Troubleshooting - CH A1.5 User Manual

6

Troubleshooting

Error
No power
No sound
(general)
No sound
("7" is displayed)
Lost in the settings?
Software update fails
USB flash drive for firmware
update is not detected by A1.5
If the error cannot be corrected using the information from the above table, disconnect the unit from AC wall power and from the
rest of your system and contact your authorized dealer.
6.1 Fuses ratings
(1) Standby fuse: Slow blow fuse, diameter 5mm x 20mm. 230V rating: T250mA; 115V & 100V: T500mA
(2) Power fuse: Slow blow fuse, diameter 6.3mm x 32mm. 230V rating: T10A; 115V & 100V: T20A
If fuses need to be replaced, use only fuses with the same rating.
Rev 1.0
Action
Check the AC power cord
Check the power button at the back of the unit
Check both fuses at the back of the unit
Check that your source is playing
Check that your A1.5 is turned on and that loudspeakers are properly connected according to
the desired amplification mode
Check that the system volume setting is not too low
Check that the correct input is selected on your preamplifier
Check that the correct input is selected on your A1.5 amplifier
Check that the correct amplifier mode is engaged
Your A1.5 is muted (display area 2 7 must be off). Unmute using the top button
Restore factory settings and start your setup again
Try the Emergency Software Update procedure
If it fails, download the latest A1.5 firmware from www.ch-precision.com, prepare a software
update image on the provided FAT32 formatted USB flash drive and run the Emergency
Software Update procedure again
Please try another brand of USB flash drive (e.g. Sandisk).
Troubleshooting
A1.5 User Manual 41