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4-2. Main Troubleshooting on Each Section
1. Troubles on Power Supply Section
Symptom
1-1.
Voltage +B not supplied to F-2513, F-2515 or F-2507
1) Defective AC line of power section
1,
2.
3.
4,
2) +85V, Input voltage not supplied to F-2508
5.
6.
3) +35V not suppied to F-2513 and F-2515
7.
8.
9.
4) +65V not supplied to F-2507-
10.
Laat.
12
. Defective ZD02 on F-2508
2. Troubles on Power Amplifier Section
2-1.
Power Amplifier inoperative (Protector lamp lighted)
1) AC Fuse opens
2) AC fuse not opened —
2-2. Inproper Bias ——
|
8
3. Buffer Amplifier or Subsonic Filter Inoperative
Wh
Sy :OE
Bef
1) Low and high filter inoperative
1.
|
[_,
2) MONO
(B.T.L.) circuit inoperative
3.
aa
4. Troubles on Power Meter Circuit
1.
2.
3.
4.
5.
5. Troubles on Speaker Protector Circuit
1) Relay, RLO1 not switched OFF
1.
2
3.
2) RLO1 & RLO2 not switched OFF at the moment
4,
when setting power switch to ON
5.
6.
7.
4) Protector indicator lamp not ie
a
10.
_
Cause
AC Fuse F701 open
Imperfect contact of AC switch, $702
RO1 or RO2 open on F-2511
Inoperative inrush absorber circuit
FO1 or FO2 open on F-2511
Defective DO3 or D04 on F-2511
Defective DO1 or D02 on F-2508
Defective TRO1, TRO2 or TROS~TR11 on
F-2508
Defective ZDO1 on F-2508
Defective DO1 or D02 on F-2508
Defective TRO3, TRO4 or TR11~TR16
. Power transistor shorted
. TRO1 opened on F-2509
TR10 or TR11 shorted on F-2507
TRO8 or TROY shorted on F-2507
D06 or DO7 shorted on F-2507
TRO2, TRO6 or TRO7Z shorted on F-2507
VRO2 or VRO3 out of adjustment or defective
on F-2507
. TRO1 shorted on F-2509
Imperfect contact of $01 on F-2513
Defective TRO7~TR10 on F-2513
Defective MODE switch $701 or relay RLO1
Defective TRO2, TRO4 or TRO6 on F-2513
VRO1 or VRO2 out of adjustment or F-2515
Defective 1C0O1 or F-2515
Defective D01~D04 or F-2515
Defective TRO1~TRO3 or F-2515
Defective power meter
Defective D0O9~D14 on F-2511
Defective TRO3 or TRO4 on F-2511
Defective reley, RLO1
Defective C08 on F-2511
Defective TRO1 or TRO2 on F-2511
Defective relay, RLO2
RLO1 inoperative due to defective D17 on
F-2511
Defective posistor PRO1 on F-2509
Defective TRO5 on F-2511
. Defective LED, LD701
*As each voltage of speaker protector circuit floats from chassis, it can not be measued to the earth point.
. *Refer to Schematic Diagram.
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