Roland JX-305 Operating and maintenance manual

JX-305 Sep. 1998
1
TABLE OF CONTENTS Page
Specifications ...............................................................................................1
Panel layout ...............................................................................................2
Panel Layout Patrs List ...............................................................................................2
Exploded view ...............................................................................................3
Parts list ...............................................................................................4
Identifying the version number ...............................................................................................6
Saving and loading user data ...............................................................................................6
Factory preset ...............................................................................................8
Upgrading the program memory software version ...............................................................................................8
Test mode ...............................................................................................9
Keyboard parts list ...............................................................................................16
Keyboard disassembly ...............................................................................................16
Block diagram ...............................................................................................18
Circuit board (MAIN) ...............................................................................................20
Circuit diagram (DIGITAL) ...............................................................................................21
Circuit diagram (SND_PWR) ...............................................................................................22
Circuit diagram (INTERFACE) ...............................................................................................23
Circuit board (PANEL A) ...............................................................................................24
Circuit diagram (PANEL A) ...............................................................................................25
Circuit board (PANEL B) ...............................................................................................26
Circuit diagram (PANEL B) ...............................................................................................27
SERVICE NOTES
First Edition
Issued by RJA
Copyright © 1998 by ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION.
17059943 Printed in Japan AA00 (DP) 1
MODULATION
BENDER
JX-305:GROOVESYNTH
●Keyboard
61 keys (with velocity and channel aftertouch)
●Tone Generator
Maximum Polyphony :64 voices
Parts :24 parts (8 + RPS:16)
Built-in Effects :Reverb, Delay, Multi-Effects (24 types)
Patches :Preset:640 User:256 Card:512
Rhythm Set :Preset: 32 User: 20 Card: 20
●Sequencer
Tracks :8 + Mute Ctrl
Songs :50
Preset Patterns :274
RPS Patterns :494
User Patterns :200 (Maximum)
Card Patterns :200 (Maximum)
Maximum Note Storage :approx. 75,000 notes (Internal)
:approx. 220,000 notes (2M Card)
:approx. 480,000 notes (4M Card)
RPS Set :60
Pattern Set :30
Tempo :20.0 - 240.0
Resolution :96 ticks per quarter note
Recording Method :Realtime, Step1, Step2
Quantize :Grid, Shuffle, Groove (71 types)
●Connectors
Output Jacks (L (MONO), R)
Phones Jack
MIDI Connectors (IN, OUT, THRU)
Pedal Hold Jack
Pedal Control Jack
Pedal Switch Jack
Memory Card Slot
●Display
LCD : 16 characters, 2 lines
Beat LED
SPECIFICATIONS
●Power Supply
AC Adaptor (DC 9V)
●Current Draw
450 mA
●Output Impedance
2.2 kΩ
●Dimensions
1,011 (W) x 289 (D) x 83 (H) mm
39-13/16 x 11-7 / 16 x 3-5 / 16 inches
●Weight
6.9 kg / 15 lbs 4 oz (Excluding AC Adaptor)
●Accessories
Owner's Manual Set (English) (PNo.71122389)
Owner's Manual Set (Japanese) (PNo.71011667)
Card Protector (PNo.01346312)
AC adaptor
ACI-100C (PNo.00905756)
ACI-120C (PNo.00905767)
ACI-230C (PNo.01018312)
ACB-230(E) (PNo.01458278)
ACB-240(A) (PNo.12449549)
●Options
Stereo Headphones :RH-20/80/120
Pedal Switch :DP-2/6, BOSS FS-5U
Audio Connection Cable :PJ-1M
:PCS-075W/150W/250W
MIDI Cable :MSC15/25/50
SmartMedia :S2M-5/S4M-5
JX-305
GROOVESYNTH

JX-305 Sep. 1998
2
PANEL LAYOUT
FRONT VIEW
REAR VIEW
[FRONT VIEW PARTS LIST]
No. Part Number Part Name
@- B 01452301 J R-KNOB SF BLK/LCG
@01453134 ROTARY POT. EVJY15F01A54
A01453412 ROTARY POT. EVUJFUFK1B14
B01565256 ROTARY POT. EVUJFYFK1B14 with CENTER Click
C, E- M 01340290 TACT SW. EVQ11A
D00899023 LED LNJ282RKRXE
E, F, H, J, K, M 00348490 LED SLR-325VCT31 (RED)
G00560745 LED SLR-325MCT31 (GREEN)
O15029342 LED GL3ED8 (2 COLORS)
C00900189 D S-KEYTOP SX1H BLK
E00900145 D S-KEYTOP SD1H BLK
F00900156 D S-KEYTOP SD2H BLK
G22495277 D S-KEYTOP MD1H BLK
H01013023 D S-KEYTOP SD1H DRD
I00900190 D S-KEYTOP SX2H BLK
J00900167 D S-KEYTOP SD3H BLK
K22495278 D S-KEYTOP MD2H BLK
L22495275 D S-KEYTOP MX2H BLK
M22495272 D S-KEYTOP MD4H BLK
N01129334 LCD DM1628-0AUB
P22485303 D R-KNOB L BLK 248-303
01013223 ENCODER EVQ VEM F01 24B
PANEL LAYOUT PARTS LIST
[REAR VIEW PARTS LIST]
No. Part Number Part Name
@01343101 D C-ESCT BX1H BLK
01341178 CARD CONNECTOR CN015S-3013-0
A13429274 MIDI JACK YKF51-5041
B00569278 JACK LGR4609-7000
C13449720 DC IN HEC2305-01-250
D22360712 CORD HOOK 236-712
E13149125 EST206B POWER SW
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wryi o y!0
!4!2 t!6!5 !7
u!1 !0 !3 !4 !4
eq w r ty

