Alesis IO/2 Service Manual page 59

UB0MND - Main PCB Rev D
RevChange Document
Suggested Performed
SCH PCB CAM DATE
by: by:
x x SOP 10/26/2005
x x SOP 10/26/2005
SOP 10/26/2005
x x MBL 11/16/2005 AWS
x x MBL 11/14/2005
x x MBL 11/14/2005 AWS
x AWS 11/28/2005 AWS
x AWS 11/28/2005 AWS
x AWS 11/28/2005 AWS
x AWS 11/28/2005 AWS
x AWS 11/28/2005 AWS
Last Revised:
12/1/2005
DATE Description of change:
TOP LEVEL CHANGES
Change all text from Rev C to #
update all Part Types
Review/Integrate all outstanding ECNs
12/1/2005 Reduce gain on guitar inputs by 3dB.
Change headphone volume control to pre-Master volume.
Add 100ohm resistors between input DC blocking caps (C25,
11/29/2005 30, 31, 35) and protection diodes (D3-10).
Resize holes on MIDI jack footprint. 49.2mil for shield pin,
11/28/2005 43.3 mil for other pins
11/28/2005 Resize holes on XLR jack footprint
11/28/2005 Modify 10mm PEB (PCB?) board edge to 13mm
11/28/2005 Modify footprint of 1-08-0222 for 1mm hole size
11/28/2005 Unplate corner mounting holes on main pcb
Note: ***A new solderpaste stencil IS required***
SCHEMATIC CHANGES
PCB CHANGES
Reason for change:
SOP
SOP
SOP
Inputs will clip with standard guitar and gain at minimum
Protect negative voltage regulator from damage due to short. (This
was implemented as rework pre-production so there is no ECN.)
Yahourng request
Yahourng request
Yahourng request
Yahourng request
Yahourng request
Components were added.
This is done on the Front Panel PCB.