Pioneer PDP-434PG Service Manual page 50

1
AUDIO SECTION
Measurement condition
A
Video Input Signal : FULL FIELD COLOR-BAR
Audio Input Signal : 1kHz Sine Carve 0.2Vrms
Volume : 60 (MAX)
AV Selection : STANDARD
SRS : OFF
FOCUS : OFF
B
AUDIO AMP ASSY
C
CN5001 - pin 4 (L) ↔ GND
1
V: 0.1V/div. H: 0.2msec/div.
D IC5202 - pin 14 (LOUT) ↔ GND
2
V: 0.1V/div. H: 0.2msec/div.
IC5201 - pin 19 (FOCUSOUTL) ↔ GND
3
E
V: 0.1V/div. H: 0.2msec/div.
F
48
1
2
Caution in the measurement
Audio Power Amp. (IC5002: LA4628) on the AUDIO AMP Assy is BTL system, and,
as for the power amplifier and the speaker output, ± poles becomes hot for the
ground. Therefore be careful not to connect the measuring instrument as the following
figures. (Power amplifier may be damaged.)
IC5002 - pin 1 (IN1) ↔ GND
4
V: 0.1V/div. H: 0.2msec/div.
4.4V
J5003 - pin 5 (L+) ↔ GND
5
V: 1V/div. H: 0.2msec/div.
5.8V
J5003 - pin 6 (L–) ↔ GND
6
V: 1V/div. H: 0.2msec/div.
5.9V
PDP-433PU
2
3
Oscilloscope
CH1 CH2
GND and the speaker output (- side) becomes
a short state on the oscilloscope.
1
etc.
7
Measurement
Point
AUDIO AMP SP TERMINAL
ASSY
Wrong connection example
J5003 - pin 5 (L+) ↔ pin 6 (L–)
7
V: 2V/div. H: 0.2msec/div.
1.6V
7.3V
7.3V
3
4
10
Speaker
ASSY
SP TERMINAL ASSY
CN5301 - pin 1 (L+) ↔ GND
8
V: 1V/div. H: 0.2msec/div.
0V
CN5301 - pin 2 (L–) ↔ GND
9
V: 1V/div. H: 0.2msec/div.
CN5301 - pin 1 (L+) ↔ pin 2 (L–)
10
V: 2V/div. H: 0.2msec/div.
4
7.3V
7.3V
0V