Integra DTR-7.3, Service Manual

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DTR-7.3
ADJUSTMENT AND CONFIRMATION PROCEDURES 1
Idling current adjustment
Before Idling current adjustment, turn the trimming resistors R6040 to R6046 to counter-clockwise.
Connect the DC voltmeter at the sockets P6080 to P6086.
After turn POWER to ON, adjust the trimming resistors R6040, R6041 and R6042 so that the reading of
voltmeter becomes 11 mV. (Front and center channels)
Adjust the trimming resistors R6043, R6044, R6045 and R6046 so that the reading of
After adjustment, attach the top cover.
voltmeter becomes 4.5 mV. (Surround and surround back channels)
Confirm the voltage of points above after about five minutes.
Front and center channels
When less than 16.5 mV, readjust the resistors above so that the voltage becomes 16.5 mV.
When 16.5 mV to 18.5 mV, you are not necessary to adjust.
When more than 18.5 mV, readjust the resistors above so that the voltage becomes 18.5 mV.
Surround and surround back channels
When less than 6.0 mV, readjust the resistors above so that the voltage becomes 6.0 mV.
When 6.0 mV to 8.0 mV, you are not necessary to adjust.
When more than 6.0 mV, readjust the resistors above so that the voltage becomes 8.0 mV.
Note: No load and No signal
Confirmation of protection circuit
1. Confirmation of operation of speaker relay
Confirm that the speaker relays turn ON approximate. 5 seconds after the power switch is turned ON.
Confirm that the speaker relays turn OFF immediately after the power switch is turned OFF.
2. Confirmation of DC detection circuit
Press and hold down CD button, then press STANDBY/ON and DISPLAY buttons to set the unit to
"Test-1" mode.
After "Test-1" on the FL tube light on, press VIDEO 1 button to set the unit to "Test-1-00".
Apply DC 1.5 to 3.5V to the MULTI-CH INPUT terminal with no load.
Confirm that the speaker relay turns OFF.
Apply DC -1.5 to -3.5 V to the MULTI-CH INPUT terminal with no load.
Confirm that the speaker relay turns OFF.
Caution: Don't apply DC voltage more than 1 sec..
P6010
P6011
P6012
P6015 P6013
P5004A P5004B P5004C P5004D
P5003C P5003B
P5003A
NCAF-7706
R6040
P6000
ID+
ID-
P6080
R6041
P6001
ID+
ID-
P6081
R6042
P6002
ID+
ID-
P6082
R6043
P6003
BIAS
ID+
ID-
P6083
P6004
BIAS
ID+
ID-
P6084
BIAS
ID+
ID-
P6085
P6016
BIAS ID+
ID-
P6086
P6006
P6005
P6205
R6046
R6044 R6045
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