Kurzweil PC88 User manual

PC88
Service Manual
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ae Colo
MULT AAA
©1995
All
rights
reserved.
Kurzweil
is
a
product
line
of
bead
Chang
Co.;
Kurzweil,
PC88,
and
VGM
are
trademarks
of
Young
Chang
Co.
All
other
products
and
brand
names
are
trademarks
or
registe:
trademarks
of
their
respective
companies.
Product
features
and
specifications
are
subject
to
change
without
notice.
Part Number: 910276 Rev. A

INSTRUCTIONS PERTAINING TO A RISK OF FIRE,
ELECTRIC SHOCK, OR INJURY TO PERSONS
IMPORTANT SAFETY AND
INSTALLATION INSTRUCTIONS
WARNING - When using electronic products, basic precautions should always
_ be followed. Read all of the Safety and Installation Instructions before using
the product.
Do not use this product near water, such as near a bathtub, sink, in a wet
basement, near a swimming pool, or the like.
This product, in combination with an amplifier and speakers or headphones,
may be capable of producing sound levels that could cause permanent hearing
loss. Do not operate for a long period of time at a high volume level of at a
level that is uncomfortable. If you experience any hearing loss or ringing in the
ears, you should consult an audiologist.
The product should be located away from heat sources such as radiators, heat
registers, or other products that produce heat.
The product should be connected to a power supply only of the type described in
the operating instructions or as marked on the product.
This product is equipped with a polarized line plug (one blade wider than the
other). This is a safety feature. If you are unable to insert the plug into the
outlet, contact an electrician to replace your obsolete outlet. Do not defeat the
safety purpose of the plug.
The product should be serviced by qualified service personnel when:
A. The plug has been damaged; or
B. Objects have fallen upon, or liquid has been spilled into the product; or
C. The product has been exposed to rain; or
D. The product does not appear to be operating normally or exhibits a
marked change in performance; or
E. The product has been dropped, or the enciosure damaged.
Do not attempt to service the product. All servicing should be referred to
qualified service personnel.
WARNING - Do not place the power cord, or the product in a position where
anyone could trip over, walk on, or roll equipment over them. Do not allow the
product to rest on or be installed over cords of any type. Do not place the power
module where it cannot receive cooling air, such as under a rug. Improper
installations of this type may create the possibility of a fire hazard and/or
personal injury.
PC88 Service Manual
ii

RADIO AND TELEVISION INTERFERENCE
WARNING - Changes or modifications to this instrument not expressly
approved by Young Chang could void your authority to operate the instrument.
IMPORTANT - When connecting this product to accessories and/or other
equipment use only high quality shielded cables.
NOTE: This instrument has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This instrument generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If this instrument does cause harmful interference to radio or
television reception, which can be determined by turning the instrument off and
on, the user is encouraged to try to correct the interference by one or more of the
following measures:
¢ Reorient or relocate the receiving antenna.
¢ Increase the separation between the instrument and the receiver.
¢ Connect the instrument into an outlet on a circuit other than the one to
which the receiver is connected.
¢ If necessary consult your dealer or an experienced radio/television
technician for additional suggestions.
NOTICE
This apparatus does not exceed the Class B limits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.
AVIS
Le present appareil numerique n’emet pas de bruits radioelectriques depassant
les limites applicables aux appareils numeriques de la class B precrites dans le
Reglement sur le brouillage radioelectrique edicte par le ministere des
Communications du Canada.
PC88 Service Manual
iii

Table of Contents
Chapter 1, Basic Operation
BROAT
PAM
costa
tid
ccedisines
ee
tel
Decal
tat
atau
tlie
ot
So
de
1-1
TOWER
cosciactes
tere
Saati
aera
tos
ecu
eais
eednceesan
eee
ot
eee
1-1
1%,
BG)
eeqvoneeer
ea
ee
erenent
ne
sre
tis
Cnr
ts
et
Omer
ee
rene
Nt
Re
Pee
TEE
1-1
LCD
Contrast
Adjustment
00.00...
cesseeeeeseseeseseseeteseseeneses
1-2
SWAUCH
POCA)
S
Sasesa
te
syu
caticial
eu
neetely
ect
ean
Neoe
glieeemyieese!
