Can you help? Gps 3400 trips on channel A on startup, see video

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gummihermanns
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Posts: 2
Joined: Sun Mar 19, 2017 3:02 pm

Can you help? Gps 3400 trips on channel A on startup, see video

Post by gummihermanns » Sun Mar 19, 2017 3:35 pm

Hi, my first post here, I got my hands on gps 3400, when i powered it up, with no speaker or audio connected. it turns on, but after 8 sec yellow signal light on channel A fades in and channel resets and turns on again, and after 8 sec yellow back on, reset and so on...
When signal light fades in, a DC volt builds up to 3V before it resets og speaker A output.
I have measured every transistor on channel A heatsink, and on channel A part on the board, all ok no leak.
I ESR measured all big caps, all within range.
I replaces C102 47uF 50v becaus its capacitance was 40uF.

here is video of the power up https://youtu.be/lDA3R6ezuxM
any ideas???

gummihermanns
New Member
Posts: 2
Joined: Sun Mar 19, 2017 3:02 pm

Re: Can you help? Gps 3400 trips on channel A on startup, see video

Post by gummihermanns » Sun Mar 26, 2017 4:10 pm

solved, missing connection vol pot and connnection ribbon.

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