CIRCUIT DESCRIPTION

POWER DISTRIBUTION (ALL MODELS)

 

 

Power Amplifier

 

Unsw Bat

RF Board

 

Unsw Bat

Audio/Logic

 

 

 

Board

 

 

J201

J302

Board

 

 

 

 

 

 

 

 

 

 

 

 

 

R533

 

4

2

 

 

 

 

Transceiver

 

 

 

Sw Bat

 

 

 

 

Power

 

 

 

 

 

 

 

5V

 

 

Power

Unsw Bat

 

 

Switch

 

 

Sw Bat

Vcc

15A

 

F500

 

 

 

Cable

Connector

J600

J501

 

 

Regulator

 

Fuse

4A

 

 

Sw Bat

 

 

 

 

 

 

 

 

U105

 

 

 

 

1

 

 

Q510

 

10

5

 

 

 

 

CR600

 

 

 

 

8V

 

 

 

 

 

 

2

 

 

High Tier

8V

8V

F100

 

 

 

 

 

 

 

Regulator

 

 

 

 

 

 

 

 

 

 

 

2A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Transient

 

Front Panel

U501

11 15

Sw Bat

 

 

 

 

Suppressor

 

 

 

 

 

 

 

 

 

 

 

 

On-Off Sw

 

 

11

J100

 

 

 

 

 

On-Off Sw

 

8V Tx

8V Tx

12

 

+

 

 

 

On-Off

Interface

J3

 

 

 

 

Switch

 

 

 

 

 

 

 

Latch

 

Board

 

 

 

Chassis

 

 

 

 

 

Sw Bat

Vehicle

 

 

 

(A/L Bd)

Q504

 

 

Ground

 

Low Tier

 

 

 

R2

 

 

Battery

 

 

 

 

 

 

 

 

 

From Shift

 

High

 

J1

 

 

 

 

 

 

 

J2

 

 

 

 

 

 

 

Reg U801

5.5V

Tier Only

2

5

 

 

 

 

 

 

 

 

5.5V

J1

 

 

 

 

 

 

 

 

From Latch

Regulator

 

Sw Bat

Microphone

 

 

 

 

 

 

U112 A/L Bd

 

 

 

 

 

 

 

 

U502

 

Jack

 

 

 

 

 

 

 

 

 

Display Board

 

 

 

 

 

 

 

 

 

 

 

 

Figure 3-1 Power Distribution and Switching

Interface Board

Audio/Logic Board

 

 

RF Board

 

 

 

 

 

 

 

 

(High Tier Only)

Power Switch

 

Ignition On

 

 

Supply

 

 

Sense

 

Sense

 

 

 

 

Q107

To uC,

Q108

To uC,

 

Switching

Sw Bat

 

 

Circuit

 

Pin 60

Pin 62

 

 

 

 

 

 

Unsw Bat

 

Front Panel

 

 

 

 

 

 

 

 

 

 

 

Q510

 

On-Off Sw

 

Q109

 

 

 

 

J100

 

J302

J201

 

J3

 

 

 

1

20

 

 

 

18

5

 

Power On-Off Latch

 

 

Q110

 

 

U113A-D

 

 

 

 

 

Unsw Bat

 

 

 

 

 

 

Low Tier Only

 

 

 

 

 

 

 

 

 

 

 

 

 

R170

From Ignition

Power Hold

From Shift Reg

SwitchU111, Q7 Note: Arrows Indicate Signal Flow.

This Resistor Installed If

Ignition Sense Not Connected

Figure 3-2 Power On-Off Control Circuit

filtering of the 13.6-volt supply. The emitter of Q513 is biased at about 4.5 volts by R538 and R542 (with a battery voltage of 13.6 volts). CR504 mirrors the base- emitter voltage of Q513, and the voltage across R541 is the same as the voltage across R542 when the voltage applied to R536 is approximately 12.8 volts.

Noise pulses less than 1.6 volt P-P then do not appear on the output of Q510 because of the emitter

voltage filtering provided by C565. This reduces the amount of noise applied to circuits powered by the switched 13.6-volt supply such as audio power amplifier U306. Additional filtering of the switched and unswitched battery supplies is provided by C548- C553. Resistor R534 turns Q514 off when power is turned off.

 

February 2001

3-3

Part No. 001-9800-001