Harman Kardon SIGNATURE 2.0, Service Manual

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Signature 2.0 Upgrade Procedure
WARNING: Please use caution during the removal of the DTS board and EEPROM IC305 from their
protective packages, and during installation. ESD protection is required to assure the parts are not
damaged.
PART I REPLACEMENT OF EEPROM IC305
1. Turn the unit off with the Master Power Switch (on/off button on front panel) and unplug it from the AC
power source; remove any input and output cables.
2. Remove all (10) screws holding the cover on; there are two on the right and left sides, three at the rear, and
three at the top near the front of the unit.
3. Remove the top cover by gently lifting it up slightly from the rear, and then pulling it back away from the unit.
4. Remove the two plated screws to the left and right of the S-Video jacks on the rear panel.
5. Remove the two black screws that are between the yellow video jacks.
6. Inside the unit, the video board is secured at the rear by a metal nut attached to a white plastic post on the
corner of the board. Remove this nut.
7. Lift the video board up slightly, and pull it into the unit. Turn the board upside down and rest it carefully inside
the unit. It is not necessary to unplug any additional connectors.
8. Locate the large EEPROM chip (IC305) on the CPU board that is now visible. The IC is in the center of the
board and has a label with the word “Signature” and a revision number. Note there is a notch in the front
edge.
9. Using an IC Chip Removal & Installation tool (Radio Shack model #276-2101 or equivalent), carefully remove
the IC by gently rocking it from side to side and then pulling straight up.
10. Remove the new EEPROM from the upgrade kit and place it in the socket. When inserting the chip, make
certain that the notched end is facing forward, toward the front of the unit ). An outline of the chip with the
notch in the proper position is screened on the board). The new EEPROM will be labeled “2.10a”.
IMPORTANT NOTE: When inserting the new chip, take extra care to ensure all pins are seated in their
respective holes, and they are not bent or damaged before the IC is seated. If needed, use a small flat-blade
screwdriver to gently align the pins into the socket holes.
11. When all the pins are lined up, gently push down on the chip so that it seats firmly in the socket.
12. Replace the video board, pushing the RCA jacks back through the holes in the rear of the chassis and
reseating the hole in the back corner of the board on the plastic support post; replace the nut.
13. Replace the two plated screws and the two black screws that secure the video board to the chassis.
PART II REPLACEMENT OF DSP AUDIO BOARD
14. Remove the plated screw to the right of the optical input jacks (near terminal #6) on the rear panel.
15. Remove the two black screws that are above the digital audio input jacks (#1- 4)
16. Pull the DSP board into the unit, free from the back panel. Remove the white plug at the rear of the board;
then remove the ribbon connectors at either side of the DSP board by gently rocking the connector from side
to side, while carefully pulling each connector upwards.
17. Remove the new DSP board from the upgrade kit. (New DSP boards are » 5 ½” in length; original DSP board
is much shorter). Replace the three connectors; slide the white connector into the header socket on the rear
of the new board. Replace two ribbon connectors back in their sockets on either side of the board. The side of
the ribbon cable with the red line should face towards the front of the unit. Position each connector over the
socket and press into position.
18. Put the new DSP board back into position through the holes in the rear panel.
19. Replace the two black screws above the RCA jacks and the single plated screw.
20. Replace the unit’s cover and (10) screws.
21. Make certain the front panel Master Power On/Off Switch is in the “Off” position; it should extend out
beyond the front panel.
22. To test: Before turning the unit On, it is important that the unit be reset. To reset, first hold in the two outer
buttons on the front panel Source and Mute , then press the Master Power On/Off Switch to the “On”
position; then release the Source and Mute buttons. The front-panel display should now read “Signature
2.0” and “Initialized.” The unit has been reset and is ready for operation.
23. Attach a colored label to the bottom of the unit, and on the outer carton (if available), stating “ DTS upgrade ”.
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Signature 2.0 Processor/Tuner harman/kardon