Table of Contents
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Safety Information ............................................................................................................................ 3
Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 4
Warranty Information ....................................................................................................................... 4
Table 1. Amplifier Comparison Chart ................................................................................................ 4
AmPlus™ 100 Amplifier Specifications ......................................................................................... 5
AmPlus 50 Amplifier Specifications ............................................................................................... 6
AmPlus 100 Theory of Operation .............................................................................................. 7-10
AmPlus 50 Theory of Operation ................................................................................................... 11
Figure 1. AmPlus 100 Amplifier block diagram ............................................................................... 12
Figure 2. AmPlus 50 Amplifier block diagram ................................................................................. 13
AmPlus 100 Amplifier Controls................................................................................................ 14-15
AmPlus 50 Amplifier Controls....................................................................................................... 16
Disassembly/Assembly Procedures ....................................................................................... 17-18
Figure 3. AmPlus 100 Amplifier exploded view .............................................................................. 19
Figure 4. AmPlus 50 Amplifier exploded view ................................................................................ 20
AmPlus 100 Test Setup Parameters ............................................................................................. 21
Table 2. AmPlus 100 Initial Switch Settings ................................................................................... 21
Table 3. AmPlus 100 Signal Inputs table ........................................................................................ 21
Table 4. AmPlus 100 Signal Outputs table ..................................................................................... 21
AmPlus 100 Test Procedures ................................................................................................... 22-25
Table 5. Source Input to 70/100V Speaker Output test table ......................................................... 22
Table 6. Source Input to 4Ω Speaker Outputs ............................................................................... 24
Table 7. Bass Performance tests ................................................................................................... 24
AmPlus 50 Test Setup Parameters ............................................................................................... 26
Table 8. AmPlus 50 Initial Switch Settings ..................................................................................... 26
Table 9. AmPlus 50 Signal Inputs table .......................................................................................... 26
Table 10. AmPlus 50 Signal Outputs table ..................................................................................... 26
AmPlus 50 Test Procedures ..................................................................................................... 27-30
Table 11. Source Input to 70/100V Speaker Output test table ....................................................... 27
Table 12. Source Inputs to 4Ω Speaker Output ............................................................................. 29
Table 13. Bass Performance tests ................................................................................................. 29
Installation Diagram Notes: ........................................................................................................... 31
Figure 5. AmPlus 100 Simple Mono Installation ............................................................................. 32
Figure 6. AmPlus 100 Large Mono Installation using Mixer Feature.............................................. 33
Figure 7. AmPlus 100 70/100 Volt Mode/Model 1B Acoustimass
Figure 8. AmPlus 100 Installation with Two 70/100V Listening Zones ........................................... 35
Figure 9. AmPlus 50 Simple Mono Installation............................................................................... 36
Part List Notes ................................................................................................................................ 37
Main Part List AmPlus 100 Amplifier (see Figure 10) ................................................................. 38
Figure 10. AmPlus 100 Amplifier exploded view ............................................................................ 39
Main Part List AmPlus 50 Amplifier (see Figure 11) .................................................................... 40
Figure 11. AmPlus 50 Amplifier exploded view .............................................................................. 41
Electrical Part List ..................................................................................................................... 42-46
Resistors ................................................................................................................................... 42-43
Capacitors ................................................................................................................................. 43-44
Diodes ............................................................................................................................................ 44
Transistors...................................................................................................................................... 44
Integrated Circuits .......................................................................................................................... 45
Miscellaneous ........................................................................................................................... 45-46
CONTENTS
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Bass Module Installation ......... 34
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Table of Contents
Related Manuals for Bose AMPLUS 50
Summary of Contents for Bose AMPLUS 50
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Page 1: Table Of Contents
Main Part List AmPlus 100 Amplifier (see Figure 10) ..............38 Figure 10. AmPlus 100 Amplifier exploded view ................39 Main Part List AmPlus 50 Amplifier (see Figure 11) ..............40 Figure 11. AmPlus 50 Amplifier exploded view ................41 Electrical Part List ........................ - Page 2 Figure 15. AmPlus 100 Accessory Transformer exploded and packing view ......... 51 Part List AmPlus 50 and 100 Amplifier Rack Mount Accessory Kit (see Figure 16) ....52 Figure 16. AmPlus 50 and 100 Amplifier Rack Mount Accessory Kit ..........52 Device Pin-out Diagrams ......................
