bh | Heathkit AJ-1510 FM Tuner - Unit Log - |
Serial Number: | (sticker missing) |
1972 (7222 latest component date code) | |
Date of Receipt: | 2015 May |
Source: | JP |
State upon Receipt: | Grimy dust inside. Stick-on feet missing. Right side of chassis dented and bent. Functional state unknown. |
Comment: | This is an early AJ-1510 (not the 1510A). The earlier IF board (85-590-1) with IC606 is used. |
Date: | 2015 May |
Procedure: |
|
Date: | 2015 May |
Symptoms: | DC bias of several volts noticed in audio output channel. |
Procedure: | Tantalum capacitors at output of both audio channels (10uF/20V) replaced (10uF/35V). |
Date: | 2015 Jun |
Procedure: | Sweep-Speed pot swapped to 03611 unit. New pots installed for Sweep-Speed and Noise-Squelch. |
Date: | 2015 Jun |
Symptoms: | The design allows 3-digit channels to be entered as 3 digits rather than 4, but operation is requiring entry of an initial 0 - "0881" rather than "881". |
Procedure: | C207 & logic are intended to provide an additional shift pulse if first digit is 8 or 9. Bad soldering job on C207 (programmer board). Resoldered. |
Date: | 2016 May |
Symptoms: | Channels in the range 90.1 to 97.9 not working. |
Procedure: | Display is correct so likely a problem in the preload decoder area producing an incorrect code for the PLL. Bad solder joint on U309.14 (+5V) results in low outputs from gates of U309. Resoldered. |
Serial Number: | 03611 |
1976 (7606 latest component date code) | |
Date of Receipt: | 2015 May |
Source: | JP for repair |
State upon Receipt: | Mildly dusty inside. Fair condition. Hole drilled in front panel for screw to hold broken left mounting post. Functional state unknown. |
Comment: | This unit is a model AJ-1510A. The later IF board (85-1644-1) which replaces IC606 with discrete components is used. |
Date: | 2015 Jun |
Procedure: |
|
Date: | 2016 Apr |
Procedure: | Unit returned to Jurgen. |
Unit Log
Heathkit AJ-1510 |
bhilpert 2015 May |