Yamaha SY-77 User manual

•CONTENTS (S>^)
SPECIFICATIONS 2
PANEL LAYOUT !•) 4
CIRCUIT BOARD LAYOUT (^--y I- h) 6
BLOCK DIAGRAM {-^ u-j 97^7L.) 8
DISASSEMBLY PROCEDURE 10
ASSEMBLY PRECAUTIONS 15
LSI PIN DESCRIPTION 17
1C BLOCK DIAGRAM Ocya-y^m) 23
CIRCUIT BOARDS (->-t-»^5EI) 25
ERROR MESSAGES (x-7-> -y-b-v) 44
TEST PROGRAM (t^:^ I- ^^7 A) 48/72
MIDI DATA FORMAT (MIDI t'- 5?7 ;r-V'y h) 94
MIDI IMPLEMENTATION CHART 111
PARTS LIST
YAMAHA CORP.
HAMAMATSU. JAPAN
2.27K-885 ©Printed in Japan '90.01
SY77

SY77
SY77
IMPORTANT NOTICE
This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It
has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha
Products, are already known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product
may result in personal injury, destruction of expensive components and failure of the
product to perform as specified. For these reasons, we advise all Yamaha product owners
that all service required should be performed by an authorized Yamaha Retailer or the
appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute
authorization, certification, recognition of any applicable technical capabilities, or
establish a principle-agent relationship of any form.
The dau provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The
research, enpneering, and service departments of Yamaha are continually striving to improve Yamaha
products. Modifications are, therefore, inevitable and changes in specification are subject to change without
notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor’s
Service Division,
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your
body may have accumulated by grounding yourself to the ground buss in the unit (heavy
gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck aM work before
you apply power to the unit.
This product uses alithium battery for memory back-up.
WARNING: Lithium batteries are dangerous because they can be exploded by improper handling.
Observe the following precautions when handling or replacing lithium batteries.
•Leave lithium battery replacement to qualified service personnel.
•Always replace with batteries of the same type.
•When installing on the PC board, solder using the connection terminals provided on the battery cells.
Never solder directly to the cells. Perform the soldering as quickly as possible.
•Never reverse the battery polarities when installing.
•Do not short the batteries,
•Do not attempt to recharge these batteries.
•Do not disassemble the batteries.
•Never heat batteries or throw them into fire.
ADVARSEL!
Lithiumbatteri. Eksplosionsfare.
Udskiftning ml kun foretages af en sagkyndig, og som beskrevet iservicemanualer.
1

SPECIFICATIONS
*Tone generator:
•Keyboard:
•DSP effects:
•Sequencer:
•Memory:
•Controllers:
•Display:
•Terminals:
•Power requirements:
ePower consumption;
•Dimensions;
•Weight:
•Output level:
•Accessory:
Realtime Convolution and Modulation (RCMl
AWM2; 16bitlinear waveform data, maximum 43l< Hz
sampling frequency
AFM: 6operators, 45 algorithms, 3feedback loops,
16 waveforms, modulation from AWM output
Filter; Time variant MR (infinite Impulse response!
digital filters, 2filters for esch element (maximum of
8fillers per voice)
Maximum simultaneous notes: 16notes AWM -f 1
6
notes AFM
Maximum simultaneous timbres; 16
Note assignment; Last note priority, DVA (dynamic
voice aiiocation)
61 notes, ksy velocity sarrsitivity, channel aftertouch
(reverb effeci+moduiation effect) >2
Reverb effects: 40 types
Modulation effects: 4types
Tracks: 16(15tracks+l pattern track)
Songs: 1
Resolution: 1/96 of aquarter note (for internal clock)
Maximum simultaneous notes: 32
Capacity: approximately 16,000 notes
Panetns: 99
Recording: realtIme/step/punch In
Preset memory: 128 voices, 16multl$
Internal memory: 64 voices, 16 mulds
Waveform memory: 2Mwords (4 Mbytes), 112
sounds
Card slots; synthesizer data *1,waveform data x1
Disk: 3.5" floppy disk drive
(713K byte formatted I
Wheels; PITCH, MODULATION 1, MODULATION 2
Slider: OUTPUT 1, OUTPUT 2, DATA ENTRY
Knobs: LCD contrast, click volume
Dial: data entry dial
Panel switches: MODE x5, EDIT/COMPARE, COPY/
SAVE, EF.BYPASS, SEQUENCER x7, SHIFT, function
x8, EXIT, PAGE <>, JUMP/MARK, cursor AV
<3 >, -1/NO, +1/YES, numeric keypad 0-9,
MEMORYX4, BANKx4, voice selectxl6
LCD: 240 X64 pixels (backlltl
LED; red X11, red/green x21
Audio output; OUTPUT 1(L/MIX, L/MONO, R/MIX R),
OUTPUT 2(L, R), PHONES Controller: BREATH, FOOT
V(XUME, FOOT CONTROLLER, SUSTAIN, FOOT
SWITCH
MIDI; IN, OUT, THRU
U.S. &Canadian models: 120V
European &Australian models; 220-240V
U.S. &Canadian models: 28W
European &Australian modela: 28W
1046 (W)x407 (D)x119 (HI mm
17kg
Headphones: -IdBm
Output terminals: -lOdBm
Flopply disk (3.6 inch) xi
Plug cover x1

