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HAWK-800 Constructions and Installations Instructions –
IC22 Socket
IC22 socket between pins 1, 26, 27 and 28 should show a short.
IC22 socket pin 28 should show a short to Vcc on IC24 pin 40).
IC22 socket pin 14 should show a short to Ground on IC24 pin 20.
There should NOT be shorts between any of the other IC22 socket pins 2 to 13 and 15 to 25. Your ohm-meter might show
some resistance between those pins but the meter should NOT show a zero ohms short between any of them. It is most
important to check that neighboring pins are not shorted since neighboring pins are most likely to become an electrical
short due to a solder bridge being formed when the socket was installed and soldered in. Work your way from pin 2 all the
way down to pin 13, moving your probes from each pair of neighboring pins to the next always looking for a zero ohm
short. Then work your way back up from pin 15 all the way up to 25 in the same manner.
IC22 socket pin 2 should show a short to IC24 pin 25.
IC22 socket pin 23 should show a short to IC24 pin 24.
IC22 socket pin 21 should show a short to IC24 pin 23.
IC22 socket pin 24 should show a short to IC24 pin 22.
IC22 socket pin 25 should show a short to IC24 pin 21.
IC22 socket pin 10 should show a short to IC23 pin 2.
IC22 socket pin 9 should show a short to IC23 pin 19.
IC22 socket pin 8 should show a short to IC23 pin 5.
IC22 socket pin 7 should show a short to IC23 pin 16.
IC22 socket pin 6 should show a short to IC23 pin 6.
IC22 socket pin 5 should show a short to IC23 pin 15.
IC22 socket pin 4 should show a short to IC23 pin 9.
IC22 socket pin 3 should show a short to IC23 pin 12.
IC22 socket pin 11 should show a short to IC24 pin 12.
IC22 socket pin 12 should show a short to IC24 pin 13.
IC22 socket pin 13 should show a short to IC24 pin 14.
IC22 socket pin 15 should show a short to IC24 pin 15.
IC22 socket pin 16 should show a short to IC24 pin 16.
IC22 socket pin 17 should show a short to IC24 pin 17.
IC22 socket pin 18 should show a short to IC24 pin 18.
IC22 socket pin 19 should show a short to IC24 pin 19.
Still No Good?
If you still do not see flashing 88 88 88 when you power on your synth then contact
assistance.
ROM chip positions
The picture below shows the four 28 pin chip locations marked A through D.
A – is the boot ROM. The boot ROM may be delivered in the kit with a label on the front or is marked in black
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marker on the back of the chip with the letter "B" (indicating boot ROM). This is a 28C256 32Kx8 EEPROM.
B – is the software ROM. Three software image files must be sent ("flashed") to the HAWK-800 in order to fill the
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software flash ROM with the required software. This is a 28C256 32Kx8 EEPROM
C – is the patch data storage ROM. This is a 28C256 32Kx8 EEPROM
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D – is the random access memory (RAM) chip that stores temporary data used for proper synthesizer operation.
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This is a 6264 type (or equivalent) 8K x 8 static RAM.
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