Page 1

SERVICE MANUALBPM-1

PROFESSIONAL AUTOMATIC BEAT COUNTER

CONTENT’S:Connections & Operations:.......................................................Page 2-3

Specifications:..............................................................................Page 3

Parts Lists:.................................................................................Page 3-4

PCBs:..........................................................................................Page 5-6

Schematics:..................................................................................Page 7

Gemini Sound Products Corp.120 Clover Place P.O. Box 6928

Edison, NJ 08818-6928732-738-9003 (Phone) • 732-738-9006 (Fax)

Page 2

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2019

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Page 3

Connections1. Make sure that the POWER (13) switch is in the off position. The

POWER LED (14) will be off. This unit comes supplied with a 15 voltAC adaptor. Plug the adaptor into the rear panel power jack. Then plugthe adaptor into a proper power source.

2. Use the 4 stereo PHONO/LINE (2, 5, 8, 11) inputs on the rear panel toconnect to the output of your sources. The PH1/LN1 (12) switchenables you to set the CHANNEL 1 (11) input sensitivity to Phono orLine. The PH2/LN2 (9) switch enables you to set the CHANNEL 2 (8)input sensitivity to Phono or Line. The PH3/LN3 (6) switch enables youto set the CHANNEL 3 (5) input sensitivity to Phono or Line. The PH4/LN4 (3) switch enables you to set the CHANNEL 4 (2) input sensitivityto Phono or Line. Note: When using turntables, don’t forget to connectthe ground wire from your tuntable to the ground screw of your mixer.

3. The BPM-1 is supplied with 4 sets of OUTPUT (1, 4, 7, 10) jacks. If youare using a turntable and have the input set to phono, thecorresponding output must be connected to phono inputs on yourmixer. If you have the input set to line, the corresponding output mustbe connected to line inputs on your mixer. Use the CHANNEL 1OUTPUT (10) jacks to connect to the appropriate inputs on your mixer.Use the CHANNEL 2 OUTPUT (7) jacks to connect to the appropriateinputs on your mixer. Use the CHANNEL 3 OUTPUT (4) jacks toconnect to the appropriate inputs on your mixer. Use the CHANNEL 4OUTPUT (1) jacks to connect to the appropriate inputs on your mixer.

Operation1. POWER ON: Once you have made all the equipment connections, press

POWER (13). The power will turn on and the POWER LED (14) willglow RED. When you turn on the BPM-1, the unit will run through aninitialization period in which the BPM DISPLAYS (17, 19) and the BEATOFFSET INDICATORS (18) will flash. When the flashing stops, the unitis ready for use.

2. The ASSIGN (16, 21) buttons allow you to select which channel will bedisplayed on each side of the BPM-1. Press the ASSIGN (16) button toselect channel 1, 2, 3 or 4 to be displayed on the left BPM DISPLAY(17). The ASSIGN LED (15) will indicate the channel you selected.Press the ASSIGN (21) button to select channel 1, 2, 3 or 4 to bedisplayed on the right BPM DISPLAY (19). The ASSIGN LED (20) willindicate the channel you selected.

3. BPM DISPLAY: There are BPM DISPLAYS (17, 19) for each side of theBPM-1. They update approximately every 2.5 seconds and digitallydisplay the Beats Per Minute allowing you to match the beats visually.BPM DISPLAY (17) reflects the Beats Per Minute of the channelassigned to the left side of the unit, and BPM DISPLAY (19) reflectsthe Beats Per Minute of the channel assigned to the right side of theunit.

NONONONONOTETETETETE: A [- -] reading will appear on the BPM DISPLAY if thetrack has unclear beats. The [- -] reading will also appear ifthere is no signal present.

4. The BEAT OFFSET INDICATORS (18) light when the tracks of the twochannels assigned to the crossfader are within 11 BPMs of each otherand display how aligned the beats of the two channels are. When theRED LEDs light, the beats are not aligned. When the YELLOW LEDslight, the beats are almost aligned. When the GREEN LED lights, thebeats are aligned perfectly.

