Fender Passport PD-150, Руководство по обслуживанию

Страница: 7 / 48

PASSPORT
®
PD-150
(This is the model name for warranty claims)
7
to the rails before you open the set for service to
get an indication of a possible power supply fault as
it is connected to the rail output. Do not short these
terminals!
The SMPSU incorporates protection circuits other
than the fuses including over current protection. All
parts contained in the SMPSU should be consi-
dered to be safety parts and should be replaced
with only exact where service can be provided by
properly licensed and trained repair technicians.
This includes the dust filter as well as it has a fire
hazard rating.
Please be aware that voltages con-
tained in this module are deadly!!
Service Notes on Changes and Upgrades
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 artifact at the tail of the ducking
action. This was mainly detected on UL voltage set-
tings. This capacitor is added at the junction of R18
(1Mega ohm) and D16 and the Source (Ground) of
FET Q3 (J112). This modification should be per-
formed on individual units that are listed below by
S/N. All other UL units have been modified by the
factory.