Troubleshooting Guide For F61 And/Or F76 - Panasonic SA-AKX95LMK Service Manual

9.2.

Troubleshooting Guide for F61 and/or F76

This section illustrates the checking procedures when upon detecting the error of "F61" and/or "F76" after power up of the unit. It is
for purpose of troubleshooting and checking in SMPS, Main & D-Amp P.C.B..
Symptom
Set cannot ON 1 AC Cord
2
3 Fuse, F1
4 Photocoupler
5 Switching Regulator
6
Set can ON 1 Speaker Output
then F61
2 D-AMP circuit
1 Main Transformer T5701
Set can ON
then F76
2
3 Photocoupler
Set can ON 1 Rectifier Diode D5801
working normally
for some time 2 Thermistor TH5860,
then F76
TH5861
Checking Items
1 AC Cord Faulty, Loose connection.
2
AC Inlet, P5701 P5701 solder crack, dry joint.
3 Fuse, F1 Open .
4 PC5702/PC5799 solder crack.
PC5702, PC5799 Dry joint, short circuit, open circuit.
5 IC5701 Faulty.
IC, IC5701
Main Transformer T5751 6a
T5751 Faulty.
6b
Switching Mode Power Supply Control IC (IC5799) faulty.
6c D5798 faulty.
1 Faulty speaker unit, Loose connection, Short.
2a
D-AMP IC, IC5700, IC5800, IC5000, IC5200, IC5300, IC5400 defective.
(Check DC voltage at speaker terminals, 3V and above defective)
2b DC Voltage ok but no sound, check DC Voltage at Pin 1.
5V ok condition, 2.5V or 0V defective.
2c
2a, 2b ok but no sound, check PWM waveform at Pin 10 and Pin 14 .
If no PWM, 24 resistors defective.
For IC5700 (R5702, R5703, R5704, R5705).
For IC5800 (R5802, R5803, R5804, R5805).
For IC5000 (R5004, R5005, R5010, R5011).
For IC5400 (R5402, R5405, R5410, R5411).
For IC5200 (R5200, R5201, R5210, R5211).
For IC5300 (R5302, R5305, R5310, R5311).
1a
Short circuit between Pin 11 and Pin 12 .
1b Short circuit between Pin 13 and Pin 14 .
1c Short circuit between Pin 16 and Pin 17 .
Regulator Circuits 2a IC2010 faulty (No +9V output).
L2000 Open.
2b
Q2022 faulty (No +5V output).
2c
2d IC2014 faulty (No +3.3V output).
2e IC2011 faulty (No +5V output).
2f L2001 Open.
3
PC5720 solder crack,
PC5720
Dry joint, short circuit, open circuit.
1a Improper contact between D5801 to Heatsink.
Rectifier Diode D5802 Improper contact between D5802 to Heatsink.
1b Set trigger temperature protection.
Possible Fault(s)
29
Remarks
Refer to
Section 9.1.1
Fig. 1. SMPS
P.C.B.
Refer to
Section 9.1.2
Fig. 3. Main P.C.B.
and Section 9.1.3
Fig. 4. D-Amp
P.C.B.
Refer to
Section 9.1.1
Fig. 1. SMPS
P.C.B.
Refer to
Section 9.1.2
Fig. 2. and Fig.3.
Main P.C.B.
Refer to
Section 9.1.1
Fig. 1. SMPS P.C.B.
Refer to Section
9.1.1 Fig. 1. SMPS
P.C.B.