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TUBE PCB ASSEMBLY REMOVAL starts by re-
moving the tubes and the thirteen (13) screws
which hold the PCB to the bottom side of the chas-
sis. At this point by pulling up on the PCB and tilting
it forward you should have enough access to re-
place most of the components located on the board.
If it becomes necessary to remove the PCB it is
best done by also removing the Power Supply PCB
Assembly at the same time. This is due to the fact
that the boards are hardwired together. The proce-
dure for removing the Power PCB Assembly follows
below. Again it is a very good idea to take a few dig-
ital photos and color marking or labeling all multi-pin
connectors before disassembly to make sure origi-
nal factory wiring and wire dress is
POWER PCB ASSEMBLY REMOVAL as stated
above must be accomplished by first removing the
Rear Panel PCB Assembly, Speaker Jack PCB As-
sembly, Input PCB Assembly, Gain/Structure PCB
Assembly, and the Control PCB Assembly. Once
PCB EXCHANGE POLICY
Parts marked with a single asterisk (
Lists are not field replaceable. If a failure due to
one of these components is detected, please con-
CIRCUIT DESCRIPTION
This section provides concise information about
new or unusual circuit designs incorporated into this
amplifier model. The purpose is to aid the service
technician by providing insight into the design areas
most likely to become obstacles in troubleshooting.
Information is focused for its effective use while
maintaining the security of Fender® proprietary in-
formation wherever possible.
PRE-AMPLIFIER
The guitar input signal is injected into INPUT jack
J6 on the INPUT PCB. Via a coax, this signal is fed
to the TUBE PCB to the first tube gain stage (V5-A).
maintained.
) in the Part
*
BASSBREAKER™ 15
(This is the model name for warranty claims)
these PCB assemblies have been removed you will
have full access to the top side of the Power PCB
Assembly. Before attempting to remove the Tube
PCB and Power PCB Assemblies as a unit every
attempt should be made to repair the Power PCB
Assembly from the top side. If top side repair is im-
possible then proceed with the Tube PCB/Power
PCB Removal.
Start the Tube PCB Assembly and Power Supply
PCB Assembly removal by marking and disconnect-
ing the fast-on connections from the Power
Transformer, Output Transformer, Choke and Mute
Switch. These are labeled as P3-P8, P49, & P50
from the Power Supply PCB and P21-P23, P25 &
P27 from the Tube PCB. Remove the thirteen (13)
screws securing the Power Supply PCB to the
Chassis bottom. At this point you should be able to
carefully remove the two (2) PCB Assemblies from
the chassis.
tact the FMIC Customer Service Department to or-
der the complete PCB Assembly.
AC coupling cap C56 feeds the GAIN control via a
coax. GAIN control R123 is on the INPUT PCB. A
coax sends this signal to the GAIN CONTROL PCB
to be routed via the first section of rotary switch S1.
The S1 rotary switch is a two section control that
provides signal routing for the LOW, MED, & HIGH
Gain STRUCTUREs available.
For the LOW Gain STRUCTURE, S1-A &B routes
the V5-A signal directly to gain stage U4-B to drive
the tone controls. The LOW Gain STRUCTURE
provides 2 stages of tube gain before the tone con-
trols.
6
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