But if there was a signal on that line wouldn't I see it at the measurment point in the previous picture - IC8 socket pin 2? At that point the scope probe shouldn't affect it I wouldn't think since there is 2R66 (82 ohm) load across 2L14. I tested a signal going through to that point with a frequency generator (2MHz signal) and read it with

To rule out a faulty cable or connection between the tuner board and the microcomputer board I checked continuity between P26-1,2 and P7-2,1. I also disconnected the P26 connector from the tuner board and used a frequency generator to send signals through the cable to make sure I could measure them okay on the IC8 socket pin 2...which I could. That

I think the LEDs are probably the issue here. I only had the clear ones I tried and some yellow ones. The LEDs I tried don't radiate the light very well. They are very bright directly out the front. I tried filing down the tops to difuse the light out more but I didn't notice any difference. I forgot to mention that I tried the two LEDs on a

I created a couple of led lamp substitutes for the volume lamps. I had four clear/white LEDs to make two assemblies. I'm not happy with the result though. The light is too dim. The LEDs are ROHM SLA560WBC7T2 with a forward voltage of 3.2V (@20ma) and a typical brightness of 1000mcd. The picture here is the first attempt. It used a load resistor

On the frequency signal, I pulled the IC8 from the socket and checked for the signal on the IC8 pin 2 location of the socket and I'm not seeing anything there. Hopefully this new IC8 is still good.

I used the simulator to check out the volume illumination. I tried to match the current with the load resistor in the LED circuit close to what the lamps are probably drawing. To get the exact value the same I would have to use 6 ohms for the load resistor. But with tolerances and the fact that the simulator isn't exact I am figuring that the LED

Olly, I am not understanding the service manual steps in adjusting the reset. The reset circuit gets its +5V power reference from the same place as the IC4 processor chip which is through P5-3 and P5-4 from the 06 Module (uC-Supply). From what I can tell in the 6-5 part of the service manual is that I would need to control that +5V source voltage while

In the service manual section 6-5 I saw the diagram of voltage ranges and what the processor will do (in those ranges). I just made sure the the Reset line was at +5V during working and standby modes. So you connected the LEDs in series like this? P5-5 (+6.5 ) --> LED1 --> LED2 --> 2R88 --> P5-6

I just looked at the two volume illumination bulbs with a magnifier and both of them have broken filaments so that explains that. Too much jossling around when I was working on the 02 board.

Thanks for the support guys. The information I received has really helped. One thing I have found about documenting a repair like this is that it helps me think about the task more. For example when writing it down I often catch something I forgot to try. It is also nice to go back and review steps to see what I already tried or missed. In looking back