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Page 3: Safety Information
SAFETY INFORMATION 1. Parts that have special safety characteristics are identified by the symbol on schematics or by special notes on the parts list. Use only replacement parts that have critical characteristics recommended by the manufacturer. 2. Make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit before returning the unit to the customer. -
Page 4: Electrostatic Discharge Sensitive (Esds) Device Handling
WARRANTY INFORMATION The following products are covered by a 5-year transferable limited warranty. • Bose ® AmPlus™ 100 and AmPlus 50 • Equalizer Card ® • Optional Opti-Voice Page card • Optional Source Input expansion card Table 1. -
Page 5: Amplus™ 100 Amplifier Specifications
AMPLUS™ 100 AMPLIFIER SPECIFICATIONS Power Output Special Features Stereo: 65W per channel into 4Ω Remote volume control 50W per channel into 8Ω Turn on/off muting 70V bridged mono: 100W into 98Ω Clip detection and limiter Ω 70V/4 : 50W @ 70V output into 98Ω Short circuit protection 65W @ Ch2 output into 4Ω... -
Page 6: Amplus 50 Amplifier Specifications
AMPLUS™ 50 AMPLIFIER SPECIFICATIONS Power Output Special Features 70V Mono: 50W into 98Ω Remote volume control Ω Mode: 70W outputs into 4Ω Turn on/off muting Clip detection and limiter Short circuit protection Input Sensitivity DC offset protection 315mV required to drive amplifier to full Thermal limiting power in any mode. -
Page 7: Amplus 100 Theory Of Operation
AMPLUS™ 100 THEORY OF OPERATION Introduction: The AmPlus 100 Business Music Amplifier is a two channel amplifier intended for business music and other installed sound systems. Its two inputs pass through the Opti-Voice ® Page and Opti-Source™ Option Cards and Equalizer cards, if they are installed. These cards expand the number of inputs and outputs of the basic AmPlus 100, adding special features of paging, source selection, and priority override. - Page 8 AMPLUS™ 100 THEORY OF OPERATION Sheet 1 of 3 (continued) Note that the U104/105 output is also taken directly, before the EQ card, to two of the volume control VCAs (U204A, D), for use as Line Outputs. U204B, C implement the volume control for the main CH1 and CH2 paths that will move forward in the AmPlus 100 itself.
- Page 9 AMPLUS™ 100 THEORY OF OPERATION Sheet 2 of 3 (continued) Finally, the bass boost signal from the dynamic EQ path rejoins the other signals, (the full range signal, high pass filtered if S4 is in the HP IN position, via S4 and R381, and the manually adjusted bass boost signal via R4 and U300B) in the summing stage U300A [C4].
- Page 10 AMPLUS™ 100 THEORY OF OPERATION Sheet 3 of 3 (continued) The power amplifier is equipped with a clip detector circuit, implemented with U503 [D7], an LM311 comparator, and associated parts. The comparator watches the differential input voltage at the power amplifier input pins and compares it to 120mV. If the power amplifier, a feedback amplifier, is for any reason unable to deliver the output voltage requested by the source, linear operation ceases and an error voltage develops across its input pins.
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Page 11: Amplus 50 Theory Of Operation
The output connector provides either 4 ohm or 70/100V CV, (Constant Voltage) outputs, as selected by S6 for Ch 1. Sheet 3 of 3 The AmPlus 50 version is identical except that only the Ch 1 power amplifier module is installed. -
Page 14: Amplus 100 Amplifier Controls
2. Dual Mono - The Channel 1 and Channel 2 inputs are summed to mono and presented to the power amplifiers as two mono signals. This mode may also be used when driving a 70V load from the Channel 1 amplifier outputs and a Bose ®... - Page 15 AMPLUS™ 100 AMPLIFIER CONTROLS BASS INPUTS A INPUT LEVEL REMOTE LINE OUTPUT POWER AMPLIFIER LEVEL MODE VOLUME Zone 2 ZONE 1 ZONE 2 ZONE 1 ZONE 2 ZONE1 ZONE 2 MODE Ω Ω 4-16 4-16 dual mono mono -40 dB -40 dB -40 dB OFF +10 OFF +10...
