Pioneer AVH-P7950DVD/RC Service Manual page 99

5
DC-DC converter adjustment
Test condition
1. DC-DC converter output : -9 V(-8.9 V) Load resistance : 220 Ω (1 W or more)
2. DDCCTL : Low(0 V) , SYSPW : HIGH(5 V)
DC-DC converter input power supply voltage : 14.4 V ± 0.2 V
Measuring point
1. Output voltage output , output noise level
DC-DC converter output : Test point(TP9021) and GND
2. Frequency
Frequency : Test point(TP9022) and GND
No.
ITEMS
1 Output voltage
2 Frequency
3 Frequency
4 Output noise level
5
6
SPECIFICATIONS
-8.9 ± 0.4 V
80 mA
Frequency
370 ± 5 kHz
DDCCTL : LOW
Frequency
425 ± 10 kHz
DDCCTL : HIGH
No filter
-30 dBs or less
AVH-P7950DVD/RC
6
7
NOTE APPLICATION
7
8
A
B
C
D
E
F
99
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