OPERATION CHECK-1
SPEAKER PROTECT-1 (DC VOLTAGE DETECTION)
DTR-7.8
1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.
" Test - _ " is displayed only for 5 seconds.
2. Press GAME/TV button, while the characters of " Test - _ " are displayed.
The unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE + button until the characters of " Test-4-21 " are displayed.
[Procedure]
<Note>
No load. No input.
Te s t - _
Te s t - 4 - 0 0
[When]
1. Exchange power transistors (Q6050 - 6056, Q6060 - 6066, Q6080 - 6086, Q6090 - 6096).
2. Exchange amplifier PC board ass'y (NAAMP-9061, 9062, NACLA-9063 - 9069).
Te s t - 4 - 2 2
Check whether the operation starts and continues automatically as follows.
Te s t - 4 - 2 2
Te s t - 4 - 2 3
Te s t - 4 - 2 6
Te s t - 4 - 2 4
Te s t - 4 - 2 5
P r o t e c t O K
P r o t e c t O K
P r o t e c t O K
P r o t e c t O K
P r o t e c t O K
Te s t - 4 - 3 6
C l e a r
Turn off
Front L ch
Check
If all channels are OK, the characters of " Test - 4 - 36 " are displayed.
4. Press STANDBY/ON button.
Front R ch
Check
Center ch
Check
Surround L ch
Check
Surround R ch
Check
Blinks
Te s t - 4 - 2 7
P r o t e c t O K
Surround Back L ch
Check
Te s t - 4 - 2 8
P r o t e c t O K
Surround Back R ch
Check
