Dolby Laboratories CP650 Installation Manual download pdf (Page 124)

Dolby

Model CP650 Installation Manual Maintenance and Troubleshooting

9-2

9.2.1 Replacing the Cat. No. 701 Digital Soundhead LED Assembly

In normal operation, the LED assembly used in the Cat. No. 701 Digital Soundhead

will exhibit gradually reduced light output over its life. If it becomes necessary to

replace the LED, follow the procedure outlined below. The LED assembly is

Dolby Part No. 83308.

Installation

1. Turn off power to the Cat. No. 701 soundhead.

2. Remove the two screws that mount the LED assembly to the arm.

3. Carefully pull the LED assembly off the pivot pin.

Hex size 2.5 mm

Socket

Figure 9–2 LED Assembly Mounting Screws

4. Carefully turn over the assembly and loosen the two screw terminals, and remove

the wires. Note the wire colors and terminal locations.

Black

Red

Remove wires

Figure 9–3 LED Assembly Wiring

5. Attach the wires to the replacement LED assembly using the same wire locations

as in the original LED assembly. The wires may require restripping since they

have been compressed previously, and could be too weak. Inspect the wires

carefully before attaching them to the terminals.

6. Remount the LED assembly onto the pivot pin. Initial adjustment can be made by

tightening the screws slightly with a parallel gap between the rear of the LED

assembly and the facing edge of the arm. Using a sheet of paper will usually

provide the proper clearance.

.07–.10 mm (.003–.004")

Paper or gauge

Gap

Figure 9–4 LED Assembly Initial Gap Setting

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 183 184

No comments

Dolby Laboratories CP650 Installation Manual Page 124