Sony DVP-NS777P, Service Manual

Page: 61 / 82

6-4
6-6. IF CON SELF DIAGNOSTIC FUNCTION
1. IF-113 BOARD (IF CON) TEST MODE
The IF-113 board (IF CON) test mode is the IF CON self diagnos-
tic mode. The IF CON can diagnose the functions of the IF-113
board that the IF CON controls. Normally, the IF CON makes a
serial communication with the SYSTEM CONTROL and oper-
ates 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. Fluorescent display tube lighting check
Grid check
Anode check
5. LED control function
In the Test mode, the main unit operates same as usual, except
voltage monitoring, communication monitoring, display of fluo-
rescent display tube, and LED control.
1. The routine that mo3.3 V (P-CONT) of MV-044 board
is not provided.
2. The monitoring timer for serial communication with the SYS-
TEM CONTROL is not provided. The main unit is not placed
in the Standby mode, even if the communication with SYS-
TEM CONTROL is normal.
3. Display of fluorescent display tube (normally, display is made
following the commands from SYSTEM CONTROL)
4. LED control (normally, control is made following the com-
mands from SYSTEM CONTROL)