Service Mode Table - Denon DVM-4800 Service Manual

3.2 Service mode table

Pressing various button combinations on the player and remote control unit can activate the service modes.
Player mode and
Item
button combination
Jitter check In PLAY mode, press
PAUSE and OPEN buttons Jitter rate is measured and displayed.
on the player, and "5"
button on the remote
control unit.
Error code In ** mode, press PAUSE
check and OPEN buttons on the
player, and "0" button on
the remote control unit.
* With pointing of cursor
up and down on diaplay,
panel controller switches
the serial number of
history and sends out the
command accordingly.
Initial setting In STOP mode, press
of laser drive PAUSE and OPEN buttons lnitial current value for each of DVD
current on the player, and PAUSE laser and CD laser is separately
button on the remote
control unit.
DVD laser In STOP mode, press
drive current PAUSE and OPEN buttons DVD laser drive current is measured
measurement on the player, and
DISPLAY button on the
remote control unit.
ADSC internal In ** mode, press PAUSE
RAM data and OPEN buttons on the ADSC internal RAM data is read out
check player, and RETURN
button on the remote
control unit.
Servo process In STOP mode, press
display PAUSE and FWD-SKIP
buttons on the player, and ACCESS is displayed.
"7" button on the remote
control unit.
Function
Jitter check
Measurement is repeatedly done in
the cycle of one second. Read error
counter starts from zero upon mode
setting, When target block data failed
to be read out, the counter advances
by one increment. When the failure is
caused by minor error, it may be
corrected when retried to enable
successful reading. In this case, the
counter advances by one. When the
error persists even after retry, the
counter may jump by two or more.
Error code check
The latest error code stored in
EEPROM is displayed.
Initial setting of laser drive current
saved in EEPROM.
DVD laser drive current measurement
and the result is displayed together
with the initial value stored in
EEPROM.
After the measurement, DVD laser
emission is kept on. It is turned off
when POWER key is switched off. (It
is also turned off when the primary
power is switched off.)
ADSC internal RAM data check
and displayed.
Change the address with CLEAR key
operation to show the data for 11
addresses.
Servo process display
The servo process from STOP to
Display
J_xxx_yyy_zz
Focus drive value
Read error counter
Jitter rate
Jitter check mode
Jitter rate is shown in decimal
notation to one place of decimal.
Focus drive value is shown in
hexadecimal notation.
Error code (play_err) is expressed
in the following convention.
Error code=0 x DAXX is expressed: ➔ nn UXX 5 seconds later.
Error code=0 x DBXX is expressed: ➔ nn HXX
Error code=0 x DXXX is expressed: ➔ nn FXX
Error code=0 x 0000 is expressed: ➔ nn F--
* "nn" denotes the serial number
of history.
LDO_034_028
CD laser current measurement
DVD laser current measurement
Laser current measurement mode
The value denotes the current in
decimal notation. The above
example shows the initial current
is 34mA and 28mA for DVD laser
and CD laser respectively when
the laser is switched on.
LDD_034_032
Measured current
Initial current stored in EEPROM
DVD laser current measurement mode
The value denotes the current in
decimal notation. The above
example shows the initial current
is 34mA and the measured value
is 32mA.
A_DFA_6901
RAM data for specified address
Address
ADSC internal RAM data check mode
The value is shown in hexadecimal
notation. The above example
shows the data in ADSC address
DFAh is 6901h.
DVM-4800
Cancellation
method
Press STOP
or OPEN button.
Cancelled
automatically
Cancelled
automatically
5 seconds later.
Cancelled
automatically
5 seconds later.
Press STOP
or OPEN button.
Turn off the
primary power.
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