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HHB Circle 5A Service Manual

Powered monitor speaker
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Manual: Version 5.2
23.12.2001
Service manual
HHB Circle 5A
Powered Monitor speaker
with V3 electronics
This manual is subject to change without notice.
Always check with HHB that you are using the latest version.
Also available as an Adobe Acrobat V4 file.
When printing this file, for clear sharp pictures on a black & while laser, it may be necessary
to adjust your printer driver's 'Print half tone' settings. If you have a 600dpi printer, setting the
half tone to around 45 lines per inch will give a clean sharp image, where as the default -
around 60lpi may give a dark image to pictures..
WARNING! DANGER OF ELECTRICAL SHOCK
Opening mains operated equipment like the HHB Circle 5A incurs a risk of electric shock.
DO NOT attempt to open this equipment unless you are qualified to do so, have the
necessary test equipment and are operating the Circle 5A from an
ISOLATED POWER SUPPLY.
Ensure that only the correct mains voltage is applied, as marked on the module.
NEVER OPERATE OR OPEN THIS SPEAKER IN DAMP OR WET CONDITIONS AND
NEVER ALLOW IT TO BE USED OUTSIDE. ENSURE THAT ALL POWER AND SIGNAL
CABLES ARE IN PERFECT CONDITION AND ARE CORRECTLY FUSED.
IF IN DOUBT, CONTACT HHB IMMEDIATELY BEFORE PROCEEDING.
Version 5.1 03.01.02
Page 1

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Summary of Contents for HHB Circle 5A

  • Page 1 60lpi may give a dark image to pictures.. WARNING! DANGER OF ELECTRICAL SHOCK Opening mains operated equipment like the HHB Circle 5A incurs a risk of electric shock. DO NOT attempt to open this equipment unless you are qualified to do so, have the necessary test equipment and are operating the Circle 5A from an ISOLATED POWER SUPPLY.
  • Page 2 Contents Page 1: The cover and warning Page 2: (This) index page Page 3: Section 1.0: External arrangement and comments on connectors/controls Page 4: Section 2.0: General arrangement, notes on testing Page 5: Section 3.0: Access to the Circle5A electronic module Page 6: Section 4.0: General inside views of C5A module Page 7: Section 4.1...
  • Page 3 0.775V, it is expected that in most situations the Circle 5A’s vol- ume control wil be set to about half way i.e. 12 o’clock. This would apply in many studio’s where the ‘+4’...
  • Page 4: General Arrangement

    2.0 General arrangement All the signal processing circuitry of the Circle5A amplifier module is arranged on two PCB’s - one ‘passive’ board, the C5AIPM holds the XLR, selec- tor switch, volume control and phono socket. This is connected to the C5APAM (filter/PSU/power amp) board via a 6 way wire loom.
  • Page 5 Sec 3.0 Removing the Circle 5A’s Section 3.3: Removing the screws active module from the cabinet Please follow these instructions exactly. Failure to do so may well destroy your cabinet and/or It is absoluletely essential that before removing module. the module you have the necessary tools, a clear space, and sufficient uninterrupted time to work.
  • Page 6: Mains Transformer

    Sec. 4.0 General view of C5A module viewed from the inside There are four function blocks in the C5A elec- The input signal, once selected by the user tronic module: switch is sent to the C5APAM C5AIPM: a small PCB carrying the XLR, MAINS TRANSFORMER: phono,volume control and selector switch.
  • Page 7 Section 4.1 Close-up views of inside of C5A module C5AIPM: note air holes are sealed with hot glue. Wire loom connecting C5AIPM to C5APAM C5APAM...
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