NONONONONOTETETETETE: If the difference between the two channel’s beatsexceed 11 BPM, the BEAT OFFSET INDICATORS will notlight.

SUGGESTION: You can use the BPM DISPLAYS to determine whichtracks have similar or the same Beats Per Minute. When mixing two trackswith similar Beats Per Minute, you can use one source’s pitch control toalign the Beats Per Minute with the other source’s BPM. The BPMDISPLAYS and the BEAT OFFSET INDICATORS update every 2.5seconds and will reflect the change in BPM and indicate when the beatsare aligned.

NONONONONOTETETETETE: Beat mixing is a skill that requires practice. Notevery track has a strong beat, and beat mixing works bestwith tracks that have clear and strong beats.

Specifications

INPUTS:Phono......................................................................................3 mV 3 MOhmLine.....................................................................................150 mV 3 MOhm

OUTPUTS:Input/Output Resistance..................................................................<0.1 OhmGENERAL:BPM Range.............................................................................60 - 180 BPMPower Adapter...........................................................115V/15V AC 500 mA

230V/15V AC 500 mADimensions......................................19”w x 1.75”h x 3”d (483 x 44 x 78 mm)Weight.....................................................................................3 lbs (1.5 kg)

Description Part #

Cabinet Parts and Packing

123456789

101112131415

Item #

Parts Lists

031-032021-461002-571003-732003-372049-190196-061255-131157-962110-166121-003A110-172A111-044A111-046A131-057

CASECHASSISKNOB PUSHHOLDER LED (3ø 6.5mm)PLATE DISPLAY (SMALL)CLIP WIRESERIAL NO. LABELGIFT BOXOWNER’S MANUALBAND-HEAD TAPPING SCREW (TWIN)BAND-HEAD TAPPING SCREW/TW-EBAND-HEAD TAPPING SCREW (TWIN)BAND-HEAD TAPPING SCREW ( “NUT” )BAND-HEAD TAPPING SCREWNUT/WASHER

262-239262-240

PRINTED CIRCUIT BOARD BPM1-1PRINTED CIRCUIT BOARD BPM1-2

Description Part #

Printed Circuit BoardsItem #

12

Page 4

074-155074-157

INTEGRATED CIRCUIT M66313FPINTEGRATED CIRCUIT SC87C51CCN40

IC5IC1

Designators Description Part #

ICsItem #

12

Parts Lists - Meter PCB

079-027079-003161-169081-027

RECTIFIER DIODE 1N4002 (1N4003,1N4004)SILICON DIODE 1N41484P RCA JACKSLIDE SWITCH 2P2C PH/LN

D18D8-10, D12-14J1-4SW1-4

Designators Description Part #

Electrical PartsItem #

1234

074-011074-074

INTEGRATED CIRCUIT UPC324INTEGRATED CIRCUIT NJM7805FA

IC2, IC3, IC4, IC8IC7

Designators Description Part #

ICsItem #

12

Parts Lists - Main PCB

080-102080-003

080-062080-063082-041052-018

LED NUMERIC DISPLAYLIGHT EMITTING DIODE (RED) 3ø

LIGHT EMITTING DIODE (YELLOW) 3øLED (GREEN) 3øTACT SWITCHCERAMIC RESONATOR 12 MHz

A, BD1-2, D6-7, D20-27, D30D3, D5D4SWA, SWBXT1

Designators Description Part #

Electrical PartsItem #

12

3456

Page 1

SERVICE MANUALBPM-1

PROFESSIONAL AUTOMATIC BEAT COUNTER

CONTENT’S:Connections & Operations:.......................................................Page 2-3

Specifications:..............................................................................Page 3

Parts Lists:.................................................................................Page 3-4

PCBs:..........................................................................................Page 5-6

Schematics:..................................................................................Page 7

Gemini Sound Products Corp.120 Clover Place P.O. Box 6928

Edison, NJ 08818-6928732-738-9003 (Phone) • 732-738-9006 (Fax)

Page 2

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21

2019

21 1

2

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54 4

5

6

87 7

8

9

1110 10

11

12

13

14

16

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Page 3

Connections1. Make sure that the POWER (13) switch is in the off position. The

POWER LED (14) will be off. This unit comes supplied with a 15 voltAC adaptor. Plug the adaptor into the rear panel power jack. Then plugthe adaptor into a proper power source.