1-2
Continuous
Control
Pedals
oo...
cesccsssceccesscesssssscessceeees
1-2
PRUIGIO
QING
seein
its
onem
dl
pete
i
tee
lai
aah
Scena
tetaad
ote
Oran
1-3
Pron
Panel
6a.
ssscehentssiiadcsces
siete
Mass
can,
Sead
caudoes
gaseutit
eis
aa
asnnas
1-3
LCD
and
Cursor
Buttons
.........cccccccssssscecescesceccecescesscesssscaes
1-3
Sound
/Setup
Select
.......cssosesesercccssserssssassssserssecsesssseassseevees
1-4
Internal-VoOiceScs
si:
noe
will
teneie
ici
dads
nea
das
achimte
heed
1-4
MUEDE S@UUDS -siesspcasissintstuseeiestsies AR bre hers heer lead etal a dnt 1-4
ZONE
PAarAaMeters
ced.
siocdisietenipigidaeha
ddaueaestaceedeiarsemans
banal’
1-5
Zone
Select
and
Assignable
Controllers
.......cccccsccssesesseeeeees
1-5
Dieta
Gey
oz
22.5
san
sstatanured
dunce.
Satara
spelen
aiadedasadaiuata
catuieeessianiaee
1-6
Master
V
Oli
ceca
fienidie:
sissies
cnietees
eaeecloiahebtelawuvaxaaceeeeasipetessavinetigens
1-7
PATMC
Bu
lOi
iis
ee
Siacciechevstaitoeivtitd,
oo
ataicenaiete
sexo
Nebelatoss
1-7
|
5
(fol:
gee
en
ete
emt
ae
ne
ee
ere
eee
te
Conte
aR
ee
eT
1-8
Chapter 2, Diagnostics
Did
sriostic
Tests
slau
scstlivlns,
tinsel
ioe
ean
sheutina
cede
eee
Sa
atibiaemouees
2-1
DCANNED
LOSES
sii)
thshgie
iene
viwleaiuamse
Seine
sialtvacieaneniak
ume
beediws
2-1
Entering.
Dia
SnOSti
Cs:
5
20s
cacescecuton
ous
ctactayeuaseelanneanaid
2-2
LCD
and
Control
Panel
Buttons
...........cccccessesssssscsescsssssessesens
2-3
Diagnostic:
Tests:
sissies
aig
scsavibsthorteseret
peared
tieatstia
lesser
ccenisiSini:
2-4
WIC
MIO
DG
a2,
sso
oho
tied
aienurenatunt
ni
aacltont
cancel
nadie
2-4
Burnett
MOG
seiavecacs’
cloncetyettec
iterate
hte
ciaceesssernaedontnerder
2-4
DODO
MOG
es
ales
wi
itictetscaletsh
cidade
ues
balms
ieee
2-5
DOU
MOE
ents
cpiscscindetats
Sie
teccerthentarerdilesd
aclu
betas
satel
Aunaeiee
S
2-6
Description
of
Tests7
fei
ncs
tu
astincwrciniealiesienaea
ne
larcihains
2-7
CPU
Test
aictccrcars-
usage
a
ssn
gh
aiuan
cade
sansudadiessavaniten
eeveiareatan
2-7
Program.
ROM,
Test
siscstensiscsscennntu
ea
dsaecet
thes
tac
smauioctactaines
2-7
TT
CS
Uo
tas
pli
oeser
hates
oie
cts
lowe
tata
aces
Tea
te
2-7
IN
VIR
AINE
TeS0
caitatsicccuecttensts
tediens
casts
tatacttod
cated
sdailbdesct
calcd
2-8
MIDIUART.
