General Information; Diagnosis; Diagnosis Method - Pioneer SD-533HD5 Service Manual

SD-533HD5, SD-643HD5

7. GENERAL INFORMATION

7.1 DIAGNOSIS

7.1.1 DIAGNOSIS METHOD

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)
M
POWER SUPPLY ASSY
D107
D111
LED points
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
Status Causes
D318 Abnormality in the
ANODE Hi regulator for the heater
D305
Blown fuse(s)
ANODE Hi
D906
Abnormality in AUDIO
ANODE Hi
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.
140
SIDE A
Front
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.
The voltage HT+ (approx. 22 V) at "+21V (HT+)" JP is NOT
supplied.
The voltage (approx. 32 V) at R322 is NOT supplied.
The voltage (approx. 6 V) at R336 is NOT supplied.
The SP line (CN901) is disconnected.
The voltage at the negative electrode of the C923 and C927 is
5.2 V or more.
How to Diagnose a Failure
P.D.
Which LED (D107 or D111)
is lit?
D107
to P.D (1)
PS 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.
Check Items
D111
to P.D (2)
DEF. Assy P.D.
Probable Defective Parts
Q305, R319, D313, D312
(POWER SUPPLY Assy)
DEFLECTION SERVICE Assy
IC901, IC902
(POWER SUPPLY Assy)
VIDEO IP SERVICE Assy and
SIGNAL Assy
Connect the SP line.
C923, C927
(POWER SUPPLY Assy)