+2 Grey versions

This thread is an attempt to pin down the various hardware revisions of the +2 Grey. If anybody can provide further images from their machines or further information I'll incorporate it into this post

So far I've looked at both the +2's I have, the discussions on the forums and some google searches to see what I can find. There seem to be three main revisions of the PCB, within these there appear to be separate date coded batches

Z70500
Comments: Presumably the earliest versions of this board were created prior to the Sinclair takeover
Place of manufacture: These boards appear to have been manufactured in Taiwan, this is embossed on the underside of the case.
Date of manufacture (batch): The date code for the PCB batch is recorded on the top right corner on the rear of the PCB in the traces, in this case 32nd Week of 1986:
Screenshot%202015-09-03%2009.17.16.png

Distinguishing features: Fitted with radial capacitors, 2 bodge resistors and a capacitor on the rear of the PCB.

Problems:
Requires TR4 mod for misplaced transistor.

Variants:
Standard 8632 (1986 Week 32)/ 8642 (1986 week 42): Schematic Schematic
Mid (1987? Week 21): ROM has text rotated on it, date code 8721 plus2_pcb.jpg(image nvg)

Serial numbers:
A six digit number proceeded by a U
U-102726: 8632

Photos
8632

Z70700
Comments: Manufactured in the UK once stocks of the toast rack PCB were used up?
Place of manufacture: These boards appear to have been manufactured in UK, this is embossed on the underside of the case.
Date of manufacture (batch): The date code for the PCB batch is recorded on the bottom left corner on the PCB in the silkscreen

Distinguishing features: Fitted with axial capacitors (excess stock left over from the toast rack?). Lots of small coloured stickers on the modulator and elsewhere in the case.

Variants:
3886 (1986 Week 38): Bodge resistor on bottom left hand corner of the board (R86?)
8640 (1986 Week 40): Colour of capacitors change 20130605_153957.jpg (Ben Verstee)
8645 (1986 Week 45): Colour of capacitors change, different diodes, changes to resistors in bottom left corner of the board. +2_inside.jpg (Tom Dalby)

Serial numbers:
A six digit number followed by a T, e.g.:
003290:
005711T: (3886)
012703T: (8645?)
081526:

Photos
8686
8640

0500 (Z70500 is on the rear side)
Comments: A later varient of the Z70500 (see also) possibly originally for the French market, but UK versions also exist.
Place of manufacture: Taiwan (embossed on bottom of case and PSU sticker).
Date of manufacture (batch): ? 8641A listed on the front bottom silkscreen of later revisions

Distinguishing features: Encased inductor, capacitor colour change, rear-side bodges of Z70500 corrected and paced on the front. Fixed HAL chip.

Variants:
UK (1986 Week 37): +2_inside_i3.jpg (Tom Dalby)
UK 8641A (1986 week 41): Amstrad 4056 instead of PCF1306P img_2278.jpg (nightfall crew)
France (1986): The modulator and associated components are not fitted, French ROM (40068)F_cmspectrumplus2.jpg (moo5)

Serial numbers:
A six digit number proceeded by a U
U205749: 8641A http://www.nightfallcrew.com/22/08/2009/sinclair-amstrad-zx-spectrum-2-in-the-grey-case-issue-3sinclair-amstrad-zx-spectrum-2-grigio-issue-3/

Photos
Nightfall crew

Comments

  • edited September 2015
    I've got a +2 Grey with an 8639 motherboard. Currently taking photos.
    Made in Taiwan, UK issue.
    If you need them uploading then please let me know.
    Post edited by MatGubbins on
    I am from that generation, when Pluto was still a planet, and the Earth is round.

    Bomb Munchies on WOS thread
    Bomb Munchies Ver1930 17th Nov 2017 (look for the blue download box ) If you get a time-out message and live in the UK then try after 9pm-3am.
    Send me a PM and I can email it to you too. Kent, UK
  • edited September 2015
    Spectrum 128+2 Grey Z70500 8639 motherboard

    Plus2-Z70500-8639date_zpsclxsyxzf.jpg
    Plus2-Z70500-8639top_zpsjzr5fjnv.jpg
    Plus2-Z70500-8639under_zpsr8c1qjuc.jpg
    Note: The dodgy soldering around the keyboard connectors is my doing - around 1990/91 I removed them when the great idea of just having the keyboard on my lap and leaving the rest of the plus2 on the desk, connected via a long strip of ribbon cable and housed in the base of a very dead Spectrum+ case - it worked! I've returned everything back to normal now.
    Plus2-Z70500-8639modulator_zpsdqnbrb6t.jpg

    Serial: U-091998 (white sticker)
    Made In Taiwan
    The dust is an optional extra
    Post edited by MatGubbins on
    I am from that generation, when Pluto was still a planet, and the Earth is round.

    Bomb Munchies on WOS thread
    Bomb Munchies Ver1930 17th Nov 2017 (look for the blue download box ) If you get a time-out message and live in the UK then try after 9pm-3am.
    Send me a PM and I can email it to you too. Kent, UK
  • I've added this info to the wiki: http://faqwiki.zxnet.co.uk/wiki/ZX_Spectrum_+2
  • edited September 2015
    A note for your wiki:

    Not only TR4 has to be rotated but also TR7. If TR7 is mounted in the false direction then the transistor, which normally acts as an emitter follower, only acts as a diode. The base-collector-diode together with R65 realizes the OR function. But in this case A0 is loaded by 470 Ohm which would be avoided if TR7 would be mounted correct.

    Greets Ingo.
    Post edited by ingo on
  • Thanks Ingo, I've updated it

  • Spectrum 128+2 Grey Z70500 8640 motherboard
    P2-8640f_zpsqohnvywb.jpg
    p2-8640b_zpsgqfji1oc.jpg

    Serial: U-132350 (white sticker)
    Made In Taiwan

    - please feel free to upload these photos and the photos of the 8639 in my previous post to the wiki site if they are needed for reference -
    If you need more photos then please ask soon as I will be fixing the composite and sound issues in the next few weeks.

    I am from that generation, when Pluto was still a planet, and the Earth is round.

    Bomb Munchies on WOS thread
    Bomb Munchies Ver1930 17th Nov 2017 (look for the blue download box ) If you get a time-out message and live in the UK then try after 9pm-3am.
    Send me a PM and I can email it to you too. Kent, UK
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