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ADJUSTMENT AND CONFIRMATION PROCEDURES 2
3. Confirmation of Current detection circuit
Set the unit to "TEST-1-00".
Connect the differentiating circuit and apply the 200Hz square signal to MULTI CHANNEL INPUT terminal.
of each channel.
Adjust the attenuator or Volume so that the output level becomes 35V p-p.
Confirm that the speaker relay does not turn OFF when a 3.0 ohm load is connected.
Confirm that the speaker relay turns OFF when a 1.5 ohm load is connected.
CR
OSCILLATOR
200Hz
SQUARE
INPUT
3.3k
GND
TE
L 13942296513
4. Confirmation of fan
Set the unit to "TEST-1-00".
Apply the 1kHz -30dBV signal to the left channel of MULTI-CH terminal with no load.
Confirm that the fan rotates slow speed after few seconds.
Confirm the operation above at all channels.
Connect the 1.2 kohm/1W resistor between terminals COM and TH-1 of P6401 with no input signal.
Confirm that the fan rotates slow speed after few seconds.
Next apply the 1kHz -30dBV signal to the left channel of MULTI-CH terminal with no load.
Confirm that the fan rotates high speed after few seconds.
Connect the 1.2 kohm/1W resistors between terminals COM-TH-1 and COM-TH-2 of P6401 respectively with no input signal.
Confirm that the fan rotates high speed after few seconds.
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DIFFEREN-
ATTENU-
TIATING
ATOR
CIRCUIT
0.1 F
1SS133x6
10k
Differentiating Circuit
NCETC-7696
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http://www.xiaoyu163.com
2 9
8
MULTI
CHANNEL
INPUT
UNIT
3.3k
OUT-
PUT
0.01 F
Q Q
3
6 7
1 3
1 5
JL9503A
COM
TH2
TH1
co
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9 4
2 8
SPEAKER
TERMINAL
OSCILLO-
SCOPE
35Vp-p
0 5
8
2 9
9 4
m
DTR-7.3
9 9
2 8
9 9
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