Acorn Computers Limited Winchester disk 110 Manual de usuario
WINCHESTER DISC
110 & 130
SERVICE MANUAL
Part No 0427,001
Issu 1
August 1984
Within this publication th t rm 'BBC' is us d as an abbr viation for '
British Broadcasting Corporation'.
Copyright Acorn Comput rs Limit d 1984
N ith r th whol or any part of th information contain d in, or th product
d scrib d in, this manual may b adapt d or r produc d in any mat rial form
xc pt with th prior writt n approval of Acorn Comput rs Limit d (Acorn
Comput rs).
Th product d scrib d in this manual and products for us with it, ar
subj ct to continuous d v lopm nt and improv m nt. All information of a
t chnical natur and particulars of th product and its us (including th
information and particulars in this manual) ar giv n by Acorn Comput rs in
good faith. How v r, it is acknowl dg d that th r may b rrors or omissions
in this manual. A list of d tails of any am ndm nts or r visions to this
manual can b obtain d upon r qu st from Acorn Comput rs T chnical Enquiri s.
Acorn Comput rs w lcom comm nts and sugg stions r lating to th product and
this manual.
All corr spond nc should b addr ss d to:-
T chnical Enquiri s
Acorn Comput rs Limit d
N wmark t Road
Cambridg
CB5 8PD
All maint nanc and s rvic on th product must b carri d out by Acorn
Comput rs' authoris d d al rs. Acorn Comput rs can acc pt no liability
whatso v r for any loss or damag caus d by s rvic or maint nanc by
unauthoris d p rsonn l. This manual is int nd d only to assist th r ad r in
th us of this product, and th r for Acorn Comput rs shall not b liabl
for any loss or damag whatso v r arising from th us of any information or
particulars in, or any rror or omission in, this manual, or any incorr ct
us of th product.
This manual is for th sol us of Acorn Comput rs' authoris d d al rs and
must only b us d by th m in conn ction with th product d scrib d within.
ACORN and ECONET ar trad marks of ACORN Comput rs Limit d.
First publish d 1984
Publish d by Acorn Comput rs Limit d
WINCHESTER DISC SERVICE MANUAL
Cont nts pag
1 Introduction 1
2 Packaging and installation 2
3 Sp cification 3
3.1 Disc driv 3
3.2 ADAPTEC ACB-4000 Winch st r disc controll r 3
3.3 Host Adapt r 3
3.4 Pow r supply 3
3.5 Environm ntal 4
3.6 Outsid dim nsions 4
3.7 Conn ctions 4
4 Disass mbly and ass mbly 5
5 Circuit d scription 8
5.1 Th disc controll r board 8
5.1.1 SCSI control and data lin s 9
5.1.2 SCSI conn ctor pinout (PL2 and J4) 10
5.1.3 Bus phas s 10
5.1.4 Th r s t condition 12
5.1.5 Th ST-412 disc int rfac conn ctor pinouts (J2 and J0) 13
5.2 Th 1MHz xpansion bus 14
5.2.1 Control, addr ss and data lin s 14
5.2.2 Conn ctor pinout 14
5.3 Winch st r Disc Host Adapt r 15
5.3.1 Addr ss d coding and handshaking 15
5.3.2 Buff ring 16
5.3.3 T rmination 16
6 T st quipm nt and formatting 17
7 Fault finding 18
7.1 Pow r supply 18
7.2 Addr ss d coding 19
7.2.1 &FC40 r ad data 19
7.2.2 &FC40 writ data 19
7.2.3 &FC41 r ad status 20
7.2.4 &FC42 writ s l ct 20
7.2.5 &FC43 writ IRQ nabl 21
7.3 Handshaking 21
7.4 Bus lin s 22
App ndix
Host Adapt r PCB circuit diagram 25
Winch st r Disc unit block diagram 27
Winch st r Disc unit parts list 28
Winch st r Disc unit ass mbly diagram 29
Winch st r Disc unit wiring diagram 31
LED conn ction diagram 33
Winch st r Disc Host Adapt r parts list 34
Host Adapt r PCB ass mbly diagram 35
WARNING: THE WINCHESTER DISC UNIT MUST BE EARTHED
IMPORTANT: Th wir s in th mains l ad for th apparatus ar colour d in
accordanc with th following cod :
GREEN & YELLOW - EARTH
BLUE - NEUTRAL
BROWN - LIVE
As th colours of th wir s may not corr spond with th colour d markings
id ntifying th t rminals in your plug, proc d as follows:
Th wir which is colour d gr n and y llow must b conn ct d to th t rminal
in th plug which is mark d by th l tt r E, or by th saf ty arth symbol ±
, or colour d ith r gr n or gr n and y llow.
