HYT Science and Technology Co TM-800U1 Mobile Radio User Manual

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Document ID	717659
Application ID	14danNES+X48WLH1FK2mKw==
Document Description	Users Manual I
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	24.38kB (304803 bits)
Date Submitted	2006-10-19 00:00:00
Date Available	2006-10-19 00:00:00
Creation Date	2006-10-16 20:45:06
Producing Software	Acrobat Distiller 6.0 (Windows)
Document Lastmod	2006-10-16 20:45:52
Document Title	untitled

TM-800 UHF SERVICE MANUAL
Troubleshooting Flow Charts
MCU
Check
Normal Power-on
alert tone?
Yes
RF circuit can’t
be driven
No
Replace the
speaker
Yes
Read available
or not?
Check the
control circuit
No
Speaker works
well?
Yes
9.8304MHz works
normally?
Yes
Yes
Q117 works
normally?
No
Replace
Q117
Yes
Pin10 is of
high level?
No
No
Check 5V
Yes
MCU works well
123
Check read
circuit
Reset
TM-800 UHF SERVICE MANUAL
VCO
Check
Normal power
supply?
No
Replace Q116
No
Q706 works
normal?
Yes
Rx oscillates ? And
CV voltage is
normal?
Yes
Q705 works
normal?
No
Yes
Replace Q706
Check Q703
outputs normally?
No
Yes
Check Q703
Yes
Normal
feedback?
No
Check Q124
Yes
16.8MHz
oscillates?
No
Check power
supply circuit.
Yes
Check CPU data
circuit.
124
No
Replace
Q705
TM-800 UHF SERVICE MANUAL
No receive
Power supply of AF
IC126 is normal?
No
Check power
supply circuit.
Yes
Output of IC126 is
normal?
Yes
FPC & Speaker
work normally?
No
Output of electronics
volume IC125 is
normal?
Yes
Check IC126
No
Output of IC104 is
normal?
Yes
Check IC125
No
Output of IC106 is
normal?
Yes
Check IC104
No
Output of IC121 is
normal?
Yes
Check IC106
No
The 2nd local oscillator
works normally?
No
Check X105
Yes
No
L135 works normally?
Replace L135
Yes
Is there any input in
IC119 PIN16 IF?
Yes
Check work status of
IC119 &peripheral
components
No
Yes
Is there any RF signal?
No
Check Q601 pass
125
Check VCO
TM-800 UHF SERVICE MANUAL
No output
Yes
Yes
Current is
normal?
No
Power supply
works normally?
No
Check power
supply circuit
Low
Check Q131 &
Q110
Control voltage is
normal?
High
Check transistor
Bias voltage and
low pass network
Check driver stage.
Repair
transmission
network.
Driver stage is
normal?
No
No
Check the suited
network.
Normal Power?
Yes
Yes
Normal power?
Completed
Completed
Replace Q128
Yes
Normal power?
Completed
No
Replace Q127
126
Yes
VCO maintenance
Flow chart
TM-800 UHF SERVICE MANUAL
Exploded View
41
40
39
38
10
37
11
36
12
35
13
34
14
15
33
16
32
17
31
18
19
30
20
29
28 27
26
25
24 23
127
22 21

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