Troubleshooting Guide; Troubleshooting Guide For F61 And/ Or F76 - Panasonic SA-AKX72PH Service Manual

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
Set cannot ON 1
2
3
4
5
6
Set can ON 1
then F61
2
Set can ON 1
then F76
2
3
Set can ON 1
working normally
for some time 2
then F76
Checking Items
AC Cord 1
AC Inlet, P5701 2
Fuse, F1 3
Photocoupler 4
PC5702, PC5799
Switching Regulator 5
IC, IC5701
Switching Regulator 6
IC, IC5799
Speaker Output 1a
1b
D-AMP circuit 2a
Transformer T5701 1a
1b
1c
DC-DC Circuit 2a
2b
Photocoupler 3
PC5720
Rectifier Diode D5801 1a
Rectifier Diode D5802
Thermistor TH5860 1b
Possible Fault(s)
Faulty AC Cord, Loose connection
P5701 solder crack, dry joint.
Fuse, F1 Open
PC5702/PC5799 solder crack.
Dry joint, short circuit, open circuit.
IC5701 Faulty.
IC5799 Faulty.
Faulty speaker unit, Loose connection, Short.
Check output IC (Pin 10 & 14) which have DC Voltage
at speaker output short to Vdd/Vss.
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.
Short circuit between Pin 14 and Pin 15.
Short circuit between Pin 15 and Pin 16.
Short circuit between Pin 16 and Pin 17.
Check cable wire connection between connector
ZJ2007(At Main P.C.B) & connector CN5802
(At SMPS P.C.B)
Voltage Regulator IC (IC2010) & Switching Regulator
IC (IC2011) faulty.
PC5720 solder crack.
dry joint, short circuit, open circuit.
Improper contact between D5801 to Heatsink
Improper contact between D5802 to Heatsink
Set trigger temperature protection.
23
Remarks
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..
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..