CHD Elektroservis CRX8-M User manual

7
Model 8-449
ver. 1.0
INSTALLATION MANUAL FOR CR-68
©
2013 CHD Elektroservis

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
No part of this publicat ion may be reproduced in any form wit hout t he written permission of CHD Elektroservis.
2
Content
page
1. General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Parts of MID I interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. MID I interface installati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Removing of i nstrument’s cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2. Modification of instrument’s rear panel . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2.1. Panel removing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2.2. D ri lling of holes for interface boar d, MIDI s oc kets and s witch . . . . . . . . . . . . . . 5
2.2.3. Montage of interface board, MID I sock ets and swi tch . . . . . . . . . . . . . . . . . . 5
2.3. C PU board removing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4. Replac ement of indication LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5. Flat cable of tri gger signals installation . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.6. Flat cable of control signals installation . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.7. Audio-cable installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.8. Finishing of installati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Thi s manual in PD F form is available on supplemental C D -ROM or on manufacturer’s web-pages .
Manufacturer :
CHD Elektroservis
Nad kundratkou 27, 19000 Praha 9
Czech Republic
[e-mail]
www. c h d - e l . c z

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
No part of this publicat ion may be reproduced in any form wit hout t he written permission of CHD Elektroservis.
3
1. GENERAL INFORMATION
C RX 8-M MID I i nter fac e enables full i ntegr ation of Roland CR-68 and C R-78 instruments to MIDI
sys tem. The Interface affects s ome functional blocks of the instrument which then can be controlled
with a help of MIDI commands. All original functions of the instrument s tay unc hanged and the
instrument still can be used the same way as before the interface installation. Pic. 1.1 shows functional
bloc k diagram of the instrument after the interface installation.
Pic. 1.1 – Connection to the instrument
1.1. PARTS OF MIDI IN TER FAC E
The deli very of MID I interface kit contents all parts nec es sary for installation i nc . all suppor t and
coupling elements. Parts of deli very are also manuals for installati on, handling and i nterfac e’s Sys Ex
communication and CD-ROM with support software. Please check if the delivery is complete befor e
the installation (see pic. 1.1.1).
P ic. 1.1.1 – Parts of the interface kit

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
No part of this publicat ion may be reproduced in any form wit hout t he written permission of CHD Elektroservis.
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The C RX8-M i nterfac e kit deli very c ontents :
[1] MID I interface board [8] C oupling elements: 4x screw M3x6, 4x screw
[2] 2x S upport guide for PC B M3x10, 4x washer φ3,2, 4x tooth lock washer
[3] 2x B unched cables with DIN-5 sock et φ3,2, 4x nut M3, 5x plastic s tripe, insulation tube
[4] Bunched c ables with tumbler switch φ1 mm, 3x heat-s hrink insulation tube φ2 mm,
[5] 2x Flat cable wi th connector heat-shrink insulation tube φ4 mm
[6] Shi elded audio-c able w ith connec tor [9] D oc umentation: C D -ROM, manuals in printed form
[7] Bi-color LE D, resi stor 1MΩ
2. MID I IN TERFACE IN STALLATION
Montage of all parts of the interface into Roland CR-68 / CR-78 instrument is a little more
complicated but no major problem should occur if all instructions indi cated in i ns tallation manual are
kept. Proc edures of interface’s par ts installation are des cribed in detail in c hapters below. Please k eep
these instructions exactly so that the instrument isn’t damaged.
Attention ! Disconnect the instrument from the mains prior to the installation.
Otherwise, there is a risk of the electric shock!
The producer is not responsible for any eventual mechanical or electrical dam age of
the CR-68 / CR-78 instrument caused by the infringement of the described installation
procedure or by careless manipulation during the installation of the MIDI interface!
2.1. REMOVING OF INSTRUMENT’S COVER
a) Uns crew four screws on bottom si de of the ins tr ument cover ( pi c. 2.1.1) Keep the screws.
They will be used again after the MIDI k it i nstallation.
b) C arefully extrude the instrument’s chassi s bac kward from the cover (pic. 2.1.2).
Pic. 2.1.1 Pic. 2.1.2
2.2. MODIFICATION OF IN STR U MENT’S R EAR P AN EL
MIDI sockets, tumbler switch and interface’s board will be placed on rear panel of the instrument.
For easier montage of these elements, it is convenient to remove the panel from the instrument.
2.2.1. PAN EL R E MOVIN G
a) Flip over the ins trument upsi de down and uns crew earth solder lug of mains cable fr om
instrument’s chassis (pi c. 2.2.1.1).
b) Unsolder black and white wires of mains cable from terminal plate on rear panel (pic. 2.2.1.2).

