Bose 1801- Manuals

Page 2 - Contents

1 PROPRIETARY INFORMATION THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OFBOSE ® CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCTBY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PUR...

Page 3 - SPECIFICATIONS

2 SPECIFICATIONS M e c h a n i c a lDimensions: 1801 1800 7 3/16" H x 18" W x 18 1/2" D (Including Knobs)81/4"H x 19"W x 15"D (not including handles) Weight: 1801 1800 82 lbs95 lbs (shipping)80 lbs91 lbs (shipping) Power RequirementsVoltage: 105-125 AC USA, 210-250 AC EUR Fre...

Page 4 - SAFETY INFORMATION

3 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 t...

Page 5 - DEVICE HANDLING; General Description

4 ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING CAUTION: THE BOSE ® 1801/1800 POWER AMPLIFIERS CONTAIN NO USER-SERVICE- ABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICE TO WAR-RANTY SERVICE STATIONS OR FACTORY SERVICE. This unit contains ESDS devices. We recommend the following ...

Page 6 - DISASSEMBLY/ASSEMBLY PROCEDURES

5 DISASSEMBLY/ASSEMBLY PROCEDURES 1801 Power Amplifier Note: Refer to Figure 1 for the followingprocedures. 1. Top Cover Removal 1.1 Remove the two screws that securethe top cover at the rear of the unit. Loosenthe two screws located on each side of theunit towards the front. 1.2 Slide the top cover...

Page 10 - TEST PROCEDURES

9 TEST PROCEDURES 1. Bias Adjustment Setup and Procedure 1.1 Locate the -85V negative terminalfound on the capacitor (C4). See Figure 1for the location of C4. Note: The 1801 and very early 1800's hadtwo lugs on the caps. One with two or threewires and one single wire. The later pro-duction 1800 had ...

Page 14 - PART LIST NOTES

13 PART LIST NOTES 1. This part is not normally available from Customer Service. Approval from the Field ServiceManager is required before ordering. 2. The reference designators in bold are located on the LED PCB. 3. This part is not located on the PCB'S. 4. The reference designators marked with a ‡...

Page 15 - PART LIST

14 PART LIST I t e m N u m b e r D e s c r i p t i o n P a r t N u m b e r N o t e A1 Preload Network 102666 6 RT-1, RT-2 Thermal Cut-Out 102440 6 ¥ RCA Jack 102784 6, 9 Q10-23 Screw, 6/32 x 1/2 Stainless Steel 106348 6 Q10-23 Washer 103032 6 Q10-23 Plastic Insulator 102901 6 Q10-23 Nut, Brass, 6/32...

Page 20 - Figure 10. LED PCB Layout

Page 21 - Figure 11. LED PCB Schematic Diagram

Page 22 - Figure 12. Amplifier Schematic Diagram

21 Notes: 1. See Bias Adjustment Procedure. 2. U1 input (pin 2) virtual ground, output test point 8 (pin 6) 275mV . 3. Early production units replace R28 with capacitor C15 (0.1uF) found in either side of the pc board. 4. All resistors are 1/2 watt 5% unless otherwise specified. 5. All capacitor in ...

Page 23 - Figure 13. Amplifier PCB Layout

Page 24 - TROUBLESHOOTING GUIDE; S Y M P T O M

23 TROUBLESHOOTING GUIDE S Y M P T O M P O S S I B L E C A U S E 1. DC Offset: ≤ 2v Defective U1Defective Q1 ≥ 2v Defective U1Defective CR1, 2, 6, 15Open ground at the RCA input jack Test point "A" polaritythe same as DC offset(see Figure 11) Defective Q1-8, Q24Defective CR16, 17 Test point ...

Page 25 - VOLTAGE CONVERSION INSTRUCTIONS

24 VOLTAGE CONVERSION INSTRUCTIONS 1. Perform Top Cover removal procedures for the model amplifier your going to convert. 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 thethermal cutoff...

Page 26 - SERVICE BULLETIN

25 Subject: Interchangeability of repaired amplifier PCB. Torroidal Power Transformer. 1800 Amplifier used with a TC-18 Transit Case. SERVICE BULLETIN Date: 09/19/1977 Remarks: The 1801 power amplifier board ( part # 102735 ) will no longer be shipped as a standardrepair part. Instead, a universal r...

Page 31 - Power Amplifiers; Service Manual