Th wir which is colour d blu must b conn ct d to th t rminal which is
mark d by th l tt r N, or colour d black.
Th wir which is colour d brown must b conn ct d to th t rminal which is
mark d by th l tt r L, or colour d r d.
If th sock t outl t availabl is not suitabl for th plug suppli d, th plug
should b cut off and th appropriat plug fitt d and wir d as pr viously
not d. Th mould d plug which was cut off must b dispos d of as it would b
a pot ntial shock hazard if it w r to b plugg d in with th cut off nd of
mains cord xpos d.
Th mould d plug must b us d with th fus and th fus carri r firmly in
plac . Th fus carri r is of th sam basic colour* as th colour d ins rt in
th bas of th plug. Diff r nt manufactur rs' plugs and fus carri rs ar not
int rchang abl . In th v nt of loss of th fus carri r th mould d plug
MUST NOT b us d. Eith r r plac th mould d plug with anoth r conv ntional
plug wir d as pr viously d scrib d, or obtain a r plac m nt fus carri r from
an Acorn Comput rs authoris d d al r. In th v nt of th fus blowing, it
should b r plac d, aft r cl aring any faults, with a 5 amp fus that is ASTA
approv d to BS 1362.
*Not n c ssarily th sam shad of that colour.
1. Introduction
This manual is int nd d to provid th information r quir d to
diagnos and r pair faults on th Winch st r Disc unit which was
d sign d by Acorn Comput rs Limit d of Cambridg , England.
Th only d al r-s rvic abl part of th Winch st r Disc unit is th
Host Adapt r print d circuit board. Faults d t ct d in th disc
driv , disc controll r board, or pow r supply m an that th faulty
part must ith r b r turn d for r pair or r plac d. D al rs may hold
stock of th s it ms and should r f r to information provid d by th ir
suppli r for s rvic proc dur s for th s units.
Th information contain d in this manual is aim d at s rvic ngin rs
and Acorn d al rs who will b s rvicing th Winch st r Disc unit on
b half of Acorn Comput rs Ltd.
1
2. Packaging and installation
Th Winch st r Disc unit is suppli d fitt d with two xpand d poly thyl n
nd pi c s in a corrugat d card box. Suppli d with th Winch st r Disc unit
is a Us r Guid , a ROM lab ll d ADFS, a mains l ad, a 1MHz bus l ad and a
guarant card which ar all pack d in a card tray locat d in th top of th
box.
Th ADFS ROM must b plugg d into on of th host microcomput r's sid ways
ROM sock ts, or th Winch st r filing syst m will not work.
Th Winch st r Disc unit must b conn ct d to a 240V AC 50Hz supply via th
mains l ad provid d and th sock t at th r ar of th unit.
A mains pow r switch is locat d at th r ar of th unit.
A 3.15A typ F fus is locat d in a hold r b n ath th mains sock t at th
r ar of th unit.
Th Winch st r Disc unit must b conn ct d to th host microcomput r's 1MHz
xpansion bus sock t using th ribbon cabl provid d.
Th r is a gr n activity lamp on th front pan l which illuminat s wh n th
driv is b ing acc ss d.
Th Winch st r unit is fragil , and must not b subj ct d to any shock. Do not
us th unit in conditions of xtr m h at, cold, humidity or dust or in
plac s subj ct to vibration. Do not block v ntilation in front of or b hind
th unit, sp cially th fan intak at th r ar. Ensur that no for ign
obj cts ar ins rt d through any op nings in th cas . Do not mov th unit
whil it is op rating.