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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Pic. 2.2.1.1 Pic. 2.2.1.2
c) Fli p over the instrument back and uns cr ew nuts of J ack connectors on i ns trument’s rear panel
(pic. 2.2.1.3). Keep the nuts and i nsulati ng was hers . They will be used again after the MIDI kit
ins tallation. Remove the J ac k boar d (label OP -102) from the panel and put it aside carefully so that
cables soldered to the board would not be damaged.
d) Unsc rew four screws on instrument’ s rear panel ( pic . 2.2.1.4) – now the panel is freed. Keep
the screw. They will be used again after the MIDI kit installation.
Pic. 2.2.1.3 Pic. 2.2.1.4
e) Remove rear panel with mains c able and terminal plate from the ins tr ument.
2.2.2. D RILLING OF H OLES FOR IN TE RFACE B OARD , MID I SOCK ETS AN D SWITCH
a) It is necessary to drill total of 12 holes to instrument’s rear panel (1x φ 2 mm, 8x φ 3,5 mm, 1x φ
6,5 mm and 2x φ 16 mm) as shown on pic. 2.2.2.1. For easier designation of centers of new holes, it i s
convenient to us e drill template in s cale 1:1 (template i n P DF form is part of documentati on on
supplemental CD-ROM). Put the template to rear panel (from outer s ide) and c opy pos itions of centers
of new holes to the panel with help of scriber or center punc h.
Note.: If necessary, remove mains cable holder and terminal plate from rear panel. This enables
eas ier work with the template.
b) Drill all necessary holes. Use sharp drills with required diameters. Work carefully so that
surface of the panel is not damaged during drilling! C lean the edge of all holes with small rasp or with
poi nt of bigger drill after drilling.
2.2.3. MON TAGE OF IN TER FAC E B OAR D , MID I SOC K ETS AND S WITC H
a) P ut plas tic guide s uppor ts of the inter face’ s board to insi de of the panel so that gri ps of detent
pins of the supports were upwards and sc rew the supports to the panel (pi c. 2.2.3.1).

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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P ic. 2.2.2.1

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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b) Unclog detent pins on supports by pressing of grips ([A] on pic. 2.2.3.2) and intromit interface
board into the supports so that triad of connectors with locks is pointed at holes for MIDI sockets and
swi tch ( [B ] on pi c. 2.2.3.2). Then fix the inter face board by pulling of grips - detent pins must click into
detent holes in the i nterfac e board.
P ic. 2.2.3.1 Pic. 2.2.3.2
c ) Get flat connec tors of MIDI c ables through the holes wi th φ 16 mm (from outside of the panel)
and insert DIN soc kets of the cables into the holes fully. Both MID I bunc hed cables are identic al and
they can be swapped.
d) Fix DIN sockets to the panel using screws M3, tooth lock washers φ 3,2 mm and nuts M3 from
the interface ac cess ories (pi c. 2.2.3.3).
P ic. 2.2.3.3 Pic. 2.2.3.4
Pic. 2.2.3.5 Pic. 2.2.3.6
e) Insert tumbler switch into hole with φ 6,5 mm (from inside of panel) and fix it using nuts and
washers (pic. 2.2.3.4). Orientation of the switch gives washer with aligning plugs – it assures that the
switch can’t be mounted contrarywise.

