TBP-1
®
™
(This is the model name for warranty claims)
4
SERVICE NOTES
1.
The CHASSIS
is opened by removing the top
cover from the chassis. This is accomplished
by removing eight (8) flat head Phillips screws,
four (4) from the top and two (2) from each side.
2.
TUBE REMOVAL
is accomplished by twisting
the tube retainer shields slightly counter-
clockwise to release and slide them off. The
tubes can then be pulled out straight away from
the PCB.
3.
TBP-1 POWER SUPPLY BREAKAWAY PCB
REMOVAL
is accomplished by disconnecting
two (2) ribbon cables (P4, P5) and seven (7)
transformer wire Fastons (P1-2, P6-10), and
removing four (4) PCB mounting lockwasher
screws. The PCB can then be lifted away
enough for servicing. To remove completely,
cut the plastic wire ties securing the black and
white primary circuit wires, and disconnect them
from the power switch. Note the use of shrink
tubing for an extra layer of insulation around the
switch (a safety requirement).
4.
TBP-1 FRONT and TUBE BREAKAWAY PCB
REMOVAL
is accomplished by disconnecting
one (1) ribbon cable (P3) and removing the fol-
lowing items: all front panel knobs (11) including
nuts and washers, one (1) input jack nut and
washer, four (4) PCB mounting lockwasher
screws, and three (3) flat head Phillips screws
attached from the bottom of the chassis.
5.
TBP-1 REAR BREAKAWAY PCB REMOVAL
is accomplished by removing all rear panel
knobs (4) including nuts and washers, eight (8)
¼” jack nuts and washers, two PHP screws at
the Balanced Line Output XLR jack (J9) and
three (3) PCB mounting lockwasher screws.
Exercise care when pulling off the “thumb-
wheel” knob (Crossover Frequency) so as to
not damage the triple-section potentiometer
R143. Note the extra insulating washers used
with the Rear Panel Input Jack (J1), required to
maintain ground isolation at the rear panel for
hum-free operation.
PCB EXCHANGE POLICY
Parts marked with a single asterisk (
*
) in the Part
Lists are not field replaceable. If a failure due to
one of these components is detected, please con-
tact the FMIC Customer Service Department to
order the complete PCB Assembly.
