BOSE 1800V S5 Schematic
Contents
Safety Information............................................................................................................................ 2
Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 3
Supplement Description.................................................................................................................. 3
Test Procedures ............................................................................................................................... 4
Part List Notes.................................................................................................................................. 5
Electrical Part List......................................................................................................................... 6-7
PCB Layout....................................................................................................................................... 8
Figure 1. PCB SMD Bottom View .................................................................................................... 8
Figure 2. PCB Component Top View................................................................................................ 8
Figure 3. Model 8 and Model 25/32 Schematic Diagram ................................................................. 9
CAUTION: THE EQ PCB ASSEMBLIES CONTAIN NO USER-SERVICEABLE PARTS. TO
PREVENT WARRANTY INFRACTIONS, REFER SERVICING TO WARRANTY SERVICE
STATIONS OR FACTORY SERVICE.
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF
BOSE
®
CORPORATION WHICH IS BEING FURNISHED ONLY FOR
THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT
BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE
BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED
FOR ANY OTHER PURPOSE.
1
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. Use the following checks to perform these measurements:
A. Leakage Current Hot Check-With the unit completely reassembled, plug
the AC line cord directly into a 120V AC outlet. (Do not use an isolation
transformer during this test.) Use a leakage current tester or a metering
system that complies with American National Standards Institute (ANSI)
C101.1 “Leakage Current for Appliances” and Underwriters Laboratories
(UL) 1492 (71). With the unit AC switch first in the ON position, then in the
OFF position, measure from a known earth ground (metal water pipe,
conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket,
metal cabinet, screwheads, metallic overlays, control shafts, etc.), especially
any exposed metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 milliamp. Reverse the unit power
cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN
THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZ ARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO
THE CUSTOMER.
B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and
connect a jumper wire between the two prongs of the plug. (2) Turn on the
power switch of the unit. (3) Measure the resistance with an ohmmeter be-
tween the jumpered AC plug and each exposed metallic cabinet part on the
unit. When the exposed metallic part has a return path to the chassis, the
reading should be between 1 and 5.2 Megohms. When there is no return path
to the chassis, the reading must be “infinite”. If it is not within the limits specified,
there is the possibility of a shock hazard, and the unit must be repaired and re checked before it is returned to the customer.
2
ELECTROSTATIC DISCHARGE SENSITIVE (ESDS)
DEVICE HANDLING
This unit contains ESDS devices. We recommend the following precautions when repairing,
replacing, or transporting ESDS devices:
• Perform work at an electrically grounded work station.
• Wear wrist straps that connect to the station or heel straps that connect to conductive floor
mats.
• Avoid touching the leads or contacts of ESDS devices or PC boards even if properly
grounded. Handle boards by the edges only.
• Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap
or plastic trays.
SUPPLEMENT DESCRIPTION
This supplement should be used along with the 1800V EQ PCB service manual part number
181812-S2. The disassembly/assembly procedures, and packing part list should be used along
with the information in this manual. The test procedures were included in this manual for your
convenience.
3
TEST PROCEDURES
1. Model 8 EQ PCB Response Test
1.1 Apply a signal of 1kHz at an input level
of 100mVrms.
1.2 Adjust the amplifier volume controls to
maximum. No EQ card installed.
1.3 Reference a dB meter to the output of
the amplifier.
1.4 Shut off the amplifier and insert the EQ
card according to the assembly procedure.
1.5 Turn on the amplifier and measure the
gain. There should be a -3.5dB change in
gain at the output.
1.6 Reference a dB meter and measure
the response of the EQ card according to
the Model 8 Full Range Response chart
below.
Model 8 Full Range Response Chart Model 25/32 Full Range Response Chart
Frequency Output Tolerence
95Hz +11.3dB ±1.5dB
250Hz +4.5dB ±1.5dB
1kHz 0dB
Reference
2kHz +3.0dB ±1.5dB
4kHz +7.0dB ±1.5dB
8kHz +10.5dB ±1.5dB
12.5kHz +11.75dB ±2.5dB
-
2. Model 25/32 EQ PCB Response Test
2.1 Apply a signal of 1kHz at an input level
of 100mVrms.
2.2 Adjust the amplifier volume controls to
maximum. No EQ card installed.
2.3 Reference a dB meter to the output of
the amplifier.
2.4 Shut off the amplifier and insert the EQ
card according to the assembly procedure.
2.5 Turn on the amplifier and measure the
gain. There should be a -4.8dB change in
gain at the output.
2.6 Reference a dB meter and measure
the response of the EQ card according to
the Model 25/32 Full Range Response
chart below.
Frequency Output Tolerence
95Hz +12.3dB ±1.5dB
250Hz +4.4dB ±1.5dB
1kHz 0dB
Reference
2kHz +1.7dB ±1.5dB
4kHz +7.6dB ±1.5dB
8kHz +12.0dB ±1.5dB
12.5kHz +15.0dB ±2.5dB
-
1.7 Shut off the amplifier. Open the input
panel and switch the high frequency/full
range switch to the high frequency position.
1.8 Measure the response according to the
Model 25/32 High Frequency Response
chart below.
Model 8 High Freq. Response Chart
Frequency Output Tolerence
95Hz +11.3dB ±1.5dB
250Hz +4.5dB ±1.5dB
1kHz 0dB
Reference
2kHz +3.0dB ±1.5dB
4kHz +7.0dB ±1.5dB
8kHz +10.5dB ±1.5dB
12.5kHz +11.75dB ±2.5dB
-
2.7 Shut off the amplifier. Open the input
panel and switch the high frequency/full
range switch to the high frequency position.
2.8 Measure the response according to the
Model 25/32 High Frequency Response
chart below.
Model 25/32 High Freq. Response Chart
Frequency Output Tolerence
95Hz +12.3dB ±1.5dB
250Hz +4.4dB ±1.5dB
1kHz 0dB
Reference
2kHz +1.7dB ±1.5dB
4kHz +7.6dB ±1.5dB
8kHz +12.0dB ±1.5dB
12.5kHz +15.0dB ±2.5dB
4
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