Installation guide

Sections

1. Power Problems

2. No Communications

3. Basic Processor Operation

4. Readers and Card Problems

5. Input Problems

6. Output Problems

Section 1 Power Problems

Is PWR led (D20) on? • Check incoming voltage on J1, Pins 1, 2. Power should be

minimum of 16.5 v. and not over 28v AC or DC

• If DC voltage Positive terminal needs to on Pin 1

• Dead short in eld, the positive 12v from control panel has

dead short to earth ground somewhere. Disconnect all

terminal block except for main power, remove battery and

cycle power. Did led (D20) come on? If not replace MAC-

4R-PCB. If yes, continue

Aux 12v Power on? • Check terminal blocks J12, Pin 4; J3 Pin 4; J11 Pin4; J4

Pin 4; and J13 Pins 1-4 Voltage should be at 12-13.5 vdc

• Check terminal blocks J5, Pin6; J6, Pin 6; J9, Pin 6; J10

Pin 6 voltage should be at 12-13.5 vdc

• Dead short in eld, the positive 12v from control panel has

dead short to earth ground somewhere. Disconnect all

terminal block except for main power, remove battery and

cycle power. Did power return to all pins? If not replace

MAC-4R-PCB. If yes, continue

• Plug eld wire in one terminal block at a time until power

drops out again. Repair eld wire and repeat this step.

Check Ground? • Take a VOM (set on continuity) and check J1, Pin 3 to

Earth or structural ground. Meter should show continuity.

Check Battery? • Check terminal block J2 Pin 1, it should be 13.5 volts dc.

• Could have a bad Gel Cell battery, Disconnect Gel Cell

battery from MAC-4R, measure again. Did voltage come

back? Yes, Continue

• With battery disconnected take voltage reading across

battery terminals, voltage should measure 12vdc, if not

replace battery.

MAC-4R Troubleshooting Guide

REV 2.0