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2-1. Servo Circuit
PS506
xs
WT7O1A
TP501
C552
Main PC Board
2-1-1.
Playback Phase (PG) Adjustment
Test point:
Pins 2 and 3 of P506, Pin 5 of P201
(Video out)
Test equipment: Oscilloscope
1.
Confirm that phase difference between the fall of
the SW pulse (pin 3 of P506) and the rise of CTL
pulse (pin 2 of P506) is 11.5 + 0.5 ms.
2.
Further, observe the envelope (pin 5 of P506)
waveform, and confirm that the ACE head position
adjustment and linearity adjustment have been made,
and C-SYNC (pin 70 of 1C501) is being input during
playback.
3. Set the VTR to the STOP mode.
4. Press the unit's channel up/down buttons
simultaneouly for more than Ss.
5. Afterwards, within 2s, press the PLAY button on the
remote conwoller.
2-46
VIA
SW pulse
ae
6.5+0.5H
mets
1
1
t
Video line out
|| T ti
|
(I __—
CTL puise
H
1
1
1
1
1
1
!
1
1
'
1
1
1
1
——+!
11.5+0.5 ms
6. The automatic adjustment will be made for about 10s,
all the displays will blink. If the automatic adjustment
is not carried out, confirm that the alignment tape has
a safety tab or not, and redo from the step 3.
1) When adjustment has been completed:
The display will blink for 10s, stop blinking and
Teturn to the normal display in the STILL mode,
then it shifts to the playback display in the play-
back mode.
2) When adjustment fails:
It goes into the STOP mode.
7. Confirm that the play indicator is displayed, and
confirm that the rising and falling edge of the SW
pulse is 6.5 + 0.5H from the V-sync front edge of the
video signal.
2-1-2. Pseudo V Adjustment
Test point:
TV monitor
Test equipment: Channel up/down buttons
1, Make recordings and playback, and set to the STILL
mode.
2. Adjust the main unit's channel up/down buttons so
that center of the still screen will stop.
2-1-3. 16 MHz Crystal Oscillation Circuit (Clock)
Adjustment
Test point:
TPSO1
Test equipment: Frequency counter
Adjusting point: C552
1. Set the unit to power off mode.
2. After pressing the unit's channel up/down buttons
simultaneously for more than 5s without loading a
cassette, press the FF button on the remote controller
within 2s.
Ww
. Connect the frequency counter to TP501 and measure
the frequency.
4, Adjust C552 (trimmer capacitor) with adjusting
screwdriver so that the adjusting value 8.00002 +
0.00002 MHz is obtained.
5. The test mode is released when the power turns on and
then return to the normal operation mode.
Adjusting driver insertion point
Main PC Board
2-47
2-1-4. In Case of IC504 is Replaced
When IC504 is replaced, the data in the VTR is required
to memorize in the new one. So perform the following
procedures.
1. Press the channel up/down buttons on the VTR
simultaneously for more than 5s while the display
blinks and the unit is in the power off mode.
2. And then within 2s, press the CNACEL button on the
remote controller.
3. After displaying the address at the channel display
area and the data 'at the minute display area, set the
address to 12 using the channel up/down buttons on
the remote controller.
Next, set the data to b4 for V-804G and AS for V-
854G using the FF/REW buttons on the remote
controller. The data goes up using FF button and down
using REW button.
4, When tuming the power on, the test mode ends and
the unit returns to the normal operation mode.
V-804G
Loi
ic
rt
Address
Data
Data
Address
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