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Fault Diagnostics
Hints & Tips
!
To check software version press PHONO, TUNER, DVD buttons on the front panel
simultaneously.
!
On issue 2 phono boards only, fit Kapton insulation tape to the phono stage PCB (rear panel
end) to prevent track shorting to chassis.
!
Check all fuses are the correct rating.
!
Check DC offset alterations are fitted as per ECO 01_1101
!
To isolate a fault between the pre or power amp section press the PRE/PWR button on the
rear panel to separate the two sections.
!
Check R100 on amp/psu board is not shorting to the track underneath (through plated via).
Fault Action
No power Check fuses
Check power supply rails
Unit functions ok but no audio Check preamp fuses
Check RL100A (volume control mute relay)
Check +5V supply rail
Check mute signal line
Volume control locks up Check software version is 2.0 or higher
DC offset Check equipment connected to amp for DC on the audio leads
Check alterations as per ECO 01_1101 have been fitted
Unit fails to respond to commands Check ribbon cable from display to main board
Check ribbon cable from display to preamp board
Unit gets very hot Check power stage IQ settings