KENWOOD KAP2
Service Manual

KAP-2
CIRCUIT DESCRIPTION / COMPONENTS DESCRIPTION / TERMINAL FUNCTION
Circuit Description
� Public Address (PA) function
The PA output switching relay is controlled by turning the PA function on and off. When the PA is activated, the PA output flows through the following path. The audio signal input from the microphone passes through the filter, amplifier and other circuits of the TX-RX unit (B/3) and goes to pin 5 (SPI) of CN3 of the relay unit. The audio signal passes through the relay (K2) and is output to pin 3 (OSP) of CN2.

Terminal Function
� Relay unit (X41-3670-20)
Pin No. Name I/O CN1 1 2 3 4 5 6 GND HR2 NC SPO SPI ESP O I O I Ground. Horn alert signal output 2. Non-connection. Speaker input. Speaker output. Speaker input. CN2 1 2 HR2 GND OSP ESP GND HR1 O O O I Horn alert signal output 2. Ground. External speaker output (PA). External speaker output. Ground. Horn alert signal input 1. CN3 1 GND HOR PA SPO SPI SB I I O I I Ground. Control signal input of Horn Alert function. Control signal input of Public Address function. Speaker output. Speaker input. Power input of switched power supply. Description

� Horn Alert (HA) function
The relay unit can be controlled by turning the HA function on and off and by using a signaling decode output. The maximum current of HA is 2A. There are two Horn Alert settings: HA1 (Default) and HA2. HA2 can be set by changing the short pin of CN1.
CN1 Connect 1-2 2-3 Set Up HA1 HA2 HR2 HA1 (Default) HR2 HA2 CN1 pin 1-2 connect HR1 CN1 pin 2-3 connect HR1

3 4 5 6

� External Speaker (KES-5)
External speaker KES-5 can be installed for KAP-2. If KES5 is installed, it can be set by changing the CN1 short pin from pins 4 and 5 (INT SP) to pins 5 and 6 (EXT SP).
CN1 Connect 4-5 5-6 Set Up INT. SP EXT. SP

2 3 4 5 6

� Cable (E37-1113-05) 6-pin Connector
1 4 2 5 3 6

Pin No. 1 2

Color Red Blue Yellow Green Brown Black

Name HR2 GND OSP ESP GND HR1

Components Description
� Relay unit (X41-3670-20)
Ref. No. Part name Q1,2 D1,2 Transistor Diode Switching Reverse electromotive force protection Description

3 4 5 6

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