9-7
VL-PD3S/H/E VL-PD3S/H/E
ADJUSTING THE ELECTROMAGNETIC CONVERSION CIRCUIT SYSTEM
Note:
During the adjustment of the electromagnetic conversion circuit system, keep R3404 out of operation.
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 to "2C", and call the data.
4) Using the FF key, vary the data that has been called until the playback image screen changes to the blue back
screen. Then use the REW key to vary the data backward until the data point is found where the screen starts
to switch from the blue back to the playback image. At this time, take note of the data obtained at this point.
5) As in the above step 4), vary the data that has been called - this time using the REW key - until the playback
image screen changes to the blue back screen. Then use the FF key to vary the data backward until the data
point is found where the screen starts to switch from the blue back to the playback image. At this time, take
note of the data obtained at the point.
6) Calculate the data taken note of at the points
A
and
B
to find the center of these data, and shift
to and determine the central data by using the
FF or REW key.
Example: If the data taken note of at points
A
and
B
are 5A and 65, respectively:
Examples • During Circuit board (Main) replacement.
• During E
2
PROM replacement.
Playback screen
Step 4)
FF key
Step 5)
REW key
Blue back
Blue back
Position at which note
is made of the datum
Position at which note
is made of the datum
BA
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.)
3) Error rate check
Select and fix the TEST MODE 0C 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 2B, and for equalizer, vary the data for the address 27, to set the error
rate to the minimum.
Examples • During mechanism replacement. • During circuit board (Main) replacement.
• During E
2
PROM replacement.
Error rate
Synchronization error 20 or less
Error rate 200 or less (SP Mode)
330 or less (LP Mode)
5A. 5B. 5C. 5D. 5E. 5F. 60. 61. 62. 63. 64. 65
Blue back area
Blue back area
Center
Note
Note
A
B
The central data is set to "5F".
Tape is EJECT.
The built-in PPW
colour bar is recorded.
VS REW
PB
Phase and
equalizer are
adjusted
automatically.
Judgment
OK:
LCD comes on [OK].
NG:
LCD comes on [NG].
Synchronization error
To Next Page
Loading...
