Korg Poly-800II User manual

PROGRAMMABLE POLYPHONIC SYNTHESIZER
P0LY-800E
SERVICE
MANUAL
CONTENTS
1. TECHNICAL SPECIFICATIONS 1
2. MIDI IMPLEMENTATION 2
3. STRUCTURAL DIAGRAM 13
4. BLOCK DIAGRAM 16
5. CIRCUIT DIAGRAM 17
6. P.C. BOARD 20
7. CIRCUIT DESCRIPTIONS 23
8. CHECK AND ADJUSTMENT
PROCEDURE 26
9. PARTS UST 29

1 TECHNICAL
1.
KEY
C~C49Keys
2. MASTER OSC
After power ON
Variation after 0-10 min.: within ±5 cents
Variation after 10 min.~1 hr.: within ±5 cents
Temperature characteristics 0-40°C within ±10 cents
3. MASTER TUNE
#MAX +40-70 cents
bMAX ^40-70 cents
4. DCO
OCTAVE: LOW, MID, HIGH
WAVE FORM: f\ 16'+ 1/2 8' + 1/4 4' + 1/8 2'
JT_ 16' + 8' + 4' + 2'
LEVEL: 0-31 32 steps
DCO 2 INTERVAL: 0-12 half-steps 13 steps
DETUNE: 0-3
0, 6.5, 13, 26 cents 4 steps
5. VCF
24 dB/OCT LPF
CUT OFF: 0-99 half-steps 100 steps
RESONANCE: 0-15 (Q=0-10) 16 steps
KBD TRACK: 0, 50, 100%
POLARITY:/S , W
EG INT: 0-15 16 steps
CUT OFF - 0- ±10 OCT (±20%)
TRIGGER: SINGLE/MULTI
6. NOISE
0-15 16 steps
7. EG
0-31 32 steps
8. MG
0-15 16 steps
9. DCO MOD
BEND : 0 - ± 730 cents (± 30 cents)
MG : 0- ± 160 cents (±40 cents)
MG (JOYSTICK): 0- ± 160 cents (±40 cents)
10. VCF MOD
MG:0-±10 2/3 OCT (±10%)
MG (JOYSTICK): 0- ± 10 2/3 OCT (± 10%)
11. EQUALIZER
TREBLE: -6-0- +6 (13 STEP) ±10 dB (±20%)
±3 dB POINT:
2 kHz (±10%)
BASS: -6-0- +6 (13 STEP) ±10 dB (±20%)
±3 dB POINT:
300Hz(±10%)
12. DIGITAL DELAY (DDL)
DELAY TIME: 0-99 (100 STEP) 4 msec-1024 msec
FEED BACK: 0-15 (16 STEP) 0-100%
(until oscillation ceases)
MOD FREQUENCY: 0-31 (32 STEP) 0.1 Hz-10 Hz
(±20%)
MOD INTENSITY: 0-31 (32 STEP) 1 - 5 TYP
(1=8 MAX)
EFFECT LEVEL 0-15 (16 STEP) 1 - 1 max.
Effect sound produced
13. SEQUENCER
1 note, rest or tie regarded as 1 step
maximum of 1,000 steps
SPEED: 1 step regarded as ")T
"J" . 25-250 ±20%
MODE: ONE TIME/REPEAT
14. TAPE INTERFACE
DATA TRANSMISSION SPEED: approx. 2,000 (bit/sec)
OUTPUT LEVEL: 4.5 mVp-p
INPUT LEVEL: HIGH 3 Vp-p
LOW 1 Vp-p
15. MIDI
CHANNEL:!-16 CH
PROGRAM CHANGE: DISABLE/ENABLE
SEQUENCER CLOCK: INT/EXT
SOCKET: IN/OUT
16. DIMENSIONS
780(W) x 286(P) x 87.6(H) mm
17. WEIGHT
4.4 kg (including dry-cell batteries)
18. ACCESSORIES
Pre-load data tape
Batteries (UM-2x 6)
Shielded cord (2.5m x 1)
19. POWER CONSUMPTION
7 W (when using AC adapter)
SUM-2X6 9 V 330 mA ±10%
20. BATTERY LIFE
3.5 hrs. or over (National Hi-Top SUM-2x6, continuous
usage, 20°C)
21. EXTERNAL DC POWER RANGE
+ 7.0V - + 11.0V
22. ENVIRONMENTAL CONDITIONS
Temperature: 0°C-40°C
Humidity: Below dew point
23. TIME TO STABLE OPERATION AFTER POWER ON:
300 sec.
24. PERMISSIBLE LINE NOISE VOLUME
(with AC adapter)
5 min. marked without malfunction at positive polarity
90°, 350 ns, 500 V pulse
25. ELECTROSTATIC TEST
Normal function at 10 kV of static electricity
26. ENCLOSURE HEAT BUILD-UP
15 or less
27. AT POWER ON/OFF
spike noise — less than 300 mVp-p
28. OUTPUT LEVEL (Line Out)
C4-C5 8 notes output simultaneously, VOL MAX,
-6dBm (±3dB)
29. NOISE LEVEL
JIS-A AVERAGE
GATE ON
DDL ON -76 dBm TYP
(-70 dBm MAX)
DDL OFF - 80 dBm TYP
(-74dBmMAX)
GATE OFF
-90 dBm TYP
(-84 dBm MAX)
-90 dBm TYP
(-84 dBm MAX)
30. ELECTRICAL WAVE INTERFERENCE
FCC (U.S.A.)
VDE (W. Germany)
Certification for each under review.