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Page 16: Amplus 50 Amplifier Controls
70/100V 4-16 Inputs - The AmPlus 50 amplifier comes with two balanced inputs. They can be left or right. Two mono sources can also be mixed. Since the AmPlus 50 is a single channel amplifier, a stereo source is internally summed to mono. -
Page 17: Disassembly/Assembly Procedures
DISASSEMBLY/ASSEMBLY PROCEDURES 1. Top Cover Removal 4. Main PCB Replacement Note: Refer to Figures 3 and 4, as 4.1 Orient the main PCB (8) so that the applicable, for the following procedures. connectors are aligned with the rear panel of the amplifier chassis (16), and slide the Note: The numbers in the parentheses main PCB into place. - Page 18 DISASSEMBLY/ASSEMBLY PROCEDURES 7. Power Transformer Removal 10. Audio Transformer Replacement 7.1 Remove the top cover (2) using 10.1 Place the audio transformer (3) into procedure 1. the amplifier chassis (16) with the wires facing toward the main PCB (8), aligning it 7.2 Unplug the transformer cables at J601 over the amplifier chassis studs.
- Page 19 (5 PLACES) (7 PLACES) (6 PLACES) (4 PLACES) (4 PLACES) (2 PLACES) (2 PLACES) Figure 3. AmPlus™ 100 Amplifier Exploded View...
- Page 20 (5 PLACES) (7 PLACES) (6 PLACES) (3 PLACES) (2 PLACES) (2 PLACES) Figure 4. AmPlus™ 50 Amplifier Exploded View...
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Page 21: Amplus 100 Test Setup Parameters
AMPLUS™ 100 TEST SETUP PARAMETERS Table 2. AmPlus 100 Initial Switch Settings Control Name Reference Designator Default Setting Input Mode S1 switch Left (2-Channel/stereo) Source Trim - Channel 1 R1 potentiometer CW (no attenuation) Source Trim - Channel 2 R2 potentiometer CW (no attenuation) Zone 2 Trim R3 potentiometer... -
Page 22: Amplus 100 Test Procedures
AMPLUS™ 100 TEST PROCEDURES Test Setup Notes: 5. Source Input 1 and 2 (summed internally) to 70/100V Output. 1. This amplifier is designed to be used with balanced inputs at J1. If you have a 6. For the following tests, refer to Tables 3 signal generator capable of supplying a and 4 for Signal Input and Signal Output balanced input, refer to the balanced inputs... - Page 23 AMPLUS™ 100 TEST PROCEDURES 1.4 The output level at J5 should be 5. Noise Test; +3.5dBr ± 1dB (balanced inputs), or Source Input to 70/100V Speaker +13.5dBr ± 1dB (unbalanced inputs). Outputs 2. Gain Test; 5.1 Set up the unit under test as listed in Source Input to 70V/ 100V Speaker the Test Setup Notes section.
- Page 24 AMPLUS™ 100 TEST PROCEDURES 7.5 The level should be 115Vrms ± 10.0V 8.3 Reference a dB meter to the input level. with 1.0% + 2.0% THD for 220/ 240V models. 8.4 Perform the 1kHz Gain test as listed in Table 6. Note: For the following tests, set up the unit under test as listed in the Test Setup 9.
- Page 25 AMPLUS™ 100 TEST PROCEDURES 10.3 Reference a dB meter to the output 12.5 Measure the output at the Channel 1 level. This is the reference level. 4Ω Speaker Outputs. It should be -45dBV +5.0dBV. 10.4 Perform the 20Hz and 100Hz tests as listed in Table 7.
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Page 26: Amplus 50 Test Setup Parameters
AMPLUS™ 50 TEST SETUP PARAMETERS Table 8. AmPlus 50 Initial Switch Settings Control Name Reference Designator Default Setting Source Trim - Channel 1 R1 potentiometer CW (no attenuation) Source Trim - Channel 2 R2 potentiometer CW (no attenuation) Bass Adjust... -
Page 27: Amplus 50 Test Procedures
J1, and J4 is 9. Input Voltage Reference shall be 188620-001. The part number for the J6 the actual input voltage present at the connector is 190694-004 for the AmPlus 50 input, not the open circuit generator output. amplifier. 1. Gain Test;... - Page 28 AMPLUS™ 50 TEST PROCEDURES 2. Frequency Response Tests; 5. 70/ 100V Speaker Output Full Power Source Input to 70/100V Speaker Test Output 5.1 Set up the unit under test as listed in 2.1 Set up the unit as listed in the Test the Test Setup Notes section.
- Page 29 AMPLUS™ 50 TEST PROCEDURES Note: For the following tests, set up the 7.3 Measure the output level at the Signal unit under test as listed in the Test Setup Outputs at J6. It should be +14.5dBV ± 1.0dB (balanced inputs) or +35.0dB Notes section.
