Service manual

34
VL-Z1U
Mode VCR ADJ mode
Adjusting 1) Play back the alignment tape. (A tape recorded on this unit may be used instead of the alignment tape.)
method 2) Select the adjustment mode (V-ADJ).
3) Select address "2A" to call up the data.
4) Using the FF and REW keys, adjust the data value so that reproduced pictures are shown. (Even if block
noise occurs at this time, it is allowable.)
Note: After the address "2A" data has been adjusted, be sure to make the error rate adjustment.
Examples · Replacement of circuit board (main) · Replacement of E
2
PROM
ADJUSTMENT OF MAGNETIC PARAMETRIC CIRCUIT SYSTEM
1. Adjustment of PLL VCO
2. Adjustment of phase and equalizer → (To be performed in the VCR mode)
Mode VCR ADJ mode
Adjusting 1) Set a error rate adjustment tape (RTPEVA001WJZZ).
method 2) Select test mode 0F using the adjustment remote control. Automatic adjustment will be started (the following
sequence will be performed automatically).
3) Turn ON and OFF the power.
4) Checking of error rate
Select test mode 0B using the adjustment remote control.
5) Manual adjusting method (video adjustment mode)
* In this adjustment, play back a tape recorded on this unit in the LP mode.
Change the data values at addresses 26 and 2B for the phase and the data values at addresses 25 and 27 for
the equalizer so that the error rate is minimized.
Examples · Replacement of mechanism · Replacement of circuit board (main) · Replacement of E
2
PROM
Tape EJECT
Recording of built-in
VI/O color bar
VS REW
PB
Automatic
adjustment of
phase and
equalizer
Judgment
OK:
Blue indication on LCD
NG:
Red indication on LCD
Sync error
Error rate
H
L
Phase Equalizer
H ch side 2B 27
L ch side 26 25
Sync error 20 or less
Error rate 200 or less (SP Mode)
330 or less (LP Mode)
3. Adjustment of shutdown
Mode VCR adjustment mode
Adjusting 1) Set a recordable tape and select the camera mode.
method 2) Press "CONTINUE" → "TEST SEL" on the adjustment remote control to enter the TEST mode (T-01 flashing).
3) Select T-03 with the FF and REW keys and press "PB" key.
4) Adjust the power supply voltage so that TL904(+) becomes 6.00V ± 50mV as viewed from TL900(-).
5) Press the "Display change" button on the main unit. Turn OFF the power.
Examples · Replacement of microcomputer (IC701), Regulator (IC704) and E
2
PROM (IC705)