Self-Diagnostic Function - Sony RA-3B Service Manual

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to fl ash. The number
of times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY/TIMER LED fl ash indicators is listed in the
instruction manual for the user's knowledge and reference. If an error symptom cannot be reproduced, the Remote Commander can be used to review
the failure occurrence data stored in memory to reveal past problems and how often these problems occur.
Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will fl ash a set number of times to indicate the possible cause of the problem. If there is more than
one error, the LED will identify the fi rst of the problem areas.
Results for all of the following diagnostic items are displayed on screen. If the screen displays a "0", no error has occurred.
Diagnostic Item STANDBY/
TIMER
fl ashes
Power not On 0
+B OCP Detection 2 times
+B OVP Detection 3 times
Vertical Defl ection Stop 4 times
Video Out Abnormality 5 times
Detection
Horizontal Defl ection Stop 6 times
Audio Abnormality 8 times
Detection
Note: 000 the range of values for number of operations is 000 - 255. For 256 or higher, the number remains as 255.
Display of Standby/Timer LED Flash Count
FRONT PANEL
– + – +
TV/VIDEO VOLUME CHANNEL
FLASH FOCUS
TIMER/STANDBY indicator
* One blink is not used for self-diagnosis.
Release of TIMER/STANDBY indicator blinking.
The TIMER/STANDBY indicator blinking display is released by turning OFF the power switch on the TV main unit or removing the plug from the
power.

SELF-DIAGNOSTIC FUNCTION

Possible Problem Location
[Standby Power Supply System]
F601 open
R607 open
Q601 short circuit
[Main Power Supply System}
IC601 and R612 are broken
VDR601 short-circuit
Short circuit of power supply in each circuit
T603 pin 7 to pin 8 is open
IC 1509 (V OUT) is broken
Q1505 (V Pulse Buffer) is broken
Video Out, Q705, 732, 761, and others in C board
C515, 516 open. IC206 (YC Jungle) is broken.
IC 406 (Audio amp.) is broken.
PS401, 402 open
• EXAMPLE
POWER
TIMER/STAND BY
Diagnosis Items
+B overcurrent
+B overvoltage
Vertical deflection stop
Lamp ON : 0.3 seconds
Lamp OFF : 0.3 seconds
Cannot turn on the power
LED doesn't blink
Goes to the standby mode
Short circuit of the +B line
Goes to the standby mode
Raster goes to one line horizontally
A and then video signal is muted.
STANDBY/TIMER LED blinks approx.
30 secs, then blinks for the diagnosis
Raster does not appear.
The sound is not out.
Goes to the standby mode
Number of Blinks
2 times
3 times
4 times
Lamp OFF :
3.0 seconds
— 6 —
KP- 43T90 / 48V90 / 53V90 / 61V90
Self Diagnosis
Supported model
Condition Detected Symptoms
2: +B OCP 000
3: +B OVP 000
4: V Stop 000
5: AKB 000
6: H Stop 000
8: Audio 000