Pioneer SD-643HD5, Service Manual

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140
SD-533HD5, SD-643HD5
P.D.
to P.D (1) to P.D (2)
Which LED (D107 or D111)
is lit?
D111
D107
PS Assy P.D. DEF. Assy P.D.
Note: There is a case that DEF. Assy P.D. works when there is a
damage with the POWER SUPPLY Assy.
Example)
If there is not 9V, V. BLK does not come out. And P.D. hangs with
the DEFLECTION SERVICE Assy more first than the POWER
SUPPLY Assy.
D107
D111
POWER SUPPLY ASSY
SIDE A
LED points
Front
Various protection circuits are provided for this unit. When these
protection circuits are activated, the power of the unit is shut
down (P.D.: Power Down).
The defective parts can be easily diagnosed by observing the
LEDs inside the POWER SUPPLY Assy.
1. D107 in the AWV1887 (For POWER SUPPLY Assy)
2. D111 in the AWV1887 (For DEFLECTION SERVICE Assy)
7. GENERAL INFORMATION
7.1 DIAGNOSIS
7.1.1 DIAGNOSIS METHOD How to Diagnose a Failure
M
1. P.D. (1)
Failure in the POWER SUPPLY Assy.
There are four main possibilities:
1. Abnormality in the regulator of the heater
2. Blown fuse(s) in secondary
3. Abnormality in AUDIO OUTPUT
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.
In a case when the power cannot be on with no LED lit, check the following:
1. Check if the FU201 fuse in the POWER SUPPLY Assy is blown.
2. Disconnect and check connector P11 (CN302) to see whether STB 5 V is supplied.
If STB 5 V is supplied, replace the SIGNAL Assy. If STB 5 V is NOT supplied, replace the POWER SUPPLY Assy.
3. Disconnect and check connector P11 (CN302) to see whether AC CLK is supplied.
If AC CLK is supplied, replace the SIGNAL Assy. If AC CLK is NOT supplied, replace the POWER SUPPLY Assy.
Status Causes Check Items Probable Defective Parts
D318
ANODE Hi Abnormality in the
regulator for the heater The voltage of HT- at "+15V (HT-)" JP is NOT approx. 15 V, and
that of the HT+ at "+21V (HT+)" JP is NOT approx. 22 V.
Q305, R319, D313, D312
(POWER SUPPLY Assy)
D305
ANODE Hi Blown fuse(s)
The voltage HT+ (approx. 22 V) at "+21V (HT+)" JP is NOT
supplied.
DEFLECTION SERVICE Assy
The voltage (approx. 32 V) at R322 is NOT supplied. IC901, IC902
(POWER SUPPLY Assy)
The voltage (approx. 6 V) at R336 is NOT supplied.
VIDEO IP SERVICE Assy and
SIGNAL Assy
D906
ANODE Hi
Abnormality in AUDIO
OUTPUT
The SP line (CN901) is disconnected. Connect the SP line.
The voltage at the negative electrode of the C923 and C927 is
5.2 V or more. C923, C927
(POWER SUPPLY Assy)