ZX Spectrum Harlequin 128k kit build Final Part 5 - Integrated Circuits - keyboard fix and testing.

#zxspectrum #harlequin128k #harlequinkit
So this is it, the last part and we fit all the logic chips, loom at the SPectrum Plus case I brought and replace the faulty membrane and run some diagnostics. You can find the time stamps for the IC installation below
KM681000/HM628128
U3 1:26
U8 1:37
74HC00
U23 2:36
U20 2:58
U27 3:07
U51 3:44
74HC04
U13 4:33
74HC08
U53 5:00
U11 5:16
U24 5:35
U26 6:18
U29 6:45
74HC11
U55 7:32
74HC32
U52 8:02
U22 8:15
U12 8:32
U5 8:51
U21 9:10
U28 9:24
74HC74
U9 9:47
U10 9:57
U19 10:10
U45 10:20
74HC86
U30 10:45
74HC138
U4 11:05
U17 11:22
U18 11:33
74HC161
U14 11:59
U15 12:10
U16 12:18
74HC166
U34 12:33
74HC174
U50 13:33
74HC245
U40 13:58
U43 14:06
U44 14:12
74HC253
U31 14:37
U32 14:44
74HC257
U41 15:19
U42 15:27
74HC541
U6 16:28
74HC574
U33 16:50
U35 16:55
U36 17:02
74HC4040
U25 17:26
U37 17:33
U38 17:40
TL712
U49 17:59
Z80A CPU
U1 18:12
AY-3-8912
U54 18:25
3d files for the PLUS case feet
www.thingivers...
www.myminifact...
www.bytedeligh...
Music is from Audio Library on KZbin and is the
Dance and Electronics playlist
www.youtube.co....
Spectrum loading screen by @SpectrumNez

[@DJlegionuk]

If you like the retro repairs I have a 2nd channel just for them. kzbin.info

[@larky3]

you took the time to blur out your address on the parcel, but your postcode is also on the postage label.

[@limamarcos777]

Thanks for the detailed step by step instructions, helped me aa lot. Nothing better than turning it on after si much labour and to realize that it works!!!!

[@ghenghiskhan9473]

my harequin 48k is not registering the key presses. Sometimes it double registers a character when it works. Any ideas if it's a logic IC. Do you know which specific ICs relate to keyboard membrane and registers? I didn't make this harlequin my self and got it when I purchased a lot of ZX gear. I would like to her it working as the picture is just sharp on the ZX Harlequin. Your advice would be appreciated. Thx

[@DJlegionuk]

sorry I just built the kit and have no idea how it works.

[@marksmith-qd8vg]

hi great video helped me a lot. one problem maybe you could help. everything working fine apart from keys asdfg. tried a couple of different membranes same result. any idea?

[@DJlegionuk]

sorry I just made the kit and don't know how it works.

[@keith1200RetroComputers]

Which way do the 2SA1175 transistors go in? I'm building one atm, but stuck at the 2SA1175s.

[@DJlegionuk]

watch the video when I put them in kzbin.info/www/bejne/b4a0koahhJmnmtU

[@keith1200RetroComputers]

@@DJlegionuk Brilliant. Many thanks 😁