Roland PX-7B Operating and maintenance manual

SERVICE NOTES
Issued by RJA
Copyright © 2013 Roland Corporation
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of Roland Corporation.
CC-KWS17058887E0
Oct. 2013 PX-7B, PX-7C
PX-7B
PX-7C
Table of Contents
Keyboard Parts List (PX-7B) ............................................2
Keyboard Parts List (PX-7C)............................................3
Keyboard Assembly Procedure ......................................4
Circuit Board (Low, Mid).................................................9
Circuit Board (High) .......................................................12
Circuit Diagram (Low) ...................................................14
Circuit Diagram (Mid)....................................................16
Circuit Diagram (High) ..................................................18
This service note contains information about repair parts and the repair method of the keyboard section.
For other sections of each model, please refer to each service note.
Revise Information
Dec. 2, 2013 p. 6 Changed grease.
May. 24, 2016 p. 2 Added parts.
Jul. 29. 2016 p. 3 Added the PX-7C keyboard parts list.
Aug. 10, 2016 p. 3 Changed a part code.

2
Oct. 2013 PX-7B, PX-7C
Keyboard Parts List (PX-7B)
fig.key-PX-7B.eps
9821
37
18
6
5
4
10 9
11
1217 13
14
15
1619 16
No. Part Code Part Name Description Q’ty
5100034009 KEYBOARD ASSY PX-7B
1 5100016416 N-KEY C PX-7 (C6200269R0) 7
5100016417 N-KEY D PX-7 (C6200270R0) 7
5100016418 N-KEY E PX-7 (C6200271R0) 7
5100016419 N-KEY F PX-7 (C6200272R0) 7
5100016420 N-KEY G PX-7 (C6200273R0) 7
5100016421 N-KEY A PX-7 (C6200274R0) 7
5100016422 N-KEY B PX-7 (C6200275R0) 8
5100016423 N-KEY A DASH PX-7 (C6200276R0) 1
5100016424 N-KEY C DASH PX-7 (C6200277R0) 1
2 5100016425 S-KEY PX-7 (C6200278R0) 36
3 5100016251 HAMMER-1 FOR N-KEY PX-7 (61100160) 13
5100016252 HAMMER-2 FOR N-KEY PX-7 (61100170) 13
5100016253 HAMMER-3 FOR N-KEY PX-7 (61100180) 13
5100016254 HAMMER-4 FOR N-KEY PX-7 (61100190) 13
5100016255 HAMMER-1 FOR S-KEY PX-7 (611001A0) 9
5100016256 HAMMER-2 FOR S-KEY PX-7 (611001B0) 9
5100016257 HAMMER-3 FOR S-KEY PX-7 (611001C0) 9
5100016258 HAMMER-4 FOR S-KEY PX-7 (611001D0) 9
4******** CHASSIS 88P PX-7 1
5******** SUB CHASSIS 12P PX-7 7
******** SUB CHASSIS 4P PX-7 1
6******** GUIDE HOLDER PX-7 1
7 5100016412 KEYBOARD HOLDER PX-7 (C6300217R0) 6
8 5100016262 GUIDE BUSHING PX-7 88
9 5100019110 KEY CUSHION A PX-7 (C5000254R0) 2
10 5100019663 KEY CUSHION B PX-7 1
11 5100028252 KEY CUSHION E PX-7 1
12 5100019111 HAMMER CUSHION A PX-7 1
13 5100019664 HAMMER CUSHION B PX-7 1
14 5100037315 PWB SET PX-7B 1
15 40011056 SCREW 3X6 BINDING TAPTITE B ZC 12
16 40011312 SCREW 3X8 BINDING TAPTITE P FE BZC 52
17 40012256 SCREW 3X10 BINDING TAPTITE B FE ZC 60
18 5100033937 FLAT CABLE A-1.0-20X230-4/8-0.7X0.05 2
19 5100047674 RUBBER SWITCH 12P 8

3
Oct. 2013 PX-7B, PX-7C
Keyboard Parts List (PX-7C)
fig.key-PX-7C.eps
9821
37
18
6
5
4
10 9
11
1217 13
14
15
1619 16
No. Part Code Part Name Description Q'ty
5100053166 KEYBOARD ASSY PX-7C SV SERVICE ASSY
5100054674
1 5100046363 N-KEY C PX-7C 7
5100046364 N-KEY D PX-7C 7
5100046365 N-KEY E PX-7C 7
5100046366 N-KEY F PX-7C 7
5100046367 N-KEY G PX-7C 7
5100046361 N-KEY A PX-7C 7
5100046362 N-KEY B PX-7C 8
5100046368 N-KEY A DASH PX-7C 1
5100046369 N-KEY C DASH PX-7C 1
2 5100046370 S-KEY PX-7C 36
3 5100048710 HAMMER-1 FOR N-KEY PX-7C 13
5100048711 HAMMER-2 FOR N-KEY PX-7C 13
5100048712 HAMMER-3 FOR N-KEY PX-7C 13
5100048713 HAMMER-4 FOR N-KEY PX-7C 13
5100048714 HAMMER-1 FOR S-KEY PX-7C 9
5100048715 HAMMER-2 FOR S-KEY PX-7C 9
5100048716 HAMMER-3 FOR S-KEY PX-7C 9
5100048717 HAMMER-4 FOR S-KEY PX-7C 9
4******** CHASSIS 88P PX-7 1
5******** SUB CHASSIS 12P PX-7 7
******** SUB CHASSIS 4P PX-7 1
6******** GUIDE HOLDER PX-7 1
7 5100046729 KEYBOARD HOLDER PX-7C 6
8 5100046717 GUIDE BUSHING PX-7C 88
9 5100048726 KEY STOP CUSHION A PX-7C 2
10 5100019663 KEY CUSHION B PX-7 1
11 5100048727 KEY STOP CUSHION B PX-7 1
12 5100019111 HAMMER CUSHION A PX-7 1
13 5100019664 HAMMER CUSHION B PX-7 1
14 5100048968 PWB SET PX-7C 1
15 40011056 SCREW 3X6 BINDING TAPTITE B ZC 12
16 40011312 SCREW 3X8 BINDING TAPTITE P FE BZC 52
17 40012256 SCREW 3X10 BINDING TAPTITE B FE ZC 60
18 5100048969 FLAT CABLE SML2CD-20X222-BDX8(BL)-P1.0-S4 2
19 5100047674 RUBBER SWITCH 12P 8

