Fault Diagnostics; Hints And Tips - Arcam DiVA A85 Service Manual

Fault Diagnostics

Fault
No power
Unit functions ok but no audio
Volume control locks up
DC offset
Unit fails to respond to commands
Unit gets very hot
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).
Action
Check fuses
Check power supply rails
Check preamp fuses
Check RL100A (volume control mute relay)
Check +5V supply rail
Check mute signal line
Check software version is 2.0 or higher
Check equipment connected to amp for DC on the audio leads
Check alterations as per ECO 01_1101 have been fitted
Check ribbon cable from display to main board
Check ribbon cable from display to preamp board
Check power stage IQ settings