SY77
AWM2 :
AFM
7-f Jl-?-
S«»it
•a s
•I7i77-^"f 7"
i;a-7s
^-7i U-— •> a:
•->—>>••)•-
•J>9
'<9-y&
assst
•T’y-fe'y I- ij -
»< :
•33- K7D 2< h
•3.5-f y^FDD
•Wheal
•77-f5'-^i;i-A :
•-?g-3<ij i-i, :
•j'-f+A.
:RCMg’iSi
(Realtime Convolution and
Modulation)
:lecv 1-
»ft:*:48kH2
h)IC'3Slt73'-7' 12
dBWf'i’ ?/i-7 ^;u 3- -S2fliffiiR
457>y^')Xi.^ 3mUi
7^-K'<-/7. ISiftW
AWM2co,^:ijS)f#lc J:
h)(C'03l^7:?-r 12
dBi?)7'i3?7U7^3U?-$ 2(H4Se
:<
X
:*7^;u ?-IS LPF.HPFW«01!5
1
•C8, ^cott-S-StcJ: 0BPF-?D-/u;r
724dB<^LPF tLX 6ffill =filg
uy+vxsrsxsffiwsixt^/t-
AWM2 :16ff +AFM :16Sf
16
«t«a. DVA
f-«3
3^Kc
:40:?'f7‘
:4y-4r
16 h7y7(t-tfy’7 -> h7771)
1
J/96(FJffi7D /7lt)
32
I'neooo*
99
')7iy9A^!XT-j-7l'^>7‘{>
iK-t X:128 +-5’;i'f :16
4<-<X :64 +-7>t-f- :16
2M7- K(4My'--^ 1)
*SffEfx92
UX2.X20
:taytxy-ysxi
MCD64 :l''-3'7
»ly‘77 :64-'K'( X+lS7’;i-t+ l‘>
XrA K512K7- K)
1( 7t—77 Hi#713KB)
e-yf-'X yK, ti>i k-->3 €
‘y —y 3yz
:77 ^7 yI- d<il 0.-2.1 -2, ?'-7i,
>(-')-
:LCDs >)• n-/u. 7') /7iK>) '
:r-9x.y hij-
•/<:f;ux-1' 77" Mode
Edit
Effect bypass
Memory select
Bank select
Voice select
Page
T-y^~
Data Entry
33 —yjp
Function
Sequencer
•LCD
LED
•e^m*
•Y7^y
•ay kQ--7 —
•MIDI
•'^yY7tyHity'<ii-
•t-;£
•Is
•# E &
:5Voice, Multi, Song, Pattern, Utility
:2Edit/Compare, Copy
.1
:4Preset 1, Preset 2, Internal. Card
:4A~D
:16 1~16
;3 Page +,Page-, Jump/Mark
:12 0~9, Enter, -
;2 Inc, Dec
:4 I
:10 Function 1-8, Shift, Exit
;7Run, Stop, Rec, Top, Rew, FF,
Auto, Locate
;240X64Dots(yf v75-( H43)
:Red XU
:Red/Green x21
;4Output ICL/Mix L/Mono, R/Mix
R), Output 2(L,R)
:1
i6Foot control, Foot volume, Foot
switch, Sustain switch. Breath
control
3 IN, OUT. THRU
-IdBm
-lOdBm
lOOV
20W
1046 (W) X407(D) xll9CH)mm
17kg
-7'"Ef’^ X71«C
(3.5-f >-? 70-y b'-f'y X7)
:ms
3
SY77

