Bose 1801 Service Manual
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Bose 1801 Service Manual

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SUPPLEMENT
Q4, part number 102428 and Q5, part number 102429 are no longer available with the lead length
needed for soldering to the PCB. Use the part numbers listed below when ordering these transis-
tors. Make a note in your Model 1801/1800 power amplifier service manual, part number 192527.
Reference
Designator
Q4
Q5
NOTE: The part numbers listed are kits. They include the following parts:
1. Q4 kit: 1 102428 transistor
3 264371 extension pins
1 192527-S1 supplement.
2. Q5 kit: 1 102429 transistor
3 264371 extension pins
1 192527-S1 supplement.
©
2001 Bose Corporation
10/2001
®
Bose
Model 1801/1800

Power Amplifier

Description
SIM, 2N2219
SIM, 2N5415
Part
Note
Number
102428-1K
1
102429-1K
2
Supplement
Part Number 192527-S1

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  • Page 1: Power Amplifier

    Q4, part number 102428 and Q5, part number 102429 are no longer available with the lead length needed for soldering to the PCB. Use the part numbers listed below when ordering these transis- tors. Make a note in your Model 1801/1800 power amplifier service manual, part number 192527. Reference...

  • Page 2: Table Of Contents

    Figure 3. 1800 Front Panel ......................11 Figure 4. 1800 Rear View of Front Panel ..................11 Figure 5. 1801 Rear View of Front Panel ..................11 Figure 6. 1800 Rear Panel ......................12 Figure 7. 1801 Rear Panel ......................12 Part List Notes ..........................

  • Page 3: Specifications

    SPECIFICATIONS Mechanical Dimensions: 1801 7 3/16" H x 18" W x 18 1/2" D (Including Knobs) 1800 81/4"H x 19"W x 15"D (not including handles) Weight: 1801 82 lbs 95 lbs (shipping) 1800 80 lbs 91 lbs (shipping) Power Requirements...

  • Page 4: 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 5: Electrostatic Discharge Sensitive (Esds) Device Handling

    They use computer grade capacitors throughout the power supply, along with a 2.0kW power transformer and 1300 sq. inches of heat sink area. They also have a power monitor display using a light emitting diode array and in the case of the 1801 signal meters as well.

  • Page 6: Disassembly/Assembly Procedures

    DISASSEMBLY/ASSEMBLY PROCEDURES 1801 Power Amplifier Note: Refer to Figure 1 for the following 4.3 Connect the wire harness, thermal procedures. cutout wires, and the input cable to the PCB. 1. Top Cover Removal 5. Front Panel Removal 1.1 Remove the two screws that secure 5.1 Perform procedure 1.
  • Page 7 DISASSEMBLY/ASSEMBLY PROCEDURES 1801 Power Amplifier Note: Refer to Figure 5 for the following 12.2 Place the meter lamp housing over procedures. the meters and secure it to the front assem- 9. LED PCB Removal bly. 9.1 Perform procedure 7. 12.3 Perform procedure 8.
  • Page 8 DISASSEMBLY/ASSEMBLY PROCEDURES 1800 Power Amplifier Note: Refer to Figure 1 for the following 5. Front Panel Removal procedures. 5.1 Perform procedure 1. 1. Top Cover Removal 5.2 Locate and remove the eight screws holding the front panel to the chassis. Four 1.1 Remove the four screws that secure of the screws are located just inside the the top cover to the unit.
  • Page 9 DISASSEMBLY/ASSEMBLY PROCEDURES 1800 Power Amplifier Note: Refer to Figure 6 for the following Note: Refer to Figures 3, and 4 for the following procedures. procedures. 9. Gain Control Removal 13. Rear Panel Removal 9.1 Perform procedure 5. 13.1 Perform procedure 1. 9.2 Remove the gain control knobs.

  • Page 10: Test Procedures

    C4. 4.2 Apply a 1.75Vrms, 1kHz signal to the Note: The 1801 and very early 1800's had input. two lugs on the caps. One with two or three wires and one single wire. The later pro- 4.3 Turn the gain controls up to the point...

  • Page 11: Figure 1. 1801 Component Location

    Figure 1. 1801 Component Location Figure 2. 1801 Side View...

  • Page 12: Figure 3. 1800 Front Panel

    Figure 3. 1800 Front Panel Figure 4. 1800 Rear View of Front Panel Figure 5. 1801 Rear View of Front Panel...

  • Page 13: Figure 6. 1800 Rear Panel

    Figure 6. 1800 Rear Panel Figure 7. 1801 Rear Panel...

  • Page 14: Part List Notes

    6. This part is located on the amplifier PCB. 7. This part is used on the 1801 Power Amplifier. 8. This part is used on the 1800 Power Amplifier. 9. Items marked with a ¥ symbol are not shown in the exploded views.

