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Service Guide

SP-HF1255A

12

1.2.6 Headphone jack output no sound

Problem

Analyze

and identify

the causes

Solutions

Headphone jack no sound

N1 in 1255A AMP PCBA defective or its related copper

foil broken

Check and replace

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Summary of Contents for SP-HF1255A

Page 1: ...Service Guide SP HF1255A 1 SERVICE GUIDE KEY SYSTEM CORP ...

Page 2: ...Service Guide SP HF1255A 2 Revision History Version Date Change 1 0 2009 12 22 ...

Page 3: ... indicator unlighted 7 1 2 2 No sound 8 1 2 3 Right or left channel no sound 9 1 2 4 Noise 10 1 2 5 LED indicators no light 11 1 2 6 Headphone jack output no sound 12 1 2 7 VR headphone jack or line in jack abnormal 13 Chapter 2 Specification 14 Satellite 14 Chapter 3 Block diagram 15 Chapter 4 Part list 16 Chapter 5 Important notes 17 Chapter 6 Exploded view 18 Right Satellite 18 Left Satellite 1...

Page 4: ...nd stable surface Do not place the speakers in environments subject to mist smoke vibration excessive dust salty or greasy air or other corrosive gases and fumes Do not drop or jolt the speakers Do not allow anything to drop into the subwoofer case through its ventilator as it could result in fatal electric shock or fire Place the unit far enough from other equipments for good heat dissipation Do ...

Page 5: ...tomers FUNCTION NG FUNCTION NG FUNCTION OK FUNCTION OK Verifying problems proceeding necessary tests Analyzing possible Main function cause Deciding Proceeding the Rectification methods Replace Necessary defective parts Verifying problems Proceeding Necessary tests Return the speakers with proper repacking to customers ...

Page 6: ...em Item Problem Description 1 2 1 No power LED indicator no light 1 2 2 No sound 1 2 3 Right or left channel no sound 1 2 4 Noise 1 2 5 LED indicator no light 1 2 6 Headphone jack output no sound 1 2 7 VR headphone jack or line in jack abnormal ...

Page 7: ...given in individual Flow chat in that this is the best recommended sequence to rectify the problems Defective transformer Defective or damaged AC cable or power switch Or caused by the following 1 Transformer secondary wire loosely connected with 1CN1 jack in SP HF1255AAMPA 2 Copper foil of SP HF1255A AMP PCBA broken Repair or replace Re solder or replace No power LED indicator unlighted ...

Page 8: ... Solutions No Sound PCB short circuited dry soldered or broken CN1 and CN2 in AMP board is not properly connected Or caused by the following defective components 1 U1 U2 in AMP PCBA 2 VR1 N2 1CN4 in SP HF1255A AMP PCBA Repair or Replace Repair or Replace Repair re solder or Replace ...

Page 9: ...o sound PCB damaged dry soldered or short circuited CN1 in SP HF1255A and CN2 in SP HF1255A AMP PCBA are loosely connected Driver unit or speaker cable defective or loosely connected Audio cable defective or loosely connected VR N2 or 1CN4 defective in SP HF1255A AMP PCBA Repair or Replace Repair or Replace Re connect replace or repaire ...

Page 10: ...or diode dry soldered or damaged please check C1 C14 C31 C20 C9 1D1 1D2 1D3 1D4 in AMP defective or not The power supply of each IC is normal or not Or caused by vibration from too long lead wire of driver units Driver units damaged Woofer cabinet leaks closed not well Repair Check and replace Repair or replace ...

Page 11: ...ze and identify the causes Solutions LED indicator no light 1 PCB damaged dry soldered or short circuited 2 R3 in SP HF1255AAMP PCB defective 3 Poor connection of 1CN1 in SP HF1255A PCB and power switch in rear panel 4 Defective LED1 in SP HF1255AAMP PCB Check and replace ...

Page 12: ...ide SP HF1255A 12 1 2 6 Headphone jack output no sound Problem Analyze and identify the causes Solutions Headphone jack no sound N1 in 1255A AMP PCBA defective or its related copper foil broken Check and replace ...

Page 13: ...m Analyze and identify the causes Solutions VR headphone jack or line in jack abnormal VR Defective VR may cause VR3 in 1255A AMP PCB or VR1 VR2 in SP HF1255A AMP PCBA having scratching sound when rotatin Check and replace Jack N1 or 1CN4 in 1255A AMP PCBA defective Check and replace ...

Page 14: ... B 75 75 70 9 CHANNEL UNBALANCE REF O P POWER d B 0 3 0 5 1 10 CHANNEL SEPARATION ONE CHANNELIN OTHER CHANNEL INPUT SHORTING d B 51 51 40 11 HUM NOISE VOLUME MAX INPUT SHORTING m V 1 6 1 6 2 12 HUM NOISE VOLUME MIN INPUT SHORTING m V 0 3 0 4 1 Woofer No Description Unit Normal Limit 1 RATED OUTPUT POWER 100HZ 10 THD W 2 SENSITIVITY 100Hz RATED O P POWER m V 3 SENSITIVITY 100Hz 1W O P POWER m V 4 M...

Page 15: ...Service Guide SP HF1255A 15 Chapter 3 Block diagram AUX LINE IN T R E B A S V O L POWER 4588 FILTER HEADPHONE JACK STA540SA POWER AMP R SPEAKER L SPEAKER ...

Page 16: ...230V 50HZ 14V 2 5A 11 2 001 0090 woofer driver unit cloth cover SP HF1255A 11 6 005 0052 U1 STA540SA 11 1 170 0122 U2 4558 11 1 170 0056 AC cable 11 3 001 0035 VR1 VR2 16KG B50K L15 MID POSITIONING 11 1 030 0028 VR3 16KG B50K L15 11 1 030 0009 Left Description Part No Wooder driver unit cloth cpver 11 6 005 0052 driver unit woofer tweeter 21 8 040 0031 21 8 920 0008 Wooden cabinet SP HF1255A satel...

Page 17: ...sary to pack each PCB assembly with a separate static protecting bag in order to avoid static electricity Reliable external packing is also very important when sending the PCB assembly by post in that it would avoid unnecessarily lost or damage Short of spare parts while repairing a speaker system If you are short of spare parts when you have some speaker systems waiting to be repaired it would be...

Page 18: ...Service Guide SP HF1255A 18 Chapter 6 Exploded view Right ...

Page 19: ...Service Guide SP HF1255A 19 Chapter 6 Exploded view Left ...

Page 20: ...Service Guide SP HF1255A 20 Chapter 7 Schematic diagram ...

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