Dolby Laboratories CP650, Руководство по установке

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Dolby
®
Model CP650 Installation Manual Installation
2-3
Bypass Power Supply Fuse
The bypass power supply fuse is accessible by removing the plastic front-panel and
the front subpanel. It is located above the power/bypass switch. The fuse values are:
For 110 VAC Mains
T 200 mA L (time-lag, 200 mA, 20 mm, low breaking capacity, 250 V)
For 220 VAC Mains
T 100 mA L (time-lag, 100 mA, 20 mm, low breaking capacity, 250 V)
Caution: Early CP650s used a 315 mA fuse for all mains voltages. The fuse ratings
above should be used for more reliable overcurrent protection.
Internal Fuse
The switching DC power supply contains a separate internal fuse, not accessible to
the installation engineer or user. Do not remove the power supply cover. The CP650
main fuse will protect most fault conditions. If this fuse blows, the power supply has
certainly failed.
2.3 Mount the CP650
To avoid heat or hum pickup problems, do not mount the Dolby CP650
®
immediately
above or below the power amplifiers. Locate the power amplifiers away from the
CP650 to avoid hum pickup problems. Always leave a 1U space (43 mm, or 1.75
inches) above and below the CP650 to provide adequate ventilation. Install an air
guide or baffle to deflect hot air from equipment below the CP650.
To ensure good ground contact, install a star washer on at least one (and preferably
all) rack-mounting screw(s) per piece of equipment (Figure 2–2). This will also aid in
the prevention of electrical noise problems.
Figure 2–2 Star Washers and Rack-Mounting Screws
Proper shielding and termination of cables and cable assemblies are also very
important. Follow the methods shown in the wiring diagrams.
If you are installing a Dolby Cat. No. 701 Digital Soundtrack Reader, refer to its
installation manual for mounting and alignment.