Panasonic SA-XH50P, Руководство по обслуживанию

Страница: 36 / 131

36
8 Troubleshooting Guide
8.1. 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 P.C.B..
Symptom(s) Checking items Possible Fault(s) Remarks
Set cannot Power ON:
Condition 1: With
Stanby LED on
1
2
1
Solder crack,dry joint ,short
circuit,open circuit,etc
AC cord
AC Inlet P5701
1 Faulty AC cord, loose
connection
2
2
Solder crack,dry joint ,short
circuit,open circuit,etc 4
Check FFC connection/
alignment from SMPS (H2016)
to Main (CN100) 2
P5701 solder crack, dry joint
etc
Faulty IC2900
Set can Power ON
then F61
Set can Power ON
then F76
Set can Power ON
working normally for
sometime then F61
Condition 2: With
Stanby LED Off or
flickering
3
1
2
3
3 F1 Fuse open Fuse F1
DC-DC circuit
1 Thermal Diode D5706
SMPS FFC loose
Voltage regulator
4 Photocoupler PC701
1 Transformer T5701
2 Photocoupler PC701
1a Pin 14/15 shorted to pin 12/13
1a
1b
L421 Open (no input to
IC106)
Faulty IC106 (no output
voltage at pin 3)
1a
1b
Improper contact between
D5706 to heatsink
OTP (thermal) protection
trigger prematurely
3a Faulty Q107 Transistor diode
check (cannot switch ON then
NO +9V)
3b K304 Open (+3V line going
to Panel PCB CN203)
1c Faulty Q100 (regulator)
1d L125 open (No DC +5V)
1e R100 open (No DC +9V)
1) Refer to Fig. 1. SMPS P.C.B.
Refer to Fig. 1. SMPS P.C.B.
Refer to Fig. 1. SMPS P.C.B.
Refer to Fig. 1. SMPS P.C.B.
Refer to Schematic Diagram of
SMPS Circuit (Item 17.7) for
terminal pin count on primary and
secondary terminals
SMPS Circuit (Item 17.7)
2) Refer to Schematic Diagram of
1) Refer to Fig. 2. Main P.C.B.
Main Circuit (Item 17.3)
2) Refer to Schematic diagram of
1) Refer to Fig. 2. Main P.C.B.
Main Circuit (Item 17.3)
2) Refer to Schematic diagram of
1 Regulator IC IC2900