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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f) Plug connectors of bunc hed cables of MID I sockets and s witch to interfac e board ( pic . 2.2.3.5)
– back connector is for the switch [A], middle is for MIDI input [B] and fore is for MIDI output [C].
Orientation of the connec tors is unambiguous ly gi ven by the loc k and they can’t be flipped.
g) It is suitable to label the D IN sockets and tumbler switch – for example, with self-adhes ive foil
glued near to the s oc kets and s witch on panel of the instrument (pic. 2.2.3.6).
h) Leave rear panel unmounted so that easy ac cess ibili ty to instrument’ printed circ uits boards i s
kept during next procedures of installation.
2.3. C PU B OAR D R EMOVIN G
a) B y pulling, remove k nobs fr om potentiometer TEMPO and rotary selectors VARIATION on
instrument’s front panel (pic . 2.3.1).
b) Uns older wir es from START/STOP button ([A], black and white) and VA RIATION button ( [B ],
black and orange) from CPU board (pic. 2.3.2).
Pic. 2.3.1 Pic. 2.3.2
c) Unsc rew two s crews on left si de and two sc rews on right side of i nstrument’s front which are
fixing holder of CPU board (pic. 2.3.3). Keep the screws. They will be used again after the MIDI kit
installation.
d) Now, the C PU board i s freed and it can be tur ned out of the ins trument s o that c omponents on
the board will be acc es sible (pi c. 2.3.4).
Pic. 2.3.3 Pic. 2.3.4
2.4. R EPLACE MENT OF IND IC ATION LED
a) Remove ori ginal LED from C PU board of the instrument (pic. 2.4.1).
b) A dapt leads of bi-color LED from the interface access ory as shown on pi c. 2.4.2. P lac e
ins ulating tubes φ 1 mm from the interface acc es sor ies on leads of the LE D.
c) Insert bent leads “R“ and “C“ of bi-color LED into freed holes in C PU board and s older them
(pic. 2.4.3). Str ai ght lead “G“ oriented to c utout in the C PU board stays unconnected meanwhile.

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
No part of this publicat ion may be reproduced in any form wit hout t he written permission of CHD Elektroservis.
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P ic. 2.4.1 Pic. 2.4.2
P ic. 2.4.3
2.5. FLAT CABLE OF TRIGGER SIGNALS INSTALLATION
Table 1 – Wires of flat cable of sound generators trigger signals connection
Wire Signal Pad for connection Remarks
1 B ass D rum “BD “ – resistor R9 / collec tor of transi stor Q25 C olored wire
2 Snare Drum “SD“ – resistor R10 / collector of transistor Q26
3 Rim Shot “RS “ – res is tor R154/ collector of trans istor Q33
4 High Bonga “HB“ – resistor R13 / collec tor of transistor Q29
5 Low Bonga “LB“ – resis tor R156 / collector of transis tor Q35
6 Low Conga “LC“ – resi stor R15 / collector of transis tor Q31
7 C ow Bell “C B“ – resi stor R14 / collector of tr ans is tor Q30
8 Maracas “M“ – resis tor R12 / collector of transistor Q28
9 High Hat “HH “ – res is tor R153 / collector of transis tor Q32
10 C ymbal “C Y“ – resistor R11 / collector of transistor Q27
11 C laves “C “ – resis tor R155 / collector of transis tor Q34
12 Tambourine L - Unus ed wire
13 Tambourine H - Unus ed wire
14 Gui ro P - Unus ed wire
15 Gui ro T - Unus ed wire
16 Metallic Beat - Unus ed wire

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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0
Pic. 2.5.1
View to components si de !

