Integra DTR-4.9 Service Manual page 75

OPERATION CHECK-2
SPEAKER PROTECT-2
DC Voltage detection check
[When]
1. Exchange power transistors (Q6050 - Q6054, Q6060 - Q6064).
2. Exchange amplifier PC board ass'y (NAAF-9424).
[Procedure]
Note : No load. No input.
1. Press and hold down CD button, then press On/Standby button while the unit is powered on.
" Test - _ " is displayed only for 5 seconds.
FL Display
T e s t - _
2. Press Game/TV button while the characters of " Test - _ " are displayed.
The unit will be in the state of " Test-4-00 ".
T e s t - 4 - 0 0
3. Repeatedly press + (Tone) button until the characters of " Test-4-21 " are displayed.
T e s t - 4 - 2 1
Check whether the operation starts and continues automatically as follows.
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 O K
T e s t - 4 - 2 3
P r o te c t O K
T e s t - 4 - 2 4
P r o te c t O K
If all channels are OK, the characters of " Test-4-35 " are displayed.
T e s t - 4 - 3 5
4. Press On/Standby button.
Blinks
Front L ch
Check
Front R ch
Check
Center ch
Check
Surround L ch
Check
C l e a r
T es t - 4-25
Prot e c t O K
Pro te c t
Turn off
DTR-4.9
Surround R ch
Check