Kenwood TM-631A Service Manual page 20

TM-631A
DESCRIPTION
OF
ELEMENTS
Components
Use/Function
Operation/Condition/Compatibility
Turns ON
when squelch function
is turned
OFF with RC-10
o9
06 1c3
Squelch OFF switch
SOL
vR
Q7
Balance volume switch Turns
ON in
single operation
Turns OFF
in
single operation
8c
8c
Q7
o8
Q8
Balance volume switch
BAL
R22
INH
Turns OFF when
the 8
V
line
shows below
the
rated
value when the power
is
turned ON/OFF.
INTO
Q101
Backup switch
8V
Turns ON during 3 ms
when
the
power
is
turned ON. Normally OFF.
RESET
Q102 Reset switch
gvC123
QIOZ
D1
LB
AVR
reference
11
V Zener
diode
D2 LB
AVR
reference
in
dimmer mode
8.2 V
Zener diode
D101
Reverse current protection
lithium battery
Lithium battery turns ON when the
power
is
turned OFF.
select
Reverse current protection, microcomputer
D102
protection
D103
Reverse current protection
D104
Microcomputer protection
D105
Voltage drop
7
V Zener diode
for
back
up
switch circuit.
(pin
19
TM-631A
DESCRIPTION
OF
ELEMENTS
Components
Use/Function
Operation/Condition/Compatibility
Turns ON
when squelch function
is turned
OFF with RC-10
o9
06 1c3
Squelch OFF switch
SOL
vR
Q7
Balance volume switch Turns
ON in
single operation
Turns OFF
in
single operation
8c
8c
Q7
o8
Q8
Balance volume switch
BAL
R22
INH
Turns OFF when
the 8
V
line
shows below
the
rated
value when the power
is
turned ON/OFF.
INTO
Q101
Backup switch
8V
Turns ON during 3 ms
when
the
power
is
turned ON. Normally OFF.
RESET
Q102 Reset switch
gvC123
QIOZ
D1
LB
AVR
reference
11
V Zener
diode
D2 LB
AVR
reference
in
dimmer mode
8.2 V
Zener diode
D101
Reverse current protection
lithium battery
Lithium battery turns ON when the
power
is
turned OFF.
select
Reverse current protection, microcomputer
D102
protection
D103
Reverse current protection
D104
Microcomputer protection
D105
Voltage drop
7
V Zener diode
for
back
up
switch circuit.
(pin
19