I/Q Adjustment - Panasonic DVCPRO AJ-CA901P Service Manual

Electrical Adjustment for AJ-BS900HP & CA900HP

4-4. I/Q Adjustment

BOARD BS DIGITAL
TP ENC1 OUT
ADJ. VR17 [I-GAIN], VC1
VR16[BURST PHASE], VR20 [BURST LVL]
INPUT AJ-BS900H Internal Color bar signal
Vector Scope (With 75 Ω termination)
M. EQ
Oscilloscope
SPEC. As shown below
1. Set SW2 on the BS DIGITAL Board as shown
below.
SW2-2 [Q-ON]
SW2-3 [I-ON]
2. Connect Vector scope to ENC1 OUT connector and
then adjust "Phase knob" and "Variable knob" on
the Vector scope so that the all Dots are on the Q
axis, straight.
3. Set SW2 on the BS DIGITAL Board as shown
below.
SW2-2 [Q-ON]
SW2-3 [I-ON]
4. Connect Vector scope to ENC1 OUT connector
and then adjust VC1 and VR17 so that the all dots
are on the scale of I axis.
: ON
: OFF
: OFF
: ON
5. Set SW2 on the BS DIGITAL Board as shown
below. And confirm the Vector scope's picture that
all dots are within each Inner box.
SW2-2 [Q-ON]
SW2-3 [I-ON]
6. Connect Oscilloscope to ENC1 OUT connector and
then adjust VR20 so that the Color burst level A is
40 IRE (286mV) +/- 1%.
7. Connect Vector scope to ENC1 OUT connector and
then adjust VR16 so that the Color burst phase B
meet to the scale on the Vector scope.
ELE-5
: OFF
: OFF
A
75%