If Con Self Diagnostic Function - Sony DVP-NC675P Service Manual

6-6. IF CON SELF DIAGNOSTIC FUNCTION

1. IF-112 BOARD (IF CON) TEXT MODE
The IF-112 board (IF CON) test mode is the IF CON self-
diagnosis mode. THe IF CON can diagnose the functions of the
IF-112 board that the IF CON controls. Normally, the IF CON
makes a serial communication with the SYSTEM CONTROL
and operates following the commands from the SYSTEM
CONTROL, but in the Test mode, the IF CON operates
independently from the SYSTEM CONTROL.
In the test mode, the following functions can be checked.
1. Button function
2. Remote commander receiving function
3. SYSTEM CONTROL-IF CON serial communication
4. Click shuttle function
5. Fluorescent display tube lighting check
- Grid check
- Anode check
In the test mode, the main unit operates same as usual, except
voltage monitoring, communication, display of fluorescent
display tube.
1. The routine that monitors +3.3V (PCONT) of MV-044 board
is not provided.
2. The monitoring timer for serial communication with the
SYSTEM CONTROL is not provided. The main unit is not
placed in the Standby mode, even if the communication with
SYSTEM CONTROL is normal.
3. Display of fluorescent display tube.
(Normally, display is mode following the commands from
SYSTEM CONTROL).
2. OPERATION OF SELF CHECK MODE
The Self Check mode is the function to conduct the basic test to
the FL display and DVD panel section.
2-1. Self Check Mode Transition Processing
At the AC Power ON after reset of IF CON is released, while
pressing with the MV-044 board are not connected to the IF-112
board, or while pressing the
x
CON in STANDBY mode, enter [RETURN] t [DISPLAY] (or
[SETUP]) on the remote commander, and the main unit transits to
the Self Check Mode.
key on the main unit with the IF
6-4