Kenwood TM-631A Service Manual page 22
144/220mhz fm dual bander
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Also See for TM-631A:
- Instruction manual (37 pages) ,
- Instruction manual (36 pages) ,
- Instruction manual (36 pages)
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TM-631A
DESCRIPTION
OF
ELEMENTS
Components
Use/Function
Operation/Condition/Compatibility
Main band mute
Main band mute
when
ON
Q7
Q7
Sub
band mute
Sub
band mute
when
ON
08
Sub
band mute
(20
aB)
Sub
band mute by
20
dB
when
ON
Omu3
MU
2
7.6V
66V
Q9g
8v
R55
ag
PLL
8
X
ripple filter
de
Q10
Ripple filter
On
reception: When ON, turns
C13
ON by
8R,
Qu
and
grounds the mic
line.
H-
BR
011
PLL
modulation input mute
Le
MIC AMP
On
reception:
189.175~194.170
MHz
Q12
PLL output
amplifier
On
transmission:
220
~
224.995
MHz
220
MHz band: Turns
OFF when LOW POWER
is
activated.
Qi3
013
Low Power switch
IC4
7pin
LOW
ON
014,15
Radio-frequency amplifier
Operation
in
reception
220
~
224.995
MHz
Q16
Transmission
driver
Operation
in
reception
220
~224.995
MHz
DI~4
Varicap
tuning
D5
Reverse current protection
D6
S-meter detection
D7
Reverse current protection
D8
PLL output switch
Turns
ON on
reception
D9
Reverse current protection
D10
POWER
control temperature compensation
D11
Reverse current protection
D12
Idling of
Q16
D13
Idling of
Q17
Q6
Mu!
HI
Low
21
TM-631A
DESCRIPTION
OF
ELEMENTS
Components
Use/Function
Operation/Condition/Compatibility
Main band mute
Main band mute
when
ON
Q7
Q7
Sub
band mute
Sub
band mute
when
ON
08
Sub
band mute
(20
aB)
Sub
band mute by
20
dB
when
ON
Omu3
MU
2
7.6V
66V
Q9g
8v
R55
ag
PLL
8
X
ripple filter
de
Q10
Ripple filter
On
reception: When ON, turns
C13
ON by
8R,
Qu
and
grounds the mic
line.
H-
BR
011
PLL
modulation input mute
Le
MIC AMP
On
reception:
189.175~194.170
MHz
Q12
PLL output
amplifier
On
transmission:
220
~
224.995
MHz
220
MHz band: Turns
OFF when LOW POWER
is
activated.
Qi3
013
Low Power switch
IC4
7pin
LOW
ON
014,15
Radio-frequency amplifier
Operation
in
reception
220
~
224.995
MHz
Q16
Transmission
driver
Operation
in
reception
220
~224.995
MHz
DI~4
Varicap
tuning
D5
Reverse current protection
D6
S-meter detection
D7
Reverse current protection
D8
PLL output switch
Turns
ON on
reception
D9
Reverse current protection
D10
POWER
control temperature compensation
D11
Reverse current protection
D12
Idling of
Q16
D13
Idling of
Q17
Q6
Mu!
HI
Low
21
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