| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | TFM7720W | DEFECTIVE OSCILLATOR | No FM. All voltages looked good. All transistor wereconducting. Osc. was not working. | ||
| Sony | PSX45 | REVOLUTION NOISE | This unit produced a HEARTBEAT sound (one per revolution ofthe platter) which increased in intensity as the tonearm moved toward thecenter. This noise was being magnetically induced in the cartridgewindings. Scoping the motor drives revealed spikes on | ||
| Sony | ICR4800 | NO AM RECEPTION | No AM. | ||
| Sony | ICF2001 | COULD NOT RECEIVE AM STATIONS | Pins 2, 11, 12 and 13 of IC201 were inconsistently outputtingdata. Latch IC205 was not able to switch antennas to receive AM stations. | ||
| Sony | KP5040 | POOR BLUE RESOLUTION, REPLACED BLUE CRT | This unit had poor blue resolution and some bleeding. | ||
| Sony | KP5000 | COLOR DISTORTION | This unit would change the width of the green raster by twoinches when going from min to max brightness. The unit would alsoconverge OK on internal generator and then when it went back to video, theunit would be misconverged but would still check OK on | ||
| Sony | KX2501 | DEAD, REPLACED Q651 AND Q653 | Unit came in with Q652 shorted and seven amp fuse blown.Found that excessive current drawn beyond 65V AC when variable inputtransformer turned up. This was with B+ unloaded from power circuit.Individual measurement of power supply components showed both | ||
| Sony | KX2501 | LINES ACROSS SCREEN TOP AND BOTTOM, NORMAL (SUPPORT WIRE) | When viewing monitor with no video there are faint whitevertical lines across the screen. This appears to be horiz. pulsespossibly from the scan derived B+ voltages. Customer noticed these whilerecording with camera and became very critical. He insist | ||
| Sony | KV8000 | SHUT DOWN | Set works fine for an hour or so then goes dead. Will comeback on and repeat. | ||
| Sony | KV2650R | NO OPERATION, REPLACED D021 | Unit cannot be turned off except by master switch, no functionon any mode, i.e. power on/off volume up/down, channel up/down, pictureup/down etc. Voltage on Pin 2 on IC001 was high (4.8V). Found D021leaky (500K). | ||
| Sony | KV2648R | SNOW PICTURE, R557 CHANGED VALUE | The picture exhibited light snow on all channels all thetime the unit was on. After 5 to 10 minute warm up the picture shrankabout 2 inches vertically. | ||
| Sony | KV2648R | NO TUNING OPERATION, REPLACE PRESCALER | This set would not tune in any channel when the tune-upbutton was pressed. The tune-down button would work fine. All channelwere tuned in. | ||
| Sony | KV2648R | NO PICTURE, REPLACED Q602 AND Q603 | It first appeared as if Q602 shorted and that replacementwould solve the problem. However after about one hour it would shortout again. Q603 was discovered to have E-B leakage. | ||
| Sony | KV2647R | NO OPERATION, REPLACE IC-502 | Set would not come on, no sound or picture. Found IC501loading down Vcc on chip to 2VDC, should be 12.5VDC. | ||
| Sony | KV2647R | INCORRECT TUNING, RESOLDER R-085 | When unit turned on, it would come on with different channel. |