Pioneer AVIC-HD3, Service Manual

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AVIC-Z1/UC
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5 6 7 8
5 6
7
8
C
D
F
A
B
E
6.4 PLL ADJUSTMENT
When parts shown below are replaced, adjustment is required.
IC4001 inside the CC unit
•
Part replacement on PLL circuit area block on the CC unit.
Distortion of the screen
(Please refer to the pictures below.)
1
With HDD unconnected, connect the navigation unit to the product and apply power.
(The caution " HDD is unconnected. " will appear in 10 seconds.)
2
Confirm that the voltage on both sides of C4024 (B side) attached to IC4002 power supply terminal
pin No.16 is within 3.3
±
0.1V.
3
Control the potential of the sensing pin DEM (B side) at the IC4002 DEMOUT terminal (10 pin) to within
1.5
±
0.1V while adjusting the VR4001(A side).
Be aware that extension of a CC unit, etc may cause the potential of 3.3 V to go beyond the limit.
When parts are replaced in IC4001(NAVICORE)/PLL circuit area, adjustment is required.
Other cases than that also require confirmation.
<How to adjust VR of PLL area>
[Purpose]
[The sign of insufficient adjustment]
[Method]
[Concerns]
B side of the CC unit The scale-up of B side of the CC unit
C4024
Potential of both ends
3.3V
±
0.1V
PLL IC
IC4002
Sensing pin
DEM
C4024
Sensing pin
DEM
1.5V
±
0.1V