Bose 802c User Manual
802C System Controller
Original and SMD Version
®
®
Units with serial numbers beginning with 100000 are the original 802C's.
Units with serial numbers beginning with 200000 are the new SMD 802C's.
©
1997 Bose Corporation
Service Manual
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Part Number 129292 REV 03
Contents
Safety Information............................................................................................................................ 3
Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 4
Specifications................................................................................................................................... 5
Technical Description ...................................................................................................................... 6
Disassembly/Assembly Procedures .............................................................................................. 7
Figure 1. Locking Tab Screw Location ............................................................................................. 7
Figure 2. Original 802C PCB Exploded View................................................................................... 8
Figure 3. SMD 802C PCB Exploded View ....................................................................................... 8
Test Procedures .......................................................................................................................... 9-10
Part List Notes................................................................................................................................ 11
Main Part List.................................................................................................................................. 12
Figure 4. Main Parts Exploded View .............................................................................................. 13
Electrical Part List..................................................................................................................... 14-17
Voltage Conversion Instructions .................................................................................................. 18
Figure 5. Voltage Conversion Diagram .......................................................................................... 18
Figure 6. Top Cover Connection Diagram...................................................................................... 19
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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.
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.
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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.
CAUTION: THE 802®C SYSTEM CONTROLLER CONTAINS NO USER-SERVICEABLE
PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICING TO WARRANTY
SERVICE STATIONS OR FACTORY SERVICE.
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SPECIFICATIONS
O
Input Connections:
(per channel)
Output Connections:
(per channel)
Input Impedance: Balanced input, 4kΩ
Electronic Crossover
Frequency: 180Hz (bi-amplified mode only)
Maximum Output Level: 4 Volts (+12dB into 600Ω, 50Hz-16kHz)
Total Harmonic Distortion: Less than .02% at 1 Volt (0dB)
Output Noise: Less than 20uV (-9dBV) A-weighted
ne (1) balanced female XLR connector
One (1) unbalanced 1/4" phone jack
Two (2) 1/4" phone jacks per channel
(outputs used depend upon mode selected)
Unbalanced input, 42kΩ
Less than .2% at 8 Volts (18dB)
Power Requirements: 120 Vac, 50-60Hz, 3.5 Watts
Dimensions: 1 3/4"H x 10" W x 5" D
Weight: 1.97 lbs (.895 kg)
220 Vac, 50-60Hz, (European)
100 Vac, 50-60Hz, (Japan)
(4.4 x 25.4 x 12.7 cm)
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TECHNICAL DESCRIPTION
®
The 802
functions of three equalizers, an automatic switching circuit, and an electronic crossover. The
802C system controller automatically selects the proper crossover function and equalization
curve for a given system application through use of a switching network operating in conjunction with the unit's output jacks. In addition to signal routing based on equalization requirements, the switching network indicates mode of operation on its front panel. The front panel
also includes high-cut and low-cut switches which decrease line output by 4dB at 55Hz and by
10dB at 16kHz. Sharp subsonic and ultrasonic band-limiting filters reduce power waste, stage
noise, high-frequency instability, and interference. The 802C system controller retains the
compact dimensions of its predecessor, the Bose
space of a standard 19" equipment rack with the optional RMK-8 Rack Mount Kit.
In an on-going process of manufacturing updates, as technology permits, Bose Corporation
has begun using SMD (surface mount devices) components on its 802C controller. The new
SMD components are such a space saving feature that this new version permits us to eliminate the "piggy-back" PCB and place all electronics on one single printed circuit board. This
manual will identify the different procedures, PCB layouts, and components where necessary.
There is no difference in the operation or function between the original 802C and the
802C SMD units.
C System Controller is a sophisticated signal processing device which combines the
®
802E active equalizer, and fits into one
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