PRO-730HDI
117
5
6
7
8
5
6
7
8
C
D
F
A
B
E
2. P.D. (2)
Failure in the DEFLECTION SERVICE Assy.
There are six main possibilities:
1. Blown fuse (s) in secondary
2. Abnormality in the regulator of heater
3. Overload detection
4. H. deflection stopping detection
5. X-ray protection
6. V. deflection stopping
Causes
Check Items
Probable Defective Parts
Too high loading on the CONVER. AMP
Check that waveform signals are output from pin 3 and pin 1
of the CN401, CN402 and CN403, and that the DC element is
not added to the signals.
IC401, IC402
(POWER SUPPLY Assy)
CONVER. MUTING not activated
Check that the electric potential of pin 3 and pin 4 of IC401
and IC402 are at the same level when the power is turned on.
Q404, Q402
(POWER SUPPLY Assy)
If the FU1001 and FU1002 fuses are blown, see the following table:
Note: The anode of the diode is high only for a short time after the power is turned on until the protection circuits are activated (P.D.)
The LEDs are lit by the HOLD circuit.
Note that the power may be shut down when the voltages AC120V, 5V6 and STB5V from the POWER SUPPLY Assy are not
supplied because the DEFLECTION SERVICE Assy is powered by the POWER SUPPLY Assy.
When overload detection mechanism is activated, the 120 V line is short-circuited. If the power switch is set to ON again in this condition,
there may be a case where the power cannot be turned on, with just a whining sound, and where only the D111 LED in the POWER
SUPPLY Assy is lit. If this happens, disconnect the AC cord from the AC outlet or turn the main power switch OFF, and wait for five
minutes.
Be sure to check the fuses in the DEFLECTION SERVICE Assy because one or more may be blown as a result of short-circuiting of the
load circuit of the DEFLECTION SERVICE Assy.
Status
Causes
Check Items
Probable Defective Parts
D1006
ANODE
Hi
Blown fuse (s)
The voltage (approx. 23V) at R831 is not supplied.
IC401, IC402 (POWER SUPPLY Assy)
IC802 (DEFLECTION SERVICE Assy)
The voltage (approx. –23V) at R833 is not supplied.
The voltage (approx. 8V) at D1010 is not supplied.
IC1001, D1021
D1014
ANODE
Hi
Abnormally in
the regulator
for the heater
The voltage of HT + (approx. 6.4V) at C1019 + side is too high
(over 7.5V)
D1012, IC1001
D503 ANODE
Hi
Overload
detection
It checks whether the parts of the account of the right have broken.
Q603 (short-circuited between D and S)
Q511 (short-circuited between C and E)
IC5101, IC5151, IC5201 (CRT DRIVE
Assy) Short
D605 (short-circuited)
D512 ANODE
Hi
Stopping H.
deflection
Is the connector of the deflection yoke plugged in ?
Plug in the connector.
No HDRV signal at R557
IC4608 (VIDEO UCOM SERVICE Assy)
No DH. BLK signal at D506 (Cathode)
Q508, Q511
D613 ANODE
Hi
X-ray protection
No change in the ABL voltage (no DC change) at pin 10 of the
CN1907 when a 100%-white signal is repeatedly connected and
disconnected
D4614 (short-circuited) of the VIDEO
UCOM SERVICE Assy
T601 (FBT) rare short
D806 ANODE
Hi
Stopping V.
deflection
Abnormality in VDRV +, VDRV – waveform that is output from pin
2 and 6 of the CN1907 in the VIDEO UCOM SERVICE Assy
IC4608 (VIDEO UCOM SERVICE Assy)
No waveform is output from pin 4 of the CN505
IC802
