Digital audio ACHAPELL AUDIO 992EG Manual del usuario - Página 6

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• SERVICE/REPAIR - WARNING: With the exception of tube replacement (see below) the user should

NOT attempt to service this unit. Due to the risk of electrical shock and the presence of lethal

voltages inside the chassis. Only Digital Audio Labs or other highly qualified personnel are to

perform maintenance and service activities.

Tube replacement: Turn the unit off, disconnect the power cord and let the unit stand for at

least 20 minutes. Vacuum tubes run very hot, replacing them when they've had enough time

to cool to room temperature is recommended. It is also VERY important that enough time is

given to allow power supply voltages to drain. After 20 minutes has past remove the top panel

using a standard Phillips type driver.

To remove the tubes apply a slight circular/rotating motion as you pull it away from the socket.

DO NOT pull strait up as it will stress the PC board and the tube. It is important to replace tubes

with the same type of tube! When new tubes are installed double, triple check that you've

inserted the correct tubes into the V1~V4 sockets BEFORE you powerup.

NOTE: Each tube socket has a designation (V1 to V4) silk-screened onto the P.C. board of

each channel. V1 & 2 are the input tubes (12AX7/ECC83 or 6072), V3 & 4 are the output tubes

12AU7/ECC82/6189 . We recommend that you send the unit back for tube replacement as

there will likely be the need for grid balancing.

WARNING: Warranty may rendered void if tubes other than those listed above have been

used at any time.

Rear Main Fuse replacement (1amp slow-blow): Located within the rear power entry module (PEM)

are the two main AC fuses. To replace these fuses make sure the rocker power switch is turned off then,

disconnect the AC cord. Locate the two small slots along the top edge of the PEM; place your screw

driver in one of these slots and pull back on the housing door. Do not attempt to pry back the PEM from

the rear panel itself! The housing door will rotate back and expose the red sub-module. Note the fuse

orientation inside this module before you remove the fuses. Re-insert the housing back into the PEM

making sure the 115v/230v text is correctly oriented. Always replace fuses with same type from factory.

See International Power Settings below.

Contact Digital Audio Labs for any other servicing questions.

SAFETY PRECAUTIONS

• Never operate the 992 with the top panel removed. The top panel's perforations provide more than

enough ventilation for cooling. The top panel also plays an important role in maintaining good

signal to noise ratio performance.

• Always provide a source to ground (earth.) Never under any conditions should a power cord that

has the 3rd prong for ground missing or defeated be used.

• Do not place the 992 in an area where there is a potential for fluids to fall, spill into or come in

contact with the 992. If you notice fluids or moisture present inside the 992 DO NOT turn power on!

Although there are plenty of safety measures built into the unit for the protection of the user, it is best

if you contact Digital Audio Labs for direction.

LACHAPELL AUDIO MODEL 992