2. Use the 4 stereo PHONO/LINE (2, 5, 8, 11) inputs on the rear panel toconnect to the output of your sources. The PH1/LN1 (12) switchenables you to set the CHANNEL 1 (11) input sensitivity to Phono orLine. The PH2/LN2 (9) switch enables you to set the CHANNEL 2 (8)input sensitivity to Phono or Line. The PH3/LN3 (6) switch enables youto set the CHANNEL 3 (5) input sensitivity to Phono or Line. The PH4/LN4 (3) switch enables you to set the CHANNEL 4 (2) input sensitivityto Phono or Line. Note: When using turntables, don’t forget to connectthe ground wire from your tuntable to the ground screw of your mixer.

3. The BPM-1 is supplied with 4 sets of OUTPUT (1, 4, 7, 10) jacks. If youare using a turntable and have the input set to phono, thecorresponding output must be connected to phono inputs on yourmixer. If you have the input set to line, the corresponding output mustbe connected to line inputs on your mixer. Use the CHANNEL 1OUTPUT (10) jacks to connect to the appropriate inputs on your mixer.Use the CHANNEL 2 OUTPUT (7) jacks to connect to the appropriateinputs on your mixer. Use the CHANNEL 3 OUTPUT (4) jacks toconnect to the appropriate inputs on your mixer. Use the CHANNEL 4OUTPUT (1) jacks to connect to the appropriate inputs on your mixer.

Operation1. POWER ON: Once you have made all the equipment connections, press

POWER (13). The power will turn on and the POWER LED (14) willglow RED. When you turn on the BPM-1, the unit will run through aninitialization period in which the BPM DISPLAYS (17, 19) and the BEATOFFSET INDICATORS (18) will flash. When the flashing stops, the unitis ready for use.

2. The ASSIGN (16, 21) buttons allow you to select which channel will bedisplayed on each side of the BPM-1. Press the ASSIGN (16) button toselect channel 1, 2, 3 or 4 to be displayed on the left BPM DISPLAY(17). The ASSIGN LED (15) will indicate the channel you selected.Press the ASSIGN (21) button to select channel 1, 2, 3 or 4 to bedisplayed on the right BPM DISPLAY (19). The ASSIGN LED (20) willindicate the channel you selected.

3. BPM DISPLAY: There are BPM DISPLAYS (17, 19) for each side of theBPM-1. They update approximately every 2.5 seconds and digitallydisplay the Beats Per Minute allowing you to match the beats visually.BPM DISPLAY (17) reflects the Beats Per Minute of the channelassigned to the left side of the unit, and BPM DISPLAY (19) reflectsthe Beats Per Minute of the channel assigned to the right side of theunit.

NONONONONOTETETETETE: A [- -] reading will appear on the BPM DISPLAY if thetrack has unclear beats. The [- -] reading will also appear ifthere is no signal present.

4. The BEAT OFFSET INDICATORS (18) light when the tracks of the twochannels assigned to the crossfader are within 11 BPMs of each otherand display how aligned the beats of the two channels are. When theRED LEDs light, the beats are not aligned. When the YELLOW LEDslight, the beats are almost aligned. When the GREEN LED lights, thebeats are aligned perfectly.

NONONONONOTETETETETE: If the difference between the two channel’s beatsexceed 11 BPM, the BEAT OFFSET INDICATORS will notlight.

