Bachmann GRPT140 Service Manual

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Index

Soldering point.

Male connector.

Female connector.

M/F faston connector.

Test point.

Supply voltage.

Logic supply ground.

Analog supply ground.

Chassis ground.

Earth ground.

Flag joined with one or more flags

GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. 0541/959511 - fax 0541/957404

GENERALMUSIC on the NET: http://www.generalmusic.com

Keyboard Assembly & Block Diagram

SERVICE MANUAL

L CODE: 270227 M

Warnings

with the same signal name inscribed.

Address

ATTENTION

Observe precautions when handling electrostatic sensitive devices.

Notice

Service must be carried out by qualified personnel only.Any tampering carried out by unqualified personnel during the guarantee period

will forfeit the right to guarantee.

For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.

To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.

All components marked by this symbol have special safety characteristics, when replacing any of these components use only

manufacturer's specified parts.

The (µ) micro symbol of capacitance value is substituted by U.

The (

Ω) omega symbol of resistance value is substituted by E.

The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.

All resistors are 1/8

Ω unless otherwise specified.

All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.

GRPT140

Autotest & Keyboard Calibration Procedures

Power Amplifier & Supply, Controls & Phones, Crossover, Aux & Midi I/O Boards Schematic Diagrams

Keyboard Interface & Left Optical Contact Boards Schematic Diagrams

Centre & Right Optical Contact Boards Schematic Diagrams

CPU & Sound Generator Board Schematic Diagram

Spare Part List

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Summary of GRPT140

Page 1
1 j j j j j index soldering point. Male connector. Female connector. M/f faston connector. Test point. Supply voltage. Logic supply ground. Analog supply ground. Chassis ground. Earth ground. Flag joined with one or more flags generalmusic s.P.A. Sales division: 47842 s.Giovanni in marignano (rn) it...
Page 2
J j j j j 2 keyboard assembled parts 1) key front 19) hammer "load" 2) key top 20) hammer stop rail 3) natural, white key 21) hammer sto rail felt 4) sharp, black key 22) hammer center pin 5) balance rail pin 23) hammer but spring 6) bridle wire, tape wire 24) hammer flange 7) jack spring 25) spoon ...
Page 3
3 j j j j j operations description display the following procedures must be executed subsequently in the specified order. Before turning on the instrument, check the jumpers setting on cpu & sound generator board to be corresponding to the model accordingly the following table: model j1 j2 j3 j4 grp...
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J j j j j 8 spare part list legend eu = 230vac europe version us = 115vac u.S. Version b = black gloss finish m = mahogany finish bm = briar mahogany finish baldwin = baldwin version bachmann = bachmann version code description optional accessories 130301 2mt midi cable accessories 271235 owner’s ma...