Hum Problems; Sa10 Circuit Card Descriptions - Film-Tech SA10 Installation Manual

1-6 / Setup / Installation
1.6.1
If you hear undesirable hum from the speakers when you apply power to the SA10 and
other projection room equipment, check the following list for possible causes:
1. Ground loops caused by audio signal wiring, especially to power amplifiers: Be
sure to check the booth monitor wiring.
2. Projector power wiring: All mains wiring should be properly grounded.
3. Room lighting dimmer controls: SCR-type can produce undesirable line noise.
4. Power amplifiers: Disconnect from the SA10 and ground the inputs to determine if
the power amplifiers are causing hum problems.
5. Cinema Processor output: Disconnect the cable from the cinema processor to
determine if it is the source of hum.
1.7 Perform Alignment
Continue the installation procedure beginning with the appropriate manual section, based
on your installed equipment:
•
Section 2
•
Section 3
•
Section 4
•
Section 5
•
Section 6
1.8

SA10 Circuit Card Descriptions

A system block diagram
Three circuit cards form the active circuitry of the SA10. They are located on the left side
(Cat. No.810), the right side (Cat. No. 811), and the front panel (Cat. No. 813).
All circuit cards are interconnected by the backplane circuit board (Cat. No. 812). The
backplane contains EMC filtering along with static protection networks and has no active
circuitry.

Hum Problems

– Alignment with Model CP500 Cinema Processor
– Alignment with Model CP65 Cinema Processor
– Alignment with Model CP200 Cinema Processor
– Alignment with Model CP55 Cinema Processor
– Alignment with Model CP45 Cinema Processor
foldout can be found at the end of this section.