Download Print this page

HHB Circle 5A Service Manual

Powered monitor speaker
Hide thumbs Also See for Circle 5A:

Advertisement

Quick Links

Manual: Version 1d
Powered Monitor speaker
This manual is subject to change without notice.
Always check with HHB that you are using the latest version.
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 -
WARNING! DANGER OF ELECTRICAL SHOCK
Opening mains operated equipment like the HHB Circle5A incurs a risk of electric
DO NOT attempt to open this equipment unless you are qualified to do so, have the neces-
sary 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
ENSURE THAT ALL POWER AND SIGNAL CABLES ARE IN PERFECT CONDITION AND
IF IN DOUBT, CONTACT HHB IMMEDIATELY BEFORE PROCEEDING.
Version 1d: 01.99
01.1999
Service manual
HHB Circle 5A
Also available as an Adobe Acrobat V3 file.
around 60lpi may give a dark image to pictures..
NEVER ALLOW IT TO BE USED OUTSIDE.
ARE CORRECTLY FUSED.
shock.
Page

Advertisement

loading

Summary of Contents for HHB Circle 5A

  • Page 1 DO NOT attempt to open this equipment unless you are qualified to do so, have the neces- sary 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.
  • Page 2 Version 1d: 01.99 Page...
  • Page 3 Contents Page 1: The cover and warning Page 2: Section 1.0 External arrangement and comments on connectors/controls Page 3: General arrangement, notes on testing Page 4: Opening the Circle5A Page 5: Circuit diagram: active filters Page 6: Circuit diagram: power stage Page 7: Circuit diagram: mains input Page 8: PCB silk screen, top view Page 9: Parts list...
  • Page 4 1.0 Externals This is a view of the external controls on the Circle5A. The function of the Master Volume control is to scale down excessive input signals. In a set-up where the signal level is scaled so that set to maximum (fully clockwide) an input of 0.775vdBv, on the loudest peaks, will fully drive the power amplifiers.
  • Page 5 Removing the Circle 5a active module from the cabinet It is absoluletely essential that before removing 1. A 3.0mm cross head screwdriver of the the module you have the necessary tools, a clear space, and sufficient uninterrupted time to work. Rushing leades to mistakes, and mis- tekes can be dangerous and impair the excel- lent performance of your Circle 5a speakers.
  • Page 6 2.0 General arrangement NOTE CAREFULLY: DO NOT CONNECT EITHER OF THE BASS All the signal processing circuitry of the OUTPUT TERMINALS TO GROUND SINCE Circle5A amplifier module is contained on one THIS WILL INSTANTANEOUSLY DESTROY double-sided plated-through PCB. There are no ONE OR BOTH BASS POWER IC’S.
  • Page 7 inside Photograph of the amp module viewed from the Version 1d: 01.99 Page 7...
  • Page 8 Mute-relay modification A modification involving improving the switch on/off threshold of the mute relay was introduced shortly after production commenced. This involves the changing of resistor R46, initially fitted as 100kR to 200k or 220kR. It is not practical or necessary to remove the PCB, and the fitted resistor can be cut out, and a substitute resistor carefully soldered in it’s place.
  • Page 9 Be sure to return the preset adjuster to the analysis equipment is available. original level or to make a note on the outside of the module that the Circle 5a is no longer As despatched, the tweeter control is normal- standard.
  • Page 10 Version 1d: 01.99 Page 10...
  • Page 11 Connections to the Circuit board Version 1d: 01.99 Page 11...
  • Page 12 Version 1d: 01.99 Page 8...
  • Page 13 Version 1d: 01.99 Page...
  • Page 14 Version 1d: 01.99 Page...
  • Page 15 Harbeth HHB Circle 5 Power 16 K 100 nF Folie amplifier parts list 1.1999 2,2 K 4,7 uF / 50V ELKO 10 K 4,7 uF / 50V ELKO Bez. Wert 100 nF Folie 27 K 100 nF Folie 27 K...
  • Page 16 Jumper Jumper Jumper LED green 2-pol. Berg-Stiftleiste 76384-302 Overload 2-pol. Berg-Stiftleiste 76384-302 4,8mm Flachstecker 4,8mm Flachstecker 4,8mm Flachstecker OUT2 4,8mm Flachstecker VCC1 4,8mm Flachstecker VCC2 4,8mm Flachstecker GRND4,8mm Flachstecker Mechanical parts Kühlblech 315 x 196 x 4 mm Cinchbuchse Monacor T-706G Kabelsatz Kaltgeräte, Poti;...