JX-305 Sep. 1998
3
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
EXPLODED VIEW
[PARTS]
No. Part No. Part Name
q01129334 LCD DM16280AUB
w01452201 TOP PANEL
e01452212 BOTTOM COVER
r01452223 SIDE PANEL R
t01452234 SIDE PANEL L
y01452245 DISPLAY COVER
u01452256 DISPLAY HOLDER
i01455990 DUST COVER
o12359139 FOOT FF-018 BLK
!0 13149125 AC SW EST206B 5A/125V
!1 22205900 PANEL HOLDER
!2 22360712 CORD HOOK 236-712
!3 71017078 BENDER PB-A0113
!4 71011689 SK-861-K KEYBOARD ASSY
!5 71011634 MAIN PWB ASSY
!6 71011723 PANEL A ASSY
!7 71017190 PANEL B ASSY
!8 01452301 J R-KNOB SF BLK/LCG
!9 22485303 D R-KNOB L BLK 248-303
[SCREW]
No. Part No. Part Name
A40011045 Binding Taptight B 2 X 6 ZC
B40011056 Binding Taptight B 3 X 6 ZC
C40011067 Binding Taptight B 3 X 8 ZC
D40011123 Binding Taptight B 4 X 8 BZC
E40011490 Double Sems 3 X 6 BZC
F40011512 Double Sems 3 X 12 BZC
G40011189 Pan Taptight P 3 X 8 ZC
H40011201 Pan Taptight P 3 X 8 BZC
I40239734 Binding Taptight VWH 3 X 6 ZC

