Fender PASSPORT P-80, Service Manual

Page: 7 / 41

PASSPORT
®
P-80
(This is the model name for warranty claims)
7
The SMPSU incorporates protection circuits other
than the fuses including over current protection. All
parts contained in the SMPSU should be consid-
ered to be safety parts and should be replaced with
only exact where service can be provided by prop-
erly licensed and trained repair technicians. This
includes the dust filter as well as it has a fire hazard
rating.
Please be aware that voltages contained
in this module are deadly.
Service Notes on Changes and Updates
Refer to the mixer schematic diagram of this man-
ual for the following change. A 0.01uF mylar film
capacitor has been added to the VIP ducking circuit
to prevent a slight hum that may be heard as an ar-
tifact at the tail of the ducking action. This was
mainly detected on UL voltage settings. This ca-
pacitor is added at the junction of R18 (1Mega ohm)
and D16 and the Source (Ground) of FET Q3
(J112). This modification should be performed on
individual units that are listed below by S/N. All
other UL units have been modified by the factory.