Troubleshooting - JVC AV-27F577/R Service Manual

5.1 SELF CHECK FEATURE
5.1.1 OUTLINE
This unit comes with the "Self check" feature, which checks the
operational state of the circuit and displays/saves it during
failure. Diagnosis is performed when power is turned on, and
information input to the main microcomputer is monitored at all
time. Failure detection is based on input state of I
various control lines connected to the main microcomputer.
5.1.2 HOW TO ENTER THE SELF CHECK MODE
(1) Set to "0 minutes" using the [SLEEP TIMER] key.
(2) While "0 minutes" is displayed, press the [VIDEO STATUS]
key and [DISPLAY] key simultaneously, then enter the
SERVICE MODE.
(3) Press the [4] key (4.Diagnostics) in the SERVICE MENU
SCREEN. (Fig.1)
(4) Press the [3] key (3.Self check) in the DIAGNOSTICS
MODE screen. (Fig.2)
(5) The SELF CHECK MODE screen is displayed. (Fig.3)
(6) Press the [VOL+] / [VOL-] key to switch between the first
page and the second page.
NOTE:
When a number key other than the [4] key is pressed in
the SERVICE MENU SCREEN, the other relevant
screen may be displayed.
This is not used in the SELF CHECK MODE. Press the
[BACK] key to return to the SERVICE MENU SCREEN.
5.1.3 HOW TO EXIT THE SELF CHECK MODE
TO SAVE FAILURE HISTORY:
Turn off the power by unplugging the AC power cord plug
when in the SELF CHECK MODE.
TO CLEAR (RESET) FAILURE HISTORY:
Turn off the power by pressing the key on the remote control
unit when in the SELF CHECK MODE.
5.1.4 FAILURE HISTORY
Failure history can be counted up to 9 times for each item. When
the number exceeds 9, display will remain as 9. Failure history
will be stored in the memory unless it has been deleted.
5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK
FEATURE
In addition to circuit failures (abnormal operation), the following
cases may also be diagnosed as "Abnormal" and displayed and
counted as "NG".
(1) Temporary defective transmissions across circuits due to
pulse interruptions
(2) Misalignment in the on/off timing of power for I
(VCC) when turning on/off the main power.
Diagnosis may be impeded if a large number of items are
displayed as "NG". As such, start Self check check only after 3
seconds in the case of receivers and 5 seconds in the case of
panels upon turning on the power. If recurrences are expected,
ensure to clear (reset) the failure history and record the new
diagnostic reults.
1-30 (No.YA387)
SECTION 5

TROUBLESHOOTING

2
C bus and the
Press [4] key
Press [3] key
Normality=OK
Abnormality=NG
Not used= ---
Normality=OK
Abnormality=NG
Not used= ---
2
C bus
SERVICE MENU SCREEN
Service Menu
1.Digital Service
2.TV-Micro Service
3.Conver Service
4.Diagnostics
Fig.1
Diagnostic MENU SCREEN
Diagnostic
1.I2C Bus Stop
2.Status Monitor
3.Self Check
4.Version
5.Save Config data to SD card
6.Load Config data
7.Boot from NFS
8.Debug Log
Fig.2
SELF CHECK MODE SCREEN (Page 1)
Self Check
X-RAY ---
OCP ---
LOB ---
TIM OK
PHOTO ---
HostLink OK
FAN ---
Item
CHECK
<> Previous/Next Page [BACK]Back [MENU]Exit
Press [VOL+] / [VOL-] key
SELF CHECK MODE SCREEN (Page 2)
Item
Self Check
MTS OK RGB/DEF
TONE OK
AVSW OK A-EEPROM OK
CompSW ---
ADC NG(9)
TUNER OK
AudioADC ---
HDMI ---
CHECK
<> Previous/Next Page [BACK]Back [MENU]Exit
Fig.3
OK