Astin Trew AT 3000 운영 매뉴얼 - 페이지 11
{카테고리_이름} Astin Trew AT 3000에 대한 운영 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Astin Trew AT 3000 13 페이지. Up-sampling with valve output amplifier
페이지 인쇄non-scratch surface to prevent
marking.
You are now ready to replace the
valve.
Valve replacement.
We recommend the valve is replaced
every 20,000 hours. This is conser-
vative and perhaps represents a two-
thirds life expectancy for the quality
valve in this design.
The CD buffer amplifier uses a
6922 type valve only.
There are a number of manufacturers
offering this valve type. Spare
ASTINtrew valves can be purchased
through your dealer or distributor.
Changing valves:
Valves run HOT when in use. Wait an
hour after switching the CD Player off
before changing valves. The valve
holder is attached to the printed cir-
cuit board, and the spring terminals
that hold the valve pins are strong, so
care has to be taken not to damage
the board or valve when removing or
replacing them.
Do not pull or push the valve
straight into the holder.
This could bend the circuit board and
may result in damage.
The correct way to remove / insert a
valve is to pull / push gently whilst
rocking slightly in a circular way (do
not twist).
10
When inserting a valve, first ensure the
pins are not bent on the valve. Locate
the pins onto the valve holder correctly by
aligning the 'spacing position' on both
valve and holder.
Remove the white teflon valve damper
from the old valve and replace on the
new valve in the same position.
Ensure no items such as tools are left in
the CD Player, replace the top plate, not-
ing the front and back screw positions
are different, re-fit all 10 Alan screws.
Take care not to over tighten and damage
the screw head or key.
Changing the fuse:
The fuse holder is located on the back
plate within the IEC mains socket casing.
A spare 20mm glass 800mA fuse is
located within the fuse carrier. The UK
13A plug is also fused.
8. Troubleshooting
If the CD Player fails to work or you sus-
pect it is not working properly, first check
all connections to the amplifier or DAC.
Check the power supply is on at wall,
amplifier(s) and source components are
switched on, loudspeaker cables are fit-
ted and secured at both ends.
Below are some common problems with
suggestions. The list is not exhaustive. If
you cannot resolve the problem yourself,
please consult your appointed ASTINtrew
dealer or distributor.