DT81 Service Guide
Fault diagnostics
Fault Action
No power
Check mains fuse
Check power supply rails
No Audio output
Check for digital output
Check analogue power supply voltages
Check DAC IC
Fails to respond to commands
Check supply voltages
Check DAB module
No Display
Check flex foil cable
Check for dry joints on micro and display
Spurious display readout
Check for dry joints on display board
Display reads “ERROR CIP FAILURE”
DAB module not communicating with main micro – replace
DAB module
Display reads “NO SERVICE FOUND”
DAB module not receiving signal – check connections to
DAB module/ replace DAB module
Power supply test points
Position Voltage
TP1
0 volt reference
TP2
+5 volts - DAB module
TP3
+10 volts - DAB module
TP4
+5 volts - DAC
TP5 +15
volts
TP6 -15
volts
TP7 +5
volts
Hints & tips
!
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.
Содержание DiVA DT81
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