Pioneer Amp DC-Z92/Tuner F-Z92 problem
HI,
My Pioneer amp and tuner developed some intermittent problem which I do not know if it is the amp or the tuner. There is no sound from the speaker when the tuner is selected(may be a faint hiss if the vol is turned up to max.) and the vu display shows no signal at the input. Some times the problem disappear for a while and then the sound will be gone again. Any clue? or any one can point me to a schematic or even pin out and volage levels at the ribbon cable going from the tuner to the amp? Thanks. Cheuk |
Pioneer Amp DC-Z92/Tuner F-Z92 problem
Well, if you're referring to the signal strength meter, and it shows no
signal when the problem occurs, perhaps the antenna connection is loose or connected improperly. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Cheuk-Fai Wong" wrote in message ... HI, My Pioneer amp and tuner developed some intermittent problem which I do not know if it is the amp or the tuner. There is no sound from the speaker when the tuner is selected(may be a faint hiss if the vol is turned up to max.) and the vu display shows no signal at the input. Some times the problem disappear for a while and then the sound will be gone again. Any clue? or any one can point me to a schematic or even pin out and volage levels at the ribbon cable going from the tuner to the amp? Thanks. Cheuk |
Pioneer Amp DC-Z92/Tuner F-Z92 problem
Hi Mark,
I checked the Ant connections and they are fine(AM and FM terminals). The meters I am referring to are the VU meters. Cheuk "Mark D. Zacharias" wrote in message ... Well, if you're referring to the signal strength meter, and it shows no signal when the problem occurs, perhaps the antenna connection is loose or connected improperly. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Cheuk-Fai Wong" wrote in message ... HI, My Pioneer amp and tuner developed some intermittent problem which I do not know if it is the amp or the tuner. There is no sound from the speaker when the tuner is selected(may be a faint hiss if the vol is turned up to max.) and the vu display shows no signal at the input. Some times the problem disappear for a while and then the sound will be gone again. Any clue? or any one can point me to a schematic or even pin out and volage levels at the ribbon cable going from the tuner to the amp? Thanks. Cheuk |
Pioneer Amp DC-Z92/Tuner F-Z92 problem
In that case, there may be an intermittent fault in the tuner - bad solder
connections, for example. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Cheuk-Fai Wong" wrote in message .. . Hi Mark, I checked the Ant connections and they are fine(AM and FM terminals). The meters I am referring to are the VU meters. Cheuk "Mark D. Zacharias" wrote in message ... Well, if you're referring to the signal strength meter, and it shows no signal when the problem occurs, perhaps the antenna connection is loose or connected improperly. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Cheuk-Fai Wong" wrote in message ... HI, My Pioneer amp and tuner developed some intermittent problem which I do not know if it is the amp or the tuner. There is no sound from the speaker when the tuner is selected(may be a faint hiss if the vol is turned up to max.) and the vu display shows no signal at the input. Some times the problem disappear for a while and then the sound will be gone again. Any clue? or any one can point me to a schematic or even pin out and volage levels at the ribbon cable going from the tuner to the amp? Thanks. Cheuk |
Pioneer Amp DC-Z92/Tuner F-Z92 problem
Dear Mark,
After inspecting the IC's used and downloaded their pinout and data sheets, I proceed to chase the problem. When I look at the AM local osc I noticed a 100KHz higher/Lower(? I forgot) than expected when,say, I tuned to 1430KHz I should expect 1430+450Khz but I notice the 100Khz difference. I think that may be the problem. I could not measure the FM local osc because I do not know where to measure. The unit uses LM7001(Sanyo PLL AM/FM synthesiszer), LA1256 IF chip and AN7040 MPX chip. I do not have a local source to get the LM7001 chip to replace so there is no way to prove my theory. Thanks anyway. Cheuk |
All times are GMT +1. The time now is 12:13 PM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 DIYbanter