Bose Network Card 802c User Guide page

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.

Service Manual

Part Number 129292 REV 03

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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 unpro-

tected 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

Input Connections:

(per channel)

One (1) balanced female XLR connector

One (1) unbalanced 1/4" phone jack

Output Connections:

(per channel)

Two (2) 1/4" phone jacks per channel

(outputs used depend upon mode selected)

Input Impedance:

Balanced input, 4kΩ

Unbalanced input, 42kΩ

Electronic Crossover

Frequency:

180Hz (bi-amplified mode only)

Maximum Output Level:

Total Harmonic Distortion:

4 Volts (+12dB into 600Ω, 50Hz-16kHz)

Less than .02% at 1 Volt (0dB)

Less than .2% at 8 Volts (18dB)

Output Noise:

Less than 20uV (-9dBV) A-weighted

Power Requirements:

120 Vac, 50-60Hz, 3.5 Watts

220 Vac, 50-60Hz, (European)

100 Vac, 50-60Hz, (Japan)

Dimensions:

Weight:

1 3/4"H x 10" W x 5" D

(4.4 x 25.4 x 12.7 cm)

1.97 lbs (.895 kg)

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TECHNICAL DESCRIPTION

The 802^®C System Controller is a sophisticated signal processing device which combines the

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 conjunc-

tion with the unit's output jacks. In addition to signal routing based on equalization require-

ments, 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^®802E active equalizer, and fits into one

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 elimi-

nate 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.

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DISASSEMBLY/ASSEMBLY PROCEDURES

Note: Refer to the Figures (2 and 3) for the

following procedures.

4.2 Perform procedure 2.

5. Main PCB Removal

5.1 Perform procedure 1.

1. Top Cover Removal

1.1 Remove the four screws (two located

at the rear of the unit and one located on

each side of the unit) that secure the top

cover to the chassis.

5.2 Remove the 6 knurled nuts securing

the input and output jacks to the chassis.

5.3 Remove the 5 screws that secure the

main PCB to the chassis.

1.2 Lift the rear of the top cover slightly

and slide it forward until the front of the top

cover is clear of the switches.

5.4 On the rear of the unit, at the XLR

jacks there is a small hole with a locking

screw inside (see Figure 1). Insert a small

flathead screwdriver into the hole and

rotate the locking screw 1/8 turn counter-

clockwise to release the locking tab.

2. Top Cover Replacement

2.1 Align the front of the top cover with the

switches and LED's and slide the cover into

place.

5.5 Lift the front of the PCB up slightly.

Gently pull the PCB out while pushing on

the center of the XLR jacks.

2.2 Secure the top cover into place.

3. 302EQ ("piggy-back") PCB Removal

6. Main PCB Replacement

Note: The original 802C has two PCB's.

The following procedure will discuss the

removal of the "piggy-back" PCB.

6.1 Carefully slide the PCB into the chas-

sis while aligning the XLR jacks into their

housing.

Note: The "piggy-back" PCB does not

need to be removed when removing the

main PCB.

6.2 Lock the XLR jacks into place by

inserting a small screwdriver into the small

hole in the XLR jack and rotate the screw

clockwise 1/8 turn.

3.1 Perform procedure 1.

3.2 Locate the four plastic stand-offs (three

are located in the corners of the PCB and

one is located between C125 and C225).

6.3 Replace the 5 screws that hold the

PCB into place in the chassis.

6.4 Perform procedure 2.

3.3 With small needle-nose pliers, squeeze

the retaining tab of each stand-off while

gently lifting up on the PCB to release the

lock. Grasp the PCB at the middle of each

side and lift the PCB off of the connectors.

4. 302EQ ("piggy-back") PCB Replace-

ment

4.1 Replace the "piggy-back" PCB (on the

original 802C controller) by placing the

board over the connectors and pushing the

board down onto the stand-offs.

Figure 1. Locking Tab Screw Location

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