Integra DTR-7.7 Service Manual page 3

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OPERATION CHECK-1
SPEAKER PROTECT-1 (DC VOLTAGE DETECTION)
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange amplifier PC board ass'y (NAAF-8678, NAAF-8682).
[Procedure]
<Note> No load. No input signal.
1. Press and hold down CD button, then press STANDBY/ON button while the unit is Power ON.
" Test - _ " is displayed only for 5 seconds.
2. Press VIDEO 3 button, while the characters of " Test - _ " are displayed.
The unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE
Check whether the operation starts and continues automatically as follows.
TE
L 13942296513
If all channels are OK, the characters of " Test - 4 - 35 " are finally displayed.
4. Press STANDBY/ON button.
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T e s t - _
Blinks
T e s t - 4 - 0 0
+
button until the characters of " Test-4-21 " are displayed.
T e s t - 4 - 2 1
T e s t - 4 - 2 1
P r o te c t OK
T e s t - 4 - 2 2
P r o te c t OK
T e s t - 4 - 2 3
P r o te c t OK
T e s t - 4 - 2 4
P r o te c t OK
T e s t - 4 - 3 5
C l e a r
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2 9
8
Front L ch
Check Q Q
T es t - 4-25
3 6 7 1 3 1 5
Prot ec t OK
Front R ch
Check
T es t - 4-26
Prot ec t OK
Center ch
Check
T es t - 4-27
Prot ec t OK
Surround L ch
Check
Prot ec t
Turn off
co
.
9 4 2 8
0 5 8 2 9 9 4 2 8
Surround R ch
Check
Surround Back L ch
Check
Surround Back R ch
Check
m
DTR-7.7
9 9
9 9