DTM-5.9
OPERATION CHECK-1
SPEAKER PROTECT-1 (
DC VOLTAGE DETECTION / THERMAL SENSOR)
T e s t - _
T e s t - 1 - 0 0
DC VOLTAGE DETECTION
[When]
1. Exchange power transistors (Q521 - Q524).
2. Exchange amplifier PC board ass'y (NAAF-9610).
<Note>
1. Try again if protect did not work at the first time.
2. Do not connect load or short speaker terminals.
[Procedure]
1. Press and hold down
CD
CD
button, then press
On/
On/Standby
Standby
button while the unit is powered on.
"
Test - _
"
is displayed only for
5
seconds.
2. Press
DVD
DVD
button while the characters of
"
Test - _
"
are displayed.
The unit will be in the state of
"
Test - 1-00
".
3. Set the master volume to maximum
4. Input +1.5 to +3 V DC voltage to CD IN Lch terminal.
And check speaker relays RL591 and RL592 is immediately
Turned off
Turned off
and power indicator blinks.
5. Check Rch according to the same procedure.
6
. Press
On/
On/Standby
Standby
button.
7. Disconnect the AC power cord.
C l e a r
Standby
Blinks
V e r . 1 . 0 3 / 0 8 7 0 8 A
<Ex.>
T : 2 9 C / 8 4 F
THERMAL SENSOR
[When]
Exchange thermal sensor PC board ass'y (NAETC-9621).
[Procedure]
1. Press and hold down
Display
Display
button, then press
On/
On/Standby
Standby
button when the unit is powered on.
The microprocessor version will be displayed for 3 seconds.
button while the version is displayed.
3. Check that the displayed temperature is within
+/-10 C
from the ambient temperature.
Note : The error margin is caused by the rise of the temperature of the heat sink when time passes.
C l e a r
Standby
29 degree celsius
84 degree fahrenheit
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