Troubleshooting - JVC HD-Z56RF7 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.Diagnosis is displayed in 2 ways via screen display and LED
flashes. Failure detection is based on input state of I
the various control lines connected to the main microcomputer.
5.1.2 HOW TO ENTER THE SELF CHECK MODE
Before entering the Self check mode, confirm that the MODE SW
of the REMOTE CONTROL UNIT is set to "TV". If the
switch has not been properly set, you cannot enter the Self
check mode.
(1) Press the [DISPLAY]
simultaneously, then enter the SERVICE MODE.
(2) Press the [2] key (SELF CHECK) before the service mode
screen disappears.
(3) Self check mode screen is displayed.
(4) Press the [red] key to enter Page 2 of the SELF CHECK
MODE.
• When the [RETURN+] key pressed, the first page
change screen.
NOTE:
When a number key other than the [2] key is pressed in
the SERVICE MENU SCREEN, the other relevant
screen may be displayed.
This is not used in the SELF CHECK. Press the [MENU]
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 [POWER] 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.
SECTION 5

TROUBLESHOOTING

2
C bus and
key and [MUTING] key
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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
diagnosis reults.
SERVICE MENU SCREEN
SERVICE MENU SERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
SELF CHECK MODE SCREEN (Page 1)
LOB LOB 0 0
AUD AUD 0 0
ANA ANA 9 9
0000 0000
Item
SELF CHECK MODE SCREEN (Page 2)
TMP TMP 0 0
L 2 L 2 0 0
FAN FAN 0 0
IRS IRS 0 0
Item
2
C bus
FAN FAN 0 0
DIG DIG 9 9
0 0
0 0
Failure history
L 1 L 1 0 0
DDT DDT 0 0
L C L C 0 0
Failure history
Fig.1
(No.YA460)1-35