Warranty field service of the Passport® P-80 will be limited to replacement of defective
PCB Assemblies and all other parts not
repairs can of course be to the component level at the Service Center’s discretion. For
non-warranty component level repairs all parts listed as “REF” in the Parts List must be
sourced from suppliers other than FMIC.
Fender Musical Instruments Corporation, 8860 East Chaparral Road Suite 100 Scottsdale, AZ 85250
The description codes used in the itemized Parts Lists are defined below:
CAPACITOR
CAP AE = Aluminum Electrolytic
CAP CA = Ceramic Axial
CAP CD = Ceramic Disk
CAP CR = Ceramic Radial
CAP MPF = Metalized Polyester Film
CAP MY = Mylar
CAP PFF = Polyester Film/Foil
RESISTOR
RES CC = Carbon Comp
RES CF = Carbon Film
RES FP = Flame Proof
RES MF = Metal Film
RES MOX = Metal Oxide
RES WW = Wire Wound
CODES
CODES
specifications are subject to change without notice. This information and any copies produced
electronically or otherwise must be surrendered
upon demand of Fender® Musical Instruments
Corporation.
• Parts marked with two asterisks (
required use of that specific part. This is necessary for RELIABILITY and SAFETY requirements.
DO NOT USE A SUBSTITUTE!
HARDWARE
BLX = Black Oxide
CR = Chrome Plated
HWH = Hex Washer Head
M = Machine Screw
NI = Nickel Plated
OHP = Oval Head Phillips
PB = Particle Board
PHP = Pan Head Phillips
PHPS = Pan Head Phillips Sems
SMA = Sheet Metal "A" Point
SMB = Sheet Metal "B" Point
SS = Stainless Steel
TF = Thread Forming
ZI = Zinc Plated
Height:541 mm (18 in.)
Depth:254 mm (10 in.)
Weight:11.83 kgs (26 lbs)
Speakers:Width:245 mm (9.65 in.) Height: 439 mm (17.5 in.)
Depth:241 mm (9.5 in.)
Weight:3.3 kgs (7.25 lbs)
Power Tower:Width: 254 mm (10 in.)
Height: 451 mm (18 in.)
Depth: 178 mm (7 in.)
Weight: 5.23 kgs (11.5 lbs)
Tower Footprint: 241 x 298 mm (9.5 x 11.75 in.)
Microphone: Dynamic Cardioid, balanced
Microphone Cable: XL -Male to XL-Female, 6 m (20 feet)
Speaker Cables: 1/4 in. to 1/4 in., 9 m (30 feet)
Ω
Ω
Ω
Ω, both channels driven with THD < 1%
Ω
3
0 dBu is referenced to 0.775 volts rms
Product specifications are subject to change without notice
SERVICE NOTES
The following describes the procedure to dismantle
the P-80 Cabinets.
STEP A: P-80 CABINETS
A1. Unscrew four M4 machine screws on each
side of the left and right hatches.
A2. Unscrew two M3 pan-head machine screws
on the handle cover and detach it.
A3. Place the unit upside down. Unscrew eight M4
self-tapping screws off the foot standers.
A4. Detach the foot standers. There are six M3
self-tapping screws in the middle portion.
A5. Unscrew three M3 self-tapping screws located
on the right-hand-side.
A6. Place the unit in the normal position.
A7. Locate the four M3 and two M4 self-tapping
screws on the top and unscrew them.
A8. Separate the left and right cabinets.
A9. Locate the UHF and VHF antennas on the
right and left cabinets respectively.
A10. De-solder both antennas.
A11. Unscrew three M3 self-tapping screws on left
and right side panels of the tower metal assembly.
A12. Unscrew eight M2.6 and six M3 self-tapping
screws.
A13. Detach the left and right metal side panels.
A14. Detach the 8-pin antenna connector.
A15. Detach the top metal cover.
A16. Unscrew seven M3 self-tapping screw on the
rear panel
A17. Detach all connectors.
A18. The procedure is completed.
STEP B: P-80 MIXER PCB
B1. Detach 14 knobs and their nuts.
B2. Detach the Reverb PCB assembly.
PASSPORT
(This is the model name for warranty claims)
B3. Unscrew nine M3 machine screws from the
mixer PCB assembly.
B4. Detach all connectors.
B5. The procedure is completed.
STEP C: P-80 DSP REVERB PCB
C1. Detach all connectors.
C2. The procedure is completed.
STEP D: P-80 INPUT PCB
D1. Unscrew six screws and nuts from the front
panel.
D2. Detach all connectors.
D3. The procedure is completed.
