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ADJUSTING THE ELECTROMAGNETIC CONVERSION CIRCUIT SYSTEM
1. PLL VCO adjustment
Mode
VCR ADJ mode
Procedure
1) Playback the alignment tape (or a self-recorded tape).
2) Call the adjustment mode (V-ADJ).
3) Set the address "2A" and call the data.
4) Set the called data with the FF/REW key to the point where the playback screen appears.
(At this time, the screen full of block noise is OK.)
Examples
• During E
2
PROM replacement. • During circuit board (Main) replacement.
2. Phase and equalizer adjustment → (Performed in the VCR mode)
Mode
VCR ADJ mode
Procedure
1) Load a self-recorded tape into the deck.
2) After playback for 3 minutes, select the test mode 0F using the remote control for adjustment to start the
automatic adjustment. (The following sequence is automatically performed.)
The built-in VI/O
colour bar is recorded.
3) Error rate check
Select and fix the TEST MODE 0B on the adjustment remote control.
4) Manual adjustment method (video adjustment mode)
* Perform this adjustment with the self-recording/playback in the LP mode.
For phase, vary the data for the address 26 and 2B, and for equalizer, vary the data for the address 25 and 27,
to set the error rate is made as small as possible.
H ch side
L ch side
Examples
• During mechanism replacement. • During circuit board (Main) replacement. • During E
ADJUSTING THE VIDEO I/O CIRCUIT SYSTEM
(Wiring board diagram: Main Side B)
1. PCO D/A-Y adjustment
Test point
TL5004 (connected to oscilloscope)
Procedure
1) Connect the AVS cable and then connect it to the monitor (TO).
2) Call the adjustment mode (V-ADJ).
3) Set the address to "22", and call the date.
(100% white signal is output.)
4) Vary the date with the FF and REW keys to set the signal appearing at TL5004 to 1.0Vp-p ± 0.05Vp-p.
2
Examples
• During E
PROM replacement. • During IC4401 replacement. • During IC1401 replacement.
PB
VS REW
Synchronization error
Phase Equalizer
H
2B
27
L
26
25
R213
Q1432
R214
R216
R1433
C1433
R212
R1434
R1435
R202
R1437
C1435
R211
R1436
C211
C213
L1402
Q1431
C1402
R1401
R5003
R5004
B35
TL5002
PCO D/A-C
Phase and
equalizer are
Judgment
adjusted
automatically.
Error rate
Synchronization error 20 or less
Error rate
C1404
R1451
C1704
C1409
C1416
IC1401
R1415
C1418
C1440
C1703
C1724
C1417
R1421
R1461
R1462
Q1405
D1403
R1729
R1730
R1705
R1706
C1412
R1731
R1732
R1413
R5007
R1722
SC5001
C1715
C1702
C1713
C1701
C1716
C1706
C1719
C1705
L1701
TL5004
PCO D/A-Y
Mode
EE mode
25
OK:
Tape is EJECT.
Blue LCD comes on.
NG:
Red LCD comes on.
200 or less (SP Mode)
330 or less (LP Mode)
2
PROM replacement.
R1715
C1726
C1727
1.0±0.05
VL-WD250S/H/E
VL-WD450S/H/E
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