Control Unit (X57-5610-Xx) (B/3); Final Unit (X57-5610-Xx) (C/3); Description Of Components - Kenwood TK-790 Service Manual

Control Unit (X57-5610-XX) (B/3)

-10 : TK-790/(B) K -11 : TK-790(B) K2 -12 : TK-790H(B) K
Ref. No. Use/Function
IC501 D FF
IC502 LPF
IC503 AVR
IC504 Audio processor
IC505 HPF/IDC
IC506 AVR
IC508 Limiter/Buffer amplifier
IC509 Buffer amplifier
IC510 Summing amplifier/LPF
IC511 DTMF encoder
IC512 D/A converter
IC513 LPF/Summing amplifier
IC514 EEPROM
IC515 Analog switch
IC516 CPU
IC517 Shift register
IC518 Buffer amplifier
IC519 Flash ROM
IC520 NOR gate
IC521 Buffer amplifier/
Amplifier
IC522 Audio power amplifier
IC523 Shift register
IC524 Buffer amplifier/
De-emphasis
IC525 DTMF decoder
IC526 Compander amplifier
Q501 DC switch
Q502 DC switch
Q503 DC switch
Q504 Muting switch
Q505 DC switch
Q506,507 DC switch
Q509 DC switch
Q510 DC switch
Q511 DC switch
Q512 DC switch
Q513 DC switch
Q514 Muting switch
Q516,517 DC switch
Q518 DC switch
Q519 Power switch
Q520 DC switch
Q522 Beat shift switch

DESCRIPTION OF COMPONENTS

Operation/Condition
Input : SB, Output : 8V
Input : 8V, Output : 5V
On when 18V or more
On when the power switch on
MIC mute
Timed power off switch
Off when P/A
Off when EXT SP
Off when INT SP
Off when RX busy
On when AF mute
On when on signalling code
On when push the power switch
On when the power switch on
On when horn alert
On when beat shift
TK-790/
Ref. No. Use/Function
Q523 DC switch
Q524 DC switch
Q525 DC switch
Q526,527 DC switch
Q528,529 DC switch
Q530~532 DC switch
Q533~540 DC switch
Q541 DC switch
Q542,543 DC switch
Q544 DC switch
D501 Voltage reference
D502 Reverse current
prevention
D503 Surge absorption
D504 Voltage reference
D505,506 DC switch
D507 Voltage reference
D508 DCswitch
D511 DC switch
D512 Reverse current
prevention
D513~517 Surge absorption
D519 Surge absorption
D521 Surge absorption
D523,524 Surge absorption
D526,527 Surge absorption
D528,529 Reverse current
prevention

Final Unit (X57-5610-XX) (C/3)

-10 : TK-790/(B) K -11 : TK-790(B) K2
Ref. No. Use/Function
Q1 DC amplifier
Q2 APC controller
Q3,4 DC switch
Q5 APC comparator
Q6 DC switch
D1 Protection of
reverse connection
D2 Surge absorption
D3,4 ANT switch
D5 Forward wave
rectification
D6 Reflected wave
rectification
( B ) /H (
Operation/Condition
Serial data inverter
Serial data transmitter
On when compander on
On when compander off
On when compander on
On when output port on
On when timed power off
IGN switch
Timed power off switch
Protection of high voltage
Operation/Condition
APC controller
APC controller
B )
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