Repair notes | ZX Spectrum

Moving vertical stripes, blue border

Possible cause: Broken ROM chip

Fix:

• Burned a new ROM using this dump: ZXS48.ROM (used for 16k and 48k spectrum).
• Used a 27C512 as replacement ROM and connected the pins for A15 and A14 to ground and connected /ROM_CS and /MREQ with a diode to EPROM pin 20 and with a 10k resistor to ground. See: http://blog.retroleum.co.uk/electronics-articles/how-to-replace-the-rom-of-a-zx-spectrum-with-an-eprom/.

Black screen with red vertical stripes, gray border

Possible cause: Broken ROM chip

Fix:

• Burned a new ROM using this dump: ZXS48.ROM (used for 16k and 48k spectrum).
• Used a 27C512 as replacement ROM and connected the pins for A15 and A14 to ground and connected /ROM_CS and /MREQ with a diode to EPROM pin 20 and with a 10k resistor to ground. See: http://blog.retroleum.co.uk/electronics-articles/how-to-replace-the-rom-of-a-zx-spectrum-with-an-eprom/.