Sharp GF-7850H(D) Serviceanleitung Seite 6

GF-7850H(D)
© MECHANICAL ADJUSTMENT
e For the details of the test tapes used for the measurement,
refer to the Table '"'TEST TAPES FOR MEASUREMENT"
on page 22.
ITEM ADJUSTMENT | REMARKS (CHECK)
POINTS
Pinch Tension gauge | Pinch roller Play, Forward:
roller pressure spring 350 — 420g
pressure Play, Reverse:
300 — 370g
* If the reading is
outside the range,
replace the
pressure spring of
the pinch roller.
Driving (More than 150 g)
power
Tape tention
measuring
cassette
Play, Forward cameron:
TW-2412
Play, Reverse
TW-2422
Torque Torque meter (Play, Forward:
Play, Forward 35 — 60 g-cm)
TW-2111 (Play, Reverse:
Play, Reverse 35 — 60 g-cm)
TW-2121 (Fast forward:
Fast-forward 85 — 125 gcm)
TW-2231 (Rewind:
Rewind 85 — 125 gcm)
TW-2231
Azimuth | Test tape Azimuth Sine waveform
MTT-114 adjusting screw | attains the
*4 Reverse maximum.
Forward
Tape Test — Variable resistor + ne
*4
To perform the azimuth adjustment, adjust the reverse
playback screw first and then the forward playback
screw,
fa
@ Reverse @ Forward
Figure 8—1 PINCH ROLLER PRESSURE AND
AZIMUTH POINT
E.V: ELECTRONIC VOLTMETER Dual-trace
External
syncroscope
speaker E.V,
Playback terminal
TecorantiayBeck
head
Figure 8—2 AZIMUTH
External
speaker
Playback
terminal
Frequency
mode
a
counter
Record/play back
head
Figure 8-3 TAPE SPEED