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Yorkville Sound
Yorkville SoundYorkville Sound
Yorkville Sound Phone: (905)837-8550 Ext.218
550 Granite Court Fax: (905)839-5776
Pickering, Ontario Email: pmourtos@yorkville.com
Canada L1W 3Y8 www.yorkville.com
SERVICE BULLETIN
Date
DateDate
Date :
::
: March 6, 2000
Re
ReRe
Re :
::
: AP812/AP818 GROUND HUM UPDATE
Dear Staff & Dealers,
Due to some feedback from our customers a service issue regarding hum problems have
been discovered with the AP812 and AP818 mixer/s. Please be advised that units in
production after March 2000 will NOT have this problem.
The HUM problem only occurs when the main in/out jacks are used (i.e. if a processor is
used). There is considerable hum at the MONITOR OUT jack as well.
To solve these problems follow the directions listed below...
Required Modification:
--------------------------------
1. Seperate Top & Bottom
2. Find where the Orange & Green Wires are soldered to eyelets, pretty well in the center of
the board (marked with an Orange & Green X on the layout provided).
CUT the Orange & Green Wires as close to the EYELETS as possible (on the filter capacitor
side). (as shown circled in RED
3. Solder both wires (that you've just cut) to TAB 3 (as shown circled in GREEN)
4. Don't forget to re-connect the Green Wire (female spade) to the Top Mixer (male spade lug)
We are sorry for any inconvenience caused as a result of this problem. For further technical
information or assistance please contact Peter Mourtos at Yorkville Sound via phone at
(905) 837-8550 Ext. 218 or via email at pmourtos@yorkville.com .
Enclosed - the Layout for the AP812/818 M1104 Power Amplifier board with instructions.