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E
D
NCODER
ISC
To remove the encoder disc:
a) Remove the screws securing the base insert, and ease the insert out of the base frame.
NOTE: Avoid damaging the LED and its leads which are clipped to the base insert.
b) Carefully lift the edge of the encoder disc until its spindle is clear of the bush in the base frame,
and slide the disc clear. It is not necessary to remove the large spur gear which drives the encoder
disc.
To install the encoder disc:
a) Apply a trace of Molycote 44 to the bush for the encoder disc spindle.
b) Ensure that the encoder disc is clean, and carefully slide its edge under the large spur gear until
the spindle can be seated in its bush.
NOTE: Later versions of the printer have a modified spur gear on the encoder disc and a flat spring
fitted to the spindle, above the spur gear. These versions are identified by the pale blue colour of
the small spur gear (the earlier versions are white). This modified gear and flat spring can only be
fitted to the later version of the base insert - they must NOT be fitted to the earlier versions.
c) Carefully fit the base insert into the base frame, and secure it with its screws; avoid damage to
the LED and its leads.
P
F
R
APER
EED
OLLER
To remove the paper feed roller assembly:
a) Remove the top cover assembly (see para 2.1).
b) Disconnect the green wire from the earth terminal.
c) Remove the screw, washer and nut which secure the earth terminal to the base frame, and
withdraw the terminal.
d) Slide the paper feed roller assembly sideways until its end disengages from its worm wheel, and
withdraw the roller assembly.
To install the paper feed roller assembly:
a) Insert the round end of the paper feed roller assembly into its mounting in the base frame.
b) Slide the square end of the roller assembly into the worm wheel, and push it fully home.
c) Secure the earth terminal to the base frame with the screw, washer and nut, and ensure that the
terminal contacts the end of the roller spindle.
d) Connect the green wire to the earth terminal.
e) Install the top cover assembly (see para 2.2).
14
Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
A
SSEMBLY
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