You may have to start checking the sound circuit to find out what's wrong.
Can't find a service manual for a P-45 but here's one for a [document|40056|P-45B] which may help. Hopefully there's not too much of a difference.
Looking at the block diagram on p.100 (of 109), the headphones and the speakers use different circuits i.e. the headphones use a DAC (digital analogue converter) and the speakers use a digital amplifier and the only common point for the sound, is their inputs (or output from the CPU if you prefer). Put simply when a piano key (or keys) is pressed a signal is sent to the CPU which knows what tone to send to either the speakers or the headphones
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Perhaps start by checking if cable between the PN board and the DM board securely connected at both ends. Also that the power rails have the correct voltages e.g. +12V, +3.3V etc.
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Perhaps start by checking if the cable between the PN board and the DM board is securely connected at both ends. Also that the power rails have the correct voltages e.g. +12V, +3.3V etc.
If the above checks seem OK I think that it will need circuit testing with a DMM (digital multimeter) at board level to find out what's wrong
Hi @janebryan
You may have to start checking the sound circuit to find out what's wrong.
Can't find a service manual for a P-45 but here's one for a [document|40056|P-45B] which may help. Hopefully there's not too much of a difference.
Looking at the block diagram on p.100 (of 109), the headphones and the speakers use different circuits i.e. the headphones use a DAC (digital analogue converter) and the speakers use a digital amplifier and the only common point for the sound, is their inputs (or output from the CPU if you prefer). Put simply when a piano key (or keys) is pressed a signal is sent to the CPU which knows what tone to send to either the speakers or the headphones
Perhaps start by checking if cable between the PN board and the DM board securely connected at both ends. Also that the power rails have the correct voltages e.g. +12V, +3.3V etc.
If the above checks seem OK I think that it will need circuit testing with a DMM (digital multimeter) at board level to find out what's wrong