Pioneer DV-444 Service Manual page 67

6
Diagnosis of JACB Assy
Remove the Rear Panel (Screws ×7).
1
2
Remove the JACB Assy, MJKB Assy and the POWER
SUPPLY Unit (Screws ×10)(PCB Support ×1).
3
Connect two Connection Cables for Service (GGD1222)
between DVDM Assy and JACB Assy.
4
Short-circuit W284 (GND of audio and video) on the JACB Assy
as shown in the right figure. (Audio does not come out from
output terminal that does not short-circuit.)
Note: If diagnosis was completed, be sure to remove a wire.
5
Reverse the JACB Assy and POWER SUPPLY Unit,
and arrange as figure below.
MJKB Assy
POWER SUPPLY
Unit
DVDM Assy
Loading Mechanism Assy
6
Playback with a test disc, and diagnose the JACB Assy.
4
JACB Assy
3
Connection Cable
for Service
(GGD1222)
Short point of the JACB Assy
SIDE B
W284 W284 W284
DV-444, DV-440
4
Short-circuit W284
67