Th unit must b transport d in its original packing, which must b r tain d
for futur us .
2
3. Sp cification
Th Winch st r Disc unit provid s storag and r tri val of data and programs
on non-r movabl magn tic discs. This can b local storag for a
microcomput r such as th BBC Microcomput r mod l B or as a fil s rv r for an
ACORN ECONET local ar a n twork.
Th Winch st r Disc unit consists of a 10 Mbyt (mod l 110) or 30 Mbyt (
mod l 130) hard disc driv , an ADAPTEC ACB-4000 Winch st r Disc Controll r,
an Acorn Host Adapt r Board which is an int rfac b tw n th ACB-4000 and th
host comput r's 1 MHz xpansion bus, and a pow r supply unit. Th unit also
contains a 240V AC fan for cooling.
3.1 Disc driv
Capacity 10M (mod l 110) or 30M (mod l 130) formatt d
Format ADAPTEC 33 s ctors of 256 byt s
Cylind rs 306 (10M v rsion)
H ads 4 (10M v rsion)
Disc rpm 3600
3.2 ADAPTEC ACB-4000 Winch st r disc controll r
Disc int rfac ST-412
Host int rfac SCSI
3.3 Host Adapt r
SCSI to 1 MHz xpansion bus
3.4 Pow r supply
Minimum input voltag 198V AC
Maximum input voltag 264V AC
Supply fr qu ncy 47 to 53Hz
+5V output voltag 4.9 to 5.2V
+5V output curr nt 0.7 to 3.5A
+5V ov rvoltag prot ction 5.8 to 7.0V
+5V ov rcurr nt prot ction 5.0A
+12V output voltag 11.4 to 12.6V
+12V output curr nt 0.6 to 3.0A
+12V surg output curr nt 5A for 15 s conds
+12V ov rvoltag prot ction 13.0 to 16.0V
+12V ov rcurr nt prot ction 6.0A
3
3.5 Environm ntal
Minimum op rating t mp ratur 0 d gr s C
Maximum op rating t mp ratur +37 d gr s C
Minimum storag t mp ratur -30 d gr s C
Maximum storag t mp ratur +60 d gr s C
Maximum op rating humidity 80% RH at 35 d gr s C
Maximum storag humidity 80% RH at 55 d gr s C
Op rating altitud 0 to 1800 m tr s abov s a l v l
Storag altitud 0 to 3500 m tr s abov s a l v l
Th rmal gradi nt 10 d gr s C p r hour
Op ration lif tim 50,000 hours
M an tim b for failur 10,000 hours of typical usag
3.6 Outsid dim nsions
h ight 100mm (108mm including f t)
width 335mm
d pth 365mm
3.7 Conn ctions
Two 37 way D-typ sock t conn ctors ar provid d for 1MHz bus daisy chain
conn ction. Th s ar on th r ar pan l and ar lab ll d '1MHz bus IN' and '
OUT', although th y ar in fact id ntical. Thr r movabl r sistor packs ar
mount d on th Host Adapt r PCB insid th cas for 1MHz bus t rmination.
Th s packs ar fitt d as standard, but n d b r tain d only in th last
unit in th daisy chain.
Also on th r ar pan l is an IEC plug for mains pow r input.
4
4. Disass mbly and ass mbly
Warning: wh n th Winch st r Disc unit is mov d or work d upon, gr at car
must b tak n not to drop, jar or shock th unit in any way. If th hard disc
is brok n through car l ss handling th n th unit is uns rvic abl .
i) Ensur that th unit is disconn ct d from th mains pow r supply b for
dismantling it.
ii) To s rvic th Host Adapt r PCB, r mov th thr small phillips scr ws
lab ll d A in figur 1, und rn ath th front of th unit which hold on th
front pan l.
(Th unit may b turn d on its back to do this if d sir d, but th n r m mb r
that r f r nc s to l ft and right in th following d scription will b
r v rs d.)
Figur 1 Scr ws to r mov
5
Este manual sirve para los siguientes modelos
1
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