1 Safety Instructions 1.1 Due to high voltage internal, please be careful during troubleshooting and maintenance course. Please read the user manual and this maintenance manual first. 1.2 Due to the wrong operation in checking and repairing course will results to ruined damage on some parts, so please operate follow this manual. 1.3 The maintenance person must be ONLY a qualified professional personnel authorized by PROEL. 1.4 Don’t replace the key devices and adjust the adjustable potentiometers by yourself, it will change the parameter of the equipment. 1.5 Please cut off the power to guarantee the safety of the service person when repairing. 1.6 The devices marked in the drawing indicates a key device, please replace it ONLY with a spare part specified by PROEL. ...
5 Malfunction Analysis on SMPS (Power Supply) 5.1 Circuit Diagram of Aux Power Supply Module: 5.2 Malfunction Analysis on Aux Power Supply Module: Sequence Circuit to Most Probably Failures No. check STY LED is off; the equipment is unavailable to start. ‐ Check the circuit, see if the CN1 pin and the copper foil of Aux Power Supply is broken; When amplifier connects to power supply, the Aux Aux Power Power Supply (self‐activated switch) will start to work, it provides two 1 Supply group standby power supply +5V & +16V. Among them, CN3/+5V is for Board power on/off led (orange), CN1/12 foot/+16V is for the main power control board, the main power on/off is controlled by the CN4/(1)(3) in plug. When the CN4/(1)(3) is closed, OP3/817 will be connected, Q2/8050 will be downed to low level (VPI). Repairing Guide: When repairing the power board, please cut the DC/300V fuse, series connect a 100W—200W lamp to start the machine, preventing the damage of related device when repairing. ...
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5.3 Circuit Diagram of SMPS Control Module: 5.4 Malfunction Analysis on SMPS Control Module: Sequence Circuit Failure No. Function ‐ The equipment is unavailable to start; ‐ Protection function will be activated when in low impedance output; 1 SMPS Control ‐ Cyclic protection of the switch power; ‐ Delay start, over‐voltage PROT, low‐voltage PROT and over current PROT. Repairing Guide: 1) When repairing the control board, you can cut every protect circuit gradually found the defective area! ...
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5.5 Circuit Diagram of EMC Module: 5.6 Malfunction Analysis on EMC Module: Sequence Circuit Failure No. Function ‐ Restriction on EMI and RFI The equipment is unavailable to 1 Line Filter start‐up, the AC fuse of the rear panel is burnt when connected the electricity check the RT1 component and see if there is short circuit. 5.7 Circuit Diagram of Low Voltage control circuit: ...
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5.8 Malfunction Analysis on Low Voltage control circuit: Sequence Circuit Failure No. Function ‐ The equipment cannot be started: LM2596 zener will output ‐ one group +24V, provided power supply for the relay, fans and LED on front panel. Amplifier protection: ±15V power supply is Low‐voltage 1 abnormal. Fans are stopped, quick or slow working. Soft‐start Control resistor is burnt on power supply. ‐ Connecting the jumper of 110V and ACI port, the double voltage rectifier will let the circuit work with 110V and 120V mains voltage. Repairing Guide: Equipment cannot be started, but the LED on control board is normal. Please check if the +24V power supply of CN6 connector is normal or not. ...
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fuse; ‐ K1/85°c thermal switch is often closed result to the start‐up unavailable; ‐ High‐current while start‐up the equipment, cause the burnt out of the primary side F1/DC/300V fuse; ‐ Switching transistors do not work, check the driving transformer T2 LLC resonant 2 (driving waveform please refer to the figure 1), the primary current converter of HF transformer formed a loop through the primary side current T3A, resonant inductance L5 and resonant capacitor 16 (LLC resonant converter ZCS Waveform please refer to figure 2); ‐ Check the primary side current by LF1 current transformer, abnormal of the related components will results protection; ...
