Akai UniBass UB1 Service Manual Download Page 1

SERVICE MANUAL

1

UB1

Functions: ......................... SELECT - ADD LOWER 4TH, SOLO, ADD UPPER 5TH SWITCH MODE - LATCH,

UN LATCH

Connectors: ...................... INPUT (Input impedance: 500k ohms or more)

MIX (Output impedance: 1k ohms or less)
EFFECT (Output impedance: 1k ohms or less)
DC IN (9 Volts)

Controls: ............................ INPUT LEVEL, TONE, DISTORTION, OUTPUT LEVEL, NOISE GATE THRESHOLD,

SWITCH MODE, SELECT, FOOTSWITCH (EFFECT on/off, MODIFY on/off) x 2

Indicator: ........................... LED x3 (Input Level)

LED x2 (Effect on/off, MODIFY on/off)

Power requirements: ........ 9V DC/140mA, AC adaptor MP-9
Accessories: ..................... Operator’s Manual, AC adaptor MP-9
Dimensions: ...................... 140 (W) x 175 (D) x 61 (H)mm
Weight: ............................... 720g

• Specifications are subject to change without notice.

Harmonized Bass Distortion

MODEL

UNIBASS UB1

SPECIFICATIONS

Summary of Contents for UniBass UB1

Page 1: ...trols INPUT LEVEL TONE DISTORTION OUTPUT LEVEL NOISE GATE THRESHOLD SWITCH MODE SELECT FOOTSWITCH EFFECT on off MODIFY on off x 2 Indicator LED x3 Input Level LED x2 Effect on off MODIFY on off Power requirements 9V DC 140mA AC adaptor MP 9 Accessories Operator s Manual AC adaptor MP 9 Dimensions 140 W x 175 D x 61 H mm Weight 720g Specifications are subject to change without notice Harmonized Bas...

Page 2: ...ng micro switches 5 When replacing AC primary side components trans formers power cords noise blocking capacitors etc wrap the ends of the wires securely around the terminals before soldering 6 Make sure that wires do not contact heat producing parts heat sinks oxide metal film resistors fusible resistors etc 7 Check that replaced wires do not contact sharp edged or pointed parts 8 Also check area...

Page 3: ...rn on the power Plug in the DC power plug All LEDs will flash 4 times and the test mode will then be engaged Points to be confirmed SWITCH MODE LATCH Confirm that the ON OFF LED lights red UNLATCH Confirm that the MODIFY LED lights green SELECT ADD LOWER 4th Confirm that the INPUT LEVEL LED lights green SOLO Confirm that the INPUT LEVEL LED lights yellow ADD UPPER 5th Confirm that the INPUT LEVEL ...

Page 4: ...DCIN SELECT SWITCH MODE OUTPUT LEVEL DISTORTION NOISE GATE THRESHOLD INPUT LEVEL TONE UB1 SCHEMATIC DIAGRAM MODIFY ON OFF 4 ...

Page 5: ...5 ...

Page 6: ...rt different from the one you ordered may be delivered 3 Since the parts shown in Parts List or Preliminary Service Manual may have been the subject of changes please use this Parts List for all future reference Symbols for primary destination A AAL U S A S SAA Australia B BEAB England U U T Universal Area C CSA Canada E CEE Europe V VDE Germany J JPN Japan Y Custom SP Service Parts Classification...

Page 7: ...D2 ED 811455J D SILICON H 1SS133T 77 T26 D10 ED 811455J D SILICON H 1SS133T 77 T26 100 SE 812673J SPACER LED L 12 200 SE 812672J SPACER LED L 8 5 D201 ED 812086J D LED L 934SGD GREEN D202 ED 813021J D LED L 934SYD YELLOW D203 ED 812087J D LED L 934SRD G RED D204 ED 812087J D LED L 934SRD G RED D205 ED 812086J D LED L 934SGD GREEN SW201 ES 812125J SW SLIDE SSSS913Z 4C2 0 01 03 SW202 ES 812886J SW S...

Page 8: ...SERVICE MANUAL 8 FINAL ASSEMBLY BLK UB1 12 9 7 9 7 9 7 13 11 8 7 7 5 4 6 1 10 3 2 ...

Page 9: ...odule SMPTE Society of Motion Picture Television Engineers SW SWitch THRU THRoUgh TRANS TRANSpose U Upper VA Voltage Analog VCA Voltage Controlled Amplifier VCF Voltage Controlled Filter VR Variable Resistor VREF REFerence Voltage WR WRite AMP Amp AMPlifier BBD Backet Brigade Diode BCD Binary Code Decimal B DOWN Brake DOWN B UP Back UP CE Chip Enable CH CHannel COMP COMParator CONT CONTrol CV Cont...

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