Roland AC-90 Service Notes page 19

Jul. 2007
6. Output-level Confirmation
With a dummy load resistor connected to the output jacks according to the following table, check the signal level at each end of the dummy resistor.
* The values shown are a rough guide. Actual values are subject to volume-production fluctuations. (Approx. +/-1.5 dBu with respect to the values in the table below)
* For the dummy load resistor, use the plug indicated under "Connection plug" in the table below, and connect the resistor between the output-connector signal line and ground.
Output connector
DI OUT TIP
DI OUT RING
SUB WOOFER OUT (MASTER VR: MAX)
LINE OUT (MONO)
LINE OUT L (HOT)
LINE OUT L (COLD)
LINE OUT R (HOT)
LINE OUT R (COLD)
PHONES L
PHONES R
When inspection testing is finished, switch off the power.
When inspection testing is finished, switch off the power.
Dummy load Connection plug
resistor value
680 Ω (1/2 W) STEREO standard
680 Ω (1/2 W) STEREO standard
47 kΩ (1/2 W) MONO standard
47 kΩ (1/2 W) MONO standard
680 Ω (1/2 W) XLR
680 Ω (1/2 W) XLR
680 Ω (1/2 W) XLR
680 Ω (1/2 W) XLR
100 Ω (1/2 W) STEREO standard
100 Ω (1/2 W) STEREO standard
Output level during Output level during
GUITAR input MIC input
-8 dBu -8 dBu
-8 dBu -8 dBu
-11.5 dBu -11.5 dBu
-8 dBu -8.5 dBu
-10.5 dBu -10.5 dBu
-10.5 dBu -10.5 dBu
-10.5 dBu -10.5 dBu
-10.5 dBu -10.5 dBu
-1.0 dBu -1.0 dBu
-1.0 dBu -1.0 dBu
AC-90
19