Tape Sensors, Reel Sensor And Ep Sw Lever; Tape Top Sensor And Tape End Sensor; Reel Sensor - Sony SVT-N72P Service Manual

3-18. Tape Sensors, Reel Sensor and
EP SW Lever
3-18-1. Tape Top Sensor and Tape End
Sensor
1. Refer to Section 3-2 and remove the mechanism unit.
2. Refer to Section 3-3-1 and remove the cassette mecha-
nism assembly.
3. Remove the soldering from the MC-1 PWB assembly,
then remove the photo diodes 1, 2 and the LED 3.
When removing the photo diode 2 on the tape top
sensor side, refer to Section 3-15 and remove the main
cam.
Assembly Notes:
1. Fit the photo diodes 1 and 2 so that their photore-
ceptors to face the LED 3, as shown in Fig. 3-18-1.
Align the cuts in the LED 3 and the holder 4.
Push the photo diodes 1, 2 and the LED 3 as far
down as they will go, so that they do not protrude
above the top of their holders.
2. Do the soldering quickly.
Turn the photoreceptors to
face the LED 3
2 Photo
diode
(Tape end
sensor)
3 LED
Holders
Front
Fig. 3-18-1
SVT-N72P (E)
2 Photo
diode
(Tape top
sensor)
Align the cuts
4 Holder
Holders

3-18-2. Reel Sensor

1. Refer to Sections 3-12-2 and 3-12-4, then remove the
clutch mounting assembly, the T soft brake assembly
and the take up reel assembly.
2. Refer to Section 3-13-2, then remove the wheel gear 2,
the wheel gear 1, and the brake control lever.
3. Remove the soldering from the MC-1 PWB assembly,
then remove the photo diode (reel sensor) 1.
Assembly Notes:
1. When assembling the parts, align the cut on the photo
diode (reel sensor) 1 with the protrusion on the
mechanism chassis 2.
2. Do the soldering quickly.
1 Photo diode
(reel sensor)
Mounting shaft for
take up reel assem-
bly
Fig. 3-18-2
Cut
2
Protrusion
2-31