DOWNLOAD Sony KV-VF21M40 Service Manual ↓ Size: 7.54 MB | Pages: 116 in PDF or view online for FREE

Model
KV-VF21M40
Pages
116
Size
7.54 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-vf21m40.pdf
Date

Sony KV-VF21M40 Service Manual ▷ View online

– 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
Item
Description
• Power does not
turn on
No. of times
STANDBY lamp
flashes
Does not light
Self-diagnostic
display/Diagnostic
result
Probable
Cause
Location
• Power cord is not plugged
in.
• Fuse is burned out F901
Detected
Symptoms
• Power does not come on.
• No power is supplied to the
TV.
• AC power supply is faulty.
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.
SELF DIAGNOSTIC FUNCTION
• FBT
• Q802 (H OUT) shorted
2 : 0 or
2 : 1
4 : 1
2 times
4 times
5 times
• Vertical deflection
stopped
• White balance
failure (no
PICTURE)
• +B overcurrent
(OCP) or
overvoltage
(OVP)
• Has entered standby state
after horizontal raster.
• Vertical deflection pulse is
stopped.
• Horizontal deflection
stopped.
• Power line is shorted or
power supply is stopped.
4 : 0
or
4 : 1
• IC501
• IC301 
 pin
• IC606
• Q802 (H OUT) shorted
• Q803
• Q608
• R803 open
5 : 0
or
5 : 1
• On standby state.
• Load on power line is
shorted
(at the same time 4 : 1 on
display).
at the same
time
(Note 1)
• CRT
• IC301
• IC701 - IC703, Q701
(CV board)
• G2 is improperly adjusted.
(Note 2)
• No raster is generated.
• CRT cathode current
detection reference pulse
output is small.
Code
Coutents
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
Code
Coutents
30h
Capstan FG NG at initial
31h
Capstan FG NG
40h
Drum FG NG
41h
Drum FG NG at initial
42h
Drum FG NG
43h
Drum PG NG
44h
Drum PG NG
50h
DEW
60h
FL NG
70h
DEW eject NG
• VCR EMG code List
– 6 –
4.
SELF-DIAGNOSTIC SCREEN DISPLAY
• For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed,
it is possible to bring up past occurances of failure for confirmation on the screen:
[To Bring Up Screen Test]
• In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
[Screen display] /
channel 
[5] /
Sound volume
[-] /
Power ON 
u
˘
Note that this differs from entering the service mode (mode volume 
[+]
).
Self-Diagnosis screen display
5.
HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY
• Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic
screen during repairs. When you have completed the repairs, clear the result display to “0”.
• Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after
completion of the repairs.
[Clearing the result display]
• To clear the result display to “0”, press buttons on the remote commander sequentially as shown below when the diagnos-
tic screen is being displayed.
• Pay attention when perform by the service mode, other all electric adjustment data will be rewrite.
Channel 
[8] / [0]
[Quitting Self-diagnostic screen]
• To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
3.
DISPLAY OF STANDBY LIGHT FLASH COUNT
* One flash count is not used for self-diagnostic.
< Diagnostic Item >
• +B OCP/OVP
• White balance failure
STOPPING THE STANDBY FLASH
• Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY lamp from flashing.
• Vertical deflection stopped
2 times
4 times
5 times
Lamp ON 0.3 sec.
Lamp OFF 0.3 sec.
Lamp OFF 3.0 sec.
< Flash Count >
STANDBY lamp (RED)
Numeral "0" means that no fault has been detected.
Numeral "1" means a fault has been detected.
diagnostic item : result
SELF CHECK
VCR : --  --
1:
2 : 1
3 :
4 : 0
5 : 1
Note: Though "1: , 3:" indicated, not using.
EMG code.
+
– 7 –
6.
SELF-DIAGNOSTIC CIRCUIT
[+B overcurrent]
Owing to current increase voltage of R615 decrease and that it make PM601 pin 
8
 to
become LOW and OFF RY601.
[+B over voltage]
When +B voltage become more than 142.5V, PM601 
8
 pin become LOW and RY601
OFF.
[Vertical deflection stopped]
Detect Vertical deflection Pulse lost by IC001 
 pin of micro computer.
Mute the picture at 
!
 pin of IC301 that performed by Y/C/J.
[White balance]
Detect when R.G.B. output wrong level balance of automatic white balance detecting
standard pulse which detect cathode current, or which become low almost.
CRT
7
3
62
52
60
49
47
41
A
42
43
A
37
21
34
35
15
SCL1
SDA1
V PULSE
LED1
OVP
VCR
RY601
RELAY
Q601
ITEM 2.
Over voltage
Detection(OCP)
BOOST
VCC
IC501
IC301
Y/C/J
HP/
PROTECT
SDA
SCL
IK IN
VM OUT
R,G,B STOP
To item 2 and 5 via bus line
MEMORY
V
STOP
IC004
• 
• 
B
ITEM 5.
Auto cut-off white balance detection(AKB)
8
3
1
PM601
D1308
PM21
FBT
(T801)
C504
 Diagnostic screen display
Q606
R614
D502
R656
+B LINE
R615
Q502
Q501
C505
R510
IC001
µ
-COM
LED flash
STANDBY
lamp
3
4
2
1
ITEM 3
Over current
Detection(OVP)
ITEM 4.
Vertical Deflection
output Detection
(V
STOP)
R613
R611
– 8 –
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts from the
Operating Instruction Manual. The page numbers of the Operating In-
struction Manual remein as in the manual.
1-1.
KV-VF21M40/VF21M70
4
Getting Started
Getting Started
Step 1:  Preparation
Check the supplied accessories
When you have taken everything out of the carton, check that you
have these items:
• Remote control
• Two R6 (size AA) batteries
• Stabilizer band
• Two clamps
• Two wood screws
• AC plug adaptor
• These operating instructions
Insert the batteries into the remote control
Note
• Do not use old batteries or different types of batteries together.
5
Getting Started
Getting Started
Step 2:  Installing the video TV
Secure the video TV
To prevent the video TV from falling, secure it using one of the
following methods:
A
With the supplied screws, attach the stabilizer band to the TV stand and to
the rear of the video TV using the existing hole.
OR
B
Pass a cord or chain through the clamps and secure them to the rear of the
video TV and a wall or pillar.
A
B
20
mm
3.8 mm
Page of 116
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