Yamaha PC4002 - Installation Precautions

INSTALLATION PRECAUTIONS
е |f you are using long speaker cables, use the heavy Speaker system
‘gauge cables which are practical, in order to prevent
damping factor deterioration and/or power loss
through the cable. The PC4002/4002M's speaker
terminals allow you to use even the heavy gauge
cables.
е The PC4002/4002M produces 430W + 430W (into
8ohms) in stereo mode, and 1400W (into 8ohms)
Power ampo Ф
іп mono mode, so use а speaker system which has РО = РВ
sufficient capacity to handle this power comfortably.
You can protect speakers of lower rated input capacity PO: Speaker continuous input power capacity (Noise
than the rated output power of the PC4002/4002M or RMS)
by connecting a fuse directly between the speaker Е: Nominal impedance of speaker
and amplifier (see illustration). When using a system l: Required fuse capacity (A)
such as the one illustrated, follow the procedure on [= /PO/R-
this page to determine the capacity of the fuse to
be used. Example
Speaker continuous input power capacity
100W
Speaker impedance
8ohms
In this example
-/100/8
1+3.5A
IF THE CLIPPING AND PROTECTION CIRCUIT OPERATION INDICATORS LIGHT UP
лы еве | a. | ation T
Cause ation
Short in speaker termi- | Examine the places | The PC limiter is in op-
nal, amplifier output ter- | where shorting may have | eration, protectiong the
minal, or cable occurred power transistors
Clip indicator
Make sure the speaker
system impedance is
more than 4ohms when
in stereo mode, and
8ohms when in mono
mode
Amplifier overloaded The same as above
Check the airflow and
take appropriate meas-
шев to keep the
amplifier(s) cool
The thermal protection is
in operation, protecting
the Power transistors.
Heatsink temperature
Protection indicator
RISSE exceeds 100°C
The protection relay is in
operation, protecting the
speaker system
A DC voltage of more
than 42V has occurred
at the output terminals
Contact your YAMAHA
distributor or service
center