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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Use one of flat 16-wire cable fr om the interface acces sory as c able of tr igger s ignals – both
deli vered flat cables are identic al and they c an be s wapped.
S plit up free end of the c able (by r ippi ng or cutti ng) to indi vidual wires and adapt their lengths as
necessary during the cable installation. Cut out wires Nr. 12 to 16 entirely. They are not used in CR-68
instrument (pic. 2.5.2). Stripe ends of wires Nr. 1 (signed with red c olor) to 11 in length about 2 mm
and ti n them.
All wires of the cable will be connected to sound generators board VG-12 from soldering side.
The board is plac ed i n ins trument’s c hass is wi th solderi ng s ide upward (pic . 2.5.3). Particular wires of
tri gger si gnals cable will be connec ted i n acc or danc e with table 1 and pi c. 2.5.1, 2.5.4.
Note.: Used s oldering pads on the boar d are si gned by abbreviati ons of c orres pondi ng drum
instruments (BD, SD , etc., pic. 2.5.4).
P ic. 2.5.2 Pic. 2.5.3
Pic. 2.5.4
a) Solder wire Nr. 1 “Bass Drum“ (terminal,
signed in red) to lead of res istor R9 interc onnected
with collector of transi stor Q25 ([1] on pic. 2.5.1).
b) Solder wire Nr. 2 “Snare Drum“ to lead of
resistor R10 interconnected with collector of
transis tor Q26 ([2] on pi c. 2.5.1).
c ) S older wire Nr. 3 “Rim Shot“ to lead of
resis tor R154 interc onnected with collector of
transis tor Q33 ([3] on pi c. 2.5.1).
d) Solder wire Nr. 4 “High Bonga“ to lead of
resistor R13 interconnected with collector of
transis tor Q29 ([4] on pi c. 2.5.1).
e) Solder wire Nr. 5 “Low Bonga“ to lead of
resis tor R156 interc onnected with collector of
transis tor Q35 ([5] on pi c. 2.5.1).
f) Solder wi re Nr. 6 “Low C onga“ to lead of
resistor R15 interconnected with collector of transistor Q31 ([6] on pic. 2.5.1).
g) Solder wire Nr. 7 “Cow Bell“ to lead of resistor R14 interconnected with collector of transis tor
Q30 ([7] on pic. 2.5.1).
h) Solder wire Nr. 8 “Maracas“ to lead of resistor R12 interconnected with collector of transistor
Q28 ([8] on pic. 2.5.1).
i) Solder wire Nr. 9 “High Hat“ to lead of resistor R153 interconnected with collector of trans is tor
Q32 ([9] on pic. 2.5.1).

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
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j) Solder wire Nr. 10 “Cymbal“ to lead of resistor R11 interconnected with collector of transistor
Q27 ([10] on pi c. 2.5.1) .
k) Solder wire Nr. 11 “Claves“ to lead of resistor R155 interconnected with collector of transis tor
Q34 ([11] on pi c. 2.5.1) .
2.6. FLAT CABLE OF CONTROL SIGNALS INSTALLATION
Use remaining flat 16-wire cable from the interface accessory as cable of trigger signals – both
deli vered flat cables are identic al and they c an be s wapped.
By the same way as with control signals cable, split up free end of trigger signals cable (by
rippi ng or c utting) to individual wi res and adapt their lengths as nec ess ary duri ng the cable i ns tallation.
Cut out wire Nr. 1 (signed with red color) entirely. It is not us ed in C R-68 ins trument (pi c. 2.6.3). Str ipe
ends of wires Nr. 1 to 16 in length about 2 mm and tin them.
Particular wires of trigger signals cable will be connected to sound generators board (VG-12) and
to C PU board of the instrument in ac cordance with table 2 and pic. 2.6.1, 2.6.2.
There are two versions of C PU board with label GL-10A (older version) and G L-10B (newer
version). GL-10A and GL-10B boards have a little different placement of s ome components ( pic .
2.6.1a, 2.6.1b).
Pic. 2.6.1
VG-12 / View to components side !

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
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Pic. 2.6.2a
GL10A / View to s oldering s ide !

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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Pic. 2.6.2b
GL10B / V iew to soldering side!

