Sony PS-2250 - Microswitch Replacement

Fig. 2-7. Motor removal
CAUTION
Electromagnetic brake adjustment
(clearance between turntable and magnet
turntable
To FG coil To Motor
co LK “"
~ }
test point
ac21+2V 3
Fig. 2-9. Test point for electromagnetic
brake adjustment
2-8. MICROSWITCH REPLACEMENT
mounted on turntable base) should be
Performed, ab Zollows after replacing: the 1. Remove the turntable base as described in
PIOPOES Procedure 2-3.
1. First of all, confirm that the turntable 2. Unhook the spring pressing the microswitch
does not touch with the magnet on the holding shaft against its bracket. Carefully
turntable base (See Fig. 2-8). If it does, draw out the microswitches along with their
adjust the magnet height by replacing holding shaft as shown in Fig. 2-10.
i ACR OUS Diaks. 3. Remove the retaining rings at one side of the
Three kind of mounting plate are
available as specified in table below.
To remove the magnet and mounting
plate, apply a few drops of cement
solvent to them.
shaft, and then replace the defective micro-
switch as shown in Fig. 2-10.
To. reassemble, reverse the aforementioned
procedure.
[EP Model] 1 [AEP Model]
Description Thickness of plate (mm) | Part Number
Mounting plate, ; 1.6 4-8 08-445-02
5 magnet 1.0 4-8 08-445-11
0.5 4-8 08-445-21
2. Set the turntable for 33-1/3 rpm
operation, and then measure the voltage
applied to the motor at the 5-p termi-
nal strip as shown in Fig. 2-9. It
should be within the limits of 21 +2
volts ac. If not, readjust the clearance
between the turntable and the magnet
by replacing the mounting plate as
previously described.
SS Qe
SH
Fig. 2-10. Microswitch replacement