JX-305 Sep. 1998
4
PARTS LIST
NOTE : The parts marked # are new (initial parts).
CASING
01343101 D C-ESCT BX1H BLK
# 01452201 TOP PANEL
# 01452212 BOTTOM COVER
# 01452223 SIDE PANEL R
# 01452234 SIDE PANEL L
# 01452245 DISPLAY COVER
12359139 FOOT FF-018BLK
22360712 CORD HOOK 236-712
CHASSIS
# 01343090 LED SPACER
# 01452256 DISPLAY HOLDER
# 01452323 ENCODER HOLDER
01455901 LED SPACER LH-36-9
# 01455990 POT DUST COVER
22205900 PANEL HOLDER
KNOB.BUTTON
00900145 D S-KEYTOP SD1H BLK
00900156 D S-KEYTOP SD2H BLK
00900167 D S-KEYTOP SD3H BLK
00900189 D S-KEYTOP SX1H BLK
00900190 D S-KEYTOP SX2H BLK
01013023 D S-KEYTOP SD1H DRD
# 01452301 J R-KNOB SF BLK/LCG
22485303 D R-KNOB L BLK 248-303
22495272 D S-KEYTOP MD4H BLK
22495275 D S-KEYTOP MX2H BLK
22495277 D S-KEYTOP MD1H BLK
22495278 D S-KEYTOP MD2H BLK
SWITCH
01340290 EVQ11A H=5.0 TACT SW
13149125 EST206B 5A/125V POWER SW
JACK
00569278 LGR4609-7000 STEREO JK2-7 on MB
13429274 YKF51-5041 MIDI JK1 on MB
13449720 HEC2305-01-250 DC IN JK8 on MB
DISPLAY UNIT
01129334 DM1628-0AUB LCD SHARP
BENDER UNIT
71017078 PB-A0113
KEYBOARD
# 71011689 SK-861-K KEYBOARD ASSY
CONSIDERATIONS ON PARTS ORDERING
When ordering any parts listed in the parts list, please specify the following items in the order sheet.
QTY PART NUMBER DESCRIPTION MODEL NUMBER
10 22575241 Sharp key C-20/50
15 2247017300 Knob (orange) DAC-15D
Failure to completely fill the above items with correct number and description will result in delayed or even
undelivered replacement.
Ex.
SAFETY PRECAUTION:
The parts marked have safety-
related characteristics.
Use only listed parts for
replacement.
MB : PWB MAIN ASSY
PA : PWB PANEL A ASSY
PB : PWB PANEL B ASSY
PCB ASSY
# E 71011634 PWB MAIN ASSY
# 71011723 PWB PANEL A ASSY
# 71017190 PWB PANEL B ASSY
IC 00127490 TC7W08F DUAL 2in AND IC29 on MB
00129278 SSC1080F0B KEYSCAN IC4 on MB
00897078 RA01-005 (TC170C200AF-005) CUSTOM IC6 on MB
00899812 LH28F800SUT-70 FLASH MEMORY BLANK IC1,7 on MB
# 01342390 UPD23C16000WGY-834-MKH 16M MASK ROM IC8 on MB
01342401 LHMN0PNH 64M MASK ROM IC3 on MB
# 01342978 TC160G22AF-1253 CUSTOM IC31 on MB
01344056 SI-8501L REGULATOR +5V IC27 on MB
01347745 TMS418169A-60 16M DRAM IC2 on MB
01347756 LH62800K-50 2M DRAM IC33 on MB
01451578 AK4324-VF-E2 DAC IC24 on MB
# 01455878 TC74AC574P OCT. D-F/F DIP IC4 on PA,IC1 on PB
# 01456856 BA10358F DUAL OPAMP SOP IC37 on MB
# 01564078 HD6437042AE32F CPU MASK IC5 on MB
# 01565201 LHMN5KWB WAVE MASK ROM IC9 on MB
15169605 TC74HC4052AP DUAL 4:1 ANALOG-MPX DIP IC2 on PA
15189186 UPC4570C DUAL OPAMP DIP IC3 on PA
15189249 BA10324A QUAD OPAMP DIP IC1 on PA
15199937 M51953BFP-600C RESET IC IC26 on MB
15249104 TC7S04F INV IC34 on MB
15249111 TC7WU04F TRI. INV IC16 on MB
15249125T0 TC74HC32AF QUAD 2in OR IC30 on MB
15259758T0 TC74HC175AF QUAD D-F/F IC32 on MB
15259769T0 TC74HC238AF 3 to 8 DECODER IC35,36 on MB
15259778T0 TC74HC245AF OCT. BUS BUFFER IC20 on MB
15259885 TC7S32F 2in OR IC11 on MB
15269219H0 HD74LS05FPEL TTL HEX INV(OPEN DRAIN) IC19 on MB
15289105 UPC4570G2 DUAL OPAMP SOP IC25 on MB
15289109 M5216FP-600D DUAL OPAMP SOP IC23 on MB
15289125 PC-410T PHOTO ISOLATOR IC18 on MB
15289402 TA78L05F REGULATOR +5V IC28 on MB
TRANSISTOR
00239801 DTA114EU DIGITAL Q3,10,14,15 on MB
00239812 DTC114EU DIGITAL Q5 on MB
00562012 2SC3265-Y Q13 on MB
01121278 2SA1576A Q1,2,11 on MB
01121289 2SC4081 Q4,6,7,12,30 on MB
# 01455934 RN1421 DIGITAL Q23-29 on MB
# 01567867 DTA144WUA DIGITAL Q10 on MB
15329505 DTC314TK DIGITAL Q8,9,21,22 on MB
DIODE
01016101 RD4.7S ZENER D2,3 on MB
15019126 1SS133 SWITCING
15339120T0 1SS302 ARRAY DA1-8 on MB
15339203 SFPB54 SCHOTKEY D4 on MB
LED00348490 SLR-325VCT31 RED
00560745 SLR-325MCT31 GREEN D28 on PA
00899023 LNJ282RKRXE RED LONG LEAD D8,12,15,23,27,29,38,42,43 on PA,D32-34 on PB
15029342 GL3ED8 2COLERS D24 on PB
RESISTOR
# 01011856 RPC05T 0R0 J0OHM L3-8, R4,5,7,236,300,310,C7,36,80,87,90 on MB
01013923 EXBV8V100JV ARRAY RA67,9-11,13,25-29 on MB
# 01457145 EXBE10C103J ARRAY RA1-5,8,12,14-16 on MB
# 01457156 EXBE10C332J ARRAY RA23 on MB
15399365 RPC10T 470 J 1/10W CHIP R58,79,203,204 on MB
15409113 EXBV8V103JV ARRAY RA17-19,22 on MB
00126112 EXBV8V101JV ARRAY RA20,21,24 on MB

