Sony SLV-E170EE - Adjustments after Replacing the Drum (Video Head)

2-3-4. ADJUSTMENTS AFTER REPLACING
THE DRUM (VIDEO HEAD)
Purpose: Co-relative height, X-value and other factors of the
drum will deviate from those of the guide roller. If the
drum is replaced properly, these deviations are
extremely small.
Note 1: Deactivate the automatic tracking control for setting the
mechanism in manual tracking control mode.
Note 2: To set the tracking control at the center position,
deactivate the automatic tracking control by pressing the
tracking key on the remote control
unit during threading operation (after a tape is inserted
but before the VCR starts playing back the tape).
{Adjustment Method]
There is
edge curls or wrinkles
on the tape around the
tape guide roller.
Play back alignment tape KRV-52NE. (For NTSC)
Check
the flatness in
the RF output envelope
(Refer to next page).
OK
Adjust the switching position.
Play back alignment tape KRV-52NE. (For NTSC)
Is the RF
output maximum with
the tracking controi set
at the center
position?
Adjust the center position
of the tracking control.
Adjust the switching
position.
Adjust the X-value.
Check and adjustment
have been completed.
NG
Mode
Signal
Measuring instrument
Measuring point
Adjustment locations
Does the RF output
decrease immediately when
pressing the [¥] tracking
Is the reproduced
Playback
Alignment tape KRV-52NE
(For NTSC), blank tape
Oscilloscope
CH-1: Connector PB RF pin for RF PC
board check.
CH-2: Connector RF SWP pin for RF
PC board check.
Guide roller (Refer to 2-3-1.)
Switching position (Refer to the
Service Manual)
X-value (Refer to 2-1-1, 2-1-2.)
Adjust the tape guide
roller finely.
Adjust height of the
tape guide roller.
control key?
Play back the SP section of alignment tape
KRV-51N2. (For NTSC)
Set the tracking control at the center position.
picture normal?