Radio Shack TRS-80 III Manual de usuario

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TRS-80 MODEL III

MODIFICATION KIT

FIRST INTERNAL DISK DRIVE

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CATALOG NUMBER 26-1162

CUSTOM MANUFACTURED IN U.S.A. BY RADIO SHACKM ADIVISION OF TANDY CORPORATION

PARTS LIST

Description Quantity

Manufacturer's

Part Number Radio Shack

Part Number

Cable, Disk Ground

Cable, Disk I/O

Cable, 20 pos,45", FF

Cable,8pos, 8.5", FFC

Clip, RICHCO, LCBS-4R

Disk Drive

Fastex, 16402 -04

FDC Board

Mounting Bracket (left)

Mounting Bracket (right)

Power Harness, Disk DC

Power Supply

RF Shielding

Screw, #6 32 x1/2", PH

Screw, #6 x3/8", plasrite

Screw, #8- 32 x1/2", PH

Tab, Ground, PS Conn.

Washer, #8, flat

8709166

8709154

8459020

8459108

8559018

8790112

8559020

8858029

B71910S

8719105

8709183

8790021

8729041

8569039

8569047

8563078

8529019

8589017

8589016

AW2533

AW2535

AW2631

AW2632

AHC0071

AXX5019

AHC0073

AXX0510

ART3083

ART3086

AXX6005

ART3085

AH01 546

AHD1552

AHD2307

AHC0325

AHD8514

AHD8513

DISASSEMBLY

1. Remove all cables from the bottom and rear of the

Computer and position the Computer on its rear panel.

Remove the ten screws from the case bottom. Hold the

case together as you take out the last few screws.

2. Position the Computer upright and remove the #6 screw

and washer from the top of the back panel of the Case.

3. Carefully remove the Case Top, lifting straight up and

off to the left (if facing the video screen). Disconnect

all cables connecting the video assembly to the com-

puter and set the Case Top aside.

4. Remove all cables connecting the CPU Board (main DC

power harness, CRT wiring harness, keyboard and cassette

cables, and RS-232 inter-connect cable if used).

5. Remove the five screws fastening the CPU Board (two in

"upper right corner, three on bottom). Remove the small

Board Mount Support Bracket and its two screws from

atop the metal chassis bracket.

6. Make sure all cables to the CPU Board have been dis-

connected. To remove PC Board, press the small tabs on

the plastic spacer mounts (RICHCO clips) through the

mounting holes in the PCB and gently pull the CPU

Board off.

PROCEDURE

1. Install the two RICHCO clips (plastic spacer mounts) and

the two Fastex clips in their positions on the left-hand

side of the metal chassis bracket. See Figure 1

2. Install the FDC Board (with J4 upward) onto the plastic

RICHO clips and fasten the bottom part of the Board

using two #6 x3/8" screws.

3. Attach the appropriate connector of the Disk DC Power

Harness (see Figure 2) to J3 on the FDC Board.

Note that two of the connectors on one end of the

Disk I/O cable has some pins missing and the connector

on the other end of the cable has all its pins in place.

Connect the end with all pins in place to J4 of the FDC

Board so that the cable is coming out away from the

metal chassis bracket.

Connect one end of the 45", 20 position FFC cable to

J2 on the FDC Board.

Make sure that all unconnected ends of the cablet are

placed over the metal chassis bracket. Replace the CPU

Board onto the plastic spacer mounts (RICHCO clips)

and fasten the bottom part of the Board and upper right

corner using five #6 x1/4" screws.

FIGURE 1. RICHCO AND FASTEX CLIP POSITIONING

TO fDC B0A8S

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FIGURE 2. DISK DC POWER HARNESS

7. Connect on« end of the 8S", eight position FFC cable to

JP1 Aon the CPU Board. Bend the cable so as to make it

flat (see Figure 3) and connect the other end to JP1 B.

the Disk Brackets. Don't forget to connect the R&232

inter-connect cable if used, or the FDC inter-connect

cable which connects to J7 on the CPU Board.

