Sanyo SRT-4040 Service Manual page 9

Notes :
• Set the REC/PLAY SPEED button to indicator panel to the
8H (8 hours) mode.
• Self-recoding means "Record any broadcasting or video sig-
nal and play back the just-recorded portion".
2-1-3. SWITCHING POSITION ADJ.
Measuring Point Measuring Equipment Adj. Condition
TP101 (VIDEO Oscilloscope
OUT)
TP152 (SW-P)
Adj. Condition
REC button, EJECT button
TRACKING (+), (–) buttons
1. Play back the alignment tape, and set the tracking control
position to the center by pressing TRACKING buttons (+)
and (–) simultaneously.
2. Press the REC button three times within 10 seconds after
the display is shown. All three presses must be carried out
within 3 seconds. For the third time, press the REC button
more than 0.5 seconds as shown in Fig. 2-1-3.
3. The automatic adjustment mode is set, the numerals of
Indicator display "P 00 00" changes automatically and the
unit stops at the point the adjustment value becomes
approx. 6.5 H.
4. In the same adjustment mode, trigger at the falling edge of
the RF SW pulse, and check that the front edge of the V
sync signal from the rising edge of the RF SW pulse is
delayed by 6.5 H ± 0.5 H as shown in Fig. 2-1-4. If it is not
6.5 H ± 0.5 H, manually perform fine adjustments for the
TRACKING buttons (+) or (–) to satisfy the specification.
5. After completing adjustments, press the EJECT button (more
than 1 second) and check the Indicator shows "P – –" at
this time.
Note : Repeat steps 1 to 4 if the adjustment takes more than
20 seconds.
REC button
Start of play
back display
ON
OFF
within within
3
10 sec. 2 sec.
T=6.5H 0.5H
1H
Fall
PLAY (8H) mode
Alignment tape
VHJ-0007
Adj. Condition
6.5 H ± 0.5 H
more
then
0.5 adjusting
sec. period 10 sec.
20
Fig. 2-1-2
0.5H
Front edge of
vertical sync signal
Fig. 2-1-3
RF.SW.PULSE
2-1-4. 24H PLAYBACK MODE TRACKING ADJ.
Measuring Point Measuring Equipment
Picture of
Color bar generator
monitor (Monoscope pattern
signal), Monitor TV
Adj. Location
TRACKING (+) or (–) buttons
REC button
1. Play back the own recorded portion of the tape in the 24H
mode.
2. Use the front tracking adjustment button to fine-tune to the
optimum posiiton so that the positions of noise on the moni-
tor screen at the tracking center are vertically symmetrical.
Then press the REC button 1 second to enter this position
as the new tracking center.
3. If vertical shaking occurs at the tracking center, read just by
pushing the TRACKING buttons (no more than 3 times),
then enter this new tracking position as the tracking center.
2-1-5. F. SLOW TRACKING CONFIRM AND ADJ.
Measuring Point Measuring Equipment
Picture of Color bar generator
monitor TV (Monoscope pattern
signal), Monitor TV
Adj. Location
TRACKING (+), (–) buttons
REC button
EJECT button
1. Play back the own recorded tape and then set the VCR in
the STILL mode.
2. Change to F. Slow play back mode by pressing REC button
3 times. These 3-push must be done within 3 seconds, and
last push must be kept pressed for 0.5 seconds.
3. Set the tracking control position to the center by pressing
TRACKING (+) and (–) buttons simultaneously, and con-
firm the absence of noise in the slow playback image on
the monitor screen at this centered tracking position. Start-
ing from this centered tracking position, push the (+) and
(–) buttons and confirm that no noise appears before the
fifth push in either direction.
If noise appears before the fifth push, fine-tune with the
front tracking adjustment button so that no noise appears
before the fifth push, then press the EJECT button to make
this point the new tracking center. (When pressing the
EJECT button to enter this new tracking center, the track-
ing should be displayed.)
The FLD counter readout changes to "P – –" for approxi-
mately 1 second in order to confirm that data has been
entered.
– 9 –
Adj. Condition
Self-recording
(8H) mode
24H mode
Adj. Value
–
Adj. Condition
Self-recording
(8H) mode, PLAY
mode, Blank tape
Adj. Value
–