Passport_PD-250_Service_Manual 电路图.pdf

《Passport_PD-250_Service_Manual 电路图.pdf》由会员分享，可在线阅读，更多相关《Passport_PD-250_Service_Manual 电路图.pdf（36页珍藏版）》请在收音机爱好者资料库上搜索。

1、PASSPORT POWERED PORTABLE SOUND SYSTEM SERVICE MANUAL PN: 007-0399-000 FENDER PASSPORT PN: 069-2001-003 CONTENTS Specification . . . . . . . . . . . . . . . . . 4 Theory of operation . . . . . . . . . . . . 5 Service notes and changes . . . . . . 7 Parts Lists: Mixer Board . . . . . . . . . . . . .

2、. . 8 1/4” Phone Jack Board . . . . . . 10 Mic/Line Board . . . . . . . . . . . . . 10 Digital Reverb Board . . . . . . . . 11 Stero Power Amp Board . . . . . 12 Protection Board . . . . . . . . . . . 13 RCA Tape Output Board . . . . . 14 LED Indicator Board . . . . . . . . 14 Wireless REG Assy . .

3、. . . . . . . 14 SMPSU Board . . . . . . . . . . . . . 14 Main Tower Assy . . . . . . . . . . . 17 Wireless REG Casing Assy . . 19 Speaker Cabinet Assy . . . . . . 19 Packing Accessories . . . . . . . . 20 Quick Service Modules . . . . . . 20 Export Standard Spares Kit . . . 21 Block Diagram . . . .

4、 . . . . . . . . . . . . 22 Schematic Diagrams . . . . . . . . . . . 23 PCB Layout Drawings . . . . . . . . . . 27 Exploded View Diagrams . . . . . . . . 33 Fender Musical Instruments Corp. 7975 North Hayden Road Scottsdale, AZ 85258 Model: PD-250 RadioFans.CN 收音机爱 好者资料库 2 THIS PAGE IS INTENTIONALLY

5、 LEFT BLANK RadioFans.CN 收音机爱 好者资料库 PASSPORT POWERED PORTABLE SOUND SYSTEM 3 Feb. 2002 REV A IMPORTANT NOTICE The information contained herein is CONFIDENTIAL and PROPRIETARY to Fender Musical Instruments Co. It is disclosed solely for the use by qualified technicians for the purposes of equipment m

6、aintenance and service. It is not to be disclosed to others without the express written permission of Fender Musical Instruments Corporation. All specifications subject to change without notice. For warranty repair service, only Fender specified part numbers are to be used. It is recommended they al

7、so be used for post-warranty maintenance and repair. Parts marked with an asterisk(*) indicated the require use of that specific part. This is necessary for RELIABLILITY and SAFETY requirements. DO NOT USE A SUBSTITUTE! A coded naming convention is used in the description of certain parts. The codes

8、 and what they mean are as fol- lows: CAPACITOR CODES HARDWARE CODES CAP AE= Aluminum ElectrolyticBLX= Black Oxide CAP CA= Ceramic AxialCR= Chrome Plated CAP CD= Ceramic DiskHWH= Hex Washer Head CAP MO= Ceramic MonolithicM= Machine Screw CAP MPF= Metalized Polyester FilmNI= Nickel Plated CAP MY= Myl

9、arOHP= Oval Head Phillips CAP PFF= Polyester Film/FoilPHB= Pan Head Phillips PHPS= Pan Head Phillips Sems RESISTOR CODES SMA= Sheet Metal A Point SMB= Sheet Metal B Point RES CC= Carbon CompSS= Stainless Steel REW CF= Carbon FilmTF= Thread Forming RES FP= Flame ProofZI= Zinc Plated RES MF= Metal Fil

10、m RES WW= Wire Wound SERVICE MANUAL RadioFans.CN 收音机爱 好者资料库 PASSPORT POWERED PORTABLE SOUND SYSTEM 4 SPECIFICATIONS When we use the term dB to indicate a voltage amplification factor (gain), no reference is implied. 101 dB of Voltage Amplification means that if you take 20 time the Log (base 10) of

11、the output voltage divided by the input voltage, the answer will be 101 dB When we use the term dBu to indicate a voltage level, we are implying a 0.775 volt reference voltage level. Thus, a voltage level expressed as +4 dB was calculated by taking 20 times the log (base 10) of the actual voltage (1

12、.23 volts) divided by the reference voltage (0.775 volts) The choice of a 0.775 volt reference was not arbitrary. dBm is a common method of rating power levels (as opposed to our voltage level ratings). The 0 dBm reference is one milliwatt (1/1000th watt). If an output device pro- duces 0 dBm into e

13、xactly 600 ohms, the voltage level is 0.775 volts. Thus, for true 600 ohm lines, the dBm power terminology and our dBu voltage terminology are equivalent. Specifications are subject to change without notice. System: Frequency Response:20Hz. to 40kHz 1dB (at tape output) 30Hz. to 30kHz 2dB (at speake

14、r output with processor threshold exceeded) Distortion:70dB 1W, DIN A Processor Frequencies:Level sensitive with boost at 70Hz. and 15kHz. Microphone EQ:Specially designed combinations of boost and cut. Stereo EQ:12dB 50Hz., 15dB 15kHz. System EQ:Specially designed for differing acoustic environment

15、s. Gain Stages:+54dB 2dB (Microphone input to send outputs) (Gain Switch set to high)+24dB 2dB (line input to send output) +0dB 2dB (Stereo to tape output) +12dB 2dB (Stereo to send output) +32dB 2dB (Return to speaker output) Power Output:125W/CH 8 ohms with both channels driven with THD 40dB 1kHz.

