Got an old kenwood cassett deck .
Unit will not power up fuse is good .
Wondering if the IC that controls the speaker outputs also controls the unit to power up ? TA8263BH
Or am I looking for something else as to why it won’t power up
Unit will not power up fuse is good .
Wondering if the IC that controls the speaker outputs also controls the unit to power up ? TA8263BH
Or am I looking for something else as to why it won’t power up
Do you have 5v on the VDD pins of the microcontroller?
Do you see any pulses on any terminals of the microcontroller?
Do you see any pulses on any terminals of the microcontroller?
Base:13.13
Collector:0.22
Emitter:13.95
Reflowed solder on Q20 amd a few other components now o het 5 volts on pins 6,38 of the micro controller but deck still
Doesn’t power up
Collector:0.22
Emitter:13.95
Reflowed solder on Q20 amd a few other components now o het 5 volts on pins 6,38 of the micro controller but deck still
Doesn’t power up
Last edited:
Q20 should have been Q21 in post 6. It is the 5v regulator. Just a correction. It's not important now that you have 5v.
Do you see any pulses on any terminals of the microcontroller (IC1)?
What is the voltage on terminal 23 of IC1?
Do you see any pulses on any terminals of the microcontroller (IC1)?
What is the voltage on terminal 23 of IC1?
0.00 on pin 23
I don’t see any pulses on any of the pins on IC1 all I get is the ref line deflects
I don’t see any pulses on any of the pins on IC1 all I get is the ref line deflects
IC1 the longer the power is connected to the unit the warmer IC1 gets
On pins 35,36 I get nothing no signs of oscillation
On pins 35,36 I get nothing no signs of oscillation
The crystal oscillator terminals are sensitive to being measured but that (no signs of any oscilaltion on 10x) in addition to no other pulses being present may indicate that the IC has failed.