1. TRANSTITTED DATA
Q CHANNEL MESSAGES
I 0 0 0 n n n n
I 0 0 I n n n n
I 0 I I n n n n
I 0 I I n n n n
I I 0 0 n n n n
I I I 0 n n n n
Okkk kkkk
Okkk kkkk
OOOO 0 0 0 I
0 0 0 0 0 0 I 0
Oppp pppp
0000 0000
0 I 0 0 0 0 0 0
0 I 0 0 0 0 0 0
Ovvv vOOO
Ovvv vOOO
Ovvv vvvv
Note Off
k k k k k k k =36-84
Note On
k k k k k k k =36-84
DCO Modulation
(4bit resolution)
VCF Modulation
(4bit resolution)
Program Change
P P P P P P p=0~63 (NOTE I )
Pitch Bender Change
(7bit resolution)
v v v v v vv =64 : Center
LSB is not used
• nnnn = 0~15: The channel number set in parameter 87. But sequencer data is fixed at channel 2.
NOTE
1. The relationship between MIDI program numbers (Oppppppp) and display program numbers is shown here.
Display number MIDI Program number
#n ^°
#12 *i
#87-
#88-
—62
— 63
SYSTEM REAL TIME MESSAGES
I I I I I 000
I I I I I 0 I 0
I I I I I I 0 0
Timing Clock
Start
Stop
* Sent only during sequencer operation.

B SYSTEM EXCLUSIVE MESSAGES
©DATA DUMP
I I I I 0 0 0 0
0 10 0 0 0 10
0 0 10 0 0 0 1
0 0 0 0 I I 0 0
0000 dddd
0000 dddd
0000 ssss
0000 ssss
1 M I 0 I I I
Exclusive Status
KORG ID 42H
Format ID 2IH
POLY-800II ID OCH
LSB 4bit t)it|
t)iti
. RAM data I word
MSB 4bitJ (5376 Byte)
LSB 4b.tj
MSB 4biti
EOX
(N0TE2)
• DATA DUMP is sent only when a DATA DUMP request is received.
NOTE 2688
2. The 2 (RAM data 1 word)n least significant 8 bits are check sum data.
DATA ERROR
I I I I
0 I 0 0
0 0 I 0
0 0 0 0
0 0 I 0
I I I I
0 0 0 0
0 0 I 0
0 0
0 I
I I 0 0
0 0 0 0
0
I I I
Exclusive status
KORG ID
Format ID
POLY-800H ID
Data Error
EOX
42 H
2IH
OCH
20 H
• Sent only when a check sum error occurs during a data dump.

2. RECOGNIZED RECEIVE DATA
I CHANNEL MESSAGES
10 0 0 n nnn
10 0 1 n n n n
10 0 1 n n n n
1 0 1 1 n n n n
1 0 1 1 n n n n
1 0 1 1 n n n n
110 0 n n n n
1 1 1 0 n n n n
Okkk kkkk
Okkk kkkk
Okkk kkkk
0 0 0 0 0 0 0 1
0 0 0 0 0 0 10
0 1 1 1 1 1 0 0
0 I 1 1 1 1 0 1
Oppp pppp
Oxxx xxxx
Oxxx xxxx
Ovvv
vvvv
0000 0000
Ovvv vxxx
Ovvv vxxx
0000 0000
0000 0000
Ovvv vvvv
Note Off (NOTE 1)
Velocity will be ignored
Note On (NOTE 1)
Velocity will be ignored
(v v v v v v v>0)
Note Off
DCO Modulation
(4 bit resolution)
VCF Modulation
(4 bit resolution)
OMNI Mode Off
OMNI Mode On
Program Change (NOTE 2)
Pitch Bender Change
LSB will be ignored
MSB will be recognized
v v v v v v v=64Icenter
• nnnn = 0~15: Channel number set in parameter 87. When OMNI mode is ON, all messages are received,
regardless of channel number setting.
When OMNI mode is OFF, the synthesizer responds only to messages received on the currently
selected channel number.
The "power on" default is OMNI ON.
NOTE
1. Note number (Okkk kkkk) = 36-84. Received data beyond this range is voiced as the same note in the nearest oc
tave within the range.
2. Program number (Oppp pppp) = 0-63. Data higher than 63 is interpreted as the difference obtained by subtracting
64 from the data.
SYSTEM REAL TIME MESSAGES
I I I I I 000
I I I I I 0 I 0
I I I I I I 0 0
Timing Clock (NOTE 3)
Start
Stop
NOTE
3. Timing clock data can be received only in the period between reception of start and stop data.

