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7 Troubleshooting Guide
7.1.
Troubleshooting Guide for F61 and/ or F76
This section illustrates the checking procedures when upon detecting the error of "F61" and "F76" after power up of the unit.It is for
purpose of troubleshooting and chaking in SMPS,D-Amp & Main P.C.B..
Symptom
Set cannot ON
Set can ON
then F61
Set can ON
then F76
Set can ON
working normally
for some time
then F76
Checking Items
1
AC Cord
2
AC Inlet, P5701
3
Fuse, F1
4
Photocoupler
PC5702, PC5799
5
Switching IC, IC5701
6
Switching IC, IC5799
1
Speaker Output
2
D-AMP circuit
1
Transformer T5701
2
DC-DC Circuit
3
Photocoupler
PC5720
1
Rectifier D5801
Rectifier D5802
2
Thermistor TH5860
Possible Fault(s)
1
Faulty AC Cord, Loose connection
2
P5701 solder crack, dry joint.
3
Fuse, F1 Open
4
PC5702/PC5799 solder crack.
Dry joint, short circuit, open circuit.
5
IC5701 Faulty.
6
IC5799 Faulty.
1a
Faulty speaker unit, Loose connection, Short.
1b
Check output IC (Pin 10 & 14) which have DC Voltage
at speaker output short to
2a
D-Amp IC5000, IC5200, IC5400 defective.
Check PWM output at pin 10, 14 of D-Amp IC.
Check + VDD/SS supply at pin 4 & 20 of D-Amp IC.
Check pin 1 (OSC) & pin 23 (MODE) of D-Amp IC.
Check pattern crack and solderability.
1a
Short circuit between Pin 14 and Pin 15.
1b
Short circuit between Pin 15 and Pin 16.
1c
Short circuit between Pin 16 and Pin 17.
2a
Check cable wire connection between connector
CN2014(At Main P.C.B) & connector CN5802
(At SMPS P.C.B)
2b
Voltage regulator IC (IC2010) & DC/DC Converter IC
(IC2011) faulty.
3
PC5720 solder crack.
dry joint, short circuit, open circuit.
1a
Improper contact between D5801 to Heatsink
Improper contact between D5802 to Heatsink
1b
Set trigger temperature protection.
22
Refer to
section 7.2.1
Fig.1 SMPS P.C.B..
Refer to section
7.2.3 Fig 3 D-Amp
P.C.B..
Vdd/Vss.
Refer to
section 7.2.1
Fig.1 SMPS P.C.B..
Refer to
section 7.2.2
Fig.2 Main P.C.B..
Refer to
section 7.2.1
Fig.1 SMPS P.C.B..
Remarks
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