Panasonic SA-AKX16 CD STEREO SYSTEM (DEAD)

[AlbertRoss]

Hi I have Panasonic Hi-Fi system that will not power up? It was working fine one day, went to turn it on the next day, nothing happened?
Checked the obvious - mains cable and internal F1 fuse, all ok.
Have replaced the following electrolytic capacitors:
C6 22uf 50V, C9 47uf 50V, C10 47uf 16V, C11 470uf 10V, C12 470uf 10V and C26 680uf 50V. C11 and C12 (470uf 10V) had very high uF values which I presumed was the main problem?
C1 and C2 both 330uF 250V check out ok using Atlas ESR meter.
I have the following DC voltages at CONN 2: (disconnected)
1. +33.7V
2. +33.7V
3. PGND 00.00V
4. PGND 00.00V
5. NC 00.00V
6. + 3.25V
7. PROT 00.00V
8. SM-D 00.00V
9. AM-BP 00.00V
10. TEMP 00.00V
11. SYNC 00.00V
12. POWER 00.00V
13. ECO 00.00V

I don't have any schematics for this unit, also, should I have any voltage at PIN 12 or would this be maybe power in from main board?

Any ideas appreciated?

Thanks, Albert.

[stj]

Re: Panasonic SA-AKX16 CD STEREO SYSTEM (DEAD)

service manual

[R_J]

Re: Panasonic SA-AKX16 CD STEREO SYSTEM (DEAD)

It looks like the power supply is working ok and not the problem.
Pin 12 is the power on signal from the microprocessor, The fact you have +3.25 (+3.3v) on pin 6 is good, that SYS3.3V feeds the micro, eeprom etc. Check that you have 3.3 getting to ic2006, check the reset circuit Q2001.

[AlbertRoss]

Re: Panasonic SA-AKX16 CD STEREO SYSTEM (DEAD)

Hi,
Thanks for the schematics and information.

I have checked the following pins for voltage at IC2006:

Pin 17 - 3.28V
Pin 18 - 1.81V
Pin 37 - 1.81V
Pin 89 - 3.28V
Pin 100 - 3.28V

Pin 8 @ IC2007 EEPROM - 3.28V

3.27V @ Q2001 RESET.

Thanks,
Albert.