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AR9LSi Crossover Repair

for systems with PCB CrossoversI recently acquired a pair of AR9LSi and began arefurbishment, including caps.

After removing all the drivers from the cabinets, I

discovered a printed circuit card crossover I have

never seen before in an AR speaker. More

importantly, I determined the capacitors I wanted to

replace are located UNDER the circuit card, glued inplace to the rear of the cabinet. I had to do some

research to determine what to cut and where to

wire the new ones.

This guide details my research used to replace the

capacitors in my AR9LSi. My approach was to

remove a single lead from each of the old capsrather than try to remove the circuit card to remove

the caps. I felt this was less risky and would be less

disruptive of the current configuration. This

documentation helped me work through the

process while avoiding mistakes.

Brian O’Donnell – briodo@gmail.com

Table of Contents

1. Schematic

2. Part locations

3. Cap Lead Cuts

4. New cap wire points

5. Wiring Instructions

6. Finished product

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C1

C2

C3

C4

C5

C6   C7

C8

L11

L12

L23L10

L17

L21

L24

R1

R4

R2

R3

R, C, L identifiers added to ease identification and

Reduce recapping wire errors. L identifiers taken from

PCB markings. BCO Oct 19, 2010

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C1

      C      2

      C      3

C4  C

      5      C      6

C7

C8

L11

L12

L23

L10

L17

L21

L24

R1

R4

R2

R3

Capacitors are mounted below PCB

Cabinet

Bottom

Cabinet

Top

Right

Side

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C1

C8

        C       5

        C        6

        C        2

        C        3

C4

C7

Mirror

reflection

of C5 lead

Mirror

reflection

of C5 lead

Lead

locations

Lead

locations

Lead

locations

Lead

locations

Lead

locations

Lead

locations

Lead

locations

Lead

locations

Cabinet

Bottom

Cabinet

Top

Each cap lead is available by the edge

of the circuit card. See the lead location

pointers on right.

Mirror image above showing leadand a cap. The goal is to separate the cap

from the solder pad by clipping the

cap lead.

Carefully cut lead pulling it away from

solder pad and all other circuitry. You

will have 8 cuts total for the 8 caps.

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C1

      C      2

      C      3

C4  C

      5      C      6

C7

C8

L11

L12

L23

L10

L17

L21

L24

R1

R4

R2

R3

C4

C7C5/C6

C1

C8

C2/C3

Capacitors are mounted below PCB

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External Cap Board Wiring Instructions

• All location references are based on crossovercircuit card view from left side into cabinet, rightside of cabinet is up.

1. C1 to bottom lead L10 and left lead R12. C2/C3 to bottom lead L24 and bottom lead R2

3. C4 to bottom lead L11 and left lead R3

4. C5/C6 to right lead L21 and top lead R45. C7 to left lead L21 and right lead R3

6. C8 to left lead L17 and bottom lead R4

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Finished Product