0
oSQ iSJCSCiD
mm

SY77

SY77

SY77
DISASSEMBLY PROCEDURE
1.
Bottom Cover Assembly (refer to fig. 1.)
1-1. Remove the nineteen (19) screws ®(4.Ox
10 bonding head tapping screw), the Bottom
cover assembly can be removed.
This will give you access to the DMI, DM2,
PS circuit boards. Floppy disk drive unit and
Wheel assembly.
2. DMI Circuit Board (refer to fig.2|
2-1. Remove the Bottom cover assembly, (see
procedure 1.)
2-
2. Remove the six (6) screws ®(4.0 x10 bind
head tapping screw], the DMI circuit board
can be raised.
After the connectors have been disconnected,
the DMI circuit board can be taken out of
the unit completely.
3. DM2 Circuit Board (refer to flg.2|
3-
1. Remove the Bottom cover assembly, (see
procedure 1.)
3-
2. Remove the six (6) screws ©(4.0 x10 bind
head tapping screw), the DM2 circuit board
can be raised.
After the connectors have been disconnected,
the DM2 circuit board can be taken out of
the unit completely.
4. PS Circuit Board (refer to fig. 2.)
4-
1. Remove the Bottom cover assembly, (see
procedure 1.)
4-2. Remove the screw ®(4.Ox 10 bonding head
tapping screw) to remove the AC panel.
4-3. The PS circuit board can be removed by re-
moving the four (4) screws ©(4.0 x10 bind
head tapping screw) and disconnecting the
connectors.
1. mmAss-y <7)9^ i:fj (mi#®)
1-1. vJ19-2t^(4 h4-x)
2, DM 1•>- (H 2#B5)
2-1. H^gAss'yS-^Li-f. (UK#.#.)
2-
2. 6:^(4 xIO-'nM >t
3, DM2 (EI2#B§)
3-
1. JStSAss'ytJT-Lif,
3-
2. 6#(4 xIO'n'T t,
4, PSix- h<7)^(,:*t (112#BB)
4-
1. lifijAss'yS-Jd-LJ-t-. (IIR#,#)
4-2. 1#(4 xio^ior-f yi7Bf''f h4-y)
4-3. y42fs(4 >K? Vb.
10
SY77

