Service manual

29
VL-NZ50U/NZ100U
VL-NZ150U
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.
ADJUSTING THE ELECTROMAGNETIC CONVERSION CIRCUIT SYSTEM
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) ON/OFF does a power source.
4) Error rate check
Select and fix the TEST MODE 0B on the adjustment remote control.
5) 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.
Examples • During mechanism replacement. • During circuit board (Main) replacement. • During E
2
PROM replacement.
Tape is EJECT.
The built-in VI/O
colour bar is recorded.
VS REW
PB
Phase and
equalizer are
adjusted
automatically.
Judgment
OK:
Blue LCD comes on.
NG:
Red LCD comes on.
Synchronization error
Error rate
H
L
Phase Equalizer
H ch side 2B 27
L ch side 26 25
Synchronization error 20 or less
Error rate 200 or less (SP Mode)
330 or less (LP Mode)
3. SHUT OFF adjustment
Mode VCR ADJ mode
Procedure 1) Load a recordable tape, and set the camera mode. (Set TL911 to GND or SW901 to ON.)
2)
Press the "CONTINUE" and then the "TEST SEL" on the remote control for adjustment to enter the TEST mode (T-01 blinks).
3) Select T-03 with the FF or REW key and then press the PB key.
4) Observing the power voltage from TL2905(-), set it so that TL904(+) obtains 5.95V ± 50mV.
5) Press the MENU button on the main unit. Turn off the power and the adjustment is completed.
Examples • During microcomputer (IC701) , REGULATOR (IC704) or E
2
PROM (IC705) replacement.