Toshiba V-854G Serviceanleitung Seite 45

8)
Tape damage check
9) Checks for Hi-Fi models only.
AFM envelope output max.
point check
Recorded & reproduced
envelope chack
5) 8)
No. 9 guide laver check Check for transitional operation
1, TAPE WRINKLE CHECK
* Playback E-240 tape in Review
mode
+ Records signals in SP & LP
modes, using E-160, E-240 tape
and playback them to check
envelopes.
+ Run €-240 tape in each mode
and check there is no damage at
each guide.
Playback 3 MHz video signal.
400 Hz AFM signal in alignment
tape ST-C7 in SP mode.
1, Playback 30% white video signal
(LP mode) in alignment tape and
set review mode.
+ Contirm the portion of upper/
lower flange on No.8 guide.
Check video envelope max. point
(Ach).
2. Change mode from review to
play and check entrance side
envelope rises within 3s.
Check entrance side envelope
fised within 3s, when mode is
changed from siot-in to play.
cae 0.75
Non S-VHS mode!
OK b, dia % 0.63 it = kd
pont to AFM envelope max. point
2. NO. 9 GUIDE
if tape travels out of upperjower
flange as shown above, pinch lever
or capstan motor or No.9 guide
lever is detective.
Replace the defective part(s)
3. Adjust S guide roller to readjust
linearity.
Guide roller secton damage
Back to step 3) linearity adjustment.
(or Slider assembly replacement)
Damage at No.8 guide brush
Back to step 1) ACE head assembly
coarse adjustment
'or Pinch laver replacement
Damage at No.1 guide lower fange
Back to step 6) cheek for
transitional operaton.
'or Tension lever replacement)
Damage at No.8 guide flange
Back to step 5) No.9 guide fever ¢heck or
1) ACE head assembly coarse adjustment.
(Pinch lever, No.9 lever,
Capstan motor replacement)
Damage at guide roller sacson
Back to step 3) tinearity adustment.
{or Stider assembly replacerrant)
Playback mode
4. Check step 2 and 3 if no good,
replace S slider assy or tension
lever.
ACE height adjusung screw
ACE head
Tilt adjusting screw
6. ACE HEAD POSITION
ACE head position adjusting siit
+ Set trackin ter position
9: At its canter pasito {insert a slot-type screwdriver.)
pushing channel (tracking) up!
down buttons simultaneously.
ACE head positon screw
Azimuth adjusting screw
Playback 30% white video sig-
nal (LP mode) on the align-ment
tape Slide ACE main base to
obtain max. envelope.
Playback 2 MHz {A ch) white
awe mode) on the * VIR applied SP mode only, Use Frame advance mode Damage at No.8 guide flange
2 MHz (A ch) video signal instead
Confirm that difference from of 30% white video signal (LP
racking center is within 3 ms mode}
when maximum envelope 1s
obtained. Back to step 3) linaanty ady strrent
+ If not, readjust in LP mode.
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