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Help 34
562 User Guide
Help!
Standby point not lit
Check the following:
1. There is AC power connected to the socket on the rear of the 562
2. The power switch on the rear panel of the 562 is turned on
If the 562 will still not illuminate, check any fuses in your power supply
and the fuse in the inlet of the 562. If these are all intact, contact your
dealer.
Audible hiss at high volume settings
The input dynamic range of any recordings you have are at maximum 16
bit. The reason for this is that CD and other consumer sources use a 16
bit standard. The analogue sources you have cannot achieve this kind of
range. For comparison, analogue sources are likely to be of the order of:
• FM Radio, 13 bits
• Reel-reel tape, 13 bits
• Cassette tape, 12 bits
• LP, 11 bits.
Note that there may be a difference between the dynamic-range of the
source channel when it is operating, and the noise you hear in standby.
For example LP normally has lower noise when the stylus is not in the
groove; similarly tape will be quieter when it is stopped. CD may also be
quieter when it is stopped, producing so-called ‘digital silence’.
The 562 has a 16 bit capability from input to output on analogue sources.
When the volume is turned up high you may hear this dither as a hiss
when the sources are stopped. This hiss is lower than the background
noise of your recordings and is of no consequence.
Poor sound quality
Poor sound quality will usually result from one of the following:
• Driving an analogue input too hard. generally this will be accompanied
by a flashing of the Level light on the front panel. The solution is to
adjust the input sensitivity for that source in Gain. See page Error!
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Hum on LP inputs
The turntable input is the most sensitive on the 562. It is fairly common for
installations to have problems with hum. The most common causes are:
• Tone-arm not connected to the technical ground of 562 as described
on page 25.
• Tone-arm connected to power ground in turntable. This connection is
not appropriate for 562 since the analogue input section of 562 is not
connected to its output (which is connected to the power ground).
• Magnetic pick-up. If you have another piece of equipment that incorpo-
rates a mains transformer too near the turntable or the left-hand-side
of 562 this may be the cause of hum
– particularly with MC cartridges.
Re-orient the equipment to see if this fixes the problem.
Hum on other inputs
There is no reason for 562 to produce hum on analogue inputs other than
LP. Check the source equipment. If 562 seems to be the cause of hum
consult your dealer.