- Page 30 AMPLUS™ 50 TEST PROCEDURES 9. Bass Performance Tests 11. D.C. Offset Test Note: Refer to table 13 for the following 11.1 Set up the unit under test as listed in tests. the Test Setup Notes section. 9.1 Set up the unit under test as listed in 11.2 With both inputs terminated, and with the Test Setup Notes section.
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Page 31: Installation Diagram Notes
INSTALLATION DIAGRAM NOTES The installation diagrams on the following pages are provided to give you an idea as to how this product may be installed in the field, so that you can more easily troubleshoot a problem if the unit has been removed from its installation for you to repair. The diagrams are divided into three sections: 1. - Page 32 Example Listening Zone Source AmPlus™ 100 Remote Volume Control Rear Panel Hookup INPUTS A INPUT LEVEL BASS REMOTE LINE OUTPUT POWER AMPLIFIER MODE LEVEL VOLUME Zone 2 ZONE 1 ZONE 2 ZONE 1 ZONE 2 70/100V ZONE 1 ZONE 2 MODE 4-16 4-16...
- Page 33 Example Listening Zone Source 1 Source 2 AmPlus™ 100 Remote Volume Control AmPlus™ 100 Rear Panel Hookup INPUTS A INPUT LEVEL BASS REMOTE LINE OUTPUT POWER AMPLIFIER MODE LEVEL VOLUME Zone 2 ZONE 1 ZONE 2 ZONE 1 ZONE 2 70/100V ZONE 1 ZONE 2...
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Page 34: Bass Module Installation
Example Listening Zone Source AmPlus™ 100 Model 1B Module Remote Volume Control Rear Panel Hookup INPUTS A INPUT LEVEL BASS REMOTE LINE OUTPUT POWER AMPLIFIER MODE LEVEL VOLUME Zone 2 ZONE 1 ZONE 2 ZONE 1 ZONE 2 70/100V ZONE 1 ZONE 2 MODE 4-16... - Page 35 Example Listening Zone Source Zone 1 Remote Volume Control AmPlus™ 100 Zone 2 Remote Volume Control Accessory 70/100V Transformer Rear Panel Hookup INPUTS A INPUT LEVEL BASS REMOTE LINE OUTPUT POWER AMPLIFIER MODE LEVEL VOLUME Zone 2 ZONE 1 ZONE 2 ZONE 1 ZONE 2 70/100V...
- Page 36 Input Ch. 2 Level 4-16 High Pass Filter Remote High Control Pass 70/100V Power Amp 1 Filter Switch Dynamic Amplifier Mode Switch Bass Bass Boost Gain 4-16 70/100V Power Amplifier Outputs 70/100V 4-16 Figure 9. AmPlus 50 Simple Mono Installation...
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Page 37: Part List Notes
PART LIST NOTES Notes: 1. This part is not normally available from Customer Service. Approval from the Field Service Manager is required before ordering. 2. The individual parts located on the PCB are listed in the part list. This part is critical for safety purposes. Failure to use a substitute replacement with the same safety characteristics as the recommended replacement may create shock, fire, and/or other hazards. -
Page 38: Main Part List Amplus 100 Amplifier (See Figure 10)
179096-04 CLIP, HEATSINK 188598 INSUL. THERMAL COND, TO-220 188642-001 SCREW, MACH, #10-32, PAN, XREC 177637-44 INSUL. THERMAL COND., MULTIWATT 188642-002 HEATSINK, AMPLUS 50/100 187969 CONN ASSY, IEC RECEPT, AMPLUS 190621-001 CHASSIS, BASE, AMPLUS 100 120V 187963-001 240V 187963-002 SWITCH ASSY, DPST, NEON,... - Page 39 (5 PLACES) (7 PLACES) (6 PLACES) (4 PLACES) (4 PLACES) (2 PLACES) (2 PLACES) Figure 10. AmPlus™ 100 Amplifier Exploded View...
