Panasonic SA-AKX52, Service Manual

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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 checking in SMPS,D-Amp & Main P.C.B..
Symptom Remarks
Set cannot ON 1 AC Cord 1 Faulty AC Cord, Loose connection
Refer to
section 7.2.1
Fig.1 SMPS P.C.B..
Refer to
section 7.2.1
Fig.1 SMPS P.C.B..
Refer to
section 7.2.1
Fig.1 SMPS P.C.B..
Refer to
section 7.2.2
Fig.2 Main P.C.B..
2 AC Inlet, P5701 2 P5701 solder crack, dry joint.
3 Fuse, F1 3 Fuse, F1 Open
4 Photocoupler 4 PC5702/PC5799 solder crack.
PC5702, PC5799 Dry joint, short circuit, open circuit.
5 Switching Regulator
IC, IC5701 5 IC5701 Faulty.
6 Switching Regulator
IC, IC5799 6 IC5799 Faulty.
Set can ON 1 Speaker Output 1a Faulty speaker unit, Loose connection, Short.
2a D-Amp IC5000, IC5200 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.
Refer to section
7.2.3 Fig 3 D-Amp
P.C.B..
then F61
2 D-AMP circuit
1b Check output IC (Pin 10 & 14) which have DC Voltage
Set can ON 1 Transformer T5701 1a Short circuit between Pin 14 and Pin 15.
at speaker output short to Vdd/Vss.
then F76 1b Short circuit between Pin 15 and Pin 16.
1c Short circuit between Pin 16 and Pin 17.
2 DC-DC Circuit 2a Check cable wire connection between connector
ZJ2007(At Main P.C.B) & connector CN5802
2b Voltage Regulator IC (IC2010) & Switching Regulator
3 Photocoupler 3 PC5720 solder crack.
PC5720 dry joint, short circuit, open circuit.
Set can ON 1 Rectifier Diode D5801 1a Improper contact between D5801 to Heatsink
Improper contact between D5802 to Heatsink
working normally Rectifier Diode D5802
for some time 2 Thermistor TH5860 1b Set trigger temperature protection.
then F76
Possible Fault(s) Checking Items
(At SMPS P.C.B)
IC (IC2011) faulty.