SUGGESTION: You can use the BPM DISPLAYS to determine whichtracks have similar or the same Beats Per Minute. When mixing two trackswith similar Beats Per Minute, you can use one source’s pitch control toalign the Beats Per Minute with the other source’s BPM. The BPMDISPLAYS and the BEAT OFFSET INDICATORS update every 2.5seconds and will reflect the change in BPM and indicate when the beatsare aligned.

NONONONONOTETETETETE: Beat mixing is a skill that requires practice. Notevery track has a strong beat, and beat mixing works bestwith tracks that have clear and strong beats.

Specifications

INPUTS:Phono......................................................................................3 mV 3 MOhmLine.....................................................................................150 mV 3 MOhm

OUTPUTS:Input/Output Resistance..................................................................<0.1 OhmGENERAL:BPM Range.............................................................................60 - 180 BPMPower Adapter...........................................................115V/15V AC 500 mA

230V/15V AC 500 mADimensions......................................19”w x 1.75”h x 3”d (483 x 44 x 78 mm)Weight.....................................................................................3 lbs (1.5 kg)

Description Part #

Cabinet Parts and Packing

123456789

101112131415

Item #

Parts Lists

031-032021-461002-571003-732003-372049-190196-061255-131157-962110-166121-003A110-172A111-044A111-046A131-057

CASECHASSISKNOB PUSHHOLDER LED (3ø 6.5mm)PLATE DISPLAY (SMALL)CLIP WIRESERIAL NO. LABELGIFT BOXOWNER’S MANUALBAND-HEAD TAPPING SCREW (TWIN)BAND-HEAD TAPPING SCREW/TW-EBAND-HEAD TAPPING SCREW (TWIN)BAND-HEAD TAPPING SCREW ( “NUT” )BAND-HEAD TAPPING SCREWNUT/WASHER

