Sony TRINITRON KV-42DRC700 Service Manual page 8

To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially,
in rapid succession, as shown below:
Channel 5
DISPLAY
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 when the diagnostic screen is displayed, as shown below:
Channel 8
ENTER
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-Diagnostic Circuit
A
IC701
MAIN UCOM
HA
STBY LED STR
29
48 STBY-LED CLKO
DATO
30
44 OCP
45 OVP
43
LOW B ERR
AC RLY
69
SET 5V
UNREG 7V
D6014
D6018
OVP
White Balance Failure
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC201. TV will stay on, but there
will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
Low B OCP/OVP Error
Occurs when set 5V is out.
Horizontal Defl ection Stopped
Occurs when either: 1) a +B overcurrent is detected (IC5007), or 2) overheating is detected (Thermistor TH5002).
Sound volume - Power ON.
RY6501
Q6527
Q6530
D
Q6532 200V OCP
D6537
OVP
+B OCP
D6501
A
IC6007
I 0
0
SELF DIAGNOSIS
2: +B OCP
3: +B OVP
4: V STOP
5: AKB
6: LOWB
7: H-STOP
101: WDT
A
IC201
Y/C JUNGLE
AKB 58 CRT
26 SCL
35
VPROT VDY -
25
SDA
34
HPROT
SET ON
R5125
D8027
D8003
D
1
IC6505
+B
+B OVP
Q6520
Q6521
— 8 —
N/A
N/A
Numeral "0" means that no fault
0
was detected.
1
Numeral "1" means a fault was detected
0
one time only.
0
24
+B Overcurrent (OCP)
Occurs when an overcurrent
(more than 6A) on the +B
(135V) line is detected by
R6598/R6591. It will cause
R5104 R5105
Q6520 to turn on and force the
Q5018
AC relay to turn off through
Q6532 and Q6530.
2 14
IC5007
+B Overvoltage (OVP)
Occurs when 1) overvoltage
I5V
(more than +140V) on the
+B (135V) line is detected by
IC6505, or 2) an overvoltage
(more than 7.5 V) on the unreg
Q6522
7V line is detected by D6014.
2
The AC relay will turn off
through Q6532 and Q6530.
3
STBY 5V
Vertical Defl ection Stopped
Q6524
Occurs when an absence of
the vertical defl ection pulse
is detected by IC201. Power
supply will shut down when
waveform interval exceeds 2
seconds.
KV-42DRC700