Pioneer PRO-730HDI Service Manual page 117

5
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
Status Causes
D1006
ANODE Blown fuse (s)
Hi
D1014 Abnormally in
ANODE the regulator
Hi for the heater
D503 ANODE Overload
Hi detection
D512 ANODE Stopping H.
Hi deflection
D613 ANODE X-ray protection
Hi
D806 ANODE Stopping V.
Hi deflection
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.
If the FU1001 and FU1002 fuses are blown, see the following table:
Causes
Too high loading on the CONVER. AMP
CONVER. MUTING not activated
5
6
Check Items
The voltage (approx. 23V) at R831 is not supplied.
The voltage (approx. –23V) at R833 is not supplied.
The voltage (approx. 8V) at D1010 is not supplied.
The voltage of HT + (approx. 6.4V) at C1019 + side is too high
(over 7.5V)
It checks whether the parts of the account of the right have broken.
Is the connector of the deflection yoke plugged in ?
No HDRV signal at R557
No DH. BLK signal at D506 (Cathode)
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
Abnormality in VDRV +, VDRV – waveform that is output from pin
2 and 6 of the CN1907 in the VIDEO UCOM SERVICE Assy
No waveform is output from pin 4 of the CN505
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.
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.
6
7
Check Items
PRO-730HDI
7
8
Probable Defective Parts
IC401, IC402 (POWER SUPPLY Assy)
IC802 (DEFLECTION SERVICE Assy)
IC1001, D1021
D1012, IC1001
Q603 (short-circuited between D and S)
Q511 (short-circuited between C and E)
IC5101, IC5151, IC5201 (CRT DRIVE
Assy) Short
D605 (short-circuited)
Plug in the connector.
IC4608 (VIDEO UCOM SERVICE Assy)
Q508, Q511
D4614 (short-circuited) of the VIDEO
UCOM SERVICE Assy
T601 (FBT) rare short
IC4608 (VIDEO UCOM SERVICE Assy)
IC802
Probable Defective Parts
IC401, IC402
(POWER SUPPLY Assy)
Q404, Q402
(POWER SUPPLY Assy)
8
A
B
C
D
E
F
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