Test
csccvesocecueae.
oi
sata
asancandneeeuadads
thexiagee
2-8
DCAMCr:
LOSE
eat
p
ceded
talaga
ae
nner
tn
eaters
2-9
Parallel
I/O
(PI/O)
Test
........cccccscscssssscssseseessssessseesestseesscsees
2-9
PC88
Service
Manual
1U

TIM Ete POSE aks fveere te dtvies coves eno eet ihe deren 2-9
PIOTIOE VASE sxecstcciice eho eet eae at ey ucaieraler belt tatuedinetesete 2-10
Sound ROM: Vest vies cece ssh ea lege Seanad cee tae badd 2-10
Mate Test ciipicscclsececna bids: caselatenenenngeriainalstete tan dutistasoaines 2-11
Delany TRAM Test 2cses a tasesstaetetsnnsnjeadnrsen oataatages focdoabeneanansna 2-11
LEDs TeStertac creed tur eevee i Ase ee 2-11
VGM- Port TeStéisacicie tlt ioresh vinta cekeersas an eee 2-12
COU CSE iy ait ctce eens sates toate aaah ses eeecoataen ek eet 2-13
SCANTIOE TCS US vesos cezszcseswiewserraea dna teouieaven tam svereiereenenesae 2-14
Data Wiel citccccce.teecl tiasaecegedet oy fataetoednas accne te ieeeet seats 2-14
Front Pariel Buttons: «. csecicccscgescassvenssascatiaaviccsnceadetsseeeenes 2-15
Front Panel Suid ers ics ices ane een nae 2-15
Keyboard wsciestiaisisssenttatetdisnyeaneteceencatiedonilerarteisperseersaneastiaahs 2-16
Mod Wheels .....c.ccccscsecsceesseseeeeees Pastas eho et ch 2-17
Switch Pedals wicca eee ass ine eeaiosiinen case 2-17
Continuous Control Pedals .............cccccssssscccceeeenseneeeseeee 2-18
Chapter 3, Disassembly/Assembly
TAtPOC CHO: a esesintsnctei anh ancien atin ene en nines 3-1
EMI Shields/Enclosure Support Wall .........:ccsccesesesenees 3-2
PIG UGS oectecssited A veo ted daca cte, ta alo anasepwnants datesatelpsaeesa nates eabtliags 3-2
Assembly Instructions siidisca.sectseccore: ioc tnaiienian asain 3-3
BMY SHEL AS ass ccssen dacs ewsctsavscaacutvatisa gaaleisth daded sales Kec Synedneawadebotlap cateves 3-4
PIGUne D2 ends etcealerh par aidibanlinseatiananieece el aaneeiesest 3-4
Opening the PC8S sicsicsdsetecestaeusatrccnscasesetaracaredasensttonneiwbvnayierts 3-5
FUGUES O23 ates ssascsvscsesaentnsinclecwanaacscennsles ties ee lghate soluatacubecoeaitebersnecs 3-5
Removing the Top Cover Assembly ........cssesecseeeneetees 3-6
Pipire.3 Aoaiiiiae caigiettneieaariasans pis sbbieuastesderandscaalspaasdelnens 3-6
Pig uire: 3.5 & Jedsasssventieduv conti subitiabancsl cuceodsi cies eeteaeact ines nipiete ates 3-7
PiU 3G cash siyasencecstendecesta stead sagaadeseaep nage ott eee qenceana aeeaeneesiese 3-8
Replacing the Top Cover .......scssssssssssesssssnsserssscsesseetsenonesnees 3-9
Removing the I/O Board ......cccecseeseesssserseeseeesenesessenenereens 3-10
Replacing the [/O Board ......ccccsssesseseeeeseeesenesssnseesenenenees 3-11
Removing the Control Panel/Switch Board ...............+4 3-11
Replacing the Control Panel/Switch Board ...........00+ 3-12
Removing the LCD Board ........ccessseeeeseeneeeeeneneereneneenes 3-13
Replacing the LCD Board .........:ssssssssssenenseneneesseeneesenetsans 3-14
Removing the Slider Board .........cccscccseseeteteeeeeeeteenenes 3-15