  • Page 15: Part List

    Audio Cable 102838 Toggle Switch, ON/OFF 103291 Switch, ON/OFF 102740 Input Switch 102576 Speaker Switch 103400 J3, 4 (J5, 6 1801 ) Phone Jack 102704 R5, 6 Gain Control, 100kΩ 102406 R5, 6 Gain Control, 100kΩ 103260 Indicator Lens, White...
  • Page 16 PART LIST Main Part List (per figures 1-7) Item Description Part Note Number Number Rubber Foot 121929 Fuse (110v)15A, 1 1/4 x 1/4Slo-Blo 103608 Fuse (220v) 8A, 5 x 20mm 108190-800 Fuse (220v) 7A, 1 1/4 x 1/4Slo-Blo 103609 ¥ Fuse Cap for 1 1/4 x 1/4 109484 ¥...
  • Page 17 PART LIST Resistors Reference Description Part Note Designator Number R1-4 1MΩ, 1/2W, 10% 102944-105 8.2kΩ, 1/2W, 10% 104064-822 3kΩ, 2W, 10% 108676-302 R9, 17 6.19Ω, 1/4W, 1% 104095-6191 1.5kΩ, 1/4W, 1% 104095-1501 R12, 51, 53 340Ω, 1/4W, 1% 104095-3400 100Ω, Bias Pot 102832 R18, 20, 48 23.7kΩ, 1/4W, 1%...

  • Page 18: Part List

    PART LIST Capacitors Reference Description Part Note Designator Number C1‡, 2‡ 1uF, Mylar, 50v, 10% 102751 C1, 14, 15 .1uF, Electrolytic, 100v, 10%, NP 102403 C 1 , 1 0 1 100uF Electrolytic, 3v 102836 C2, 3 30uF Electrolytic, 100v 102405 C3, 4 14,000uF, Electrolytic, 100v...

  • Page 19: Figure 9. 1801/1800 Block Diagram

    Bridge Rectifier Turn On Relay Figure 9. 1801/1800 Block Diagram...

  • Page 20: Figure 10. Led Pcb Layout

    Figure 10. LED PCB Layout...

  • Page 21: Figure 11. Led Pcb Schematic Diagram

    Figure 11. LED PCB Schematic Diagram...

  • Page 22: Figure 12. Amplifier Schematic Diagram

    Figure 12. Amplifier Schematic Diagram...

  • Page 23: Figure 13. Amplifier Pcb Layout

    Figure 13. Amplifier PCB Layout...

  • Page 24: Troubleshooting Guide

    TROUBLESHOOTING GUIDE S Y M P T O M POSSIBLE CAUSE 1. DC Offset: ≤2v Defective U1 Defective Q1 ≥2v Test point "A" polarity Defective U1 Defective CR1, 2, 6, 15 the same as DC offset Open ground at the RCA (see Figure 11) input jack Defective Q1-8, Q24...

  • Page 25: Voltage Conversion Instructions

    2. Refer to the figures below for the voltage conversion being performed. 3. On the 1801 when converting to 110 volts remove the in-line resistor found wired to the thermal cutoff indicator. Connect the wire directly. For 220 voltage conversion connect a 56k ohm 1/2 Watt resistor directly to the thermal cutoff indicator terminal.

  • Page 26: Service Bulletin

    1800 Amplifier used with a TC-18 Transit Case. Remarks: The 1801 power amplifier board ( part # 102735 ) will no longer be shipped as a standard repair part. Instead, a universal replacement board ( part # 102735-1 ) with a special thermo- static clip connection allowing the use of this board in the 1801 and early production 1800 wire harness assembly.
  • Page 27 Bulletin #13A Remarks: We have found that the resistor R3 on the 1801/1800 amplifier PCB's have shown a higher failure rate than normal. Studies reveal that the resistor normally runs at about 150-170°F. The etch layout at R3 is not sufficient to provide adequate heat sink for this component, and the resistor eventually changes value due to the heat.
  • Page 28 SERVICE BULLETIN Subject: Thermal Improvement Date 10/05/1979 Bulletin #17 Remarks: I'm pleased to inform you that we have developed a method for improving the thermal stability of the 1800 amplifier, which may have been a problem to you during the last several months. This problem was caused by a change we were forced to make when RCA discontinued the manufacture of the transistor we had been using as Q3 on the 1800 PCB's.

  • Page 29: Service Bulletin

    1800 amplifier boards currently being produced. The transistors have been change from Bose P/N 102433 (2N5840) to P/N 117579 ( Motorola MJ15011). The new output transis- tors are not compatible with the original 102433 transistors. If you service an 1800 power amplifier or PM-2 mixer, check the serial numbers on the printed circuit board and the P/N on the output transistors to see which output device is being used.
  • Page 31 ® ® Bose Model 1801/1800 Power Amplifiers Service Manual © 1997 Bose Corporation Part Number 192527 REV 01...
  • Page 32 SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE ® ® Bose Corporation The Mountain Framingham Massachusetts USA 01701 P/N 192527 REV. 01 06/97 FOR TECHNICAL ASSISTANCE OR PART ORDERS, CALL 1-800-367-4008...

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