Panasonic AG520VDH - COMB. DVD/VCR/TV, Service Manual

Page: 28 / 100

7.3. ELECTRICAL ADJUSTMENT
Note:
Following Adjustments have been preadjusted at factory and
are not required.
· Purity Adjustment
·
Convergence Adjustment
7.3.1. TEST EQUIPMENT
To do all of these electrical adjustments, the following
equipment is required.
1. Dual-Trace Oscilloscope
Voltage Range: 0.001 V to 50 V/Div.
Frequency Range: DC to 50 MHz
Probes: 10:1, 1:1
2. NTSC Video Pattern Generator
3. Isolation Transformer (Variable)
4. VHS Alignment Tape (VFMS0003H6)
5. Degaussing Coil
6. White Pattern Generator
7.3.2. HOW TO READ THE ADJUSTMENT
PROCEDURES
Fig. E1
7.3.3. EVR (Electronic Variable Register)
ADJUSTMENT WITH THE REMOTE
CONTROL
This unit has electronic technology using I
2
C Bus concept.
The following control functions are adjusted by using "On
Screen Displays" and the remote control instead of adjusting
mechanical controls (VR).
7.3.4. EVR ADJUSTMENT ITEM
The following Items need to be adjusted for EVR adjustment.
· SUB CONTRAST ADJUSTMENT
· FOCUS, SCREEN, CUT OFF, DRIVE ADJUSTMENT
· SUB COLOR/SUB TINT ADJUSTMENT
·
DEFLECTION DISTORTION CORRECTION
ADJUSTMENT
·
WHITE BALANCE ADJUSTMENT
·
SUB BRIGHTNESS ADJUSTMENT
7.3.5. HOW TO ENTER EVR
ADJUSTMENT MODE
Press and hold STOP/EJECT, PLAY and VOL- buttons of VCR
operation panel on the unit together over 5 seconds with no
cassette inserted.
The adjustment overlay will appear to Enter EVR adjustment
mode.
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AG-520VDH