4
Oct. 2013 PX-7B, PX-7C
Keyboard Assembly Procedure
Removing the Key
Insert the tip of needle nose pliers into the U-groove on the pivot side and push in the direction of arrow A.
*Before removing black keys, first be sure to remove the adjacent white keys.
*Take care to ensure that the grease applied to the pivot area is not adhered to the rubber switch.
fig.key-release-e.eps
Installing the Key
While hooking the foot of the key under the cushion, align the inner wall of the key with the guide, place it as shown in the figure, and press the area shown by the
dotted line in the direction of the arrow until it engages with the pivot with an audible click.
*Before installing white keys, first be sure to install the adjacent black keys.
fig.key-set-e.eps
A
A
Needle nose pliers
Rubber switch
Cushion
Guide
Pivot

5
Oct. 2013 PX-7B, PX-7C
Installing the Circuit Board
1.Peel off the backing paper of all the double-sided adhesive tape on the circuit board.
2.Align the notch of the circuit board with the tab on the sub-chassis and press the circuit board to the depth of the notch.
3.First, fasten with screws in the round holes.
Set the round holes in the circuit board on the center of the screw holes in the sub-chassis and secure in place.
4.Fasten screws in the slotted holes.
fig.PWB-set-1-e.eps
Sandwich the circuit board.
Position using the notch.
Press in until flush.
#40011312: P-TITE BIND 3X8

6
Oct. 2013 PX-7B, PX-7C
Application of Grease
Greasing Points
After the key or hammer has been replaced, the specified grease must be applied to the following points as shown in the figure.
fig.key-grease.eps
1.MORICOAT G-1039...........pink (#17041858)
(a) Key pivot
(b) Hammer pivot
(c) Contact between sharp key and hammer (actuator area)
2.FLOIL G-336A............white (#17049543)
(a) Key guide
(b) Contact between natural key and hammer (actuator area)
The Reasonable Amount of Grease
fig.key-grease-1a.eps
1-(a) Key pivot
fig.key-grease-1b.eps
1-(b) Hammer pivot
fig.key-grease-2b.eps
1-(c) Contact between sharp key and hammer
fig.key-grease-2a.eps
2-(a) Key guide
fig.key-grease-2b.eps
2-(b) Contact between natural key and hammer
1-(a)
1-(b) 2-(a)
1-(c), 2-(b)

7
Oct. 2013 PX-7B, PX-7C
Regarding Hammer Placement
Hammers that have differently shaped metal and plastic portions are arranged as shown in the figure below. When replacing, be very careful not to position the
hammers incorrectly.
*Installation at an incorrect location may impede key touch.
fig.key-hammer-1-e.eps
fig.key-hammer-2-e.eps
The colors of the plastic portion differ.
White key = white
Black key = black
Refer to the photos in the chart below.
The shape of the metal part differs according to the
frequency range.
Verify by comparing the stamp on the part surface
against the chart below.
PX-7 N-KEY HAMMER-1
#5100016251
#5100048710
PX-7 N-KEY HAMMER-2
#5100016252
#5100048711
PX-7 N-KEY HAMMER-3
#5100016253
#5100048712
PX-7 N-KEY HAMMER-4
#5100016254
#5100048713
PX-7 S-KEY HAMMER-1
#5100016255
#5100048714
PX-7 S-KEY HAMMER-2
#5100016256
#5100048715
PX-7 S-KEY HAMMER-3
#5100016257
#5100048716
PX-7 S-KEY HAMMER-4
#5100016258
#5100048717
A0 F#2 G2 E4 F4 D6 D#6 C8
Natural Key
Sharp Key

8
Oct. 2013 PX-7B, PX-7C
Affixing the Cushion
The cushions are of five types. Position each according to the instructions in the figure.
fig.key-cushion-e.eps
Affix with no meandering, protrusion, peeling, or the like.
If Hammer Cushion B (#5100019664) rubs against the surface, it may raise a nap. Affix pressed down from above so that no rubbing occurs.
The cushions are all cut longer than the overall length of the chassis. After affixing, trim the protruding portions.
#5100028252 or #5100048727:
KEY CUSHION E (white)
Align with the edge of the Guide Holder.
#5100019110 or #5100048726:
KEY CUSHION A (white)
Position flush against the edge
of the metal-plate chassis.
#5100019110 or #5100048726:
KEY CUSHION A (white)
Position flush against the edge
of the metal-plate chassis.
#5100019664:
HAMMER CUSHION B (white/gray, 2 layers)
Align with the edge of the opening in the chassis.
#5100019663: KEY CUSHION B (white)
Position flush against the front edge
of the plastic sub-chassis.
#5100019111:
HAMMER CUSHION A (white/gray, 2 layers)
Position flush against the front edge
of the plastic sub-chassis.

9
Oct. 2013 PX-7B, PX-7C
Circuit Board (Low, Mid)
Low
fig.b-L1.eps@L
fig.b-L2.eps@L
Mid
fig.b-M1.eps@L
fig.b-M2.eps@L

10
Oct. 2013 PX-7B, PX-7C