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darTZeel NHB-108 model one

User Manual, version B 1.0

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8.2. Troubleshooting

While setting up your

NHB-108 model one

, it is

possible that you may not obtain the desired results.
Hereunder we list the most frequent problems you
are likely to encounter. If the problem cannot be
solved, please do not hesitate to contact us directly
at:

[email protected]

8.2.1. Eyes Closed

The eyes are closed – I beg your pardon, extin-
guished - while the

Power Nose (3)

button is ON.

Please check that the AC power cord is correctly
connected at both ends, and that the mains AC volt-
age is present. Just test with a table lamp. If AC is
present, it means that both primary fuses have
melted. Please go to point

7.1. "Fuse(s) replace-

ment"

One Eye only is not lit. This means that you have to
change the corresponding channel fuse.

8.2.2. Blinking Eyes

Blinking Eyes indicate that the output DC offset
value has exceeded the permitted limit. If such an
event occurs, please read the following:

A) Eyes blink at cold power ON. If your listening

room is at a temperature below 65°F (18°C),
this could be considered as normal, provided
that this behaviour disappears in the following 3
to 5 minutes.

In a room at a temperature above 65°F (18°C),

blinking eyes indicate that your

NHB-108

model one

could do with some tuning. How-

ever, if this behaviour ceases after 3 to 5 minutes,
and especially if you can put up with it, no ad-
justment is mandatory.

B) Eyes blink after several hours, when the ma-

chine is hot, or even

very

hot. If your room tem-

perature is above 90°F (32°C), this can be con-
sidered as normal behaviour, and normally the
eyes should stop blinking as soon as the ambient
temperature returns to "human being" levels.

Please also check that your

darTZeel NHB-108

model one

is properly ventilated, as indicated

in chapter

5.2. "Location"

and that you are not

using it at quasi-permanent power clipping lev-
els with 3

Ω

loads.

If the ambient temperature is under 90°F (32°C)
but the Eyes blink, your machine needs some
tuning.

To cut a long explanation short,

NHB-108

's eyes

should not blink in ambient temperature ranges
from 65°F to 90°F (18°C to 32°C). If they do, the
amplifier needs some adjustment.

In all cases it is important to know the working
environment in which you will use your

darTZeel

NHB-108 model one

If you live at the South Pole or on the Equator, a
slightly different setting could be necessary, espe-
cially when the DC compensation offset is

off

If you need to know more about this topic, can you
guess what? Yes, read the technical section…

8.2.3. Amplifier ON, no sound

Please check first the Eyes’ illumination state, as
described in point

6.2. “

darTZeel

’s Eyes”

A) Idle state. No signal is present at the input of

your

NHB-108 model one

. Be sure that the

source (SACD, CD, Tuner or whatever) is cor-
rectly selected and connected to the preamplifier
feeding your machine.

Please also verify that the

Input Impedance

Selector (9)

of each channel is

not

at the upper

position ("

Zeel

Ω

") when you are not using a

darTZeel NHB-18NS

preamplifier.

Signal presence. The input source is correctly
connected and routed,

but the loudspeakers are

not hooked to the

Speakers Terminals (6)!

remind you that this is totally forbidden. Okay,
no trouble for this time. You are lucky enough
that the Crowbar circuit did not melt one fuse or
two…

No sound when using XLR inputs. Please check
that the

Input Impedance Selector (9)

of each

channel is at the lower position ("XLR Bal.").

8.2.4. Warped sound

You are using the

RCA input (4)

, but the

Input

Impedance Selector (9)

of one or both channels is

in the upper position ("