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PRECISION 8i
OPERATION MANUAL
10
must be of the same type. AC mains power cord must be removed to gain access to
Fuse Drawer 1 for fuse replacement.
BALANCED OUT
1
2
3
4
5
6
7
8
1-8
(4-40)
3
4
LINK
CONNECT
ONLY
PSU-P8i
DO NOT DISCONNECT
WITH AC POWER ON
S/N
Sunrise Engineering and Design Inc.
TRUE Systems - Precision 8i
Tucson, Arizona USA
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.
1
13
14
25
+
-
S
+
-
S
+
-
S
+
-
S
+
-
S
+
-
S
+
-
S
+
-
S
8
7
6
5
4
3
2
1