El SYSTEM EXCLUSIVE MESSAGES
©DATA DUMP
I I I I 0 0 0 0
0 10 0 0 0 10
0 0 10 0 0 0 1
0 0 0 0 I I 0 0
0000 dddd
0000 dddd
0000 ssss
0000 ssss
1 I.I I 0 I I I
Exclusive status
KORG ID 42 H
Format ID 21 H
POLY-800H ID OCH
LSB 4bir bit!
bit!
. RAM data I word
MSB4bitJ (5376 Byte)
LSB 4bit |
MSB 4bitJ
EOX
Check Sum data (NOTE 4 )
NOTE
4. The 2* (RAM data 1 word)n least significant 8 bits are check sum data.
n = l
®DATA DUMP REQUEST
I I I I
0 I 0 0
0 0 I 0
0 0 0 0
0 0 0 I
I I I I
0 0 0 0
0 0 I 0
0
0 0 I
I I 0 0
0 0 0 0
0 I I I
Exclusive status
KORG ID
Format ID
POLY-800H ID
Data Dump Request
EOX
42 H
2IH
OCH
I0H
• After receiving a DATA DUMP REQUEST, there is a delay of about 300ms before the POLY-800II begins DATA
DUMP transmission.

3. USING SYSTEM EXCLUSIVE MESSAGES
I Communication between the POLY-BOOH and a computer.
I The POLY 800II can send and receive the following kinds of information via system exclusive messages. This
enables sequencer and other data exchange with a computer equipped with a MIDI interface and suitable
software.
Sending
DATA DUMP: This includes the sound data stored in the 64 programs in memory, sequencer data, settings of
parameters 85, 86, 87, and 88, and chord memory data. This is sent in response to a DATA DUMP
REQUEST.
DUMP ERROR: Sent when a check sum error occurs during reception of DATA DUMP data.
Receiving
DATA DUMP: The program data loaded to the POLY-800II. The contents of this data replace the sound
data stored in the 64 programs in memory, sequencer data, settings of parameters 85,86,
87, and 88, and chord memory data.
DATA DUMP REQUEST: A command to transmit program data. When this request is received, the POLY-800II begins
DATA DUMP transmission after a 300ms delay.
■ Setup is shown here:
Computer
OUT
MIDI Interface midi i
POLY-800II
I Communications Examples
3) First the computer obtains sound program and sequencer data from the synthesizer for editing. After editing,
the data is sent back to the synthesizer.
Computer
POLY-800U
Send
Receive
Receive
Send

If an irregularity is detected in the data loaded from the computer.
Computer
P0LY-800H
Send
Receive
Receive
Send
I RAM data structure
I The RAM data portion of DATA DUMP data is organized as shown here.
MIDI CHANNEL
SEO DATA
(UNDEFINED)
CHORD MEMORY
SEO MODE
SEO CKL
PROG CHANGE DIS/ENA
(UNDEFINED)
PROG DATA
0 0 0 H
0 0 1 H~ 3 E a H
3E9H-3F0H
3FIH-3F8H
3 F 9 H
3 F A H
3 F B H
3FCH-3FFH
400H-A7FH
1
1000
8
8
1
1
1
4
1664
I Actually, when this data is transmitted on MIDI, each byte is split at its least significant four bits and sent starting
from relative address 000H.
(UNDEFINED data does not affect internal operation; it is only used in the check sum.)
~7

RAM data organization
Bit map for MIDI CHANNEL, SEQ MODE, SEQ CLK, and PROG CHANGE
0 0 OH
3 F9H
3 EAH
3 FBH
MSB ?
0
0
0
0
6
0
0
0
0
5
0
0
0
0
4
0
0
0
0
3
-^
0
0
0
2
1
MIDI CHANNEL
0
0
0
0
0
0
o LSB
__ SEO __
^~MODE
„ SEQ m
_ PROG _
CHANGE
* Bit map relationship with parameter values on front panel.
MIDI CHANNEL
SEO MODE
SEO CLK
PROG CHANCE D/E
0 0 0 H
3 F 9H
3 FAH
3 FBH
b3—bO
bO
bO
bO
0000-1 1 1 1 = 1-16
0 = 1 (ONE TIME), 1 = 2 (REPEAT)
0 = 1 (INT), 1 = 2 (EXT)
0 = 0 (DISABLE), 1 = J (ENABLE)
87
85
86
88
I Sequencer data has the following structure.
f
J
i
00 H
01 H
02 H
1 k t ki ki ki k| ki ki
0 ki ki ki ki kj kj ki
0 kj k^ kj k; k? k^ k?
1 k3 kj k3 k3 k3 k3 k3
End
Rest
Tie
If most significant bit is 0: Other notes exist at same time.
If most significant bit is 1: Block end at that point in time.
Oknknknknknknkn: Same as MIDI note number.
/24H—54H,\
In = I —8 /
Example:
I CHORD MEMORY has the following structure.
Oknknknknknknkn: Same as MIDI note number.
00000000: End
Data: B4H, 02H, B5H, 02H, 01H, 01H, B7H, B9H, 34H, 37H,
BCH, 02H, 02H, 02H, 02H, 02H, 01H, 01H, 00H.
a>

Bit map for each program.
"•" Exceeds byte unit.
UNDEFINED data can have any value; it is only used in the check sum.