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Page 40: Main Part List Amplus 50 Amplifier (See Figure 11)
TRANSFORMER, 70/100V, AUDIO 188600-001 CLIP, HEATSINK, BRIDGE RECT. 188568 NUT, 8-32 HEX W/LKWSHR 100413-2 CLIP, HEATSINK 188599 TRANSFORMER, POWER 187985 PCB ASSY, AMPLUS 50, 120V 187923-001 1, 2 240V 187923-002 1, 2 SCR, MACH, 8-32X 1/4, XREC, DRILK 179096-04 CLIP, HEATSINK 188598 INSUL. - Page 41 (5 PLACES) (7 PLACES) (6 PLACES) (3 PLACES) (2 PLACES) (2 PLACES) Figure 11. AmPlus™ 50 Amplifier Exploded View...
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Page 42: Electrical Part List
ELECTRICAL PART LIST Resistors Reference Designator Description Part Number Notes R1, 2, 3, 4, 5 POT, RTY, 20K, RIGHT 187484-001 ANGLE, LOG TAPER R100, 102, 110, 116, 193, 194, 312, 1.00KΩ, 0805, 1/10W, 1% 133625-1001 342, 412, 502, 503, 506, 507, 512, 514, 517, 520, 521, 524, 537, 538, 547, 549, 561, 563, 607, 711, 713 R101, 103, 111, 117, 606... -
Page 43: Resistors
ELECTRICAL PART LIST Resistors (continued) Reference Designator Description Part Number Notes R366, 378 40.2KΩ, 0805, 1% 133625-4022 R381, 386 4.02KΩ, 0805, 1/10W, 1% 133625-4021 R400, 409 301Ω, 0805, 1/10W, 1% 133625-3010 R402, 403 402Ω, 0805, 1% 133625-4020 R411 3.32KΩ, 0805, 1/10W, 1% 133625-3321 R414, 415, 541, 571 10Ω, 2512, 1W, 5%... -
Page 44: Diodes
ELECTRICAL PART LIST Capacitors (continued) Reference Designator Description Part Number Notes C336, 344, 345, 346 .033uF, BOX, 85, 63V, 5% 137127-333 C338, 343 .12uF, BOX, 85, 50V, 5% 137127-124 C401, 405, 502, 507, 520, 524 .01uF, 0805, X7R, 50V, 5% 133623-1035 C406 .033uF, 0805, X7R, 50V, 10%... -
Page 45: Integrated Circuits
ELECTRICAL PART LIST Integrated Circuits Reference Designator Description Part Number Note U100, 106, 201, 202, 203, 306, OP AMP DUAL, SOIC-8, 187473 NJM4559 U101, 200, 300, 301 0P AMP QUAD, SOIC-14, 187472 NJM2059 U102, 103, 104, 105, 304, 305 OP AMP SWTCH, SOIC-8, 187474 NJM2120 U204... -
Page 46: Miscellaneous
ELECTRICAL PART LIST Miscellaneous (continued) Reference Designator Description Part Number Note J600 CONN, HEADER, 2 POS 143963 J601 HEADER, HIGH 178742-5 CURRENT, 8MM PITCH J602 CONN, HEADER, INLINE, 133220-05 PCB MNT, 5P J7, 7B, 8, 8B CONN, HEADER, 12 137489-12 POS, MALE J9, 10 CONN, HEADER,... -
Page 47: Amplus™ 50 And 100 Accessory Notes
4. The AmPlus 100 Amplifier can be used with the optional CVT-100 Transformer Accessory Kit to allow 70/100V operation in both channels. Refer to Figure 15 for more information. 5. The AmPlus 50 and 100 Amplifiers can be used with optional Equalizer Cards to allow the use of the Free Space ®... -
Page 48: Packing List Power Amplifier Accessory Kit (See Figure 12)
173350 Europe, 220V 173352 Japan, 100V 181690 UK, 240V 173351 Australia, 240V 173354 System Assy, Remote, BMS, Volume, US/Canada 187491-1 Europe 187491-2 Japan 187491-3 187491-4 Australia 187491-5 Connector Kit, AmPlus 50, AmPlus 100 188620-001 Figure 12. Accessory Kit Packing Diagram... -
Page 49: Part List Remote Volume Control (See Figure 13)
PART LIST Remote Volume Control (see Figure 13) Item Description Part Number Number PCB Assy, Rem, BMS, Volume 187983 Wallplate, RVC, (US, CA, AUS) 188611 Wallplate, No Switch, RVC, (EURO, UK) 188610 Cover, Remote, FreeSpace ® 6 (Japan) 178102 Knob, Remote, FreeSpace 6 (All Models) 178104 Screw, Mach, 6-32x1, .00, ovalhd (US/CA) 178115-16... -