16、 Aux Return Sensitivity:0dBu for rated output power 1kHz. PASSPORT POWERED PORTABLE SOUND SYSTEM 5 THEORY OF OPERATION 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

17、description to familiarize you with the layout of the circuit. The first section is made up of 4 microphone / line inputs each with a first stage preamplifier for balanced or unbal- anced inputs (found on Mic input board), one knob contour control, auto-pad level control where the signal splits off

18、into rev/aux send and main signals with the main signals going to a pan circuit. Here the main signal is split between left and right channel signal bus. The second mixer section consists of two stereo pair inputs with RCA and 1/4 stereo phone jack connections. This circuit consists of an auto-pad l

19、evel control, low frequency and high frequency tone controls, rev/aux send control and balance control with signals feeding the left and right audio bus. The audio bus is connected to three FETs which perform ducking of the signals on the bus, with the exception of Channel One, which is the drive ci

20、rcuit for the VIP ducking circuit. This function is provided by U2A. Bus signals are buffered and drive the tape output connections and are directed by SW1A/B which performs the function of switch- ing this signal as left and right main with reverb mix or left and right summed into left and aux sign

21、al on right chan- nels. Main left and right level controls are auto-pad confirguration and drive the send output connectors. 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 circ

22、uit 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 digital reverb section utilizes a digital reverb IC M6584

23、1SP (IC402) and one dual op amp (IC401A/B) to perform the reverb function. +5v regulation is on board with input voltage derived from the +15v supply. RC filters make up the timing functions and gain levels of the processor with regeneration and line driving provided by IC401A/B and regen mix provid

24、ed by VR401(this part may be fixed resistor on later models). Foot switch control of the reverb facil- ity is provided and controlled by TR401 which controls the logic level at pin 2 of IC402 Reverb function is mono but fed to both right and left busses. Signal Processor Circuit and System EQ Circui

25、t 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 level detecting (Z204/207 on amp board) and storing (D204/205/209/210, C215, 230 on amp board) the output peaks of the power amplifier

26、to create approximately 0v bias at the gate of FET Q4 and Q5 on the mixer board. This in turn changes the filter characteristics of circuits made up around U16A/B 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,

27、 the circuit becomes flat in response. This circuit is post return and therefore does not modify the response of the signal at the send outputs. PASSPORT POWERED PORTABLE SOUND SYSTEM 6 THEORY OF OPERATION Power Amplifier NOTE: In cases where the amplifier circuits are identical between the left and

28、 right channel. Only components relat- ed to the left channel will be discussed for simplicity. The first stage of the power amplifier after the processor is comprised of FET Q201 which performs muting during power up and down of the unit. This is accomplished by controlling the gate voltage of the

29、FET Q201 and the charge on C203. At initial power up the FET is biased on as the voltage across the gate is basically 0Vdc. As the negative rail increases, Z201 and R204 apply a negative voltage to the gate biasing Q201 into the off state. At power down, the gate of Q201 is pulled high with R203 and

30、 D201 as the negative rail collapses. The first stage fo voltage amplification is performed by a discrete differential circuit comprised of Q202, 203, 204, 205. Each end of the differential pair provides drive to pre-driver complimentary transistors Q206, 209 and Q207, 210, the outputs of which are

31、effectively summed through biasing transistor Q208 and VR202. It is interesting to note that if VR202 should become open circuited, bias current will be minimized and not destroy the output devices. Adjustment of VR202 is mainly to minimize crossover distortion at low signal levels as with conventio

32、nal amplifiers. Gain of this stage is determined by R217 (4.7k) / R205 (120) or 4.7K /120=39.17. In terms of dB we have, 20 x log (base 10) of 39.17 = 31.85 dB. Distortion is minimized with negative feedback to one side of the differential pair allowing for low distortion. Typical distortion may be

33、as low as 0.05% THD up to clipping. The driver stage is a proprietary design which performs three main functions and is comprised of Q211, 213. Firstly, this stage utilizes a bootstrap circuit made up of Z202, 203, C210, 211, D202, 203 and R228. This circuit allows the driver transistors to swing ab

34、ove the rails eliminating the need for a higher voltage tap from the power supply and at the same time, minimizing the power dissipation in the drivers. Trickle current is supplied to the drivers during initial power up through R225, 226 after which the bootstrap takes over. Secondly, having the dri