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
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Table 2 – Wires of flat cable of control signals connection
W ire S ignal Pad for connec tion Remarks
1 MB-IN - Colored, unused wire
2 S/S-RST CPU board, lead of R212 resistor
3 S /S-SET CPU board, lead Nr. 6 of IC5 C ut the IC lead from board !
4 LED-R CPU board, lead of R231 resistor
5 LED -G Lead G of bi -c olor LED Newly i ns talled LED
6 LED -IN C PU board, lead of R230 resi stor
7 S /S-RUN C PU board, lead Nr. 1 of IC5
8+9 +5 V C PU board, soldering pad “40” (+5)
10+11 GND C PU board, s oldering pad “38” (G )
12 +15 V C PU board, soldering pad “39” (+15)
13 C LK-OUT C PU board, lead Nr. 1 of IC10
14 CLK-IN C PU board, lead of R208 resistor
15 ACC-OUT Sound generators board, cathode of D31
16 A C C -IN Sound generators board, lead of R147 resis tor
Pic. 2.6.3 Pic. 2.6.4
a) C ut off lead Nr . 6 of integrated ci rc uit IC5 as nearly as poss ible at printed circuit board (pic .
2.6.4). Align freed lead with a help of tweezers (pic. 2.6.5). B e very careful so that no other
components and c opper layers on the board are damaged!
b) Solder wire Nr. 3 ”S/S-SET“ of flat cable of control signals to freed lead Nr. 6 of integrated
circuit IC 5 ([3] on pic . 2.6.2 and 2.6.6).
Pic. 2.6.5 Pic. 2.6.6

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
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c) Place heat-shrink insulation tube φ 2 mm (fr om the interfac e access or y) on wire Nr . 5 “LED -G“
and solder it to lead “G” ( unconnected by that ti me) of newly installed bi-color LED. Isolate the
connection with the ins ulation tube and heat it (wi th a hot-flue pis tol for example) until i t shrinks tightly
to the wire and LED ’s lead ([5] on pic. 2.6.7).
d) Solder wire Nr. 15 ”ACC-OUT“ to cathode of D31 diode on sound generators board VG-12
([15] on pic. 2.6.1 and 2.6.8).
e) Solder wire Nr. 16 ”ACC-IN“ to upper lead of R147 resistor (interconnected with emitter of
trans is tor Q20) on sound generators board V G-12 ([16] on pic . 2.6.1 and 2.6.8).
Pic. 2.6.7 Pic. 2.6.8
f) Tur n C PU board bac k and ins ert it into front panel of the i ns trument. Be sure that bi-color LED
is correctly placed i n hole in front panel.
g) Fix CP U board back to instrument’s front panel using four original screws (pic. 2.6.9).
h) S older wi res fr om START/STOP button ([A], white to soldering pad “42“, black to soldering
pad “43“) and V ARIATION button ([B), orange to soldering pad “6“ , blac k to s oldering pad “7“) back to
CP U board (pic. 2.6.10).
Pic. 2.6.9 Pic. 2.6.10
i) Now, c onnect remaining wires of flat cable of c ontrol si gnals to CPU board from soldering
side: Solder wire Nr. 2 “SS -RST“ to lead of resis tor R212 ([2] on pic. 2.6.2).
j) Solder wire Nr. 4 “LE D-R“ to lead of resis tor R231 ([4] on pic. 2.6.2).
k) Solder wi re Nr. 6 “LED -IN“ to lead of resistor R230 ([6] on pic. 2.6.2).
l) Solder wire Nr. 7 „LE D-IN“ to lead Nr. 1 of IC 5 ([7] on pi c. 2.6.2).
m) On CPU board, interrupt (e.g. using thick needle) connection between lead of R208 resistor
and pin Nr. 1 of IC 10. This c onnection is marked by crossli ne on pic. 2.6.2.
n) Solder wi re Nr. 13 “C LK-OUT“ to lead Nr. 1 of IC 10 ([13] on pic. 2.6.2).
o) Solder wire Nr. 14 “C LK -IN“ to lead of resistor R208 ([14] on pi c. 2.6.2).
p) Solder wires Nr. 8 and 9 “+5V“ to by that time unused soldering pad “40“ ([8,9] on pic . 2.6.2).