STEP E: P-80 POWER AMP PCB
E1. Unscrew four screws connecting the heatsink
to the side brackets (two on either side of
tower).
E2. Detach all connectors.
E3. The procedure is completed.
STEP F: P-80 SMPS PCB
F1. Unscrew three screws from the front panel.
F2. Detach all wiring and connectors.
F3. Unscrew six screws from the top cabinet of
the SMPS.
F4. Unscrew three screws from the bottom cabi-
nets of the SMPS.
F5. Detach the spacer from the wiring of the
SMPS.
F6. Unscrew the earthing M4 nut.
F7. Detach the mains connector from the AC inlet.
F8. Unscrew five screws from the SMPS PCB as-
sembly
F9. The procedure is completed.
P-80
®
4
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-
*) in the Part
CIRCUIT DESCRIPTION
This section provides concise information about new
or unusual circuitry 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 information wherever possible.
The P-80 consists of the following modules.
1. Mixer Section
2. Digital Reverb Section
3. Signal Processor Circuit and System EQ Circuit
4. Power Amplifier
5. Switch Mode Power Supply Unit (SMPSU)
Mixer Section
The mixer section is mainly made up of operational
amplifiers as gain stages and therefore a technical
description will not be used here. Following is a basic circuit description to familiarize you with the
layout of the circuit.
The Mic/line section is made up of 3 microphone /
line inputs each with a first stage preamplifier for
balanced or unbalanced inputs (locate on the mixer
board). Line inputs can operate as either balanced
or unbalanced if TRS or TR 1/4” jacks are used respectively. Gain selection of 1dB/+30dB is made by
switching a different value resistor in the input
stage. At this point on channel one, the signal is
picked off for the VIP control ducking circuit made
up of U1B. After the input stage there is one knob
for contour control, followed by an auto-pad level
control where the signal splits off into the rev/aux
bus and main signals with the main signals going to
a pan circuit. Here the main signal is split between
5
®
PASSPORT
(This is the model name for warranty claims)
tact the FMIC Customer Service Department to
order the complete PCB Assembly.
left and right channel signal bus. Channel three also
has an additional input via a pair of RCA connectors
where the signals are summed into mono which
may be used as an auxiliary audio signal input. This
circuit consists of an auto-pad level control, low frequency and high frequency tone controls, and a
rev/aux send control.
The audio bus is connected to three FETs that perform ducking of the signals on the bus with the
exception of channel one which is the drive circuit
for the VIP ducking circuit. This function is provided
by U1B.
Bus signals are buffered by U8A and drive the tape
out connections and the main master level control
circuitry made up of U9A. Rev/Aux signals are buffered by U12B and feed the mono aux send output.
The main level control is auto-pad configured and
drives the speaker EQ circuitry made up of U10A.
Note: Channel 1 Mic/Line reverb function will be affected by VIP control making announcements on
Channel 1 dry.
The mixer board also contains part of the signal
processor circuit and the system EQ circuit for the
power amplifier. These circuits are an integral part
of the power amplifier and appear after the return
signal path.
These circuits will all be discussed later in this
document.
Digital Reverb Section
The DSP Reverb PCB module receives the input
REV/AUX signals at pin 4 of connector CN401. The
P-80
DSP Reverb’s IC’s consist of U404 (AL1101 ADC),
U405 (AL1201 DAC), and U406 (AL3201B). The
outputs from U405 are fed to U402B and then buffered by U402A before feeding back to pin 6 of CN
401.
Signal Processor Circuit and System EQ Circuit
The signal processor is partially located on the
mixer board but is an integral part of the power amplifier section. The operation of this circuit is
performed by filtering the signal from U11A which
drives the bases of Q5 and Q7 to control the voltage level at FETs Q4 and Q6 respectively. This in
turn changes the filter characteristics of circuits
which at low levels boosts the low and high frequencies of the signal. At high signal levels with the
gate voltages approaching or at 0v, the circuit lowers the boost of the low frequencies in response.
This circuit is post aux return and therefore does
not modify the response of the signal at the aux
send outputs.
Power Amplifier
Note: In cases where the amplifier circuits are identical between the left and right channel. Only
components related to the left channel will be discussed for simplicity.
The first stage of the power amplifier is made up of
op amp U201A that acts as the input buffer and
muting circuit for minimization of turn on/off pops.
Q202 in balance with the input resistors of this circuit are designed to provide a deep muting effect.
This circuit will be called into action if the temperature of the heat sink also rises above 80 degrees
Centigrade. (Typical HS temperature is around 50
for normal operation). The output of the first stage
feed trimmer resistor VR201 which are part of the
balanced input section of low noise op-amp U203A
which sets the amplifier gain (factory set at approximately 30.5dB). The output of the second
stage directly drives the biased gates of lateral
power FETs Q205 and Q208.
