SAMS_Computerfacts_(CD12)_1571.pdf

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SAMS.
TECHNICAL SERVICE DATA
COMMODORE®
Model 1571
disk drive
FEATURES:
COMPLETE SCHEMATICS
•
PRELIMINARY
SERVICE CHECKS
•
TROUBLESHOOTING TIPS
EASY-READ
WAVEFORMS
•
REPLACEMENT
PARTS
LISTS
•
SEMICONDUCTOR
CROSS-REFERENCE
SAMS
COMPUTERFACTS"
PRELIMINARY SERVICE CHECKS
This data provides the user with a time-saving service tool
which is designed for quick isolation and repair of Disk
Drive malfunctions.
Check all interconnecting cables for good connection and
correct hook-up before making service checks.
Alv/ays turn the Disk Drive off before connecting or discon
necting connectors or boards.
COMMODORE
MODEL 1571
Disconnect
all
external
peripherals
from
Disk
Drive
to
eliminate possible external malfunctions.
LU
SE
O
Q
Replacement or repair of the Power Supply, Disk
tion has been isolated.
Drive
Board or Connectors may be necessary after the malfunc
O
TEST EQUIPMENT AND TOOLS
TEST EQUIPMENT
CM
5
Digital Volt/Ohm Meter
Logic Probe
Frequency Counter
O
Disk Drive Tester or Test Program
TOOLS
Head Cleaning Equipment
Contact and Switch Cleaner (non spray type)
Phillips Screwdriver
Flat Blade Screwdriver
IC Insertion and Removal Tools 20. 24 and 40 pin 14. 16
Low Wattage Soldering Iron
Desoldenng Equipmenl
REPLACEMENT PARTS
Item
F101
Description
Fuse 2A
M1
Y1
Head Position Motor
16MHz Oscillator Module
The tisimg of any available replacement pan nerein does not
constitute in any case a recommendation, warranty or guaranty
SAMS,
Howard W. Sams & Co.
4300 West 62nd Street, P.O. Box 7092, Indianapolis, Indiana 46206 U.S.A.
Reproduction or use, without express permission, of editorial or pic
torial content, in any manner, is prohibited.
No patent liability is
by Howard W Sams & Co. as to !he Quality and suitability ol
such replacement part
The numbers ol these parts have been
assumed with respect to the use ot the information contained herein.
compiled tioni information furnished 10 Howard W. Sams & Co.
Dy the manufacturers of the particular type of replacement par!
® 1987 Howard W. Sams & Co.
4300 West 62nd Street. P.O
Bo* 7092, Indianapolis. Indiana 46206
"8i«J.
86CD14986
DATE 1-87
U.S.A.
Printed in U.S. ol America
PRELIMINARY SERVICE CHECKS (Continued)
MOTOR CONTROL
BOARD
(BOTTOM OF DRIVE)
_aXv SPEED
VR1
x
SPINDLE
ADJUST
TO CN2-
10.9
TRACK 00
SENSOR
10.6 r
11.0 •
o
PINS 8,9,10"
TO CN4
■a
CN2
/16MHz
INDEX
SENSOR
HEAD POSITION
MOTOR
WRITE
PROTECT
SENSOR
us
Y1
TO CN5-
TO CN7-
MAIN BOARD
16MHz
6a)
TO CN4a
PINS 4,5
PINS 1,2"
TO CN4
®®
CN5
1
3
I (s
CN7
1
CN3
•
RED LED POWER
GREEN LED POWER
m)
CN1
X
VR201
5V ADJUST
10
CN4
U ?2V
POWER SUPPLY
BOARD
F101
2A
INTERCONNECTING DIAGRAM
INTERCONNECTING DIAGRAM
PRELIMINARY SERVICE CHECKS (Continued)
SERVICE CHECKS
MATCH THE NUMBERS ON THE INTERCONNECTING DIAGRAM AND PHOTOS WITH
THE NUMBERS ON THE SERVICE CHECKS TO BE PERFORMED.
©
DISK DRIVE DEAD
(A)
Check Fuse F101.
If Fuse is bad, replace or
(B)
Check for 12V at pin 2 of Connector CN7. If 12V
is missing refer to "Power Supply" section.
troubleshoot Power Supply.
(C)
If 12V is presen! at Connector CN7, connect a
jumper from pin 3 of Connector CN7 to ground.
The drive motor should start running.
trol Board.
If motor
does not start running, troubleshoot Motor Con
If motor does start running, trouble-
shoot the Main Board.
(B)
If Fuse is good, check for 12.0V at pin 2 and 5.0V
at pin 4 of Connector CN1 A. If voltages are miss
ing, troubleshoot Power Supply.
(C)
If voltages are present, check Connectors CN1
and CN1A for good connections.
If 5V Source is not correct, check adjustment of
5V Adjust Control (VR201), see "Miscellaneous
Adjustments."