Replacing the Slider Board .........ccccssseseseeseeeseeeeeeneteneens 3-15
Removing the Engine Board ........ccccceeeseteeeseseeteeneneees 3-16
Replacing the Engine Board ........ccccscsesseeseseeseesseeneneneees 3-16
Removing the VGM Board .......ccssseeeetsseteneeeneeneneneeneees 3-17
PC88 Service Manual
v
—

Replacing the VGM Boat... cesesssesetseererenenseeeneeees 3-17
Enclosure Support Wall wicvsissciicsssccsessssycvosssanuetsveniwas ese duedeossataeies 3-18
Openiti¢ the: PC88 a4 idisitadaniwis ah NAGS wtdetlagols 3-18
BiG 6G: Daz ssc wsiiyesinle Ruin donctined ns ton nadia Niatameera tiene 3-18
PIG Ure: Bi isis cheastatat oantivacicastuanurteter i edetecariencndeaccnaean aes 3-19
Removing the Top Cover Assembly ...........:scseeseeeeeeeees 3-20
FEL UID. 9 ase Mra css saya sedeaiuents sels Sho tn ernaBRa indi seas hecuee aaa 3-20
Bip re Dil Oh secs cctiee secs eats me) ieresieliGaataens hasten Gieatacs tote ba days 3-21
Pip Ure Sal sss tev. wesc socecnustscvans taped sanoidvnetisiyavialancosasotoats chtamibiecedss 3-22
Replacing the Top Covel ecsicissvsimaisenovacsnteRapicensdanialaiuanine 3-23
Removing the I/O Board... ccccscssssssesssssscsessstseeesceseeses 3-24
Replacing the I/O Board oo... ceecceeeeeeeeeeeeesensseecessens 3-25
Removing the Control Panel/Switch Board ................... 3-25
Replacing the Control Panel/Switch Board 0.0... 3-26
Removing the LCD Board ........cccccesssssesesesseesessnersteeeneees 3-27
Replacing the LCD Board uo... ccccessesesseseesssesssesesencerens 3-28
Removing the Slider Board o.......cececsssesessesceseseeeseeseseees 3-28
Replacing the Slider Board ws ssssssssnesseeseeesereeeeenees 3-29
Removing the Engine Board occ esscesesecsesseecseeeeeeaes 3-30
Replacing the Engine Board ou... cesses esesesesseeeeseens 3-30.
Removing the VGM Boat wiwccsescsssssssesesssesessseseasseseeens 3-31
Replacing the VGM Board ou... csecsesssesececestsesseneneseenens 3-31
Removing the Mod Wheel Assembly .........ccccssssessseseseseeees 3-32
Removing the Keyboard 2 sscsisaatenitsh sinsassauitvetcndiontuietel sissies 3-33
FU BUT 1 25 csacsztahciaacisadienl stars ateaagsdurey astentenbia tee satatan tava iads 3-33
RREMOVW 1g a ROY i vind sees vesietaduhageseseteca ahsuieacteznse sanesarsoaluvaustvdeateek 3-35
Pig Uae Dud sashes shnssseadsnetanscesanenedugatavaniparnonnate ee mubeiasnaukabligadiats 3-35
Natural WHC IRC YS vs cniit tui achdioeel ototench personae sitiosdedhet ass 3-36
SH arp y BIACK CYS sess eauiticl siesta tenets i eee cients 3-36
Replacing a Key sccssesenteihs tS ssvsinseh Se sanisvtebesdabia alien neatesceetgeasedyeact 3-37
Removing the Keyboard Contact Boards ..0.....ceeseeseeeeeeees 3-38
Removing the Treble Contact Board. ..........ccccsssseessesesees 3-38
Replacing the Treble Contact Board oc eceeseteeeeereees 3-39
Removing the Bass Contact Board ........eeseeeereteeerenes 3-39
Replacing the Bass Contact Board oo... cssseeseeeeseseeees 3-39
Removing the Keyboard Contract Strips ..0..... cesses 3-40