JX-305 Sep. 1998
5
POTENTIONMETER
# 01453134 EVJY15F01A54 L=12.5 STEREO VR VR10 on PA
# 01453412 EVUJFUFK1B14 L=12.5 VR1-5,7-9 on PA
# 01565256 EVUJFYFK1B14 L=12.5 CENTER CLICK VR6 on PA
CRYSTAL
00901912 MA-406 24.576MHZ X2 on MB
01126267 MA-406 7.056MHZ X1 on MB
ENCODER
01013223 EVQ VEM F01 24B EN1 on PB
CAPACITOR
# 01015845 ECHU1H181JB5 FILM CHIP C127,132 on MB
01015856 ECHU1H221JB5 FILM CHIP C144,168 on MB
# 01015890 ECHU1H122JB5 FILM CHIP C150,171 on MB
# 01349312 GRM39F105Z10PT CERAMIC CHIP C166,184,263,266 on MB
# 01349378 TCFGA0J475M8R TANTALUM CHIP C79,157,163 on MB
# 01565567 ECHU1C473JB5 FILM CHIP C254,255 on MB
13639546M0 ECEA1CKA100B CHEMICAL(LOW) C23,110 on MB
13639550M0 ECEA1CKA101B CHEMICAL(LOW) C1 on PA,C2 on PB
13649210M0 CAPACITOR ECEA1CKN100B CHEMICAL BIPORLER C63 on MB
FILTER.BEADS
# 01565578 N1608Z601 BEAD CHIP L1,2,9-11,13,14-21-26,31 on MB
# 01565589 N1608ZA601 BEAD CHIP L29,30 on MB
# 01565590 N1608ZA331 BEAD CHIP L19 on MB
# 01565601 N1608ZA121 BEAD CHIP L27 on MB
# 01565612 DSS310-93D223S50 FILTER FL1 on MB
# 01567501 EXC3BB102 BEAD CHIP L12 on MB
12449355 FBR07HA850TB00 FERRITE BEAD L1,2 on PA,L1,2 on PB
CONNECTOR
00904612 52806-1410 FPC CN4 on MB
01120578 IL-FPC-26SL-N FPC CN5,6 on MB,CN1 on PA,CN1 on PB
01341178 CN015S-3013-0 CARD CN11 on MB
13369605 52147-1010 WIRE TRAP CN8 on MB
13379157 IL-FPC-16SL-N FPC CN2 on MB
13379158 IL-FPC-18SL-N FPC CN1 on MB
13429299 51048-1000 CABLE HOLDER CN2 on PA
13439351 IL-S-6P-S2L2-EF CN7 on MB
WIRING.CABLE
00890401 10X150-P2.0 RIBBON CABLE PA-MB
# 01453378 26X550-A6.0BB-P1.25H10 FUJI CARD PB-MB
# 01454123 WIRING W-1 MB-PWSW
# 01454134 WIRING W-2 MB-PWSW
# 01456912 26X250-A6.0BBR-P1.25H10 FUJI CARD PA-MB
# 01454512 16X200-A6.0BBR-P1.25H10 FUJI CARD KBD-MB
# 01567389 18X250-A6.0BBR-P1.25-HBL10 FUJI CARD KBD-MB
SCREW
40011056 3x6mm BINDING B-TIGHT ZC
40011067 3x8mm BINDING B-TIGHT ZC
40011045 2x6mm BINDING B-TIGHT ZC
40011123 4x8mm BINDING B-TIGHT BZC
40011189 3x8mm PAN P-TIGHT ZC
40011201 3x8mm PAN P-TIGHT BZC
40011490 3x6mm SEMS BZC
40011512 3x12mm SEMS BZC
# 40239734 3x6mm VWH B-TIGHT ZC
PACKING CASE
# 01564678 PAD L
# 01564689 PAD R
# 01564690 ADAPTOR PAD
# 01564701 CENTER PAD
# 01564667 PACKING CASE
# 40340023 PE FORM BAG 0.5*1160*450
MISCELLANEOUS
01450745 QFP HEATSINK
12199584 M1698 GROUNDING TERMINAL
ACCESSORIES(Standard)
71011667 OWNER'S MANUAL SET(JAPANESE)
71122389 OWNER'S MANUAL SET(ENGLISH)
01346312 CARD PROTECTOR
00905756 ACI-100C AC ADAPTOR 100V(DC9V.1000mA)
00905767 ACI-120C AC ADAPTOR 120V(DC9V.1000mA)
01018312 ACI-230C AC ADAPTOR 230V(DC9V.1000mA)
#01458278 ACB-230E AC ADAPTOR 230VE(DC9V.1200mA)
12449549 ACB-240(A) AC ADAPTOR 240VA(DC9V.1200mA)

JX-305 Sep. 1998
6
IDENTIFYING THE VERSION
NUMBER
1. Turn the power on.
2. While holding [PATCH], [PTN/SONG] and [TEMPO &
MEASURE], press [NUMBER 4 (CLAP)], [NUMBER
6 (TOM / PERC)], [NUMBER 8 (OTHERS)] in order.
3. The system program version will be displayed.
Every time press the [NUMBER 8 (OTHERS)], readout
on the display changes as follows.
234
1
SYSTEM CPU DATA
USER DATA SAVE AND LOAD
ƒYou can save the user data to a memory card (=
SmartMedia).
Before perform the data saving, you must format a
memory card by using the following procedure.
Format a Memory Card (Smart Media)
1. With the power turned off, insert a memory card (2MB
(S2M-5) or 4MB (S4M-5)) into the memory card slot.
2. Turn on the power.
3. Press [UTILITY].
The indicator will light.
4. Press PAGE [<] [>] several times to select "CARD", and
press [ENTER].
5. Press PAGE [<] [>] several times to select "FORMAT",
and press [ENTER].
The formatting page will appear.
6. Press [ENTER].
The following display will appear, and the Format
operation will be carried out.
7. When formatting ends, the following display will appear.
To exit the formatting page, press [UTILITY].

JX-305 Sep. 1998
7
Saving the user data (User Backup)
1. Make sure that a memory card is inserted into the
memory card slot.
2. Press [UTILITY].
The indicator will light.
3. Press PAGE [<] [>] several times to select "CARD", and
press [ENTER].
4. Press PAGE [<] [>] several times to select "USER
BACKUP", and press [ENTER].
The User Backup page will appear.
5. Press [ENTER].
The following display will appear, and the User Backup
operation will be carried out.
6. When User Backup has been completed, the following
display will appear.
If you wish to exit the User Backup page, press [UTILITY].
Restoring the Saved Setting Back to Internal
Memory (Backup Load)
1. Make sure that a memory card is inserted into the
memory card slot.
2. Press [UTILITY].
The indicator will light.
3. Press PAGE [<] [>] several times to select "CARD", and
press [ENTER].
4. Press PAGE [<] [>] several times to select "Backup
Load", and press [ENTER].
The User Backup page will appear.
5. Press [ENTER].
The following display will appear, and the User Backup
operation will be carried out.
6. When Backup Load has been completed, the following
display will appear.
If you wish to exit the User Backup page, press [UTILITY].