^.^
[AJ
HEAD POSITION MOTOR INOPERATIVE
(A)
Check Connector CN5 for good connections.
(D)
(B)
Disconnect Connector CN5 and check for 75
ohms between pin 1 and each of pins 3, 4, 5 and
DRIVE OPERATION IS ERRATIC
6.
If resistance readings of the Head Position
Motor (M1) are not correct, replace Motor.
(A)
dampened with 91% isopropyl alcohol.
Clean Head with a cotton swab or lint free cloth
Cs)
READ/WRITE FUNCTION INOPERATIVE
NOTE: Head cleaning diskettes are not recom
mended because they may be too abrasive.
(A)
Check Head Connector CN2 for good connec
tions.
(B)
Check Spindle Speed Control (VR1) adjustment,
see "Miscellaneous Adjustments".
(B)
Check resistance of the Read/Write sections of
both Heads, Head 0 and Head 1. Check for a re
sistance of about 11 ohms between pins 2 and 4,
4 and 10. 4 and 6, 1 and 3. 3 and 9 and between
pins 3 and 5 of Connector CN2.
©
DRIVE MOTOR NOT WORKING
(A)
Check Connector CN7 for good connections.
(C)
Check for 16MHz at pin 1 of IC U5. If frequency
is not correct check Oscillalor Module (Y1).
PRELIMINARY SERVICE CHECKS (Continued)
GENERAL OPERATING INSTRUCTIONS
DIRECTORY
FORMATTING A DISKETTE
To get a Directory (list of programs on a diskette) type
LOAD "$",8 and press the RETURN key. After the Directory
Directory on the Monitor screen.
A blank diskette must be formatted before it will work in the
Disk Drive. To format a diskette, insert a blank diskette into
is loaded, type LIST and press the RETURN key to list the
the Disk Drive and close the door. Type the following with a
code enclosed in the quotes with NO:.
1
name for the diskette and a two character identification
RETURN key. Example: OPEN 1,8.15"NO:NAME,!D"CLOSE
Then, press the
INITIALIZING THE DRIVE (RESET)
To initialize the Disk Drive.type OPEN 15.8,15,"I":CLOSE 15
and press the RETURN key.
If a FILE OPEN error message
DISK DRIVE ERROR SIGNAL (BLINKING LED)
appears on the screen, it means that file 15 has been
already opened by a previous operation and was not proper
If the LED (Green) (CR98) on the front panel of the Disk Drive
starts blinking, it means an error in operation has occurred
and an error message has been stored in the Disk Drive
memory. Use the following program to read and display the
error message. The program displays the error number,
message, track and sector where the error has occurred.
10 OPEN 15,8,15
ly closed. Type CLOSE 15 and press the RETURN key, then
repeat the initializing procedure.
LOADING PROGRAMS
To load a program from the Disk Drive, type LOAD with the
Program Name enclosed in quotes, followed by a .8 and
press the RETURN key.
SAVING PROGRAMS
Example: LOAD "SAMS" .8.
20 INPUT &15,EN,ES,T,S
30 PRINT "ERROR #";EN,E$
40 PRINT "TRACK #";T,"SECTOR #";S
50 CLOSE 15
To save a program to the Disk Drive, type SAVE with the Pro
gram Name enclosed in quotes, followed by a .8 and press
the RETURN key.
Example: SAVE "SAMS" ,8.
DISASSEMBLY INSTRUCTIONS
CHASSIS REMOVAL
Remove four screws
from cabinet bottom which
hold
cabinet top. Lift cabinet top from unit. Remove two screws
from side of chassis holding shield over main circuit board.
Remove six screws holding chassis to cabinet bottom and
lift chassis from cabinet.
To remove drive unit Irom chassis, disconnect Connectors
P5 thru P8.
chassis
Remove four screws, two from each side of
to chassis.
Remove seven
holding drive unit
screws holding main circuit board and lift out of the way.
Carefully remove drive unit from chassis.
MISCELLANEOUS ADJUSTMENTS
DISK DRIVE DEVICE NUMBER
Number 8
used
in
Load and
Save
procedure
is
device
VOLTAGE ADJUSTMENT
Connect positive lead of voltmeter to 5.0V Source (pin 4 of
Connector CN1), negative lead to ground.
On.
Turn Disk Drive
Adjust 5V Adjust Control (VR201) for 5.0 volts.
number assigned to Disk Drive.
Device number can be set
to any number from 8 to 11 by setting two Switches on back
of Disk Drive. Use chart to select device number. Note: Left
and right viewed from rear of drive.
HEAD CLEANING INSTRUCTIONS
Device
Number
Left Switch
UP
DOWN
UP
DOWN
Right Switch
Use a lint free cloth or swab dampened with 91 % isopropyl
alcohol to clean the disk drive heads and dry with a lint free
cloth.
8
UP
UP
DOWN
9
10
il
DOWN
IV

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