CAMBRIDGE CXA60 User Manual - page 18
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CAP5 - Five way protection system
Cambridge Audio has developed a proprietary protection system to ensure
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1. DC detection
Indication -
HUK4\[LSPNO[ÅHZOLZ[VNL[OLYPU[OLMVSSV^PUNZLX\LUJLVULÅHZO^P[OSVUN WH\ZLIL[^LLUÅHZOLZ9LHKILSV^MVYTVYLPUMVYTH[PVU Description - *(7VɈLYZSV\KZWLHRLYWYV[LJ[PVUPM[OLV\[W\[VM[OLHTWSPÄLY NVLZ[VHOPNOJVUZ[HU[]VS[HNL+*ILJH\ZLVMZVTLPU[LYUHSMH\S[;OPZPZH YHYLMH\S[HS[OV\NOKL[LJ[PUNP[JV\SKQ\Z[ZH]L[OVZLL_WLUZP]LSV\KZWLHRLYZ Remedy - Due to the necessary sensitivity of the DC protection circuit, L_[YLTLS` OHYK JSPWWPUN VM [OL HTWSPÄLY TH` JH\ZL +* WYV[LJ[PVU [V IL triggered. If this fault occurs, please contact your dealer for service. 2. Over temperature detection Indication - HUK4\[LSPNO[ÅHZOLZ[VNL[OLYPU[OLMVSSV^PUNZLX\LUJL[^VX\PJRÅHZOLZ ^P[OSVUNWH\ZLIL[^LLUÅHZOLZ9LHKILSV^MVYTVYLPUMVYTH[PVU Description - Over temperature is caused by a combination of high listening levels and low impedance speakers. CAP5 includes temperature detection which constantly monitors the heat generated by the output transistors. If the monitored temperature reaches a high level (suitably within the limits of the V\[W\[KL]PJLZ[OLHTWSPÄLY^PSSH\[VTH[PJHSS`Z^P[JOPU[VHMH\S[TVKL;OL unit should ideally be left for 15 minutes in this state to cool down adequately. If the unit has not fully cooled down then the temperature may reach the limit ZVVUHM[LY[OLHTWSPÄLYPZWV^LYLK\W0M[OLSV\KZWLHRLYPTWLKHUJLPZSV^ [OL [LTWLYH[\YL VM [OL HTWSPÄLY TH` YPZL MHZ[LY HZ [OL HTWSPÄLY PZ ^VYRPUN OHYKLY 0M [OL HTWSPÄLY PZ TV\U[LK PU H JHIPUL[ VY [OL ]LU[PSH[PVU ZSV[Z HYL obstructed the over temperature detection may activate/reactivate after a short listening time. Remedy - The internal temperature of the output transistors has reached the over temperature limit. Leave the unit for 15 minutes to cool down before WYLZZPUN[OL:[HUKI`I\[[VU[VYLZ\TLUVYTHSVWLYH[PVU 3. Overvoltage/overcurrent detection Indication - HUK4\[LSPNO[ÅHZOLZ[VNL[OLYPU[OLMVSSV^PUNZLX\LUJL[OYLLX\PJRÅHZOLZ ^P[OSVUNWH\ZLIL[^LLUÅHZOLZ9LHKILSV^MVYTVYLPUMVYTH[PVU Description - *(7 VɈLYZ =0 ]VS[HNLJ\YYLU[ WYV[LJ[PVU I` JVUZ[HU[S` TVUP[VYPUN [OL V\[W\[ [YHUZPZ[VYZ [V RLLW [OLT ^VYRPUN PUZPKL [OLPY :HML 6WLYH[PUN(YLH:6(;OL:6(PZHZL[VMSPTP[ZNP]LUI`[OLV\[W\[[YHUZPZ[VY manufacturer to ensure reliability. The V/I protection has been incorporated ^P[OPU[OLHTWSPÄLYJPYJ\P[Y`[VWYV]PKLHMHZ[YLZWVUZL[V[LTWVYHY`V]LYSVHK conditions. When the V/I protection is triggered the unit will continue to operate but distortion may be heard as the unit protects the output transistors. Remedy - Reduce the volume. If distortion is still present, check the speaker connections and ratings. 4. Short circuit detection Indication - HUK4\[LSPNO[ÅHZOLZ[VNL[OLYPU[OLMVSSV^PUNZLX\LUJLMV\YX\PJRÅHZOLZ ^P[OSVUNWH\ZLIL[^LLUÅHZOLZ9LHKILSV^MVYTVYLPUMVYTH[PVU Description - +\YPUN WV^LY \W MYVT :[HUKI` *(7 WLYMVYTZ H JOLJR VU the loudspeaker terminals to see if a short across the terminals has been accidentally introduced. If the resistance measured across the loudspeaker [LYTPUHSZPZ[VVSV^[OL\UP[^PSSZ[H`PU:[HUKI`TVKL\U[PS[OLMH\S[OHZILLU removed and Power up is re-attempted. Remedy - There may be a short circuit between the loudspeaker terminals. Check all loudspeaker connections before attempting to switch the unit out VM:[HUKI` 5. Intelligent clipping detection Indication - Volume is reduced automatically. Description - *(7OHZ[OLHIPSP[`[VKL[LJ[^OLU[OLHTWSPÄLYZ[HY[Z[VJSPW or overdrive at its output, which can damage loudspeakers, and degrade the sound. Clipping distortion is caused at high volume levels when the output ZPNUHS H[[LTW[Z [V NV V\[ZPKL [OL TH_PT\T ]VS[HNL [OH[ [OL HTWSPÄLY JHU WYV]PKLJH\ZPUN[OL[VWZVM[OLZPNUHS[VÅH[[LUVɈ When CAP5 detects clipping the volume will be automatically reduced down until CAP5 detects an undistorted output. Note: The clipping detection is disabled by default. The clipping detection can ILLUHISLKPU[OL:L[\WTLU\ZLLº:L[\WTLU\»ZLJ[PVU Troubleshooting There is no power Ensure the AC power cord is connected securely. Ensure the plug is fully inserted into the wall socket and is switched on. Check fuse in the mains plug or adaptor. There is no sound 4HRLZ\YL[OL\UP[PZUV[PU:[HUKI`TVKL Check that source component is properly connected. Check that your speakers are properly connected. Make sure the selected speaker A/B light corresponds to the speaker terminals that the loudspeakers are connected to. Make sure unit is not in mute mode. There is no sound on one channel Ensure that balance control is in the correct position. Check speaker connections. Check interconnects. There is a loud buzz or hum Check turntable or tone arm for ground and connection lead fault. Ensure no interconnects are loose or defective. ,UZ\YL[OH[`V\Y[\YU[HISLPZUV[[VVJSVZL[V[OLHTWSPÄLY 7KHUHLVZHDNEDVVRUGLσXVHGVWHUHRLPDJLQJ Ensure that speakers are not wired out of phase. 'LUHFW6SHDNHU$%DQG0XWHOLJKWñDVKLQJ :LLZLJ[PVUVU*(7WYV[LJ[PVUZ`Z[LT The remote handset will not function Check that the batteries have not expired. Ensure that nothing is blocking the remote sensor. -VYTVYLMYLX\LU[S`HZRLKX\LZ[PVUZ-(8»Z[LJOUPJHSHK]PJLHUKPUMVYTH[PVU VU NL[[PUN [OL TVZ[ V\[ VM `V\Y *?( WSLHZL ]PZP[ [OL :\WWVY[ ZLJ[PVU VU Cambridge Audio’s website: www.cambridgeaudio.com/support For all servicing, in or out of warranty, please contact your dealer.