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XR-e2461y1, XR-P640M,
XR-P34()M
)(R-P7 Q,
XR-P64O, XR-P34O
!
Rear Amp Side (REAR, PWR, PRTEC ASSY)
Step
Measurement
Item
Remarks
1
Center amp side
Short both sides of C7523 and C7524 orr the Front Amp side.
Do not operate the Front Amp side.
2
Insert a resistor (0.220. 2W or more) in series in the conDector
CN7102 +B2 (or
82) line (terminal No. 5 or 6). (Refer to Fig. 2-4.)
For measuring voltage at both sides of
resistor
3
Short both sides of C7124 on the Surround Amo side.
Do not operate the Surround Amp.
4
Turn the power ON, wait 6 seconds, and then measurc the resistance
voltage in Step 2.
Idle current: | = Y10.22 (O)
5
Surrould amp side
a Same as Steps I and 2 above.
Short both sides of C7123 on Surround Amo side.
a
Do not opemte Surround Amp.
6
Turn the power ON under the conditions in Steps I and 2, and alter 6
seconds measure the resistance voltage in Step 2.
7
If the measured idle current is greater than 50mA, perform the follow-
ing procedure.
8
C€nter amp side
Short b€tween the Point C pattem in Fig. 2 5 using solder.
Connecl R7l17 to R7115 in a parallel cir -
cult.
9
Surround amp side
Short between the Point D pattern in Fig.2
5 using solder.
Connect R7118 to R7116 in a parallel cir-
cuit.
10
AJter performing Steps 8 and 9, remeasure the idle current and con-
firm that it is below 50m-{.
NOTE:
If the idle current is below 3mA, support a resistor (15kQ ) between the emitter and the Q7101 (Center-ch) and Q7102 (Surround-
ch) base. and confirm that the idle current is within 3-50mA.
3. Adjusting the Operating Temperature Setting
This adjustment is necessary when IC7403 (+12V
regulator), Q7301 and Q7302 (temperature sensors), or
VR7701 has been replaced, or when the entire split board
Assy of the Power Amp Module Assy has been replaced.
I
Adjustment-Related Cautions
a Make sure the heat sink has sufficiently cooled (is the
same as room temperature Ta.)
a
Once the power has been turned ON, make
measurements and adjustments as quickly as possible, (If
too much time is taken, the heat sink temperature will
rise, and the measurements will deviate from the Ta
measurement point.)
I
Adiustment
1. Connect a voltmeter between TEMP and TP (or between
IC7702 terminals No.3 and 2). (Refer to Figs. 2 3 and
2 - 6 . )
2. Determine the fan motor operating temperature setting
by means of the following formula. (Tolerance is within
t30mV.)
Formula: (85oC - Ta) x 19 (mV)
Ta: ambient lemp€rature ("C)
3. Adjust VR7701 so that the voltage between TEMP and
TP is the value obtained from the above Iormula.
For examole:
when the room temperature is 25oC,
set value : 185 - 25) x 19 {mV}
= 1140mV {tolerance within t3OmV).
't -22
of the Fan Motor (VR77O1l
FROIT ASSY FOR l OOW
FAN
+12V
R 7 7 0 8
R7749
R 7 7 1 0
R 7 7 1 1
V R 7
Fig. 2-6
Adjustmenl of Opersting Temperatur€ Setting ot Fan
Motor
701
@
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