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Troubleshooting
If you are having trouble with your amplifier, check the
following items.
no sound
Check the following:
The A28 amplifier is switched on.
<
The amplifier is not muted (i.e Mute is not shown
<
on the front-panel).
The selected source is generating audio (e.g., if CD
<
is selected, then the CD is playing).
The AV input is selected on the A28 instead of the
<
expected source. In this case, press
again to
AV
de-select the AV input.
The speaker outputs are enabled on the A28/P38,
<
as indicated by the lights above the
and/or
Sp1
buttons (as appropriate) being illuminated.
Sound cuts-out unexpectedly
If the temperature of the internal heatsink rises above
a safe level, then a thermal cut-out inside the amplifier
operates to protect the unit and the protection system
temporarily removes power to the speakers. The system
will reset itself as the heatsink cools down.
With two pairs of low-impedance speakers
<
Ω
connected (6
or less), overloads are more likely.
Overloading the amplifier may cause it to shut
down because of overheating.
Note that, due to the high output voltage from a
<
CD player, it is possible to drive your amplifier at
full power even though the volume is not set at
maximum. See page 11 to adjust the input trim of
a CD player or other input device.
amplifier does not switch back on
Both the amplifiers detailed in this handbook have a
protection mechanism which is activated if you switch
the unit on immediately after turning it off. If this
mechanism activates, wait 30 seconds before switching
the unit on again.
Sp2
Remote-control codes
The following tables give the IR commands accepted by the A28.
Note that the A28 also responds to code 20–53 (the
automatically to CD input on receiving this command.
Power commands
Command
Decimal Code
Power toggle
16–12
Power-on
16–123
Power-off
16–124
Source selection commands
Command
Decimal Code
select
16–0
SAT
select
16–1
phoNo
select
16–2
AV
select
16–3
TUNER
select
16–4
DVD
select
16–7
CD
select
16–8
AUX
menu navigation commands
Command
Decimal Code
16–32
Up
16–33
DowN
MENU
16–37
16–87
oK
Display control commands
Command
Decimal Code
Display
16–59
e-15
command for an Arcam CD player). The A28 switches
pLAY
Volume control commands
Command
Decimal Code
Mute
16–13
Volume up
16–16
Volume down
16–17
Speaker control commands
Command
Decimal Code
Speaker 1 toggle
16–35
Speaker 2 toggle
16–39
Speaker 1 on
16–43
Speaker 1 off
16–44
Speaker 2 on
16–45
Speaker 2 off
16–46
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