Pace 4001 NC can't access engineering menu / stuck in tune / nit

[nexatron]

Hi

I've been trying to fix a friend's Pace 4001 stb using Dalmation's very informative tut. I've fixed a few of these before and am aware that stuck in tune is a common issue; however, this bugger has got me puzzled as after pulling the red jumper I can't even access the engineering menu to set the default frequency. On pwering up with the feed in it'll go through 'PACE' for a longer than normal duration, and then cycle 'tune' and 'nit' indefinately with the 'stanby', 'remote' and 'messages' leds flashing consequetivley.

I've replaced the CIM with a known good one to no avail, removed the 33V caps and checked the voltages which all appeared normal with the exception of the TUN100 33V line which strangely seemed to be cycling regularly in a descent from ~30V to 2V - is this normal???

I also changed the 7 electrolytic caps near the tuners for good measure but no luck here either. I tried communicating with it via Libby, it stuck on 'PACE' and the only response I got was (a)AT(a). I could spend another day arsing with this, but me thinks it could be due for the salvage yard, as I can't even access the engineering menu. However, if anyone has any other ideas about this they would be greatly appreciated. Cheerz

[abbs2002]

Originally Posted by nexatron

Hi

I've been trying to fix a friend's Pace 4001 stb using Dalmation's very informative tut. I've fixed a few of these before and am aware that stuck in tune is a common issue; however, this bugger has got me puzzled as after pulling the red jumper I can't even access the engineering menu to set the default frequency. On pwering up with the feed in it'll go through 'PACE' for a longer than normal duration, and then cycle 'tune' and 'nit' indefinately with the 'stanby', 'remote' and 'messages' leds flashing consequetivley.

I've replaced the CIM with a known good one to no avail, removed the 33V caps and checked the voltages which all appeared normal with the exception of the TUN100 33V line which strangely seemed to be cycling regularly in a descent from ~30V to 2V - is this normal???

I also changed the 7 electrolytic caps near the tuners for good measure but no luck here either. I tried communicating with it via Libby, it stuck on 'PACE' and the only response I got was (a)AT(a). I could spend another day arsing with this, but me thinks it could be due for the salvage yard, as I can't even access the engineering menu. However, if anyone has any other ideas about this they would be greatly appreciated. Cheerz

try to boot into EM with out feed attached.

[nexatron]

Tried this but alas, no luck. The only difference it made was that the display went from 'PACE' to 'tune' and remained on 'tune'. Grrr.

[clarkyj]

had this problem wit 2 of these and i de soldered the chip in it and put it back again , there were a few dry joints worked a treat

[nexatron]

Originally Posted by clarkyj

had this problem wit 2 of these and i de soldered the chip in it and put it back again , there were a few dry joints worked a treat

Do you mean the two atmels near the SIM? Cheerz

[P3T3]

I had the same poroblem, have you tryed holding standby when booting, then 2321, then hold up and down as you would when booting normaly in to eg menue. I hope this helped!!