PIU 301A scstsaaiasesessddens sacstoeecciiets oat bass saitiiaiiun waunpondinens bine 3-40
Replacing the Keyboard Contact Strips .0.....essseeteneeeeee 3-41
Removing a Key Weight <sscsssssisssecveserssceseunentesdsausconssderadeounels 3-41
PPV UAY SS Vo aca s3hd Boba a char dosaanas ted cheahenar se seae aul aclstacaials 3-42
Replacing a Key Weight ss ssceaicinasissciaicauidewiass 3-43
PC88 Service Manual
vi

Chapter 4, Troubleshooting
INtFOCUCHOR ake see iae eed ace erent
CUSIOMET'S SOUPS saci iesguddeativeenrineeniarntrdneilntedeenles tars
DA VINE DCLUPS ated culver neck ties onnue eel ateneoa meaaie ae
Surface-Mount Devices ........ccccccsccesssscesssecessseceesseceesesseeeesseeees
PE88 RESCtS iscsi hd ieetuiis desactnse er cli Sastre dana’
FAVA ROSCOE ay cdvsschicdonctandbeslaczaccdsiua sharpie tie ouadidelersonentans
SOL IRESEE a iiasakeiges sa vsuescee caatateea otha lus aan oon neaestees
POWeE PLODlOMIS: sitecc chine heeds oaado sedis eae assaeses
Front Panel Problem ..........:..ccccccccccccesessscsecsesesserssscceceecsceccssteees
AUIGIO PLODIEINS wc sioelewchee. eeatckeh ethevee cas enssiat ese AL aeeeaaxs
Internal Sound Problems .............cccccccccsssssssscecceaseseecceesessnsessassees
Keyboard Problems ..........:ccccsseceeseeeees Stes iaeiete tae tent 4
BAUteLy savesuviaisostiaissi dear choaddsdeduchssobasisnesiinscantevedeectesitnensiinauasenetoe@es 4
Removing/Replacing the Battery ...........ccccceeeseeeeenees 4
PEWMIIOLS idea sesvesidevibavas st duaesttass urna dadendiders Ginnie mutase ea tiuies 4
INLEFCOMME CE: Dia PANY exesatpsagcseszass st ansosbadedeuneopaatangastapianoe amamneennns 4
Engine Block Diag@raimy, ..2.secsedesn ta sieeeaniois enlace niie anal eadeceeaeies 4
Table, 37451 Microcontroller ............cccccccccsccccescscessssccssseeseerseees 4
TOS POU Ss rare a hee yi stes cecsse deo RGPaae eae ives ates nea aan 4
Chapter 5, Parts Lists
Tf BO ats 4osechasesheresnstsadanecsesunstadvaccay epdecestis aaspactaues eal aeuachadns dawaatsos
Main Control Panel Board ..........ccccsssccsstecsssssccesneceessceseseersesaees
Slider -BOarG -sesiicduateinstoctaweonaead wa eactai aanceiac carat oes
TCD BOAR hes susteastiotiecccessdotease vet etinea sarees ates Rise Sa viosiadenaiad ereeneks
Engine Board: (DIP) sistent cosaasecaltiatesshnandraieandies
Engine Boatd (SMD) ssc.icciscs. dsc vctianencesgi nadia ieee hci yasataes
Wheels ASSEMBLY is cdescsh sans. serasdebsiertteassesiatatocustedoresiadienoiaencasisers
Keyboard Assembly .i.c.dascsssntiinghisaieaieiadsantianieneiieabeicvases
AIG situa cats ad Catnters ree esau e Neuter tos etaaint ar aueevauceuaCurhiian anmenatatiee
CaSE/ ENClOSU FC ei ieii actu cressaiierictad asad totes Mesa Filede tease teth eet
Par W Al aco tess ws ccsetuarecdeseadecedsDeacheasildetestuetreassiis eutiwass vandern iadeusus
Miscellaneous: a2icesii ction iabccstal de sunicestsestiaandsdhibieiitiade erent
PC88 Service Manual
voli

Chapter 6 Schematics
TO
Board
SHOGt
1
iss. tivc
cache
supers
erie:
che
arnc
ees
dial
Sook
viteameet!
