
Testing the Radio
374
PCB View
376
Block Diagram
380
Schematic Diagram
383
Front Panel
398
Parts List
398
GPS Circuit
399
Main Board
399
Vhf (136 - 174 Mhz)
415
Product Controls
417
Disassembling the Radio
419
Disassembly and Reassembly
419
Reassembling the Radio
420
Exploded View
421
Exploded View and Packing Guide
421
Packing Guide
423
Specification
424
Specifications and Blind Spot
424
Blind Spot
427
Circuit Description
428
Front Panel
428
Baseband
430
Power Supply Module
430
Control Module
431
Audio Module
437
RF Section
438
Transmitter Circuit
438
Receiver Circuit
441
FGU Circuit
442
GPS Circuit
444
Control Circuit
445
Troubleshooting Flow Chart
445
GPS Circuit
446
TX Circuit
447
RX Circuit
448
Frequency Generation Unit (FGU)
449
10-PIN Connector
451
Interface Definition
451
DB26 Accessory Interface
453
Other Interfaces
457
Required Test Instruments
463
Tuning Description
463
Tuning Procedures
463
Tuning the Radio
463
Testing the Radio
466
PCB View
468
Block Diagram
472
Schematic Diagram
475
Front Panel
489
Parts List
489
GPS Circuit
490
Main Board (25W)
490
Main Board (50W)
504
Other manuals for Hytera MD78X
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36 pages
User Manual
27 pages
4
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Hytera MD78X Specifications
General
Brand
Hytera
Model
MD78X
Category
Radio
Language
English
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