35、vers in this configuration allow the output to swing closer to the rails and keeps the drivers from clipping before the output devices. The third function of this circuit is that if the speaker outputs are shorted to ground, the drive to the output devices is mini- mized since the bootstrap circuit

36、is discharged and only the trickle current is supplied to the driver stage, thus pro- tecting the amplifier SOA. The output section is comprised of Q212, 215 and Q214, 216 in a two up and two down configuration further increasing the amplifier SOA. Additional output protection is provided by the swi

37、tched mode power supply which is discussed later. PASSPORT POWERED PORTABLE SOUND SYSTEM 7 THEORY OF OPERATION 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 prov

38、ided to assist in the trouble shooting of the unit. Please note 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 90-130V in 115V setting and 19

39、0-250V in the 230V set- ting. The output of the SMPSU is 15V DC to power the operation amplifiers and K51V dc for the main power sup- ply rails of the power amplifier. The unit also has connectors for the LED status indicators, main power switch, amplifier protect circuit and auxiliaries 36V dc Inpu

40、t for an optional DC-DC converter for 12Vdc operation. SER- VICE TIP: You can connect to the auxiliaries Input 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 t

41、erminals. The SMPSU incorporates several protection circuits other than the fuses, including over current protection in which the unit will shut down and the protect LED will light and must be reset with the main power switch. Secondly, the unit will protect itself if the voltage on the rails sags t

42、o below 33V dc after which it will go into protect mode. The reason for this is that during normal operation with 8 ohm loading, the rails will remain at about 48V dc and with 4 ohm loading are allowed by design to sag to around 36V at full output. If loads lower than this are applied, either the ra

43、ils will sag lower or the current will be exceeded and the unit will go into the protection mode. The protection PCB connected to the amplifier board serves this purpose. Service Notes on Changes and Updates Mixer Board VIP circuit values for Z1 and R11 have been changed from 4.7V to 10V and 2.2M to

44、 1M respectively after the first 100 sets production. This allows more even channel ducking and shorter ducking recovery time. Please update early sets if returned for servce. Stereo Power Amplifier circuit values for Z201, and R206 have been changed from 4.7V to 6.8V and 10K to 1K respectively afte

45、r the first 100 sets production. These changes improve turn off transient pop noise. Please update early sets if returned for service. Digital Reverb circuit value for VR401 is a fixed resistor with a value of 18K. This resistor controls the reverberation regeneration feedback and its value may vary

46、 from model to model depending on the local requirements. 18007-0001-000GP IC DUAL OP AMP TL072/T1U1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,12,13, 14, 15, 16, 17, 18 6007-0002-000GP DIODE 1N4148 D1,2,3,4,5,6 2007-0003-000GP DIODE ZENER 10V 1/2W 5%Z1 5007-0004-000GP XSTR N-CH JFET J112 TO-92Q1,2.3.4.5 1007-

47、0022-000GP WIRE AWG#22VR 3A PIN 2 TO 3 6007-0005-000GP CAP MY.0015F 100V10%C2,14,23,32,79,82 4007-0006-000GP CAP MY.0047F 100V10%C86 ,87,88,89 6007-0007-000GP CAP MY.001F100V10%C46,47,59,60,74,76 4007-0008-000GP CAP MY.015F100V10%C3,15,24,33 4007-0009-000GP CAP MY.022F100V10%C48,49,61,62 4007-0010-0

48、00GP CAP MY.047F100V10%C92,93,94,95 2007-0012-000GP CAP CD22pF50V10%C70,71 14007-0013-000GP CAP CD33pF50V10%C7,9,19,21,28,30,39,42,43,52,55,56,65 8007-0014-000GP CAP CD47pF50V10%C5,17,26,35,50,51,63,64 2007-0015-000GP CAP CD100pF50V10%C78,81 4007-0016-000GP CAP CD680pF50V10%C4,16,25,34 22007-0017-00

49、0GP CAP AE1F50V20% C6,8,10,18,20,27,29,36,38,40,41,44, 45, 53, 54, 57,58,69,72,73,84,85 13007-0018-000GP CAP AE.47F50V20% C1,13,22,31,66,67,68,75,77,80,83 1007-0019-000GP CAP AE10F25V20% C12 3007-0020-000GP RES CF1/8W5%100R102,103,106 3007-0021-000GP RES CF1/8W5%470R88,89,90 1007-0022-000GP RES CF1/8W5%680R9 2007-0023-000GP RES CF1/8W5%1KR117,118 1007-0024-000GP RES CF1/8W5%2.2KR10 2007-0400-000 GP RES CF1/8W5%3.3KR119,121 8007-0026-000GP RES CF1/8W5%6.8KR120,122,125,126,127,128,137,138 10007-0027-000GP RES CF1/8W5%10KR57,58,74,75,83,85,95,99,100,104 4007-0028-000GP R