262-239262-240

PRINTED CIRCUIT BOARD BPM1-1PRINTED CIRCUIT BOARD BPM1-2

Description Part #

Printed Circuit BoardsItem #

12

Page 4

074-155074-157

INTEGRATED CIRCUIT M66313FPINTEGRATED CIRCUIT SC87C51CCN40

IC5IC1

Designators Description Part #

ICsItem #

12

Parts Lists - Meter PCB

079-027079-003161-169081-027

RECTIFIER DIODE 1N4002 (1N4003,1N4004)SILICON DIODE 1N41484P RCA JACKSLIDE SWITCH 2P2C PH/LN

D18D8-10, D12-14J1-4SW1-4

Designators Description Part #

Electrical PartsItem #

1234

074-011074-074

INTEGRATED CIRCUIT UPC324INTEGRATED CIRCUIT NJM7805FA

IC2, IC3, IC4, IC8IC7

Designators Description Part #

ICsItem #

12

Parts Lists - Main PCB

080-102080-003

080-062080-063082-041052-018

LED NUMERIC DISPLAYLIGHT EMITTING DIODE (RED) 3ø

LIGHT EMITTING DIODE (YELLOW) 3øLED (GREEN) 3øTACT SWITCHCERAMIC RESONATOR 12 MHz

A, BD1-2, D6-7, D20-27, D30D3, D5D4SWA, SWBXT1

Designators Description Part #

Electrical PartsItem #

12

3456

Page 5

Main PCB

Page 6

Meter PCB

Schematic

POWER

POWER

SW5

X8X7

X4

2

1

J10

MAIN PCB

METER PCB

563

C33

563

C32

X1

2

1

332

C56

332

C1

b2bb2f

b2ab2gb3cb3bb3fb3ab3ga2fa2ba3ba3fa3aa3ga2aa2ga3da3e

b2cb2eb2db1b,1cb3db3ea2ca2ea2da1b.1c

a3c

VCC

CH ACH B

R

L

VCC

LEDD30

750R121

X12

2 1

X11

2 1

21

VCC

104C101

104

C100

P27

P26

P25

P24

P23

P22

P21

P27P26P25P24P23P22P21

VCC

510R120

LED4B

LED3B

LED2B

LED1B

LED1A

LED2A

LED3A

LED4A

LED4BLED3BLED2BLED1BLED1ALED2ALED3ALED4A

VCC

510R119

LED

D27

LED

D26

LED

D25

LED

D24

LED

D23

LED

D22

LED

D21

LED

D20

VCC

SWB

SWA

SWA

SWB

SWB

SWA

A4

A3

A2

A1

B4

B3B2

B1

B4B3B2B1 A4A3A2A1

X3

VCC

470

R78

470

R77

470

R76

240R80

470

R75

470

R74

470

R73

470

R72

470

R71

470

R70

240

R79

470

R69

470

R68

470

R67

470

R66

470

R65

470

R64

470

R63

470

R62

470

R61

470

R60

470

R59

470

R58

470

R57

470

R56

470

R55470

R54

470

R53

470

R52

470

R51

M66313FP

IC5

10OE

14SQ32

13CK

9A

11LE

12SD

20Q32

19Q31

18Q30

17Q29

16Q28

15Q27

22Q26

23Q25

24Q24

25Q23

26Q22

27Q21

28Q20

29Q19

30Q18

31Q17

33Q16

34Q15

35Q14

36Q13

37Q12

38Q11

39Q10

40Q9

41Q8

42Q7

7Q6

6Q5

5Q4

4Q3

3Q2

2Q1

VCC

32

31

30

2928

27

26

25

24

23

22

2019

18

15

14

13

1211

10

9

8

7

6

54

3

2

1

32

3130

29 2827

2625 24 23

2221 20

19 18

15

1413

12 1110

98 7 6

54 3

2 1

BT-A41B

1b

1c

3g3f

3e3d

3c

3b3a

2g2f

2e2d

2c

2b2a

BT-A41A

1b

1c

3g3f

3e3d

3c

3b3a

2g2f

2e2d

2c

2b2a

510R10

LED

D7

LED

D6

LED

D5

LED

D4

LED

D3

LED

D2

LED

D1

VCC

VCC

10KR1

10/10C11

47pFC10

47pFC9

12MXT1

8051

IC1

10RXD

11TXD

30ALE/P

29PSEN

28P27

27P26

26P25

25P24

24P23

23P22

22P21

21P20

32P07

33P06

34P05

35P04

36P03

37P02

38P01

39P00

8P17

7P16

6P15

5P14

4P13

3P12

2P11

1P10

15T1

14T0

13INT1

12INT0

16WR

17RD

9RESET

18X2

19X1

31EA/VP

1N4004

D18

X63 2 1

SW4A1

32

SW3A1

32

SW2A1

32

SW1A1

32

AB

AB

B

A

1/2VCC

1/2VCC

SW4B4

65

47/10

C43

682

C31

300K

R88

240R118

300K

R87

SW3B4

65

47/10

C42

682

C30

300K

R86

240R117

300K

R85

SW2B4

65

47/10

C41

682

C29

300K

R84

240R116

300K

R83

J4B

2G

2R

2L

J4A

1G

1R

1L

J3B

2G

2R

2L

J3A

1G

1R

1L

VCCX5 2 1

VCC

OA4

IC8D

411

1413

12

OA4

IC8C

411

89

10

OA4

IC8B

411