JX-305 Sep. 1998
8
FACTORY PRESET
1. Press [UTILITY].
The indicator will light.
2. Press PAGE [<] [>] several times to select "FACTORY
PRESET", and press [ENTER].
The Factory Preset page will appear.
3. Press PAGE [<] [>] several times to select "ALL".
4. Press [ENTER].
The following display will appear.
5. Press [ENTER].
The following display will appear, and the factory data
will load.
NOTE: It take about 1 minute to complete the data loading.
Never turn the power off while this procedure.
6.When Factory Preset ends, the following display will
appear, and the system will reboot automatically.
Upgrading the program memory
software version
JX-305 uses the FLASH MEMORY.
These ROMs can be update the program by transferring the
data in the upgrading disk (SMF format), through MIDI.
Required Items
⋅JX-305 Version Up Disk Set (PNo. 17048906)
(The Version up disk contains the JX-305 program
converted into SMF data. Obtain the latest version from
the service center.)
⋅Sequencer (Anything that will play back SMF will do.)
⋅MIDI cable
Update procedure
1. Connect MIDI OUT of the Sequncer with MIDI IN of the
JX-305.
2. Turn the power on while holding down [MUTE CTRL]
button, hold on to press [MUTE CTRL], press the
[NUMBER 3 (HH)] button.
Display Shows as follows
3. Press the [ENTER] button, then JX-305 check the ROM-
ID number.
And display shows as follows.
Check to see that the display shows as described above
and then playback the SMF data. When the update
procedure is in normal operation, BEAT LED will blink.
The file names are as follows.
_000001.mid
_000002.mid
|
_000016.mid

JX-305 Sep. 1998
9
(For cases where program data volume is small, the file
count is less than 16.)
While playing, a check sum appears on the display.
One = **** : Check sum of the each file.
AL = **** : Total.
After the all files has been played, compare the original
checksum (described on disk label or Service
Information) to the current checksum for discrepancies.
Update procedure is complete.
ƒAfter executing update procedure, be sure to perform the
Factory Preset data loading.
TEST MODE
NOTE: Before executing test mode, be sure to backup user
data as explained in the section "Saving and Loading
user data". And when you execute test mode, the
various parameters will be given special settings.
After executing test mode, be sure to load the
Factory preset data, and the User data.
Required items
MIDI Cable x1
SmartMedia x2 (Formatted/Protected)
Foot Pedal (DP-2 etc.) x2
Expression Pedal (EV-5 etc.) x1
Monitor Speaker (MA-12 etc.) x2
Entering the TEST MODE
1. Connect the Monitor Speaker to the OUTPUT of the JX-
305.
2. Turn the power on while holding down [ENVELOPE],
[PART SELECT] and [PART MUTE].
You will enter the TEST MODE and the following basic
display will appear.
3. Press [ENTER]. TEST MODE will be started.
As a rule, tests are in the order of test number, but you can
select the each test items directory by pressing the [BANK 1]
to [BANK 8], [NUMBER 1 (BD)] [NUMBER 2 (SD)]
[NUMBER 8 (OTHERS) ] while pressing [SHIFT] button
when LCD displays "JX-305 Test Mode".

JX-305 Sep. 1998
10
Exiting the TEST MODE
When Bender Test ends, the following display appear.
Press [ENTER] button to load the factory preset data.
NOTE: It takes about 1 minute to complete the data loading.
Never turn the power off while this procedure.
Test Item
The JX-305 has the following 11 items.
Some test items will be started automatically, when the next
previous test ends normally.
1. Memory Test [SHIFT] + [BANK 1]
2. MIDI Test [SHIFT] + [BANK 2]
(Identifying the Program Version)
3. Card Test [SHIFT] + [BANK 3]
4. Pedal Test [SHIFT] + [BANK 4]
5. SW/LED Test [SHIFT] + [BANK 5]
6. A/D Test [SHIFT] + [BANK 6]
7. After Touch Test [SHIFT] + [BANK 7]
8. Sound Test [SHIFT] + [BANK 8]
9. DSP Test [SHIFT] + [NUMBER 1]
10.LCD & Encoder Test [SHIFT] + [NUMBER 2]
11. Bender Test& Factory Data Set [SHIFT] + [NUMBER 8]
•Exiting the each Test item
Press [ENTER] while holding down [EXIT].
The test will be suspended and JX-305 return to basic
test mode display.
NOTE: When LCD displays "Factory Data Set ok ?" in 11.,
the test can not be suspended.
1. Memory Test
1-1. Press [ENTER] in the basic test display. Memory Test
will be started.
The following display will appear.
1-2. When the test of the each device end, display --- will
change to "ok" or "NG". If test result are "ok", next test
runs automatically.
Troubleshooting for Memory test
2. MIDI test
When Memory Test ends normally, MIDI Test runs
automatically.
(or in the initial display of the test mode, press [BANK 2]
while holding down [SHIFT])
2-1. When MIDI test starts, following display appears.
2-2. Make a loop with MIDI cable that connects MIDI IN
and MIDI OUT.
Does the LCD display "ok" ?
2-3. When the LCD display "ok", Press [ENTER]. The
system program version will be displayed.
And press the [ENTER] again. You can check the
program version number of the CPU and Preset Data.
Result of Test
Prg NG!
Dat NG !
Usr NG !
RAM NG !
Check
Check IC1 on Main Board
Check IC8 on Main Board
Check IC7 on Main Board
Check IC2 on Main Board

