Grundig CUC73 Repair Tips
Search: CUC73 Grundig
Results 54
Results 54
| Make | Model Ch. | Symptom | Problem Solution | Solution | By: |
|---|---|---|---|---|---|
| Grundig | T55-731 CUC7303 / FET TYPE | Dead bridge and chopper transistor s/c | If no D663 fitted this is version 2 has fet and UC3843. Failure of p.s components caused by C669 dry jointed. Check/change FET BUZ90, D667 BA157, R661 4.7k not 220r version 1, R666 and R667 56r 1w, R663 10r and the UC3843. All values for 20" | ||
| Grundig | CUC7301/3 | Power supply blown | This is often caused by a dry joint at C669 in the snubber network but also check the mains bridge rectifiers reservoir capacitor 47uF, 385v for o/c, this item is not included in the ususal p.s.u repair kits and if not checked may result in a repeat blow up ! | ||
| Grundig | CUC7350 | Dead - mains fuse shattered | D60013/4 mains rects s/c, chopper FET T60020 IRFBC40 s/c used BUZ90 UC3843 replaced as prec,caused by dry joints chopper tfmr | ||
| Grundig | CUC7350 | Dead - +8v supply absent | R61021 15R safety res in 8v reg o/c | ||
| Grundig | CUC7301/3 | Mains fuse S1600 2.5A blows int | 1N4007 mains rect diode, also check IC630, T665chopper tr, zener D663, R661220R,Caps C661/663/656 & 667 | ||
| Grundig | CUC7301/3 | Dead after dry joint C669 caused havoc | T665 MJF18004C chopper s/c; IC630 µC3842N/AN; D621-4 1N4007; R661 220R; D663 3v6 zener; CD651 ZD18v; D667 BA157 leaky. | ||
| Grundig | CUC73xx series ST55-725 | Sound faulty | the soldered joints on C60029 were very poor | ||
| Grundig | CUC73xx series ST55-725 | Power supply blow up | Caused by C60029 470pF 1.6KV which was badly dry jointed. Only seems to affect sets fitted with blue cap - the orange ones are ok. | ||
| Grundig | CUC7350 | Width varies with pic content - HT varies between 119-129v | R60027 0R56 in curr sensing network - also check R60028 in parallel - values vary with screen size | ||
| Grundig | CUC7350 | Unstable HT | R60028 0R68 o/c - check it out of cct! | ||
| Grundig | CUC7350 | Tripping | R60027/28 0R46 gone hi res | ||
| Grundig | CUC7350 | St/by only | LM317T reg s/c by its heatsink clip | ||
| Grundig | CUC7350 | No sound | check sm trs to left of audio IC - mute sound in st/by & when told by micro - BC848C faulty in this case | ||
| Grundig | CUC7350 | No HT control | HT pot R60027 increased in value from 0R68 to 1R5 | ||
| Grundig | CUC7350 | mains fuse o/c, BUZ chopper tr s/c | dry joint C60029 470pf 1.6Kv also check D60011-14 & D60023/4 rects | ||
| Grundig | CUC7350 | Int start up | C60031 100µ 35v in psu | ||
| Grundig | CUC7350 | Dead IRFBC40 chopper MOSFET failure | Dry joints C60029 470pf. Check R60027/28 0R46, R60022 10R, D6011-14 D60023-24 1N4007 | ||
| Grundig | CUC7350 | Dead - Chopper FET & 2 rect diodes s/c | dry joint on C600 - blew again later due to arcing between FET & heatsink | ||
| Grundig | CUC7350 | Dead - 2.5A fuse blackened | T60020 IRFBC40 chopper tr s/c; D60013 1N4007 mains rect s/c; C60029 dry joints; R60023 1N4003 s/c; R60027 0R56 o/c | ||
| Grundig | CUC7350 | Dead | Chopper FET & control IC partial cure but all volts low until R60027/8 0R56 1w reistors replaced |