75

6

OA4

IC8A

411

13

2

R4R3R2R1 L4L3L2L1

R4

R3

R2

R1

L4

L3

L2

L1

CH4

CH3

CH2

CH1

470/25C38

1/2VCC

470/10

C406K2R9

10KR8

VCC

1.0/10C36

7805IC7

3Vout

2GN

D

1Vin

X2

4.7/25

C55

4.7/25

C54

1/2VCC

1/2VCC

100K

R115

100K

R114

100K

R113

100KR112

100K

R111

100KR110

1/2VCC

3M3

R96

3M3

R95

J2B

2G

2R

2L

100K

R109

100KR108

100K

R107

100KR106

1/2VCC

3M3

R94

3M3

R93

J2A

1G

1R

1L

100K

R105

100KR104

100K

R103

100KR102

1/2VCC

3M3

R92

3M3

R91

J1B

2G

2R

2L

100K

R101

100KR100

100K

R99

100KR98

1/2VCC

SW1B4

65

47/10

C39

682

C28

300K

R82

240R97

3M3

R90

3M3

R89

300K

R81J1A

1G

1R

1L

Vcc

100KR40

5K1R48

6K2R6

1K1R46

330KR43

100KR39

10KR5

1MR36

470KR34

104

C19471

C27

2.2/16C25

4.7/10C23

1N4148

D15

1N4148

D14

1N4148

D13

1N4148

D12

47/6.3C3 22K

R32

22KR31

1K

R18

6.8K

R28

68KR26

680KR24

181

C21

104

C18

104C17

104

C16

Vcc

91KR22

1KR16

9.1K

R20

LM324A

IC4D

411

1413

12

LM324A

IC4C

411

89

10LM324A

IC4B

411

75

6

LM324A

IC4A

411

13

2

LM324A

IC3D

411

1413

12

LM324A

IC3C

411

89

10

Vcc

100KR38

330KR41

100KR37

10KR2

1MR35

470KR33

104

C15471

C26

2.2/16C24

4.7/10C22

1N4148

D11

1N4148

D10

1N4148

D9

1N4148

D8

47/6.3C2 22K

R30

22KR29

1K

R14

6.8K

R27

68KR25

680KR23

181

C20

104

C14

104C13

104

C12

Vcc

91KR21

1KR12

9.1K

R19

LM324A

IC3B

411

75

6

LM324A

IC3A

411

13

2LM324AIC2D

411

1413

12

LM324A

IC2C

411

89

10

LM324A

IC2B

411

75

6

LM324A

IC2A

411

13

2

104C8

104C7

104C6

104C5

104C4

VCC

Worldwide Headquarters • 120 Clover Place, Edison, NJ 08837 • USATel: (732) 738-9003 • Fax: (732) 738-9006

France • G.S.L. France • 11, Avenue Leon Harmel, Z.I. Antony, 92160 Antony, FranceTel: + 33 (0) 1 55 59 04 70 • Fax: + 33 (0) 1 55 59 04 80

Germany • Gemini Sound Products GmbH • Ottostrasse 6, 85757 Karlsfeld, GermanyTel: 08131 - 39171-0 • Fax: 08131 - 39171-9

UK • Gemini Sound Products • Unit C4 Hazleton Industrial Estate, Waterlooville, UK P08 9JUTel: 087 087 00880 • Fax: 087 087 00990

Spain • Gemini Sound Products S.A. • Rosello, 516, Barcelona, Spain, 08026Tel: 349-3435-0814 • Fax: 3493-347-6961

© Gemini Sound Products Corp. 2002 All Rights Reserved

Parts of the design of this product may be protected by worldwide patents.Information in this manual is subject to change without notice and doesnot represent a commitment on the part of the vendor. Gemini SoundProducts Corp. shall not be liable for any loss or damage whatsoeverarising from the use of information or any error contained in this manual.No part of this manual may be reproduced, stored in a retrieval system ortransmitted, in any form or by any means, electronic, electrical, mechanical,optical, chemical, including photocopying and recording, for any purposewithout the express written permission of Gemini Sound Products Corp.It is recommended that all maintenance and service on this product isperformed by Gemini Sound Products Corp. or its authorized agents.Gemini Sound Products Corp. will not accept liability for loss or damagecaused by maintenance or repair performed by unauthorized personnel.

In the USA: If you experience problems with this unit,call 1-732-738-9003 for Gemini Customer Service.

Do not attempt to return this equipment to your dealer.