NEC FD1165 User manual

F Dl 165
Flexible Disk Drive
Maintenance Manual
SEC
NEC Info rm ation System s. In c.
819-000090-2001
10-82

LIABILITY DISCLAIMER
NEC Information Syst ms, Inc. products ar warrant d in
accordanc with th t rms of th applicabl NEC Information
Syst ms, Inc. product sp cification. Product p rformanc
is aff ct d by syst m configuration, softwar , th applica
tion, custom r data and op rator control of th syst m among
oth r factors. Whil NECIS products ar consid r d to b
compatibl with most syst ms, th sp cific functional impl 
m ntation by custom rs of th product may vary.
Th r for , th suitability of a product for a sp cific
application must b d t rmin d by th custom r and is not
warrant d by NECIS.
This manual is as compl t and factual as possibl at th
tim of printing, how v r, th information in this manual
may hav b n updat d sinc that tim . NEC Information
Syst ms, Inc. r s rv s th right to chang th functions,
f atur s, or sp cifications of its products at any tim ,
without notic .
NEC Information Syst ms, Inc. has pr par d this docum nt for
us by NECIS mploy s and custom rs. Th information con
tain d h r in is th prop rty of NECIS and shall not b r 
produc d in whol or in part without prior writt n approval
from NECIS.
First Printing - Octob r 1982
Copyright 1982®
NEC Information Syst ms, Inc.
5 Militia Driv
L xington, MA 02173
Print d in U.S.A.

FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY
INTERFERENCE STATEMENT
Although disk driv s as subsyst m typ compon nts do not
r quir FCC rating, th following stat m nt appli s to th
Mod l FD1165.
This unit has b n typ t st d and found to comply with th
limits for a Class B computing d vic in accordanc with th
sp cifications for Subpart J of Part 15 of FCC Rul s, which
ar d sign d to provid r asonabl prot ction against such
int rf r nc in a r sid ntial installation.
Manufactur r's Instructions and Us r's R sponsibiliti s
to Pr v nt Radio Fr qu ncy Int rf r nc
Manufactur r's Instructions
Th us r must obs rv th following pr cautions in install
ing and op rating this d vic :
1. Op rat th quipm nt in strict accordanc with th
manufactur r's instructions for th mod l.
2. Ensur that th unit is plugg d into a prop rly
ground d wall outl t and that th pow r^ cord sup
pli d with th unit is us d and not modifi d.
3. Ensur that th unit is always op rat d with th
factory install d cov r s t on th unit.
4. Mak no modification to th quipm nt which would
aff ct its m ting th sp cifi d limits of th
Rul s.
5. Prop rly maintain th quipm nt in a satisfactory
stat of r pair.

Us r's R sponsibility
Th us r has th ultimat r sponsibility to corr ct probl ms
arising from harmful radio-fr qu ncy missions from quip
m nt und r his control. If this quipm nt do s caus int r
f r nc to radio or t l vision r c ption, which can b
d t rmin d by turning th quipm nt off and on, th us r is
ncourag d to try to corr ct th int rf r nc by on of th
following m asur s. All of th s r sponsibiliti s and any
oth rs not m ntion d ar xclusiv ly at th xp ns of th
us r.
1. Chang in ori ntation of th r c iving d vic
ant nna.
2. Chang in ori ntation of th quipm nt.
3. Chang in location of quipm nt.
4. Chang in quipm nt pow r sourc .
If th s att mpts ar unsucc ssful, install on or all of
th following d vic s:
1. Lin isolation transform rs
2. Lin filt rs
3. El ctro-magn tic shi lding
If n c ssary, th us r should consult th d al r, NEC or an
xp ri nc d radio/t l vision t chnician for additional sug
g stions. Th us r may find th following bookl t pr par d
by th F d ral Communications Commission to b h lpful; "How
to Id ntify and R solv Radio-TV Int rf r nc Probl ms."
This bookl t is availabl from th U.S. Gov rnm nt Printing
Offic , Washington, D.C. 20402, Stock No. 004-000-00345-5.
"Not : Th op rator of a computing d vic may b r quir d
to stop op rating his d vic upon finding that th d vic
is causing harmful int rf r nc and it is in th public
int r st to stop op ration until th int rf r nc probl m
has b n corr ct d."
i v

