Sony TRINITRON KV-VF14M70 Service Manual page 5

1. OUTLINE
• The units in this manual contain a self-diagnostic function.
• If an error occurs, the STANDBY lamp will automatically begin to flash.
The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY lamp
flash 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.
2. DIAGNOSTIC TEST INDICATORS
• When an errors occurs, the STANDBY lamp will flash a set number of times to indicate the possible cause of the problem.
If there is more than one error, the lamp will identify the first of the problem areas.
• Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a "0".
Diagnostic No. of times
Item STANDBY lamp
Description flashes
• Power does not Does not light
turn on
• +B overcurrent 2 times
(OCP) or
overvoltage
(OVP)
• Vertical deflection
4 times
stopped
• White balance 5 times
failure (no
PICTURE)
Note 1: If a + B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.
The symptom that is diagnosed first by the microcontroller is displayed on the screen.
Note 2: Refer to screen (G2) Adjustment in section 3-4 of this manual.
• VCR EMG code List
Code Contents
00h NO EMG
10h CAM encode NG during unloading
11h CAM encode NG during unloading
12h CAM encode NG at intial
20h T reel NG during unloading
21h S reel FG NG
22h T reel FG NG
23h S reel FG NG
24h T reel FG NG at initial
25h S reel FG NG at initial
SELF DIAGNOSTIC FUNCTION
Self-diagnostic
display/Diagnostic
result
— • Power cord is not plugged
in.
• Fuse is burned out F901
2 : 0 or • FBT
• Q802 (H OUT) shorted
2 : 1
at the same
4 : 1
time
(Note 1)
4 : 0 • IC501
• IC301 !¢ pin
or
• IC606
4 : 1
• Q802 (H OUT) shorted
• Q803
• Q608
• R803 open
5 : 0 • CRT
• IC301
or
5 : 1 • IC701 - IC703, Q701
(CV board)
• G2 is improperly adjusted.
(Note 2)
Code
30h
31h
40h
41h
42h
43h
44h
50h
60h
70h
– 5 –
Probable
Cause
Location
• Power does not come on.
• No power is supplied to the
TV.
• AC power supply is faulty.
• On standby state.
• Load on power line is
shorted
(at the same time 4 : 1 on
display).
• Has entered standby state
after horizontal raster.
• Vertical deflection pulse is
stopped.
• Horizontal deflection
stopped.
• Power line is shorted or
power supply is stopped.
• No raster is generated.
• CRT cathode current
detection reference pulse
output is small.
Contents
Capstan FG NG at initial
Capstan FG NG
Drum FG NG
Drum FG NG at initial
Drum FG NG
Drum PG NG
Drum PG NG
DEW
FL NG
DEW eject NG
Detected
Symptoms