Guru
Joined: 11/02/2018
Location: AustraliaPosts: 3321
| Posted: 06:58am 17 Jan 2023 |
With both fuses removed the collectors are isolated so it should be possible to test them where they are. Check the resistance between B & E for Q! & Q2, they have internal resistors, value unknown but I expect something between 20 and 200 ohms.
What ever it is, they should be similar.
If that is the case the measurements you have taken indicate a problem elsewhere.
To further test Q2 set your PS to 10V and 100mA. Connect neg. to terminals 9 & 10 and pos. to the output end of F2 fuse holder. There should be no current. Now connect a 1k resistor from pos. to base. The current should now be close to the limit you set and the voltage between base and emitter about 1.1V.
For Q1 repeat with reversed polarity.
.
Edited 2023-01-17 17:03 by phil99