SY77
SY77
I
5. Power Transformer (refer to fig. 2.)
5-1. Remove the Bottom cover assembly, (see
procedure 1.)
5-2. Remove the PS circuit board, (see procedure 4.1
5-
3. Remove the two (2) screws ©(4.0 >: 10 bind
head tapping screw) to remove the Power
transformer.
6. Floppy Disk Drive Unit (refer to fig. 2and fig. 3)
6-
1. Remove the Bottom cover assembly, (see
procedure 1.)
6-2. Remove the three (3) screws ©(4.0 x10 bind
head tapping screw) and disconnect the con-
nectors, the Floppy disk drive unit can be taken
out of the SY77 unit.
6-3. To remove the FDD holder from the Floppy
disk drive unit, remove the four (4) screws ®
(3.0x6 bind head tapping screw).
5. (ia2#SiO
5-1. (£1SAss'yS-HL*1-o
5-2.
5-
3. 2^(4 xlO/<^- >Kj? yy) i
6. FDDCOfl-b:^ (132, 3#M)
6-
1. SISAss'y^J^Lito
6-2.yt
FDD Ass’y^SstO^hLJI-o FDD
X6'<-f >
LTKOJtLSI-,
7. CARD Circuit Board (refer to fig. 4)
7-1. Remove the Bottom cover assembly, (see
procedure 1.)
7-2. Remove the DM1 circuit board, (see procedure
2.)
7-
3. After the three (3) screws ®(4.0 x10 bind
head tapping screw) have been removed, the
CARD circuit board can be removed.
8. JKAN Circuit Board (refer to fig. 4and fig. 5)
8-
1. Remove the Bottom cover assembly, (see
procedure 1.1
8-2. Remove the DIV11 and DM2 circuit boards.
(see procedures 2and 3.)
8-3. Remove the ten (10) screws ®(4.0 x10bond-
ing head tapping screw) on the rear panel and
three (3) screws ®(4,0x 10 bind head tapping
screw), the JKAN circuit board can be removed.
7. CARD->- K7)^f^ (S4#ff§)
7-1. mSAss'yS-tfLJto
7-2. DM1
b
(2iS#M)
7-
3. ®OT->’3^{4 X10.'-‘M >K:? •/ t.
8. JKAN->- (04. 5#SS)
8-
1. IgtSAss’y^-HLSt. (l<M#ffi)
8-2. DM1 •>- I- tDM2 X- b5-51-Lato
8-3. 35b:(4 xlO^M >V^-y v) i,
ij j: 0±rtt'i'4®7)4-yi0’ls(4 xio
11

SY77
9. Keyboard Assembly (refer to fig. 6.)
9-1- Remove the Bottom cover assembly, (see
procedure 1.)
9-2. Remove the DM! and DM2 circuit boards,
(see procedures 2and 3.)
9-3. Remove the PS circuit board, (see procedure 4.)
9-4. The Keyboard assembly can be removed by
removing the five (5) screws (4.0 x10 bind
head tapping screw) and four (41 screws ®
(4.0 X16 bind head tapping screw).
9- SMAss’ycO^L::? (0 6#.^)
9-1. fi^StAss’y^nLi-r.
9-2. DM1 V- ftDM2 h
9-3.
9-4. 5i=(4 xlO^'M >'X •>') t
4^U yVf -/ S:
Tt-L-rmO^LSi-o
dig. 6)
10. PNAB and PNC Circuit Boards (refer to fig. 4
and fig. 7)
10-1. Pull out the konbs on the Control panel.
10-2. Remove the Bottom cover assembly, (see
procedure 1.)
10-3. Remove the DM1 and DM2 circuit boards,
(see procedures 2and 3.)
10-4. Remove the PS circuit board, (see procedure
4.)
10-5. Remove the JKAN circuit board, (see proce-
dure 8.)
10-6. Remove the Keyboard assembly, (see proce-
dure 9.)
10-7. Remove the fourteen (14) screws ®> (4.0x
10 bind head tapping screw) to remove the
Center angle bracket.
10. PNAB->- I- tPNC->- |-d>9f L'^ (04.7#fiH)
10-1. 9, X9T Kd^'J =
10-2. (e1SAss’y5-?l-Lt1-,
10-3. DM1
h
kDM2
(2 13il#.aa>
10-4. psi'- )• ^51-Lgt.
10-5. JKAN->- 1- ?-ld-Lito (8i«#.fS)
10-6- aSSAss’yi-^t^ t. (9»0#M)
10-7. ®c^d--xl4>k(4 xio^n'T VK:? •/ y)
i^LT, 4iyf’-ry-7’>l'i:M')9VLt-r,
12
SY77