Integra DTA-9.4 Service Manual page 34

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OPERATION CHECK-6
CAUTION IN THE CASE OF SPEAKER OUTPUT CHECK
The power amplifier circuit of DTA-9.4 is BTL system.
Therefore, in case you check speaker output, should be careful of the following point.
1. Do not connect the minus side OUTPUT terminal, and ground of the unit (Fig-1).
2. Do not connect minus of each OUTPUT terminal. (Fig-2).
3. Cannot check with an oscilloscope between the plus side of an OUTPUT terminal, and Chassis GND. (Fig-3).
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Fig-1
OUTPUT
LEFT
CENTER
RIGHT
Fig-2
OUTPUT
LEFT
CENTER
RIGHT
Fig-3
OUTPUT
LEFT
CENTER
RIGHT
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2 9
8
Oscilloscope
Chassis GND of unit
Q Q
3 6 7 1 3 1 5
Chassis GND of unit
co
.
9 4 2 8
0 5 8 2 9 9 4 2 8
m
DTA-9.4
9 9
9 9