CONTENTS
Pag
1.1 DESCRIPTION................................... 1-1
1.2 CONSTRUCTION AND FEATURES . .................... 1-2
1.2.1 Bas Fram ...... .................... 1-2
1.2.2 Spindl Ass mbly .................... 1-2
1.2.3 Dc Dir ct Driv Spindl Motor ....... 1-3
1.2.4 Carriag R ad/Writ Ass mbly H ads... 1-3
1.2.5 St pping Motor ....... . ............... 1-3
1.2.6 H ad Load Cam Ass mbly.......... 1-3
1.2.7 Pop-Up F atur .. .................... 1-4
1.2.8 Ind x S nsor........ ................ 1-4
1.2.9 00 Track S nsor............ 1-4
1.2.10 Writ Prot ct S nsor ................ 1-4
1.2.11 M dia-In S nsor. .................... 1-4
1.2.12 Coll t Ass mbly. .................... 1-4
1.2.13 Print d Circuit Board (PCB).......... 1-4
1.2.14 Variabl Fr qu ncy Oscillator
(Optional) . ........... 1-4
1.2.15 Display Lamps... .................... 1-5
1.2.16 Front Pan l............ ............. 1-5
1.2.17 Movabl Door Handl ................. 1-5
1.2.18 Door Lock Sol noid .................. 1-5
1.3 SPECIFICATIONS.......... 1-5
CHAPTER 1 GENERAL INFORMATION
CHAPTER 2 INSTALLATION AND OPERATION
2.1 PRELIMINARY INSPECTION... .................... 2-1
2.2 UNPACKING AND REPACKING ...................... 2-1
2.2.1 Unpacking Proc dur .................. 2-1
2.2.2 R packing Proc dur .................. 2-1
2.2.3 Pr installation Insp ction .......... 2-3
2.3 ENVIRONMENTAL REQUIREMENTS ................... 2-3
2.3.1 Op rating Environm nt................ 2-3
2.3.2 Spac and W ight Data ............... 2-3
2.3.3 Mounting ............................ 2-3
v

CONTENTS (cont’d)
2.4 POWER SUPPLY ................................. 2-6
2.4.1 Pow r Supply Sp cifications ......... 2-6
2.4.2 Pow r Conn ctor ..................... 2-6
2.4.3 Pow r Conn ctor Pin Assignm nts ..... 2-7
2.5 INTERFACE CONNECTION ......................... 2-8
2.6 TERMINATOR RESISTORS ......................... 2-9
2.7 DRIVE IDENTIFICATION (DX) SELECTION .......... 2-12
2.8 OPTION SELECTION ................... 2-12
2.8.1 H ad Load Jump r (HL) ............... 2-12
2.8.2 Radial R ady Jump r (RX) ............ 2-12
2.8.3 Sid S l ct Jump r (SS) ............. 2-12
2.8.4 Writ Prot ct Jump r (PR) ........... 2-13
2.8.5 Fil Unsaf Jump r (FR) ............. 2-13
2.8.6 Door Lock Jump rs (DL, DR, DH) ...... 2-13
2.8.6.1 DR Jump r .......................... 2-13
2.8.6.2 DL Jump r ........................... 2-13
2.8.6.3 DH Jump r .......................... 2-13
2.8.7 In Us Pins (US) .................... 2-14
2.8.8 R ad Data Pins (RD) ................. 2-14
2.8.9 Busy Lamp Jump rs (BU, BS) .......... 2-14
2.8.9.1 Busy Lamp On During H ad Load ...... 2-14
2.8.9.2 Busy Lamp On During Driv S l ct ... 2-15
2.8.9.3 Busy Lamp On During In Us ......... 2-15
2.9 OPERATING THE FD1165 ......................... 2-15
2.9.1 Ins rting a Fl xibl Disk ........... 2-15
2.9.2 R moving a Fl xibl Disk ............ 2-16
2.10 DISPLAY LAMPS............................. 2-16
2.10.1 R ady Lamp .......................... 2-16
2.10.2 Busy Lamp.............. 2-17
Pag
vi

