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e) Lightly lubricate the ends of the wormshaft with Molycote 44, and press the shaft into its support
bushes.
f) Support the base insert in the vicinity of the large spur gear, and push the drive pulley shaft fully
home into the spur gear boss which protrudes upwards through the base frame.
g) Fit the idler pulley and belt assembly.
h) Fit the top cover assembly (see para 2.2).
PCB, L
OOM AND
To remove the PCB, loom and edge-connector assembly:
a) Remove the top cover assembly (see para 2.1).
b) Remove the motor (see para 4.1).
c) Disconnect the green wire at the earth terminal.
d) Remove the two screws securing the base insert, and ease it clear of the base frame. Carefully
ease the LED and its leads out of the mounting clips on the base insert, and remove the insert.
e) Remove the two screws securing the PCB to the base frame.
f) Gently ease the photodiode and its leads out of the mounting clips on the base frame, and remove
the PCB, loom, and edge-connector assembly - take care to avoid damage to the LED, photodiode
and their leads.
To install PCB, loom and edge-connector assembly:
a) Carefully position the PCB on the base frame, with the LED and its leads passing through the cut-
out in the base frame.
b) Clip the photodiode and its leads into place on the' base frame (ensuring that the lens is facing
downwards), and secure the PCB to the base frame with its two screws.
c) Carefully insert the LED and its leads into the clips on the base insert, ensuring that the lens faces
upwards.
d) Secure the base insert to the base frame with its two screws.
e) Connect the green wire to the earth terminal.
f) Install the motor (see para 4.2).
g) Install the top cover assembly (see para 2.2).
13
Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
E
C
DGE
ONNECTOR
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