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
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q) Solder w ires Nr. 10 a 11 “GND “ to by that time unused solderi ng pad “38“ ( [10,11] on pic .
2.6.2).
r) Solder wi re Nr. 12 „+15V“ to by that ti me unused soldering pad “39“ ([12] on pic. 2.6.2).
2.7. AUDIO-CABLE INSTALLATION
a) Free end of the audio-cable (shielded cable from the interface accessory) will be connected to
VO LUME potentiometer on i ns trument’s front panel (pic . 2.7.1).
b) Unsolder hot wire of green shielded cable from right lead of the potentiometer (pic. 2.7.2).
P ic. 2.7.1 Pic. 2.7.2
c) Place heat-shrink insulation tube φ 2 mm (fr om the interfac e access or y) on white w ire of audio-
cable and solder hot wire of green shielded cable freed from the potenti ometer to it.
d) Isolate the connection with the insulation tube and heat it (wi th a hot-flue pis tol for example)
until it shrinks ti ghtly to the c ables (pic. 2.7.3).
e) Solder red wir e of the audi o-cable to freed right lead of the potentiometer (pic. 2.7.4).
f) Solder shielding of audio-cable to left lead of VOLUME potentiometer to whi ch s hielding of
origi nal shielded cables are already connected (pic . 2.7.4).
P ic. 2.7.3 Pic. 2.7.4
2.8. FIN IS HIN G OF IN STALLATION
a) Put rear instrument’s panel back to chassis and fix it with four original screws (pic. 2.8.1).
b) Screw back earth solder lug of mains cable to instrument’s chassis using original screw,
was hers and nut ([A] on pi c. 2.8.2) .
c) Solder back black and w hite w ires to terminal plate on rear panel ([B] on pic. 2.8.2).

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
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P ic. 2.8.1 Pic. 2.8.2
d) P lug connector of newly ins talled flat c able of control s ignals to the i nterfac e board ([A] on pic .
2.8.3).
e) Plug connector of newly installed flat cable of trigger signals (leadi ng fr om sound generators
board VG-12) to the interface board ([B] on pic . 2.8.3).
f) Plug connec tor of newly ins talled audio-c able (leading from VOLUME potentiometer) to the
interface board ([C ] on pic. 2.8.3).
g) Plug jumper on the interface board to position “68“ (pic. 2.8.4).
P ic. 2.8.3 Pic. 2.8.4
h) Insert Jack connectors boars (OP-102) to original position on instrument’s rear panel. Fix the
board with original nuts of Jack connectors. D on’t forget to insert the insulati on washer s (pi c. 2.8.5)!
i) Align wires of c ontrol signals flat cable and audio- c able near by origi nal i ns trument’s cabling
and fi x them wi th a help of plas tic s tri pes from the interface accessory (pi c. 2.8.6).
Pic. 2.8.5 Pic. 2.8.6

CRX8-M MIDI Interface for Roland CR-68 / CR-78 Model 8-449 ver. 1.0
Copyright © 2013 CHD Elektroservis . All rights reserved.
No part of this publicat ion may be reproduced in any form wit hout t he written permission of CHD Elektroservis.
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j) Get removed knobs back onto potentiometer TEMPO and rotary selectors VARIATION on
instrument’s front panel.
k) Intromit chassis of the instrument back to cover (pic. 2.8.7).
l) Fix the cover from bottom side with a help of four original sc rews (pic. 2.8.8).
P ic. 2.8.7 Pic. 2.8.8
Installation of the MID I interface k it is now fini shed and the CR-68 instrument is prepared for
communication via MIDI bus.
Please read carefully user manual of the interface before usage of modified instrument.
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