8. Reconnect cables to the CPU Board (main DC power

harness, CRT wiring harness, and cassette cables). Do not

connect the keyboard cables at this time. Lay it beside the

computer case so it will not be in the way when mounting

9. Attach the small Board Support Bracket to the metal

chassis bracket with two #6 x1/4" screws.

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FIGURE 3. EIGHT POSITION CABLE BETWEEN JP1A AND JP1B

10. Now find the left Disk Mounting Bracket (the taller of the

two brackets) and install the RF shield around the Bracket

as shown in Figure 4. Bend the tabs around the rear of the

Bracket to hold the shield in place.

11. Attach the Disk Mounting Brackets to the Case Bottom

»(stubby rests positioned inward) using four #8 flat washers

(two for each bracket).

12. Position the Keyboard cable between the two brackets

and connect it to the CPU Board.

FIGURE 4. LEFT DISK BRACKET

WITH SHIELD

13. Attach the large connector of the Disk DC Power Harness

to J2 on the Disk Drive PC Board

14. Find the Disk Ground Cable and notice that one end has

two connectors close together. This is the Disk Drive end.

Connect the end connector on the Disk Drive end to the

grounding tab on the disk drive chassis. Attach the other

end of the ground cable to the main ground tab to the left

on the metal chassis bracket.

15. Attach the bottom connector of the Disk I/O cable to

the Disk Drive PC Board (J1). The other connector will

remain unattached.

16. Position the Disk Drive in the bottom position between

the Mounting Brackets and fasten the Drive using four

#8 x1/2" screws and four #8 flat washers. Be careful

not to tighten the screws too tight. Refer to Figure 5.

17. Position the Disk Power Supply (with power connectors

SK-2, 3, and 4positioned upward) on the left Disk

Mounting Bracket. Fasten using four #6 x1/2" screws and

four #6 washers. Refer to Figure 5.

NOTE: The ground lug must be installed underneath the

Board when the screw is intalled in the lower right-hand

position (at the ground symbol).

18. Attach the two connectors of the Disk DC Power Harness

to SK2 and SK3 on the Power Supply Board.

19. Connect the middle connector of the Disk Ground Cable

to the ground tab on the lower right of the Power Supply.

20. Connect the unattached connector of the AC Power

Harness to SK1 on the Power Supply Board.

FIGURE 5. DISK DRIVE AND DISK POWER SUPPLY

IN POSITION

Use apair of large dykes to cut the bottom position insert

in the Case Top as illustrated in Figure 6~ After the insert

is cut loose, remove it by pushing on it from outside of

the case. Trim off the rough edges around the opening.

22. Check back over your work and see that all cables are

properly connected. Reconnect the video unit and power

up the Computer. Check the unit's operation. After

unit is proved working correctly, turn power switch off

and disconnect the AC line cord.

23. Carefully place the Case Top over the Case Bottom.

Do not hit the CRT neck. It could implode or break off.

Install the #8 screw and flat washer in the top of the rear

panel of the Case Top.

24. Carefully rest the Computer on its rear panel and replace

'. the five 1" sheet metal screws twoard the rear, three 7/8"

!machine screws along the front, and two 1" machine

screws in the remaining positions.

25. Don't forget to put on the authorized Radio Shack seal

to maintain the warranty.

CUT THIS INSERT WHERE

INDICATED

CASE TOP

FIGURE 6CASE BEZEL (shown looking inside Case with Cass Top upside down)

RADIO SHACK MADIVISION OF TANDY CORPORATION

,U.S.A.: FORT WORTH, TEXAS76102

CANADA: BARRIE, ONTARIO L4M 4W5

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—

TANDY CORPORATION

AUSTRALIA 'BELGIUM U. K.

230-316 VICTORIA ROAD PARC INOUSTRIEL OE NANINNE 8ILST0N R0A0 WEONESBURY

RYOALMERE. NSW 2116 §140 NANINNE WEST MiOLANOS WS10 7JN

12/80 PRINTED IN U.S.A.

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