PASSPORT
(This is the model name for warranty claims)
Speaker short circuit protection is provided by
U203B. This is accomplished when the output is
shorted to ground, the normal differential signal applied to U203B is absent at the negative terminal
while at the same time, the second stage is now
forced into open loop gain. The drive signal is integrated into C211 forcing a positive voltage at the
output of U203B that pulls the gate of FET Q207
into conduction from its previous negative bias off
point, nulling the output of U203A. With the output
of U203A minimized the output current of the amplifier is minimized until the short is removed. At this
time, C211 will discharge allowing normal operation
of the amplifier. Note: Some small DC offset will be
present when the amplifier is in the short circuit protect mode.
The power amplifier board also provides the ±15v
for the mixer/reverb boards as well as the supply for
the SMPSU FAN and the LED PCB which indicated
power. The power amplifier board is also connected
to the GM type fuse holder and aux DC power input
connector.
Switch Mode Power Supply Unit (SMPSU)
This unit is not recommended to be serviced in
the field except by replacing the complete module as a total assembly.
The following information is provided to assist in the
trouble shooting of the unit. Please not that the
mains fuse must be replaced with exactly the same
grade of fuse for safety regulations and to avoid risk
of damage and potential fire hazard.
The mains input to the SMPSU allows for operation
from 100V to 240V. The output of the SMPSU is
±36V DC for the main power supply rails of the
power amplifier. The unit also has connectors for
mains power input, mains power switch and chassis, earth and signal grounds.
Service Tip: You can connect to the aux DC input
(with GM fuses installed) to test the output voltage
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!
P-80
®
6
The SMPSU incorporates protection circuits other
than the fuses including over current protection. All
parts contained in the SMPSU should be considered 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 contained
in this module are deadly.
Service Notes on Changes and Updates
7
®
PASSPORT
(This is the model name for warranty claims)
Refer to the mixer schematic diagram of this manual 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 artifact at the tail of the ducking action. This was
mainly detected on UL voltage settings. 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 performed on
individual units that are listed below by S/N. All
other UL units have been modified by the factory.
shaded Unique Fender® part. Order directly from the FMIC Parts Department.
shaded + * Access to this part or assembly is controlled. Please contact the FMIC Customer Service Department.
** Safety Requirement part. Replacement must match Safety Agency…–Value, if specified –Type, if specified –Approval Mark(s) if on part.
shaded + ** Both a unique Fender® part and a Safety Requirement part as defined above.
shaded Unique Fender® part. Order directly from the FMIC Parts Department.
shaded + * Access to this part or assembly is controlled. Please contact the FMIC Customer Service Department.
** Safety Requirement part. Replacement must match Safety Agency…–Value, if specified –Type, if specified –Approval Mark(s) if on part.
shaded + ** Both a unique Fender® part and a Safety Requirement part as defined above.
shaded Unique Fender® part. Order directly from the FMIC Parts Department.
shaded + * Access to this part or assembly is controlled. Please contact the FMIC Customer Service Department.
** Safety Requirement part. Replacement must match Safety Agency…–Value, if specified –Type, if specified –Approval Mark(s) if on part.
shaded + ** Both a unique Fender® part and a Safety Requirement part as defined above.
shaded Unique Fender® part. Order directly from the FMIC Parts Department.
shaded + * Access to this part or assembly is controlled. Please contact the FMIC Customer Service Department.
** Safety Requirement part. Replacement must match Safety Agency…–Value, if specified –Type, if specified –Approval Mark(s) if on part.
shaded + ** Both a unique Fender® part and a Safety Requirement part as defined above.
shaded Unique Fender® part. Order directly from the FMIC Parts Department.
shaded + * Access to this part or assembly is controlled. Please contact the FMIC Customer Service Department.
** Safety Requirement part. Replacement must match Safety Agency…–Value, if specified –Type, if specified –Approval Mark(s) if on part.
shaded + ** Both a unique Fender® part and a Safety Requirement part as defined above.
shaded Unique Fender® part. Order directly from the FMIC Parts Department.
shaded + * Access to this part or assembly is controlled. Please contact the FMIC Customer Service Department.
** Safety Requirement part. Replacement must match Safety Agency…–Value, if specified –Type, if specified –Approval Mark(s) if on part.
shaded + ** Both a unique Fender® part and a Safety Requirement part as defined above.
POWER AMP- PCB ASSEMBLY
CN202
LED- PCB ASSEMBLY
PACKING MATERIALS
LATCH LOCKER CASING MATERIALS
®
P-80
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