GRUNDIG CUC7303 Repair Tips
Search: CUC7303 GRUNDIG
Results 8
Results 8
| 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 | CUC7303 | Won't go fully into st/by - crt heaters stay lit etc | Pin 1 IC676 should drop to 1.2v in st/by - was staying at 10.7v. BC848 sm tr downstream from pin 1 was faulty though checked ok | ||
| Grundig | CUC7303 | St/by LED blinks (tripping) | D667 BA157 -use BA159 in lieu, UC3842 supply rect (measured ok) also check 0R82 res in emitter, 2 x 1N4004 & res 220R & sm LS4148 diodes & HT control for o/c + chopper Tr & IC | ||
| Grundig | CUC7303 | off burning smell | bad joints mains sw | ||
| Grundig | CUC7303 | Led blinks at 1 Hz rate,no start-up | Change D667 (BA 157) even if it reads ok!!. | ||
| Grundig | CUC7303 | Dead with mains fuse o/c | Degauss positor | ||
| Grundig | CUC7303 | Dead apart from LED flashing | Sw mode trnfmr o/c winding between pins 5 & 7 (was able to repair) | ||
| Grundig | CUC7303 | Dead - PSU blown | Chopper tfmr, S2055 LOPTr & FOP chip |