UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

TonyDuell · 25th Jul 2022, 4:42 am

The W1 jumper I mentione is a wire link (probably a 0 ohm resistor) alongside the 8088 CPU on the motherboard. It should be easy to see if it's cut. My guess s that it is not, the machine can't work without the copro board if it is.

I'll have to find the service manual (as opposed to the technical manual) to look up the error codes. The touchscreen is an HP-HIL device. the same interface is used for the keyboard. Does the keyboard work? If not, get worried, the HP-HIL system uses an HP custom interface chip and a programmed 8042 microcontroller.

The touchscreen upgrade consists of a new bezel containing the touchscreen electronics. As you probably know it was an array of IR LEDs and sensors, by detecting which beams were broken it worked out where your finger was. It plugs into a socket on the CRT mounting, that's the ribbon cable you've found. The same touchscreen fits a couple of HP video monitors too.

25th Jul 2022, 4:42 am	#18
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,215	Re: HP 150 Touchscreen II repair The W1 jumper I mentione is a wire link (probably a 0 ohm resistor) alongside the 8088 CPU on the motherboard. It should be easy to see if it's cut. My guess s that it is not, the machine can't work without the copro board if it is. I'll have to find the service manual (as opposed to the technical manual) to look up the error codes. The touchscreen is an HP-HIL device. the same interface is used for the keyboard. Does the keyboard work? If not, get worried, the HP-HIL system uses an HP custom interface chip and a programmed 8042 microcontroller. The touchscreen upgrade consists of a new bezel containing the touchscreen electronics. As you probably know it was an array of IR LEDs and sensors, by detecting which beams were broken it worked out where your finger was. It plugs into a socket on the CRT mounting, that's the ribbon cable you've found. The same touchscreen fits a couple of HP video monitors too.