JX-305 Sep. 1998
11
2-4. Remove the MIDI cable.
Display shows "Disconnect ok", and then next test run
automatically.
Troubleshooting for MIDI test
3. Card Test
When MIDI Test ends normally, Card Test runs
automatically.
(or in the initial display of the test mode, press [BANK 3]
while holding down [SHIFT])
3-1. When Card test starts, the following display appears.
3-2. Insert a card with write protected.
Does the LCD display "ok" ?
3-3. Remove the card once, and insert the card with not
write protected.
Does the LCD display "ok" ?
NOTE: When you execute card test mode, the data in card
will be lost.
Use the card for test.
Troubleshooting for Card test
4. Pedal Test
When Card Test ends normally, Pedal Test runs
automatically.
(or in the initial display of the test mode, press [BANK 4]
while holding down [SHIFT])
4-1. When Pedal test starts, the following display appears.
4-2. Connect the Foot Pedals to the Hold Jack and the
Switch Jack.
4-3. Step on the HOLD Pedal. And check that "on" have
been displayed.
4-4. Foot off the HOLD Pedal. And check that "off" have
been displayed.
4-5. Step on the SWITCH Pedal. And check that "on" have
been displayed.
4-6. Foot off the SWITCH Pedal. And check that "off" have
been displayed.
Result of Test
No response
Display remains "on"
Check
Check Q4
Is signal level of the PEDAL change ?
Check the condition of connection of
L9-12,R47,48
Result of Test
No response
Protect NG!
Read / Write NG
Check
Check IC29 (Pin 1 / 2 / 7)
If the Card is inserted, Voltage of
IC29 Pin 1 becomes high level.
Check R18, IC5
Is the voltage of XCWP Low level?
Check IC30 (Pin 3 / 6)
Is the level of XRE / XWE change
during the test?
Check IC20, RA16
Is there something wrong with card
bus ?
Check IC30 (Pin 8) / IC32
Is there something wrong with decoder
Check the IC29 (Pin 3, Write Protect)
Is the voltage of XWP High level?

JX-305 Sep. 1998
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Troubleshooting for Pedal test
5. SW & LED Test
When Pedal Test ends normally, SW & LED Test runs
automatically.
(or in the initial display of the test mode, press [BANK 5]
while holding down [SHIFT])
5-1. When SW & LED test starts, the following display
appears.
Are All LEDs turn on ?
5-2. Press all buttons one by one. Then each button, names
of buttons appear on the display, and sounds.
And buttons that have corresponding LEDs are put out
its LEDs.
Press the all buttons for turning off the all LEDs.
•When you press [PLAY] button, press two times.
When you press [TEMPO & MEASURE], press three
times. And check that the Beat LED turns GREEN
and RED and off in order.
Is button name appeared on the display ?
Are all LEDs turn off ?
NOTE: If you press two buttons simultaneously, the LCD
display error.
5-3. If test ends normally, press [ENTER] to start next test.
Troubleshooting for SW & LED test
6. AD Test
When SW / LED Test ends normally, AD Test runs
automatically.
(or in the initial display of the test mode, press [BANK 6]
while holding down [SHIFT].)
6-1. Connect the Expression to the Control Jack.
6-2. When AD test starts, the JX-305 into standby mode.
Move each knob, name and value of the knob are
displayed.
Move the all knobs and sliders fully one by one.
(excluding "VOLUME")
NOTE: If you move the knobs and Bender, Modulation, Ctrl
Pedal, knobs simultaneously, the LCD display error.
To abort a command, press [BWD] button.
Press on the Control Pedal.
Check that the value changes 0 from 127.
Check the mid value 64 when move Env Depth.
Result of Test
No response
Display remains "on"
Check
Check Q4
Is signal level of the PEDAL change ?
Check the condition of connection of
L9-12,R47,48
Result of Test
One of the LEDs
dose not lit.
Two or more LEDs
do not lit.
One of the SWs
dose not work.
TWO or more SWs
do not work.
LED stays on.
Check
Check the condition of connection of
LED.
Refer to the circuit diagram, check
the transistor, buffer (74HC245), or
decoder (74HC138) around the LED
circuitry.
Check the diode and condition of
connection of SW.
Refer to the circuit diagram, check
the decoder and transistor array.
Check the short circuit of signal lines
of LED.

