Specifications

Australian Monitor
Service Bulletin
AMIS120 Mixer Amplifier
AMIS120XL Mixer Amplifier
AMIS120P Booster Amplifier
AMIS1202P Booster Amplifier
12V Regulator Capacitors
13 March 2012
P
age 1 of 1
Applicable Models
This bulletin applies to AMIS120, AMIS120P, AMIS120XL
and AMIS1202P models manufactured prior to March 2012.
For Information Only
This bulletin is intended for service technicians only and is to be applied when repairing failed amplifiers. This bulletin
does not apply to functional units.
Known Issue
A larger than expected number of failures have been observed once these models have been in service for a number
of years, due to the failure of a number of electrolytic capacitors in the negative 12V power supply inverter.
When the negative inverter circuit falls out of specification the amplifier may exhibit a large DC offsets at turn on,
resulting in failure of the main AC bridge rectifier.
Solution
Replacement of the electrolytic capacitors in the neg
ative 12V inverter section with higher operating temperature low
impedance parts is recommended in the interest of longevity and reliable operation. Replace the critical components
as per the table below.
R
ecommended Part
Designators Value Voltage
T
emperature
Rating
Special
Attributes
Panasonic Element14
C20, C21, C25 220uF 35V 105ºC Low ESR
E
EUFC1V221 9692282
C26, C27 47uF 35V 105ºC Low ESR
E
EUFC1V470 1848447
Notes
 All models manufactured March 2012 or later are fitted with higher specification parts and should therefore
p
rovide improved longevity and reliability.
 The Panasonic parts recommended may be substituted with other brand components of similar specification.