SAFETY INFORMATION
Warning
Any person performing service of this unit will be exposed to
hazardous voltages and the risk of electric shock. It is
assumed that any person who removes the amplifier from
this cabinet has been properly trained in protecting against
avoidable injury and shock. Therefore, any service
procedures are to be performed by qualified service
personnel ONLY!
Caution
This unit does not have a power switch. Hazardous
voltages are present within the unit whenever it is
plugged in.
Before the amplifier is plugged in, be sure its rated voltage
corresponds to the voltage of the AC power source to be
used. Incorrect voltage could cause damage to the
amplifier when the AC power cord is plugged in. Do not
exceed rated voltage by more than 10%: operation below
90% of rated voltage will cause poor performance or may
shut the unit off.
Leakage/Resistance Check
Before returning the unit to the customer, perform a leakage
or resistance test as follows:
Leakage Current. Note there is no power switch on this unit.
When the power plug is plugged in, the unit is live. Connect
the unit to its rated power source. Using an ammeter,
measure the current between the neutral side of the AC
supply and chassis ground of the unit under test. if leakage
current exceeds 0.5mA, the unit is defective. Reverse the
polarity of the AC supply and repeat.
Resistance. Measure the resistance from either side of the
line cord to chassis ground. If it is less than 500k ohms, the
unit is defective.
WARNING! DO NOT
return the unit to the customer if it fails
one of these tests until the problem is located and corrected.
Critical Components
All components identified with the IEC symbol
in the parts list and the schematic diagram
designate components in which safety can be
of special significance when replacing a
component identified with
. Use only the
replacement parts designated in the parts list or parts with
the same rating of resistance, wattage or voltage.
List of Safety Components Requiring
Exact Replacements
F1
Fuse SLO BLO 0.63A 250V T type.
UL approved
PWRCORD SPT-2 or better with polarized plug, UL
approved wired with the hot side to fused
side. Use with factory replacement panel
strain relief only.
TRX
Transformer. Use only factory replacement.
DBR
Bridge diode. Use only factory replacement.
C1, 2
3300uF, 50V electrolytic filter caps. Be sure
replacement part is at least the same
working voltage and capacitance rating.
Also the lead spacing is important.
Incorrect spacing may cause premature
failure due to internal cabinet pressure and
vibration.
C6
10uF 50V
±
20% Elect. Radial NP
Safety Part
See Page 15 Service Bulletin
R29
470
W
0.25W
±
5% METAL OXIDE
Safety Part
S53AMI
Power Amp module. Use only factory
replacement
CMC1
mc4438
Safety Part
L1
mc4436
Safety Part
2
Amplifier/Subwoofer
ARC SUB10/DS-10