JX-305 Sep. 1998
13
6-3. When test ends, press [ENTER] to start next test.
Troubleshooting for AD test
7. After Touch Test
When AD Test ends normally, After Touch Test runs
automatically.
(or in the initial display of the test mode, press [BANK 7]
while holding down [SHIFT])
7-1. When After Touch test starts, the following display
appears.
7-2. Press C7, C4, C2 key firmly one by one.
Check that value increase to 127.
NOTE: If you press the key and Bender,Modulation,Ctrl
Pedal, knobs simultaneously, the LCD display error.
To abort a command, press [BWD] button.
7-3. When After Touch test ends, "ok" appears on the
display.
7-4. If test ends normally, press [ENTER] to start next test.
Troubleshooting for After Touch test
8. Sound Test
When After Touch Test ends normally, SOUND Test runs
automatically.
(or in the initial display of the test mode, press [NUMBER
1(BD)] while holding down [SHIFT]).
8-1. Rotate the VOLUME knob fully clockwise.
8-2. Connect the Monitor to the OUTPUT Jack of the JX-
305, and also connect the Headphone to the PHONES
Jack. In the case of you use one Monitor, be sure to
insert the opened plug into the another channel of the
OUTPUT to obtain the correct wave form.
Verify the waveform being output by the oscilloscope,
and check the sound.
8-3. When sound test starts, at first sound output from L ch
of MIXOUT and Headphone.
Every time press the [ENTER], output channel is
switched.
At first, JX-305 output sine wave from each jacks, and
next rectangular wave form is output.
start OUTPUT /L sine wave
press [ENTER] OUTPUT /R sine wave
: OUTPUT /L rectangular wave
: OUTPUT /R rectangular wave
Change the connection of the monitor to corresponding
jack.
Pitch of the sound is different depends on each jack.
Verify that no undesired sound is heard.
Verify that no undesired waveform or voltage detected.
Result of Test
No response
Value does not
reach the 0 or 127
Error result even if
move the knob or
slider one by one
Check
Inspect the signal path of AS0, AS1,
for breaks or short circuit.
Check the power supply of the panel
Check the analog switches
(74HC4051:IC2 on PB)
Inspect the capacitor that is attached
to the potentiometer for short circuit
Inspect the signal path of the
potentiometer for short circuit
Check analog switch whether signal
of AN3, AN4 are not corrupted.
Result of Test
No response
Value does not
reach the 0 or 127
Check
Check Q30
Check the condition of connection
Check the power supply of Q7
Check keyboard

JX-305 Sep. 1998
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8-4. When test ends, press [ENTER] to start next test.
Troubleshooting for Sound Test
9. DSP Test
When Sound Test ends normally, DSP Test runs
automatically.
(or in the initial display of the test mode, press [NUMBER 1
(BD)] while holding down [SHIFT])
9-1. When DSP test starts, test runs automatically and 7 part
are checked.
If test result are OK, "o" appears on the display and if
NG, "x" appears on the display.
9-2. If test results is OK, press [ENTER] to start next test.
Troubleshooting for DSP test
10.LCD & Encoder Test
When DSP Test ends normally, LCD test runs automatically.
(or in the initial display of test mode, press [NUMBER 2
(HH)] while holding down [SHIFT]).
10-1. When LCD & Encoder Test starts, all dots of the LCD
will light.
Check that the contrast of the LCD changes by rotating
the encoder clockwise and counter clockwise.
Check that all LEDs (([BANK 1] Å` [NUMBER 8])
turn on.
10-2. When test ends, press [ENTER].
Troubleshooting for LCD & Encoder Test
11.Bender test & Factory Data set
When LCD & Encoder Test ends normally, Bender test &
Factory Data set runs automatically.
(or in the initial display of the test mode, press [NUMBER 3
(HH)] while holding down [SHIFT])
11-1.When Bender test & Factory Data set starts, the
following display appears.
11-2.Push the bender lever leftward lightly and then
gradually return it to the original position.
11-3.Push the bender lever rightward lightly and then
gradually return it to the original position.
11-4. Press [REC] button.
The follow display will appear.
Result of Test
No sound
Sound is too loud,
soft or distorted
Check
Check D/A converter (AK4324;IC24)
Check IC3 on PB, IC23, 25 on MB
Check around filter circuitry distorted
Result of Test
"x" displayed
Check
Check IC33
Bleak or etc
Check IC6
Pin 119-143
Result of Test
One of the dot is
not lit
Contrast of the
LCD is not
changed
Contrast of the
LCD is pale, even
if adjust its contrast
maximum level.
Contrast of the
LCD is dark, even
if adjust its contrast
minimum level.
LED dose not
change
Check
Replace the LCD unit.
Check R249
Is PWM waveform input to the QFP
side of the R262?
Check DA7
Is there short in the circuit ?
If the above check points are normal,
replace the LCD unit.
Check MAIN BOARD IC31 Pin 91, 92
Is pulse generated ?>Check the
condition of connection of R29, 30,
C96, 97 on the MAIN BOARD

JX-305 Sep. 1998
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11-5. Are the following values obtained when the bender
lever is moved all the way to the left and right ?
level left center right
value -256 0 256
NOTE: If you move After Touch , Modulation, Ctrl Pedal,
knobs simultaneously, the LCD display error.
To abort a command, press [BWD] button.
When MIN and MAX displayed, The following
display will appear.
11-6. Set the bender lever to MOD position and then return it
to the original position.
Does the MOD value increase from 0 to 127 ?
11-7. Test ends normally, the following display will appear.
Press [ENTER] button, Factory Data will be loaded.
Troubleshooting for the AD Test
Result of Test
No response
Value does not
reach the 0 or 127 ,
-256 or +256
Check
Check Q6, 7>Check the condition of
connection
Check the power supply of Q6, 7
If the above check points are normal, replace the Bender unit.

