| Make | Model | Problem | Solution | Date |
| | | |
| Found: 61
|
| B & O | 4000 | Frame - int. | 5TR12 , 5C34 | 14-09-04 |
| B & O | 4000 | HT Fluctuates | Check 6R29 , 6R30 ( 56k ) For High Resistance Also 6C20 , 6R27 | 14-09-04 |
|
|
| B & O | 4000 | HT Fluctuates | 6D19 ( 39v Zener ) Leaky. | 14-09-04 |
| B & O | 4000 | Intermitant Field Scan | Check 5TR12 Base-Emitter & 5C34 ( 2000u f ) For o/c | 14-09-04 |
| B & O | MX4000 | Dead - PSU comps destroyed | Tr1 BUT12AF, Tr12 BD435 s/c, R38 0R47 o/c - C12 dry joints (hard to see) | 14-09-04 |
| Fidelity | ZX4000 | Blank raster with flyback lines. | IC3 ( TDA3330 ) | 14-09-04 |
| Fidelity | ZX4000 | Caption buzz with very low sound | Adj I/c sound coil L5 to elliminate buzz, adj L4 vid det & L7 sound trap to elliminate patt | 14-09-04 |
| Fidelity | ZX4000 | Channels - stuck on channel 1. | IC ML923 selector IC , C221 ( 0.01uf ) leaky. | 14-09-04 |
| Fidelity | ZX4000 | dead | R110 2R2 o/c, BU508A s/c, due to R119 150k o/c also change R118 120k | 14-09-04 |
| Fidelity | ZX4000 | dead | HT at chopper - R120 330K o/c, C97 1µ leaky; D24 HT rect BY299 s/c | 14-09-04 |
| Fidelity | ZX4000 | dead | 1.6A fuse o/c; BU508 chopper tr s/c; R309 150k o/c; also replaced R311 120k | 14-09-04 |
| Fidelity | ZX4000 | Dead - fuse F1 blown. | C81 ( 150u f 385v ) s/c. | 14-09-04 |
| Fidelity | ZX4000 | dead - tripping | C122 10n dry joint & arcing. Blew BU508D lop tr | 14-09-04 |
| Fidelity | ZX4000 | DEAD PIN 9 TDA4600 PULSING | SHORT ON CHOPPER TX SECONDARY USUALLY D21 | 14-09-04 |
| Fidelity | ZX4000 | Dead. | R98 o/c. | 14-09-04 |
| Fidelity | ZX4000 | Dead. | D21 ( BY299 ) s/c. | 14-09-04 |
| Fidelity | ZX4000 | Dead. | R84 ( 15k ) o/c , C87 ( 47uf or 100uf 250v ) low. | 14-09-04 |
| Fidelity | ZX4000 | Dead. | D21 ( BY299 ) s/c. | 14-09-04 |
| Fidelity | ZX4000 | Distorted sound. | Speaker. | 14-09-04 |
| Fidelity | ZX4000 | Excess Green | TDA3330 | 14-09-04 |
| Fidelity | ZX4000 | Excess red pic | Judicious adj of A1 control cured it | 14-09-04 |
| Fidelity | ZX4000 | Frame - cogging. | C101 ( 100uf , 250v ) o/c. | 14-09-04 |
|
|
| Fidelity | ZX4000 | Frame - verticals corrugated. | C87 ( 100u f , 250v ) | 14-09-04 |
| Fidelity | ZX4000 | Hard to tune in stations. | Slightly adjust L4 ( video detector coil ) | 14-09-04 |
| Fidelity | ZX4000 | Int fails to come on. | R84 ( 15k 5w ) high , Drys on TR2 ( BU508A ) | 14-09-04 |
| Fidelity | ZX4000 | Int loss of picture - sound mutes. | C31 ( 2.7nf ) | 14-09-04 |
| Fidelity | ZX4000 | Int relay trips releasing mains switch. | C87 ( 100u f 250v ) | 14-09-04 |
| Fidelity | ZX4000 | int tuning/no sigs esp low freqs | Tuning volts wont fall below 5.4v; R157 2M2 o/c | 14-09-04 |
| Fidelity | ZX4000 | Intermittent picture. | DJ on brightness control. | 14-09-04 |
| Fidelity | ZX4000 | Lack of height. | PR17 ( 220R ) high. | 14-09-04 |