True Manufacturing Company PRECISION 8i operation manual 3 4 5 6 + S + S + S + S + S + S + S +

PRECISION 8i OPERATION MANUAL

must be of the same type. AC mains power cord must be removed to gain access to Fuse Drawer 1 for fuse replacement.

		3					4
							TRUE Systems - Precision 8i
							Sunrise Engineering and Design Inc.
							Tucson, Arizona USA
LINK	CONNECT	7	5	3	1	S/N
	ONLY
	PSU-P8i	8	6	4	2	(4-40)	1-8
		DO NOT DISCONNECT			BALANCED OUT
		WITH AC POWER ON

Signal Ground Connection: LINK 3 connects signal ground to earth ground. Signal ground is isolated from earth ground if the LINK jumper is removed. This jumper will normally be installed. See “Troubleshooting”section for usage tips.

Output Cable Connection: For ease of connection, we’ve provided two styles of

balanced output connector: 8-channel DB25 and individual TRS 4 . Both output types are electrically equivalent and may be used simultaneously to connect to Line Inputs on mixing consoles, recorders, etc. If both pairs of outputs are used, care should be taken to avoid system ground loops. See “Troubleshooting”section for tips on avoiding hum caused by grounding problems.

The DB25 and TRS output connectors are not electronically isolated. Therefore, if you chose to connect either one of the output connectors to an unbalanced input, the other connector will automatically be unbalanced. When connecting an output of the PRECISION 8i to an unbalanced input, you must connect the negative signal pin (pin 3 of the XLR or “ring”of the TRS) to the shield. Failure to do this will result in audible distortion.

The wiring configuration used for the output connectors on the PRECISION 8i is:

For TRS:

∙ Tip is positive (+) ∙ Ring is negative (-) ∙ Sleeve is shield

For DB25:

This output connector is wired according to the Tascam® 8-channel analog wiring configuration. DO NOT USE TDIF CABLES.

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S - + S - + S - + S - + S - + S - + S - + S - +

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