JX-305 Sep. 1998
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KEYBOARD PARTS LIST KEYBOARD DISASSEMBLY
1. ATTACHING THE PCBs
1) First, turn the chassis over on the other side, being careful
not to reverse the right and left ends.
Next, as shown in fig. 1, place SPACER 12P (4 pieces)
on the chassis from the left end (the bass side of
keyboard), aligning them with the posisioning holes
provided on the chassis.
(Refer to fig. 2.)
In the same way, place SPACER 13P on the right side of
the chassis (the treble side).
PARTS No, PARTS NAME Qty.
70890767
70890778
01015134
01015145
22205597
22205598
SK-8A61 PWB HI-AFT ASSY
SK-8A61 PWB LOW ASSY
SK-8A RUBBER SWITCH 12P
SK-8A RUBBER SWITCH 13P
SK-8 PCB SPACER 12P
SK-8 PCB SPACER 13P
BINDING TAPTIGHT B 3x10mm ZC
1
1
4
1
4
1
2440012256
Required Parts
JX-305(SK-861-K) PARTS LIST
No. PARTS No. PARTS NAME
1
2
3
4
5
7
9
32575349
32575348
32575350
32575351
32575347
32575355
* * * * * * * *
22815838
32155199
70890767
01015134
01015145
22205597
22205598
00018978
SK-8 N-KEY CF
SK-8 N-KEY EB
SK-8 N-KEY D
SK-8 N-KEY G
SK-8 N-KEY A
SK-8 S-KEY
SK-8 CHASSIS 61P-E ASSY
SK-8 CHASSIS 61P-C
SK-8 GUIDE
SK-8A61 PWB HI-AFT ASSY
SK-8A RUBBER SWITCH 12P
SK-8A RUBBER SWITCH 13P
SK-8 PCB SPACER 12P
SK-8 PCB SPACER 13P
SK-8 STOPPER 12P
SK-8 SPRING
B^Cg oC h3~10 ZC
70890778 SK-8A61 PWB LOW ASSY
8
32575353 SK-8 N-KEY C'F'
6
22265529 SK-861 CUSHION 61KEY B
40017134
01236767 SK-861 AFTERTOUCH
00018989 SK-8 STOPPER 13P
40012256 JV-50 KEYBOARD ANGLE
00126612
10
B^Cg oC h3~8ZC
40011067
11
1 2 5 7811
310
46 9
fig.1
fig.2
Bass Side Treable Side
Positioning Hole of Chassis
Positioning Holes of Chassis
SPACER 12P x4 SPACER 13P
Positioning Holes of Chassis

JX-305 Sep. 1998
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2) Next, aligning the positioning bosses of RUBBER
SWITCH with the circular holes of SPACER, and as
done for the spacer, place four RUBBER SWITCH 12PL,
and one RUBBER SWITCH 13P in order, starting on the
lower tone side.
In this procedure, make sure that RUBBER SWITCH and
SPACER are positioned with their cutout parts and
ascape grooves aligned, respectively.
(Refer to fig. 3 and fig. 4.)
3) Next, using the cutout part of PCB and the projecting part
of SPACER as positioning guide, place PCB so that the
positioning pin of SPACER fits into the positioning hole
of PCB. (Refer to fig. 5)
As fig. 6 shows, PCBs consist of three boards, "LOW"
and "HI".
4) Then, tighten the LOW and HI PCBs with the Tap Tight
Screws. First tighten the near-center Screws 1, then the
end Screws 2 on the other side. (This order must be
followd. Ohterwise the PCBs may not be flush with the
Spacers.)
Then tighten the remaining Screws 3 of the LOW and HI
PCBs. (For the above, refer to Fig. 7.)
Finally, tighten the Screws in the area adjacent to the
LOW and HI PCBs.
Since the PCBs may have been warped by soldering, etc.,
it is recommended to gently hole down the center and
tighten the Screws.
2. REMOVAL AND REINSTALLATION OF THE KEYS
Before removing the keys, first take the stopper off the rear
side of the chassis, then take away the spring.
When reinstalling the keys, carefully apply the stopper as
shown in fig. 8.
Bring the stopper into closs contact with the ends of the white
key shafts and press the stopper in the area of the double-
coated tape to secure it. (Refer fig. 8.)
Viewed from the rear side of the chassis.
STOPPER 12P x4 STOPPER 13P
fig.9
32P LOW 29P HI
fig.3
Posisioning Boss(6 points)
RUBBER SWITCH
PCB SPACER
Chassis
fig.4
Air-Escape Groove
Cutout Part
fig.6
fig.5
Projecting Part of SPACER
PCB Cutout Part
Positioning Pin of SPACER
Bass Side Treble Side
32P LOW 29P HI
12
fig.7 (ex. 32P LOW)
3PCB Adjacent Area
fig.8
Double-Coated
Adhesive Tape
Stopper
Sharp Key Axis
Normal
Key Axis

JX-305 Sep. 1998
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BLOCK DIAGRAM

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CIRCUIT BOARD (MAIN)
ASSY 71011634
View from foil side.

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CIRCUIT BOARD (MAIN)
ASSY 71011634
View from components side.