05-01-2018, 08:45 AM
There is a - I suppose - tantal capacitor inside my HP-97 main baord with strange color code that has to be replaced.
[attachment=5877]
Orange head, pink - red - green lines. No colored dot but blue line to indicate anode I guess.
According to the service manual could be C1 (2.2 µF) as it's anode is attached to T1 inductor and cathode to 2 diodes - CR6 and CR7?
C3 located near ACT / PIK has the same strange color coding.
Not cleary visible in the lower part of the picture you can see yellow - purple (C6?) cap (orange marked head, brown or grey dot) and red - red - black dot (C4?) cap.
The board's layout isn't the one given in the service manual - all 5 ROM chips in a line. So the position of the other components is also different.
Anybody suggest a replacement? Is it 2.2 µF? Thank for your advice / experience.
Edit: added . in C1 2.2uF
[attachment=5877]
Orange head, pink - red - green lines. No colored dot but blue line to indicate anode I guess.
According to the service manual could be C1 (2.2 µF) as it's anode is attached to T1 inductor and cathode to 2 diodes - CR6 and CR7?
C3 located near ACT / PIK has the same strange color coding.
Not cleary visible in the lower part of the picture you can see yellow - purple (C6?) cap (orange marked head, brown or grey dot) and red - red - black dot (C4?) cap.
The board's layout isn't the one given in the service manual - all 5 ROM chips in a line. So the position of the other components is also different.
Anybody suggest a replacement? Is it 2.2 µF? Thank for your advice / experience.
Edit: added . in C1 2.2uF