Table of Contents
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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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Table of Contents
Related Manuals for Bose 1800
Summarization of Contents
SPECIFICATIONS
Mechanical Dimensions and Weight
Details physical dimensions and weight for models 1801 and 1800.
Power Requirements
Outlines voltage, frequency, and consumption for the amplifiers.
Amplifier Performance Specifications
Covers output power, distortion, frequency response, and impedance.
SAFETY INFORMATION
Leakage Current Hot Check Procedure
Procedure to measure leakage current to ensure user safety.
Insulation Resistance Test Cold Check
Procedure to test insulation resistance for shock hazard prevention.
ESDS DEVICE HANDLING
General Description of Amplifiers
Overview of the 1801 and 1800 amplifiers' features and technology.
1801 DISASSEMBLY/ASSEMBLY PROCEDURES
Top Cover Removal (1801)
Steps to remove the top cover of the 1801 amplifier for access.
Top Cover Replacement (1801)
Steps for correctly reattaching the top cover to the 1801 amplifier.
Amplifier PCB Removal (1801)
Detailed procedure to remove the amplifier circuit board from the 1801 unit.
Amplifier PCB Replacement (1801)
Steps to install a new or repaired amplifier circuit board into the 1801.
Front Panel Removal (1801)
Instructions for safely removing the front panel assembly of the 1801 amplifier.
Front Panel Replacement (1801)
Procedures for correctly reattaching the front panel assembly to the 1801.
Front Chassis Assembly Removal (1801)
How to remove the front chassis assembly from the 1801 amplifier.
Front Chassis Assembly Replacement (1801)
Steps to reinstall the front chassis assembly onto the 1801.
1801 DISASSEMBLY/ASSEMBLY PROCEDURES CONT.
LED PCB Removal (1801)
Steps to remove the LED PCB assembly from the 1801 amplifier.
LED PCB Replacement (1801)
Procedures for installing a new LED PCB in the 1801 amplifier.
Meter Assembly Removal (1801)
Instructions to remove the meter assembly from the 1801 amplifier.
Meter Assembly Replacement (1801)
Steps for replacing the meter assembly in the 1801 amplifier.
Front Panel Controls Removal (1801)
How to remove front panel controls and switches from the 1801.
Front Panel Controls Replacement (1801)
Procedures for installing new controls and switches on the 1801 front panel.
Lamp Removal (1801)
Steps to remove lamps from the 1801 amplifier's housing.
Lamp Replacement (1801)
Procedures for replacing lamps in the 1801 amplifier.
1800 DISASSEMBLY/ASSEMBLY PROCEDURES
Top Cover Removal (1800)
Steps to remove the top cover of the 1800 amplifier.
Top Cover Replacement (1800)
Procedures for reinstalling the top cover on the 1800 amplifier.
Amplifier PCB Removal (1800)
Instructions for removing the amplifier PCB from the 1800 unit.
Amplifier PCB Replacement (1800)
Steps to install a new amplifier PCB into the 1800 amplifier.
Front Panel Removal (1800)
How to remove the front panel of the 1800 amplifier.
Front Panel Replacement (1800)
Procedures for reattaching the front panel to the 1800 amplifier.
LED PCB Removal (1800)
Steps to remove the LED PCB from the 1800 amplifier's front panel.
LED PCB Replacement (1800)
Procedures for installing a new LED PCB in the 1800 amplifier.
1800 DISASSEMBLY/ASSEMBLY PROCEDURES CONT.
Gain Control Removal (1800)
Steps to remove gain controls from the 1800 amplifier's front panel.
Gain Control Replacement (1800)
Procedures for installing new gain controls on the 1800.
Power Switch Removal (1800)
How to remove the power switch from the 1800 amplifier.
Power Switch Replacement (1800)
Steps for replacing the power switch on the 1800 amplifier.
Rear Panel Removal (1800)
Instructions to remove the rear panel of the 1800 amplifier.
Rear Panel Replacement (1800)
Procedures for reinstalling the rear panel on the 1800 amplifier.
TEST PROCEDURES
Bias Adjustment Setup and Procedure
Detailed steps for setting up and performing bias adjustment on the amplifier.
Frequency Response Procedure
Method to test the amplifier's frequency response characteristics.
DC Offset Procedure
How to measure and check the DC offset at the amplifier's output.
Power Output Procedure
Steps to test the amplifier's maximum power output at specified loads.
Harmonic Distortion Procedure
Procedure for measuring harmonic distortion levels in the amplifier.
Thermal Cutoff Procedure
How to test the amplifier's thermal cutoff protection mechanism.
TROUBLESHOOTING GUIDE
DC Offset Issues
Symptoms and possible causes for incorrect DC offset levels.
High Current Problems
Issues related to excessive current draw and their potential causes.
Oscillation Issues
Problems with signal oscillation, both unloaded and loaded conditions.
Excessive Noise
Causes and symptoms of unwanted noise in the amplifier's output.
Bias Adjustment Failures
Reasons why bias adjustment might fail or be impossible.
Incorrect Frequency Response
Potential causes for deviations from the specified frequency response.
Excessive Distortion
Factors leading to excessive audio distortion in the amplifier.
SERVICE BULLETIN #13
PCB Interchangeability and Transformer
PCB Interchangeability and Transformer update.
SERVICE BULLETIN #13A
Resistor Failure and Modification
Resistor failure analysis and recommended modification.
SERVICE BULLETIN #17
Thermal Improvement
Methods for improving thermal stability and performance.
SERVICE BULLETIN # Pro-81-001
Output Transistor Change
Notification regarding the change in output transistors used.
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