6 Malfunction Analysis on Input Module 6.1 Circuit Diagram of Input Module: 6.2 Malfunction Analysis on Input Module: Sequence Circuit Function Failure No. ‐ Poor connection of two‐way switch SW2 (4‐3) or not located at the Stereo / Parallel right position will cause parallel or bridge indicator does not shine, 1 / Bridge Switch that can not function on and off. Circuit ‐ Parallel indicator does not shine, poor connection of D10, R56, Q9; ‐ Bridge indicator does not shine, poor contact of D9, R52, Q6, Q7; Photoelectric ‐ Linear optical coupler L3 or L5 is damaged, no sound in CH1 or CH2; 2 Volume ‐ Linear optical coupler L2 or L6 is damaged, sound leaking in CH1 or Control Circuit CH2; ‐ Poor contact of two‐way switch SW2 (2‐1) or not located at the right Soft Clip 3 position will cause no soft clip in CH1 or CH2; Circuit ‐ Abnormal of soft clip circuit formed by Q1, Q2, Q3, Q4 will cause ...
distortion of waveform. ‐ Poor contact of two‐way switch SW2 (4‐3) or not located at the right Sensitivity position will cause abnormal of CH1’s sensitivity; 4 Switch Circuit ‐ Poor contact of two‐way switch SW2 (2‐1) or not located at the right position will cause abnormal of CH2’s sensitivity. ‐ Damage of L1, L4 linear optical coupler will cause no clip limit in CH1 Clip Limit or CH2; 5 Circuit ‐ There is big signal output even if the amplifier already over‐heat protection‐VR1/VR2 are not in the best resistance value; ±15V Power ‐ +15 V or‐15V power supply imbalance will cause serious distortion of 6 Supply the voice, and power amplifier protection etc.; Repair Guidelines: 1) There is still large signal output when in protection circuit, increase the volume and the signal source and then detect the output waveform by opening oscilloscope or multimeter, adjust the output ...
7.1 Malfunction on Display Module: Sequence Circuit Failure No. Function ‐ CN4 socket off, no +24 V power supply will cause start‐up Display unavailable; /Volume 1 ‐ Poor contact of CN1/CN2 socket will cause the fan fast rotating Control and indicator off in front panel; Board ‐ No +5 V power supply of U1/78L05 will cause no sound; Repairing Guide: Cannot start‐up the equipment, but the indicator on the power control board is normal. Check whether the CN4 socket of +24V power supply is normal or not? 8 Malfunction Analysis on Pre‐Amplifier Module 8.1 Circuit Diagram of Pre‐amp Module: ...
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8.2 Malfunction Analysis on Pre‐amp Module: Sequence Circuit Function Failure No. ‐ The damage of IC1/5532 will results to DC output protection of the amplifier. ‐ Abnormal of ±15V power supply will cause bias difference or Class AB amplifier protection. 1 Power ‐ The damage of Q1, Q2 voltage amplification transistor will cause Output high current. ‐ Amplifier self‐excitation: check whether the device of C6/220P was turned bad. ‐ Amplifier output short‐circuit and no protection; Short‐circuit ‐ Start‐up protection; 2 Protection ‐ The amplifier will start protection in soft clip status if the component D15, U2/817 damaged. ‐ No clip limit, check if the U1/817 is damaged. ‐ Limit delay. Check the D12, R30. Clip Limit 3 ‐ Waveform jitter when in clip limit, check whether the Q5, Q6, Q7, Circuit ...
9 Malfunction Analysis on Protection Module 9.1 Circuit Diagram of Protection Module: 9.2 Malfunction Analysis on Protection Module: Sequence Circuit Function Failure No. Indicator ‐ Indicator driving circuit includes: signal indicator, clipping indicator, 1 Driving Circuit TEMP indicator, PROT indicator and high‐frequency indicator; VHF/Over‐heat ‐ The delay circuit is a collection of VHF, short circuit, over‐heat, 2 Protection and DC‐protection, as well as start‐up delay. When the protection function Delay Circuit and start‐up delay are abnormal please check this circuit. ‐ No output ‐ relay does not pull‐in. First check whether it is normal for 24V power supply, Q5 and Q6 is connected or not. ...
10.2 Malfunction Analysis on Power Output Stage Module: Sequence Circuit Function Failure No. ‐ Damage of components C1, C2 will results module loading self‐excitation. ‐ Class AB Voltage between components Q3‐Q6 and Q8‐Q11BE will be down to 1 Power Output 0.3‐0.43; If the voltage is high, it will result in static current raised and the burnt out of power transistors. If it is low, it will cause cross‐over distortion. ‐ Low output/ early Clipping: Positive or negative power supply should not be opened, without second step power supply. 3H Logic ‐ The resistance of amplified module is heating abnormally, positive / 2 Power Switch negative power transistor (Q19, Q22) is connecting or short circuit for Circuit long time; ‐ The abnormal of high‐speed switching comparator / LM311 would results to second step power supply could not use and low output. ...
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