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ALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99
Alpha 10 DAVE Module Service Manual the high switch on currents. It should be noted that the two
switching regulators are fairly sensitive and disruption of
Issue 1 Paul Newton/Richard Martin May 99 the 52kHz switching signal will may cause damage to both
the Alpha 10 and the DAVE Module.
CONTENTS
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Fan Control Circuit
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 The fan circuit is controlled by a temperature sensor (Z21),
the output pins of which are normally high. There is
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 normally a voltage across the fan connected to SK19 but
it is not normally enough to turn the fan motor. When the
temperature rises above 55 deg.C (set by the resistor
Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
network on Z21), the Out1 pin goes LOW and the voltage
across SK19 is increased so that the fan motor will turn
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 over at a relatively low speed. To make sure the fan starts,
the effect of C58 charging causes there to be
approximately 12V across the fan. Out2 will go low at 65
deg. C and this informs the H8 micro as well as causing
Summary the voltage across the fan, and hence the fan speed, to
increase by switching Q6 on. If the the temperature of the
Using the Alpha 10's modular design concept, the DAVE unit remains at this point for too long a period then the H8
Module is designed so that you can just plug it into an will intervene. It should be noted that this circuit is running
existing Alpha 10 integrated amplifier and it will convert during Standby and Soft Power Down and hence the fan
that unit into a Digital Home Cinema System. can operate during these modes.
The DAVE Module consists of a bought in module from Audio and the SRS Digital Audio Surround Processor
Sample Rate Systems (SRS) in Finland which is capable Module
of decoding SPDIF information to extract Dolby Digital or
DTS Digital for Surround sound information or Stereo The audio types on the DAVE Module comes in two types:-
information. It is also capable of analogue to digital
conversion so that either Sub Woofer information or Dolby 1 Analogue audio can be fed into the module from
Pro-Logic information can be extracted and outputted. the input connectors of the Alpha 10's pre-
amplifier. It is routed through a pair of Analogue
The rest of the module consists of a PSU, microprocessor, Multiplexers (Z1 for Right and Z2 for Left hand
fan for cooling, audio/video switching and muting, on channels), and then on through to the SRS Digital
screen display generator which is tapped into the video Surround Module.
monitor out lines and digital inputs for both optical and
coaxial digital audio. 2 Digital audio from CD, DVD, Laser Disc or other
SPDIF generating sources can be fed in through
Circuit description either one of the two coaxial or two optical inputs
and through a Digital Multiplexer (Z3) to the SRS
Supplies and Start Up Digital Surround Module.
In Standby and Soft Power Down of the Alpha 10 the Micro The SRS Module performs the following functions :-
Processor, Temperature Sensor and Fan Circuits are
powered up due to the fact that these supplies are derived