Gary L. Woodruff wrote:
Howdy all, I have a vintage Pioneer receiver. It will pick up AM
stations but is dead on FM. I do not get any deflection on the
tuning meters and no static. I do have a print. I do have b+ into
the board and have good voltages at the HA1156.
I do not see anything at the HA1137, with the exception of 13.8v at
pin 11 (should be 5.6v). There is only a coil in series with a cap
to gnd between b+ and this pin. I do not have a way to measure
inductance on the coil but have measured the cap .047 microfarads
is spec and I get .055. I am tempted to try to replace the IC (HA1137)
but am
concerned about the amount of voltage I see on pin 11 of the IC.
Any and all advice is GREATLY appreciated.


Thanks, Gary

That 5.6 voltage should be for pin 10, not pin 11. Pin 11 goes to
the B+ supply and the 13.8 v is correct.

Good luck.

Gary L. Woodruff wrote:
Dave, thanks for pointing that out. the 13.8 is the only voltage I
see on the HA1137. I do not see the input signal of 1.9v on pins
1,2,3 of the chip. I do see the 12.6 v at F2 but nothing after. I
will try to replace this fuse? F2 and the HA1137. Does this make
sense?
Thanks, Gary



F1 and F2 fuse one of the pairs of wires coming off of the secondary of the
power transformer. In the FM section, there is another component which also
labeled F2 which appears to be some sort of I.F. filter. You need to tell me
if by F2 you mean the fuse or if you mean the filter. You cannot have the
13.8 volts at pin 10 if the fuse is blown. Do you have the correct voltages
on Q4?

Good luck.
--
David Farber
David Farber's Service Center
L.A., CA