CONTENTS (cont’d)
CHAPTER 3 INTERFACE INFORMATION
3.1 BASIC OPERATIONAL DESCRIPTION... ............. 3-1
3.2 ELECTRICAL INTERFACE ......................... 3-2
3.2.1 Signal L v ls ....................... 3-2
3.2.2 Driv r/R c iv r Circuits ............ 3-2
3.2.3 Int rfac Lin s ..................... 3-3
3.3 INPUT SIGNALS .......... ...................... 3-3
3.3.1 Driv S l ct 1 Through 4 (DSX1 to 4). 3-3
3.3.2 H ad Load (HDL) . ..................... 3-4
3.3.3 St p (STP) .... ...................... 3-4
3.3.4 Dir ction S l ct (DIR) .............. 3-4
3.3.5 Sid S l ct (SSL) ................... 3-4
3.3.6 Writ Gat (WGT) .................... 3-5
3.3.7 Writ Data (WDT) .................... 3-5
3.3.8 Low Writ Curr nt (LWC) ............. 3-5
3.3.9 Fil Unsaf R s t (FUR) ............. 3-6
3.3.10 InUs (USE).... .................... 3-6
3.4 OUTPUT SIGNALS ......... ...................... 3-6
3.4.1 Ind x (IDX) ......................... 3-6
3.4.2 Track 00 (TKO) . . ..................... 3-7
3.4.3 Dual-Sid d (TSD) .................... 3-7
3.4.4 R ady (RDY) ... ...................... 3-7
3.4.5 Fil Unsaf (FUS) ................... 3-7
3.4.6 R ad Data (RDT) . ..................... 3-8
3.4.7 Writ Prot ct (PRT) ................. 3-8
3.4.8 Disk Chang (DCG) ................... 3-8
3.5 VFO INTERFACE SIGNALS ........................ 3-9
3.5.1 Modifi d Fr qu ncy Modulation Mod
(MFM) ............................... 3-9
3.5.2 VFO Synchronization (SYC) ........... 3-9
3.5.3 Standardiz d R ad Data (SRD) ........ 3-9
3.5.4 Window (WID) ........................ 3-9
3.6 INTERFACE TIMING..................... 3-10
3.6.1 Pow r On S qu nc ................... 3-10
3.6.2 Driv S l ct ........................ 3-10
3.6.3 St p and Track 00 ................... 3-10
3.6.4 Acc ss .............................. 3-11
3.6.5 Writ ....................... 3-11
3.6.6 R ad ................................ 3-12
Pag
vii

CONTENTS (cont’d)
CHAPTER 4 MAINTENANCE
4.1 PREVENTIVE MAINTENANCE......................... 4-1
4.2 MAINTENANCE TOOLS . ............................. 4-1
4.3 MAINTENANCE PARTS.............................. 4-1
4.4 REMOVAL AND REPLACEMENT PROCEDURES .............. 4-2
4.4.1 PCB R moval ........ ............... 4-2
4.4.2 Coll t Ass mbly R moval, R plac m nt,
and Adjustm nt ......... . ......... . 4-3
4.4.3 Carriag Ass mbly R moval and
R plac m nt........................... 4-6
4.4.4 H ad Load Cam Ass mbly and H ad Load
Cam R moval and R plac m nt ........... 4-8
4.4.5 Writ Prot ct S nsor and M dia-In
S nsor R moval and R plac m nt ......... 4-9
4.4.6 Optical Tachom t r S nsor R moval
and R plac m nt............... 4-10
4.4.7 S nsor Cabl Ass mbly (LED Ass mbly
and Ind x S nsor R moval and
R plac m nt ......................... 4-11
4.4.8 R moving and R placing th Carbon
Brush s ............................. 4-14
4.4.9 Armatur R moval .................. ... 4-15
4.4.10 Spindl Ass mbly R moval ............ 4-16
4.4.11 Front Pan l R moval............ 4-17
4.4.12 Pick r Rod R moval and R plac m nt... 4-17
4.4.13 Pop-Up Ass mbly R moval and
R plac m nt ......................... 4-18
4.4.14 Guid Rail R moval .................. 4-19
4.4.15 Ch cking th Op ration of th Pop-Up
F atur ............................. 4-19
4.4.16 Door Lock Sol noid R moval and
R plac m nt ......................... 4-20
CHAPTER 5 ADJUSTMENTS
5.1 DIAGNOSTIC TESTS............................... 5-1
5.1.1 Auto Tap T st......................... 5-2
5.1.2 Auto S k T st........................ 5-2
5.1.3 Auto S k and Auto Tap T st ............ 5-2
5.2 HEAD UNLOAD DELAY.............................. 5-2
5.3 TEST POINTS.................................... 5-3
Pag
viii

