Linn LK85 Service Manual page 6

nd
2 June 1999
Fuse blowing May be intermittent
Fuse blowing May be intermittent
but usually constant
Fuse blowing May be intermittent
Fuse blowing May be intermittent
but usually constant
Fuse blowing May be intermittent
but usually constant
Page6
Contents
Wrong mains voltage for unit
voltage setting - mains
voltage is too high, e.g. 115V
unit connected to 230V
mains.
If the voltage setting is
slightly off (e.g. the unit is set
to 100V but used with 115V
mains), the fuse may blow
occasionally.
Transformer faulty. To check
if it is definitely the
transformer, power down the
unit, replace fuse, disconnect
the transformer output from
the Main board and power
up. If the transformer IS the
cause, the fuse will continue
to blow. If the fuse remains
intact, the fault is more likely
to be on the Main board.
Try another transformer of
the same type if you have
one.
Faulty mains inlet
Bridge rectifier diodes – D1,
D2, D3 or D4 internally short
circuit.
It is usually very easy to
measure which (if any) of
these diodes have gone
faulty – a faulty diode will
measure short circuit or very
low impedance (a matter of a
few ohms only) in both
directions.
Fault inside unit, e.g. short
circuit or similar.
Copyright © 1999 Linn Products Limited. All rights reserved.
Replace fuse WITH CORRECT
TYPE & RATING and replace
mains transformer with correct
type to correspond with Mains
used. Transformer part nos:
LK85
230V - MCAS 030/230
115V - MCAS 030/115
100V - MCAS 030/100
LK140
230V - MCAS 033/230
115V - MCAS 033/115
100V - MCAS 033/100
Replace transformer – Linn part
nos:
LK85
230V - MCAS 030/230
115V - MCAS 030/115
100V - MCAS 030/100
LK140
230V - MCAS 033/230
115V - MCAS 033/115
100V - MCAS 033/100
Replace mains inlet – Linn part
no: CONN 385
Replace faulty diode – Linn part
no: MISS 287.
See Introduction to Fault
Finding section (accessible via
Linfo Website - Product
Information) for tips on tracing the
fault.