Page 50: Packing List Amplus 50 And 100 Amplifier (See Figure 14)
PACKING LIST AmPlus™ 50 and 100 Amplifier (see Figure 14) Item Description Part Number Quantity Number LIT KIT, AMPLUS 50/100, contains: 191954 BROCHURE, ALL PRODUCTS 188898 OWNER’S MANUAL 190652 DECLARATION OF CONFORMITY 188657 REGISTRATION CARD 180089 BAG, POLY, 15X28X4 MIL... -
Page 51: Part List Amplus 100 Amplifier Accessory Transformer (See Figure 15)
PART LIST AmPlus™ 100 Amplifier Accessory Transformer (see Figure 15) Item Description Part Number Qty. per Number Assy. Autotransformer, Accy, 70/100V 193502 Enclosure, Top, Trans. 190662 Enclosure, Bottom, Trans 190661 Screw, Tapp, 4-24, Pan Head 190118-06 Screw, #8-32, Pan Head 190623-008 Nut, Hex, 8-32, Keps 100413-2... -
Page 52: Part List Amplus 50 And 100 Amplifier Rack Mount Accessory Kit (See Figure 16)
AmPlus™ 50 and 100 Amplifier Rack Mount Accessory Kit (see Figure 16) Item Number Description Part Number Q t y . Bracket, Rack Mount 187962 Tube, Packing, with end caps 184177 Poly Bag vendor supplied Instruction Sheet 191958 END CAP Figure 16. AmPlus 50 and 100 Amplifier Rack Mount Accessory Kit... -
Page 53: Device Pin-Out Diagrams
IC, Volt Reg, 12V, Pos, TO-220 BOTTOM VIEW Pin 1. Input Pin 2. Ground Pin 3. Output FRONT VIEW ® Bose P/N: 117921, 2SC536 Bose P/N: 116736, LM 7812 PIN FUNCTION BOTTOM VIEW 1. BASE 2. EMITTER 3. COLLECTOR FRONT VIEW... - Page 54 Pin 1. Ground 2. EMITTER Pin 2. Input 3. COLLECTOR Pin 3. Output Bose P/N: 148596, MMBT3906 Bose P/N: 149009-12, LM 7912 PIN 1. BASE PIN 2. COLLECTOR PIN 3. EMITTER Bose P/N: 170214, GBU6 Rectifier Bose P/N: 172284, TIP141T...
- Page 55 5. OUTPUT 6. B -INPUT 6. B -INPUT 7. B OUTPUT 7. B +INPUT 8. V+ 8. V+ Bose P/N: 187474, NJM2120M Bose P/N: 187473, JRC NJM4559M PIN CONFIGURATION 1. MODE I-IN VCA1 I-OUT 2. I IN1 3. VC1 4. I OUT1...
- Page 56 4. V- 5. Bal 6. Bal/Strobe 7. Output ANODE CATHODE 8. V+ Bose ® P/N: 187477, NJM311M Bose P/N: 187479-001 S2A SMD Diode BOTTOM VIEW INV. INPUT NON-INV. OUTPUT INPUT AMPLIFIER BIAS INPUT FRONT VIEW Bose P/N: 187617, CA3080 Bose P/N: 188634-001, J107...
- Page 57 4. SVR 3. Non-Inverting Input 2. Inverting Input 1. Stand-by Gnd. TOP-VIEW +Vs (signal) +Vs (power) TDA7294 BOOT- STRAP IN+MUTE MUTE MUTE SHORT- THERMAL CIRCUIT SHUTDOWN STANDBY STANDBY PROTECTION STANDY -Vs (power) -Vs (signal) GROUND ® Bose P/N: 170156, TDA7294...
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Page 58: Troubleshooting Tips
TROUBLESHOOTING TIPS 1. General Troubleshooting Procedures 1.1 These units are very flexible in regard to setup and operation, which means that it will be much easier for the customer to install and/or setup the unit incorrectly. Be sure to check that the product was installed properly, and that all switches are in the correct positions for that particular usage. - Page 59 ® ® AmPlus™ 50 and AmPlus 100 Business Music Amplifiers Service Manual © 1997 Bose Corporation Part Number 194101 Rev. 00...
- Page 60 SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE ® ® Bose Corporation The Mountain Framingham, Massachusetts USA 01701 P/N: 194101 Rev.00 11/97 FOR TECHNICAL ASSISTANCE OR PARTS ORDERS, CALL 1-800-367-4008...