Qume DataTrak 8 Manual descargar pdf (Pagina 29)

SECTION 3 CONSTRUCTION

[ ] Install 18-pin sockets at 4C, 4DL, 4DR, and 4E. Do

not solder yet.

[ ] Install 20-pin sockets at 1F, 1H, 3K, 3L, 4F, 4H,

4J, 4K, 4L, and 4M. Do not solder yet.

[ ] Install 40-pin sockets at 1J and 2D. Do not solder

yet.

[ ] Place the flat styrofoam cover you received with your

kit box firmly against the component side of the

board. Turn the board over, holding the flat

styrofoam piece tightly against the board. Press the

board down, forcing the sockets into the styrofoam.

Now solder the alternating corner pins of the IC

sockets to hold them in place temporarily (pins 8 and

16 on a 16-pin socket, for instance).

[ ] Turn the board over and very carefully inspect it to

determine that all the IC sockets are down flat

against the board. If you find any that are not down

flat, melt the solder joints of the IC socket while

pressing it down against the board.

[ ] Now that all IC sockets are down firmly on the board,

turn the board solder side up. Make sure all IC

socket pins are sticking through the holes. IC

sockets are very hard to remove after they are

completely soldered in. Remove any socket not

installed properly, straighten the pin and re-insert.

[ ] Solder all IC pins.

NOTE: For the following steps the closest IC socket

location for each part will be enclosed [IC#].

[ ] Solder in the 1N748-750 diode at CR1 (4M).

Install nine 1N270 diodes at the following locations:

[ ] CR2 (2L) [ ] CR5 (U4) [ ] CR6 (U4)

[ ] CR7 (1A) [ ] CR8 (1A) [ ] CR9 (U4)

[ ] CR10 (U4) [ ] CR22 (U4) [ ] CR23 (2B)

[ ] Install fourteen 1N914B diodes at the following

locations:

[ ] CR3 (U4) [ ] CR4 (U4) [ ] CR11 (U4)

[ ] CR12 (2B) [ ] CR13 (1B) [ ] CR14 (U4)

[ ] CR15 (U4) [ ] CR16 (2B) [ ] CR17 (2B)

[ ] CR18 (3M) [ ] CR19 (1D) [ ] CR20 (4L)

[ ] CR21 (1B) [ ] CR24 (1D)

ECN#2 R1:6k8 (see note), R3:12k, R4:10k, R38:20k

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 46 47

Double D 1
. ERRATIC DISK OPERATION 4

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Qume DataTrak 8 Manual Pagina 29

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