AUSTRALIAN MONITOR AMIS ZRM4 Service Information - Page 20
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Australian Monitor
ZRM4 Zone Routing Mixer
Power Supply Capacitors
Applicable Models
This bulletin applies to ZRM4 Zone Routing Mixers.
For Information Only
This bulletin is a detailed expansion of a previous bulletin (Vol. 11), originally issued 14 November 2008 and also
covers the replacement/upgrade of additional parts.
This bulletin is intended for service technicians only and is to be applied when repairing failed products. This bulletin
does not apply to functional units.
Known Issue
A small number of failures have been observed once these products have been in service for a number of years, due
to degradation or failure of electrolytic capacitors in the power supply section. Failures modes include a total failure of
the bridge rectifier BR1, IC1, MOSFET devices V1 and V2, C8 and C9.
Solution
Replacement of the electrolytic capacitors in the power supply section with higher operating temperature low
impedance parts is recommended in the interest of longevity and reliable operation. Replace the critical component as
per the table below.
Designators
Value
C4, C8, C9.
470uF
Notes
The Panasonic parts recommended may be substituted with other brand components of similar specification.
This change was partially applied (C4 only) in 2008 to production models with serial numbers B00300001
and higher. C8 and C9 will be upgraded in production units manufactured April 2012 and later.
Additional production improvements implemented 2008 provide a T2A fuse on the input to the bridge BR1.
Service Bulletin
Temperature
Voltage
Rating
35V
105ºC
Recommended Part
Special
Attributes
Panasonic
Low ESR
EEUFC1V471
20 March 2012
Element14
1848452
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