CONTENTS (cont’d)
Pag
5*4 ADJUSTMENTS AND CHECKS USING THE ALIGNMENT
FLEXIBLE DISK. . ........... * ............... . 5-3
5.4.1 H ad Radial Alignm nt Ch ck or
Adjustm nt ...... . .................... 5-4
5.4.2 Azimuth Ch ck. ...................... 5-6
5.4<3 Ind x Alignm nt Ch ck or Adjustm nt.. 5-7
5.5 OTHER ADJUSTMENTS . . ........................... 5-8
5.5.1 LED Ass mbly/Ind x Ass mbly Ch ck
and Adjustm nt..*........ ........... 5-8
5.5.2 00 Track S nsor Ch ck or Adjustm nt.. 5-9
5.5.3 Writ Prot ct S nsor Ch ck or
Adjustm nt..................... 5-10
5.5.4 H ad Load Ch ck ..................... 5-10
5.6 TRIM POTS .... . ........ 5-11
CHAPTER 6 ILLUSTRATED PARTS BREAKDOWN
CHAPTER 7 SCHEMATIC
ix

LLUSTRAT ONS
Figur Titl Pag
1- 1 FD1165 Fl xibl Disk Driv ................. 1-2
2- 1 Unpacking .................................. 2-2
2-2 Mod l FD1165 Physical Dim nsions ........... 2-4
2-3 V rtical Installation ...................... 2-4
2-4 Horizontal Installation .................... 2-4
2-5 On-End Installation ........................ 2-5
2-6 Air Flow R quir m nts for Natural Air
Cooling .................. ................. 2-5
2-7 Pow r Conn ctor Location ................... 2-7
2-8 Pin and Lin Assignm nts for th Pow r
Conn ctor .................................. 2-7
2-9 Contact Arrang m nt for Edg Conn ctor ..... 2-8
2-10 Int rfac Conn ctor ........................ 2-8
2-11 T rminator R sistors and Jump r Locations
on th PCB ................................. 2-10
2-12 Parall l and S ri s Configurations ......... 2-11
2-13 Closing th Door of th FD1165 ............. 2-15
2- 14 Unlocking th Door and R moving th
Fl xibl Disk ................ . ............. 2-16
3- 1 Driv r/R c iv r Circuits ................... 3-2
3-2 Int rfac Lin s ............................ 3-3
3-3 St p Signal Timing ......................... 3-4
3-4 WGT Timing ................................. 3-5
3-5 Writ Data Signal Timing. .................. 3-6
3-6 Ind x Signal Timing .... . .................. 3-6
3-7 R ad Data Signal Timing .................... 3-8
3-8 Disk Chang Signal Timing .................. 3-9
3-9 R ad Data and Window Signal Timing ......... 3-10
3-10 St p and Track 00 Timing ................... 3-10
3-11 Acc ss Timing .............................. 3-11
3-12 Writ Timing ............................... 3-11
3- 13 R ad Timing ................................ 3-12
4- 1 R moving th Coll t Ass mbly ............... 4-3
4-2 R placing th Coll t Ass mbly .............. 4-4
4-3 H ad Unload Spring in R lation to Spring
Plat ...................................... 4-5
4-4 Position of th Spring Plat ............... 4-5
4-5 Carriag Ass mbly Position on th Bas Fram 4-7
4-6 R moving th H ad Load Cam .... ............. 4-8
4-7 Installing th H ad Load Cam Ass mbly ...... 4-9
4-8 Writ Prot ct or M dia-In S nsor
Conn ctions ................................ 4-10
4-9 Installing th Writ Prot ct or M dia-In
S nsor..................................... 4-10
4-10 R moving th R placing th Optical
Tachom t r S nsor .......................... 4-11
x