Here it is:
HYS 8: 10 MHz to 20 MHz Upgrade
Author: Dieter Wächter <waechter.dieter@...>
This document describes how to do the frequency- doubling of the Z 80- processor at the GSP 2101.
You need the following parts:
· 1 crystal, 20 MHz in HC-18 housing
· 2 ceramic- capacitors 15 pF, Voltage: doesnt matter, structural module: 2.5mm
· 2 small cable- straps
You'll get all parts in every electronic- shop.
Notes:
· Observe all the electric specifications! (Risk of electric shock ....)
· Take care of the rules for static protection. If you dont know them, youll find them at: · <;http://home.sprynet.com/~clpastor/gfaq-7.html > Upgrade- Process: Store a Bulk- Dump. (This is not absolute necessary, but only for safety) Pull all plugs out of the GSP. Remove the six side-panel screws Remove the rear-panel top center screw Remove the front-panel top center hex- bolt Remove the lid Press on the cable- holder on the mainboard which holds the pins of the cable of the output-potentiometer and pull on the cable. The cable must slip out of the cable holder. Hey man... be careful dont damage the cable-holder or tear the cable apart! It must slip very facile out of the holder! Pull the plug from the front-panel-board, which is connected to the mainboard (the lower plug of the ribbon cable) Remove the 5 front-panel hex- bolts Remove the complete frontpanel. Pull off the knob of the cabinet- emulator- switch Remove the 4 XLR-connector screws Remove the 4 XLR-connector- board screws Pull the XLR-connector- board Remove the valve- holder- screw Mark the valves with V1 and V2 with a pen. Pull the valves Remove the hexagon- valve- holder- standoff Cut the two cable- straps which hold the cables from the secondary side of the power- transformer. Pull the two power- transformer- plugs. Remove the 2 lower screws of the heat sink Remove the 7 phone-plug-plastic-nuts Remove the 4 DIN-plug screws (there are different versions! At the older 2101s there are no screws!) Remove all the screws which hold the mainboard (Also different versions... you have to look!) Uncase the mainboard. Locate the 10 MHz- crystal (X2). You find it between the Z80- processor and the battery. Locate the capacitors C 233 and C 234. You find it right beneath the crystal. There is a writing "25" on them. Unsolder the crystal. Its a double- sided board, so dont use a unsoldering- pump, use a forceps, heat the pins and pull it out of the vias. Unsolder C 233. Same process Unsolder C 234. Same process Now suck the rest of the plumber's solder out of the vias. Use a unsoldering- pump to do this. Solder the 20 MHz- crystal to the board at the same position where the 10 MHz- crystal was. Be careful, dont cause soldering- bridges! Solder the two 15 pF- capacitors to the board at the same position where C 233 and C 234 was. Same process. Make sure that there are no soldering- bridges. Mount the main board. Mount the 4 DIN-plug screws Mount the 7 phone-plug-plastic-nuts Mount the 2 lower screws of the heat sink Mount the two power- transformer- plugs Fix the cables of the transformer with the two cable- straps Mount the hexagon- valve- holder- standoff Mount the valves. V1 where V1 was, V2 where V2 was. Mount the valve- holder Mount the XLR-connector- board Mount the knob of the cabinet- emulator- switch Mount the frontpanel Mount the ribbon cable- plug from the front-panel-board Put the ribbon cable from the output-potentiometer back into the cable- holder Check if everything is on the right position. Mount the lid Switch on the GSP 2101 an watch the display. The Software- version is shown some seconds later. An "a" appears after the software- version. (e.g. 3.00.00.a if you had an 3.00.00 past) Congratulations! Now you are frequency- doubled. Send questions to: waechter.dieter@...
Here's where this came from
http://groups.yahoo.com/group/gsp-users/message/8391
At 04:06 AM 11/17/2004 +0000, you wrote:
Hi,
I was wondering,can you change the crystal and make the 2101
faster?I bet there's more to it than that but whado I know?:)
Thanks for reading!
Paul
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