Index
Lyra Maintenance Manual. D&R Electronica Weesp B.V. tel. +31 294 418041.
8. Product improvements hardware
From 9 September 2004:
L1 and L2 on Lyra DIG PCB changed from 4.7 H into a wire bridge.
This to stop oscillation of the 3.3V power rail when a CobraNet option is installed.
Lyra DIG PCB revision B this is fixed with a SMD 0Ohm resistor.
From 7 October 2004:
Power connection from PSU to Lyra DIG PCB is soldered permanently.
We noticed that due to the current that is drawn on the +5V power rail the contacts of the
Molex connector started to get more and more resistive. This results in a voltage drop over
the connector, which leads to an unstable Lyra.
Lyra DIG PCB revision B the Molex connectors are replaced by PCB terminal blocks.
From 6 June 2005:
Remove R28 on Core PCB.
When a CobraNet CM-2 Module is installed the audio from the CobraNet Module contains
clicks. This was due to the fact that the CM-2 module drive current for the Frame clock
line is not enough.
Note: This does NOT apply to CobraNet CM-1 modules although you will not notice
anything.
From 1 July 2005:
Change R93 on Core PCB to 6.8 kOhm.
We noticed that the Power Good only comes active is the +5V rail is above +4.8V. This
makes the Lyra vulnerable to power drops in the mains supply. When this modification is
preformed the threshold voltage will be +4.5V.
