DVP-NS305, DVP-NS310, DVP-NS315, DVP-NS405, DVP-NS410, DVP-NS415, HT-1700D - Sony DVD Service Manual (repair manual). Page 77

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The IF-89 board (IF CON) test mode is the IF CON self-diagnosis
mode. The IF CON can diagnose the functions of the IF-89 board
that the IF CON controls. Normally, the IF CON makes a serial
communication with the SYSTEM CONTROL and operates fol-
lowing the commands from the SYSTEM CONTROL, but in the
Test mode, the IF CON operates independently from the SYS-
TEM 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

6. 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 monitors +3.3 V (PCONT) of MB-103 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 SYS-
TEM CONTROL)

4. LED control.

(Normally, control is made following the commands from SYS-
TEM CONTROL)

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 with the
MB-103 board are not connected to the AV-61 board, or while
pressing the  x  key on the main unit with the IF CON in
STANDBY mode, enter [RETURN] 

t [DISPLAY] (or [SET UP])

on the remote commander, and the main unit transits to the Self
Check Mode.