6-3
I/O
Board,
Sheet
2
......cccccccsscsscsssscscseccsscsecsesscssesssscssccesesescessusees
6-4
Main
Control
Panel
Board
.0.....ccccccceecessscsecceccessssseesceasseccsssseees
6-5
DOOR
BOA
sii.
Giietced
ax,
crietsn
Latvape
ead
sndototaetincaaeid
seasote
eke
decdoantindss
6-6
Engine
Board,
SHEGt
ai.
tstb
sound
av
uecesd
veer aiva
decile
vsseestiiatblsay
6-7
Engine
Board
Sheet,
2
aiecsscavehciereeteewsarsnnd
lssdcicaationtine
mlaieslane
6-8
Engine:
Board,
SHEGES
sssiscssiteetss
eins
duardessernssanaesmastaiecibasyieetss
6-9
Engine:
Board,
Sheet
4
is
tices
actaciueslosisesauda
asian
tases
6-10
Engine:
Boards
SHOES
cist
casas
oss
Seales
vars
cud
hcng
sdentees
ceatidactseeoadacd
6-11
Engine
Board,
Sheet
6
........scseccscssssssssssscscsssscssssssscsecscescsssseecesers
6-12
VGM
Board,
Sheet
1
.....ccccscccccsceccesceccescsssescescsscsssssscsscssceesseees
6-13
VGM
Board,
Sheet
2
u.....ccccccccscsscsscsscsscsscescescsscessesessesscssssscessees
6-14
VGM
Board,
Sheet
3
o.....ccccecccsscsscsscsscssceccsscescessescsccssessesesssscnenes
6-15
VGM.
Board,
Sheet
4
isiccasica2itocd
apedte
vetted
eine
Nevins
daioneticsce
Sled
6-16
VGM
Board,
SHG6t
5
xsessscsossiicermrceaniuadeesiveddccossom
abcess!
6-17
WReeIS
Boat
esi
jeg
sccdeGucesxtindee
sedakadpapives
naedovcauciieltadtet
wench
ews
ase
6-18
I
PC88
Service
Manual
viti

Young Chang Distributors
Contact the nearest Young Chang office listed below to locate
your local Young Chang/ Kurzweil representative.
Young Chang America, Inc.
13336 Alondra Boulevard
Cerritos, CA 90703-2245
Tel: [phone]
Fax: [phone]
Young Chang Akki Co.
Kang Nam
P.O. Box 998
Seoul, Korea
Tel: [phone]
Fax: [phone]
Young Chang Akki Co., Ltd., Europe
Industriering 45
D-4060 Viersen 11
Germany
Tel: [phone]
Fax: [phone]
Young Chang Canada Corp.
395 Cochrane Drive
Markham, Ontario L3R 9R5
Tel: [phone]
Fax: [phone]
PC88 Service Manual
ix
~~

Specifications
Physical
. Height:
¢ Width:
*Length:
eWeight:
Electrical
Voltage Range:
Frequency Range:
Input Voltage:
Power Consumption:
Environmental
Temperature (Operating):
Temperature (Storage):
Relative Humidity
(Operating and Storage):
Audio
Output Connection:
Impedance:
Output Level:
Dynamic Range:
45/16" (10.95 cm)
14" (35.6 cm)
545/16" (137.95 cm)
55 Ibs. (25 kg)
120 VAC 240 VAC
100-125 Volts RMS 200-250 Volts RMS
48-65 Hz 48-65 Hz
9.5 Volts AC 9.5 Volts AC
2.0 Amps max 2.0 Amps max
40 to 104° (5 to 40°C)
-13 to 185°F (-25 to 85°C)
5 to 95%, non-condensing
2x 1/4" Mono Phone Plug
2K Ohms
3.5 Volts RMS Max, 1 Volt RMS Nominal
>103 dB "A" Weighted
PC88 Service Manual
x