Marantz SR8001 Service Manual page 15

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2. When "L" of less than 100msec is detected by 29pin
(Power Amp Fail) of IC17, Speaker Relay becomes
OFF and MUTE becomes ON state, and the state
is held for 8 seconds. At this time, "PROTECT" is
displayed. When similar abnormal detection was
considered to be it for these 8 seconds, the unit will
be in standby mode and STANDBY LED will blink.
When it was not detected abnormally for 8 seconds,
the unit returns to normal use state.
29pin(_P_AMP_FAIL)
Speaker Relay
Mute
29pin(_P_AMP_FAIL)
Speaker Relay
Mute
43pin (_STANDBY)
CHECKPOINT
1. Check AMP PWB.
2. When AMP does not have a problem, it is confirmed
whether there is not abnormality by disconnection
of pattern of 29pin (Power Amp Fail) and the detect
circuit.
4. Trouble in Other
(The contents of detection are not indicated to FL.)
• When the abnormalities of ±15V power supply and the
±power supply for Power Amp are detected, the unit
will be in standby mode. The detection is performed by
66pin (P LINE FAIL).
66pin (_P_LINE_FAIL)
43pin (_STANDBY)
CHECKPOINT
1. Check Power supply circuit.
2. When Power supply circuit does not have a problem,
it is confirmed whether there is not abnormality by
disconnection of pattern of 66pin (Power Line Fail)
and the detect circuit.
29pin(_P_AMP_FAIL)
43pin (_STANDBY)
Less than 100 msec
8 Sec
"PROTECT" is displayed
13
100 msec and more
.
29pin (Power Amp Fail)
マイコンの
"L"
検出がされた場合は
ON
状態にして8秒間その状態を保持する。この間、
FL Display
"PROTECT"
に同様の異常検出がされた場合は
態にして
Front Panel
にします。8秒間、異常検出されなかった時は
通常使用状態に戻します。
回路上の確認箇所
. Power Amp
に不具合が生じている場合は修理を行
う。
. Power Amp
に不具合が無い場合は、
Fail)
のパターンの断線及び検出回路に異常が無いか確
認する。
.
その他の異常検出
FL
Caution
表示はしません)
±
15V
電源及び、
Power Amp
SET
STANDBY
した場合、
(_P_LINE_FAIL)
で行われます。
回路上の確認箇所
.
上記の電源回路に不具合が生じている場合は修理を行
う。
.
電源回路に不具合が無い場合は、
Faill)
のパターンの断線及び検出回路に異常が無いか
確認する。
100msec
未満の
Speaker Relay
OFF, MUTE
の表示を行う。この8秒間
SET
STANDBY
上の
STANDBY LED
を点滅状態
SET
29pin (Power Amp
用の±電源の異常を検出
66pin
にします。 検出は
66pin (Power Line

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