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SECTION 3 CONSTRUCTION

[ ] Install the 7805 regulator at U2 (3A-4A) using the

heat sink and the #6 hardware. Use the needle-nose

pliers to bend the 7805 leads before mounting it.

Mount the regulator on the heat sink first, then

solder.

[ ] Install the 2N2907A transistors at U5 (2K-2L) and U8

(U1). Use two TO-18 spacers at this time.

[ ] Install the 2N2222A transistor at U7 (U1). Use a TO-

18 spacer when mounting.

[ ] Install the 79L12 regulator at U6 (4B). Align part as

shown in silkscreen.

[ ] Install the 8.000 Mhz xtal at Y1 (3L).

[ ] Install switch at S1 (3F-3H).

[ ] Insert the DOUBLE D controller card into an S100

mainframe. Turn on the power switch an check the

following voltages.

[ ] U2 has +5 volt output.

[ ] U1 has +12 volt output.

[ ] U6 has -12 volt output.

[ ] THE FOLLOWING STEPS ARE FOR 8" DRIVES.

ECN#2 [ ] Install a

10k resistor (Brown-Black-Orange) at

R1 (1A).

ECN#2 [ ] Install a

18k resistor (Brown-Grey-Orange) at R3

(1A).

ECN#2 [ ] Install a

15k resistor (Brown-Green-Orange) at

R4 (1A).

[ ] Install a 6.2K resistor (Blue-Red-Red) at R6

(OL).

[ ] Install a jumper wire from "CLK" to "8" in the

CLOCK SELECT BLOCK near ICs 2L-2M.

THE FOLLOWING STEPS ARE FOR 5" DRIVES.

[ ] Install a 24K resistor (Red-Yellow-Orange) at R1

(1A).

[ ] Install a 39K resistor (Orange-White-Orange) at

R3 (1A).

[ ] Install a 36K resistor (Orange-Blue-Orange) at

R4 (1A).

[ ] Install an 8.2K resistor (Grey-Red-Orange) at R6

(OL).

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 46 47

Double D 1
. ERRATIC DISK OPERATION 4

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