18
th
August 1999
Valhalla Service Manual
Page3
Copyright © 1999 Linn Products Limited. All rights reserved.
Circumstances
Then simply follow the table along – the table specifies circumstances surrounding the fault symptom – e.g.
whether the fault is likely to be intermittent or constant, if the fault only occurs within a range of serial
numbers etc.
Possible causes
The next column details possible causes – this is effectively the most important section, probably the main
reason you are looking at this manual at all. There may be several possible causes for the symptom you
have – it is worth checking out all of these (and bear in mind that there may be more than one fault). For
some faults, simple checks are detailed that you can use to rule out the problem without replacing any parts,
whereas for other faults, the simplest way to rule out the problem is to replace the component(s) listed
Cure
Quite simply the action that you must take to cure the problem.
Installation
Important Safety Information
Lethal Voltages Present – exposed live parts.
We strongly advise that you do not to carry out any fault finding or other work on or near the Valhalla while it
is powered up – see points below.
§
If the Valhalla is connected to the mains, then
it is powered up
– DO NOT ASSUME that because the
switch LED is off that the Valhalla is powered down.
§
When the Valhalla is powered up, lethal voltages are present and easily accessible. While powered up,
do not touch any part of the circuitry with any part of your body or with metallic or conductive objects.
§
Some measuring instruments, such as an Oscilloscope, if grounded to the Valhalla can cause a massive
power surge, which may blow the board and/or the test equipment.
§
Only if you are very experienced with working on live circuitry and know exactly what you are doing
should you attempt faultfinding on the live circuit.
§
An isolated power supply must be used if work is being carried out on the live circuit to prevent power
surges as explained above and to lessen the danger of lethal electric shock.
Mains connections
The LP12 to which the Valhalla is fitted
must
be earthed – both for Safety and functional reasons.
The wires in the mains lead are coloured in accordance with the following code:
Green & Yellow
:
Earth
Blue
:
Neutral
Brown
:
Live
As the colours of the wires in the mains lead of this appliance may not correspond with the coloured
markings identifying the terminals in your plug, proceed as follows:
The wire coloured
Green & Yellow
must be connected to the terminal in the plug that is marked with the
letter
E
(earth) or the
Earth symbol
; or is coloured
Green
or
Green/Yellow.
The wire coloured
Blue
must be connected to the terminal that is marked with the letter
N
(neutral) or
coloured
Black.
The wire coloured
Brown
must be connected to the terminal that is marked with the letter
L
(live) or coloured
Red.
