Linn LK260, Руководство по обслуживанию

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LK2 Reliability Modifications
Page2
Copyright © 2000 Linn Products Limited. All rights reserved.
Paul O’Neill
Fault Symptoms
There are several different symptoms, depending on what component has failed (symptoms usually affect
one channel only):
•
No output at all
•
Bad distortion at output
•
DC at output
Units affected
Potentially all LK260s or LK275s (those not upgraded to LK280)
Equipment Required
(Those items marked
~
may not definitely be required)
Workbench clear of debris and clutter
No2 Posidriv (Supadriv) Screwdriver
~ No1 Posidriv (Supadriv) Screwdriver
~ 2.5mm Hex key or Allen Key
~ Medium sized flat-blade screwdriver
7mm spanner or nut-runner
5.5mm spanner or nut-runner
Soldering Iron, temperature controlled 25 watt with fine tip
Solder Sucker
Fine solder
Paper handkerchiefs or paper towels
Heatsink compound (a white grease-like substance that improves heat conduction)
Fine Pliers
Soft cloth
Parts Required
20Kohm, 2.5Watt resistor Qty 2 (per unit)
2.4Kohm, 2.5Watt resistor Qty 2 (per unit)
220pF 160V Polystyrene capacitor Qty 2 (per unit)
68pF 160V Polystyrene capacitor Qty 2 (per unit)
Note – if you cannot find the above parts available in your local area, some alternatives are available in the
case of the resistor wattage values:
It is possible to use a higher wattage
resistor in each case, although it tends to be the case that the higher
the wattage, the larger the resistor and it may not be able to physically fit in the space available or may touch
against another device or component, especially in the case of R33 (not a good idea).
It is possible to use a slightly lower wattage resistor in each case, however if too low. this will shorten the life
of the resistor and the fault may re-occur. A minimum of 1 watt is recommended.