ENSONIQ ASR-10 Manuel de service télécharger pdf (Page 55)

Replacinn ASR-I

O/88

Modules

Make sure that the insulation completely covers and slightly overhands the

mounting tab.

If disconnecting the 20-pin ribbon cable from J4 on the analog board doesn’t fix the

problem, there is a problem with the tape insulation on an analog board mounting

location.

Remove the analog board as described in Section B.

Make sure that the tape insulation completely covers, and slightly overhangs, the

analog board mounting locations.

Replace the boards as described in Sections B and G.

Verify that the resistance across R14 is between 1900% and 2100%.

12. Place the bottom plate on, but don’t install any screws yet.

13. Turn the unit right side up. Turn it on and watch the display.

14. Verify that the display shows ENSONIQ ASR-10, then SCSI INSTALLED, then

SEARCHING FOR SCSI DEVICE.

15. Turn the unit off and turn it upside down and replace

allthe

screws on the bottom plate

and rear panel (use no more than

Mbs

of torque

SECTION

Replacing the Digital

I/O

Option Board

Removing

Remove all cables connected to the ASR- 10, including the power cord.

Turn the unit upside down on a soft surface and remove all the screws from the base and

rear panel. Note that you will have at least two different types of screws. Remove the

bottom cover.

Make sure. that the EPROMs are version 1 SOB or higher. The two Operating System

EPROMs, LOWER

(U19)

and UPPER

(U22),

are located in the center of the digital

board (409001700X) near the OTTO chip.

With the jacks closest to you, find the four (4) holes in the keyboard bracket to the left of

the digital board. The disk drive ribbon cable runs through this area and it is the area

behind the SCSI board (see Figure 20).

NOTE: On some units one of the two disk drive ribbon cable clamps may have been put on the

keyboard bracket in this DI-10 mounting area. If the unit you are working on is like this, the

ribbon cable clamp must be removed. A screwdriver will do the job, as the cable clamp is

attached with double-sided foam tape. There is no need to replace the ribbon cable clamp.

The DI-10 board will mount on top of the disk drive ribbon cable and hold it in place.

Place the DI-10 board assembly over the holes in the position shown in Figure 20. Snap

the DI-10 board standoffs into the keyboard bracket. Make sure that the plastic standoffs

are fully seated in the holes.

ASR Service Manual

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ENSONIQ ASR-10 Manuel de service Page 55

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Produits connexes et manuels pour Pianos numériques ENSONIQ ASR-10