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Fault

No power

No Audio output

Fails to respond to commands

No Display

Spurious display readout

Display reads "ERROR CIP FAILURE"

Display reads "NO SERVICE FOUND"

Position

TP1

TP2

TP3

TP4

TP5

TP6

TP7

No analogue signal - measure between the junction of D10, D11 and D8, D9 for the

secondary supply feed from the transformer, this should be 40 VAC. If this is low or missing

the transformer will require replacing.

Not responding to front panel controls – check the processor is ok by pressing the bypass

button, if the bypass relay functions then check the DAB module supplies are ok. If ok then

replace the DAB module.

Please note that there are no serviceable parts within the DAB module.

DT81 Service Guide

Fault diagnostics

Action

Check mains fuse

Check power supply rails

Check for digital output

Check analogue power supply voltages

Check DAC IC

Check supply voltages

Check DAB module

Check flex foil cable

Check for dry joints on micro and display

Check for dry joints on display board

DAB module not communicating with main micro – replace

DAB module

DAB module not receiving signal – check connections to

DAB module/ replace DAB module

Power supply test points

Voltage

0 volt reference

+5 volts - DAB module

+10 volts - DAB module

+5 volts - DAC

+15 volts

-15 volts

+5 volts

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