Arcam RCUBE, Service Manual

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Overview
The rCube in its simplest form can be thought of as a high performance iPod docking station
with more than a few unique features these include.
Wireless transmission from either iPod transmitter (Arcam Wand) or USB (Arcam Wave) these
are both optional extras.
rCubes can transmit to each other from a docked iPod or external source wired source.
Internal battery power supply.
Easily replaceable iPod header (covered latter in manual).
Access
Although very compact the rCube is designed to be serviceable with access gained from
underneath to all electronic circuits (remove the four rubber feet) you will see four Philips
screws, once these are removed the base plate can be lifted away exposing the main circuit
board. The main speaker array is not considered a serviceable part but will be available as a
complete assembly. Please see detailed exploded view.
Circuit description
PSU and charge
The 19V D.C PSU for the rCube is derived from either an external regulated PSU or if not
present from the internal lithium ion battery packs the following is a description of the PSU
selection.
The external 19V power supply is connected to Con600 and is internally fused by the 4A fuse at
location FS600 the rear panel switch can be seen at location SW600(a), D600 is used to prevent
reverse bias, D602 and TR600 from a D.C sense circuit this line goes to the main micro at
location U301 pin 7.
PSU selection is control by the MAX1873 Switch mode Li charge controller at location IC603 the
external 19v source can be seen to arrive at pin 15 (DCin) and when present simply by ‐ passes
the chip whilst being monitored by pins 1/2 (current sense) and can be seen to form the 19v
source net on the diagram. The internal battery source can be seen connected to CON602 and
again travels thru the 2
nd
pole of switches available on SW600(b) D605 and TR603 are used to
form simple logic to indicate to micro U301 that battery power is present, D606 allows a path to
the main 19v net whilst preventing reverse bias, the Mosfet (M601) is used to enable charge if
necessary when power is present – the entire circuit is overseen by the main micro U301 via