Qsc K12.2 · powered speaker
181 components · 41 parts identified · 6 photos. Tap a marked part to see what it is.
13 traced nets on this board are available to technicians. See plans
| Designator | Part (number or value) | Marking | Description | Package |
|---|---|---|---|---|
| C4, C101, C148 | 0.1uf 25v 0603 | |||
| C34 | 22uf 25v 1206 | cap | ||
| C47 | - | ucc2893 lineuv cap | ||
| C52 | 220pf 250vac radial dipped y1 | |||
| C53 | 120pf 200v 0805 | |||
| C56 | 1000uf 25v radial | across +12vlow 1000uf 25v | ||
| C56 | 1000uf 25v radial 10x20 | +12vlow | ||
| C70 | 10uf 25v 1206 | ucc2893 vdd cap | ||
| C81 | 47uf 100v radial | |||
| C91 | 1000uf 25v radial 10x20 | 15v | ||
| C92 | 1000uf 25v radial 10x20 | -15v | ||
| C94 | 1000uf 25v radial 10x20 | post d62 15v, on u7 l78m05 input. | ||
| C95, C125 | - | c95 and c125 in parallel 1uf | ||
| C101 | 0.1uf 25v 0603 | across ldo in | ||
| C115 | - | ucc2893 soft start cap | ||
| C116 | - | clamp capacitor | ||
| C124 | 0.0022uf 250vac radial dipped y1 | |||
| C145 | 1000uf 25v radial | aux power psu_bias filter cap 1000uf 25v | radial | |
| C145 | 1000uf 25v radial | regulated vaux psu_bias | ||
| C145 | 1000uf 25v radial 10x20 | aux power psu_bias | ||
| C148 | 0.1uf 25v 0603 | across ldo out | ||
| D15, D19, D20, D36, D43 | SMD110PL | |||
| D19 | SMD110PL | aux power series schottky diode from aux ldo to aux power filter cap | sod123fl | |
| D23 | - | zener diode across ucc2893 aux out | ||
| D23 | L3NY | across aux out | ||
| D24 | L3NY | across main out | ||
| D24 | MBR230 | zener diode across ucc2893 main out | ||
| D27 | 1N4148 | sod523 | ||
| D27 | 1N4148 | main fet gate discharge diode in parallel with two 10 ohm resistors r157 and r121 | sod523 | |
| D29 | SMD110PL | +12Low rectifier schottky diode | sod123fl | |
| D35 | RB751S40T1 | |||
| D37 | SMD110PL | +12Low return rectifier schottky diode 100v 1a | sod123fl | |
| D40 | RB751S40T1 | clamp mosfet gate drive diode | ||
| D43 | SMD110PL | schottky aux rectifier diode 100v 1a | sod123fl | |
| D62 | MBR230 | |||
| F1 | - | smd fuse on -15v winding 24v 5a | 1206 | |
| F2 | - | smd fuse on +15v winding 24v 5a | 1206 | |
| J4 | - | pinout: gnd +5 -15 +15 vac gnd temp rly sd-l gnd hf lf gnd | ||
| K2 | - | voltge doubler relay | ||
| K2 | ALQ124 | |||
| L1 | - | woofer out | ||
| L2 | - | tweeter out | ||
| Q2, Q3, Q7, Q8 | IRFB4020 | |||
| Q3, Q8 | - | low side | ||
| Q4 | M7 PIMD3 115 | doubler relay control | tssop6 | |
| Q7 | - | high side | q2 | |
| Q11 | - | ac detect driver | ||
| Q12 | - | ac detect lineuv bjt | ||
| Q13 | STP11NM60FD | clamp mosfet | ||
| Q13 | STP11NM60FD | |||
| Q14 | STP45N65M5 | main mosfet | ||
| Q14 | STP45N65M5 | |||
| Q15 | MMBTA42 | 1d | sot23 | |
| Q16 | IRLML2502 | audio drivers vcc +12vlow regulator mosfet. | sot23 | |
| Q18 | MMBTA56 | clamp mosfet gate discharge pnp | ||
| Q18 | MMBTA56 | pnp | sot23 | |
| Q20 | FMB3946 | amp shutdown npn pnp dual bjt | tssop6 | |
| Q23 | 002A | dual npn pnp bjt | tssop6 | |
| Q25 | R1GK5 | switch to disable active clamp at light loads | ||
| R52 | - | not used | ||
| R89 | - | ucc2893 vdd current limiting resistor. Series resistor helps prevent scr latch up. 2r87 | ||
| R121, R157 | 10 ohm 0402 | 10 | ||
| R121, R157 | 10 ohm 0402 | |||
| R131 | - | between pri-lo and lineuv | ||
| R150 | 10k ohm 1206 | 10k | ||
| R150 | 10k ohm 1206 | |||
| R187 | 243 ohm 0805 | |||
| T1 | - | current sense transformer | ||
| T1 | - | transformer | ||
| T3 | - | clamp mosfet drive transformer | ||
| T3 | PPMGD-59 | |||
| U1, U2 | IRS2092S | audio driver | ||
| U2 | IRS2092S | |||
| U3 | - | feedback opto | ||
| U4 | 79L05A | audio drivers vss -5v ldo | sop8 | |
| U4 | LM79L05 | sop8 | ||
| U6 | ZR431 | marking: 43b. tentative voltage detector AAT60043B-S2 | sot23 | |
| U7 | 78m05 | |||
| U7 | 78m05 | audio drivers vaa 5v ldo | dpak | |
| U8 | AXGC | 5pin temperature sensor | ||
| U9 | MC33078 | ac voltage monitoring | ||
| U10 | - | opto to disable active clamp at light loads | ||
| U15 | UCC2893PW | conditions for oscillation are lineuv > 1.27v, fb > 1.25v, vref > 4.5v, cs < 0.75v. The startup device is a depletion mode jfet. | tssop16 | |
| U16 | LM78L12ACM | regulates the bootstrap power supply for the pwm controller. Output goes to c145 through d19. | soic8 | |
| U16 | LM78L12ACM | |||
| - | primary +vcc cap | |||
| - | primary -vcc cap | |||
| - | secondary vss cap | |||
| - | secondary vdd cap | |||
| - | resistor between vref and fb | |||
| - | ac detect rectifier | |||
| - | bridge rectifier | |||
| - | ac in connector | |||
| - | vin potential divider 6-resistor string 10k | |||
| - | bootstrap aux winding | |||
| - | vin | |||
| - | doubler relay pins | |||
| - | bootstrap aux winding. Goes through d43 to ldo u16 input. | |||
| - | +12vlow | |||
| - | -15v | |||
| - | 15v | |||
| - | 15v post diode, on u7 in | |||
| - | voltage doubler relay | |||
| - | primary caps | |||
| - | secondary caps | |||
| - | coil | |||
| - | tweeter output | |||
| - | woofer output | |||
| - | rectifier | |||
| 1000uf 25v radial | -15v | |||
| 1000uf 25v radial | 15v | |||
| 1000uf 25v radial | ||||
| 22uf 25v 1206 | ||||
| 47uf 100v radial 10x16 | ||||
| GENERIC CERAMIC CAPACITOR | ||||
| GENERIC SWITCHING POWER TRANSFORMER | main transformer |
Marked, not identified yet: C1, C17, C42, C80, C89, C116, C123, C128, C137, C149, D8, D9, D17, D18, D33, D34, D40, D48, D51, LD1, Q2, Q3, Q7, Q8, Q14, R67, R106, R164, T1, VR1, VR2