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Akai UNIBASS UB1 Service Manual

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SPECIFICATIONS
Functions: ......................... SELECT - ADD LOWER 4TH, SOLO, ADD UPPER 5TH SWITCH MODE - LATCH,
Connectors: ...................... INPUT (Input impedance: 500k ohms or more)
Controls: ............................ INPUT LEVEL, TONE, DISTORTION, OUTPUT LEVEL, NOISE GATE THRESHOLD,
Indicator: ........................... LED x3 (Input Level)
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
UN LATCH
MIX (Output impedance: 1k ohms or less)
EFFECT (Output impedance: 1k ohms or less)
DC IN (9 Volts)
SWITCH MODE, SELECT, FOOTSWITCH (EFFECT on/off, MODIFY on/off) x 2
LED x2 (Effect on/off, MODIFY on/off)
SERVICE MANUAL
UNIBASS UB1
1

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Summary of Contents for Akai UNIBASS UB1

  • Page 1 Harmonized Bass Distortion UNIBASS UB1 MODEL SPECIFICATIONS 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)

  • Page 2: Safety Check After Servicing

    # INFORMATIONS # SAFETY INSTRUCTIONS 1. Parts identified by the } symbol are critical for safety. SYMBOLS FOR PRIMARY DESTINATION Replace them only with the parts number specified. Unit destinations are indicated with letters as shown below. 2. In addition to safety, other parts and assemblies are Symbols Principal Destinations specified for conformance with such regulations as those...

  • Page 3: Supplementary Information

    SUPPLEMENTARY INFORMATION About the UB1 test mode This test mode is used to confirm operations from the SWITCH MODE and SELECT switches up to the micro computer (IC4 HD6433641RB15H). Test mode operation While pressing down on both foot switches, turn on the power. (Plug in the DC power plug). All LEDs will flash 4 times and the test mode will then be engaged.
  • Page 4 OUTPUT NOISE GATE INPUT LEVEL DISTORTION TONE THRESHOLD LEVEL SELECT SWITCH MODE MODIFY ON/OFF DCIN SCHEMATIC DIAGRAM...

  • Page 6: How To Use This Parts List

    PARTS LIST ATTENTION 1. When placing an order for parts, be sure to list the Part No., Model No. and the description of each part. Otherwise, the non-delivery of the part or the delivery of a wrong part may result. 2.
  • Page 7 1. PC BOARD BLK UB1 2. PC FINAL ASSEMBLY BLK UB1 Ref. No. Part No. Description Ref. No. Part No. Description SP-812829J PANEL MAIN UB1 BA-L8012A020A PC(#) UB1 BLK UB1 SK-812205J KNOB SLIDE PC(#) UB1 BLK CONSISTS OF FOLLOWING PC BOARDS SM-812280J MASK KNOB •...
  • Page 8 FINAL ASSEMBLY BLK UB1 SERVICE MANUAL...
  • Page 9 ABBREVIATIONS FOR THE SERVICE MANUAL ABBREVIATION EXPLANATION ABBREVIATION EXPLANATION AMP (Amp) AMPlifier MINI MINImum Backet Brigade Diode MIXer Binary Code Decimal MODulation / MODulator B.DOWN Brake DOWN M.WHEEL Modulation WHEEL B.UP Back UP OSCillator Chip Enable Programmable Logic Device CHannel Random Access Memory COMP COMParator...