Vintage SONY Digital Clock Radio ICF-C12W no audio

[CapLeaker]

Now figure out:
A: Is the faulty unit drawing so much current that the voltage drops that much on the transformer
B: Is the transformer delivering proper voltage?

[UserXP]

Yes, the power transformer in the faulty unit outputs dual ~6 volt. It is a center tap PT and measures 5.9 and 6.1 volts, giving 11.9-12 volts total. This is almost identical in the working unit, differences are maybe 0.1 volts up or down.
Which part would you want me to check about the current, what to probe in series with the multimeter?

[stj]

do you get the 15v and 30v from the power rectifier circuit?

[UserXP]

do you get the 15v and 30v from the power rectifier circuit?

No, I only get 2.56v and 7.56v after recification.

[stj]

double-check none of the new caps are in backwards

[UserXP]

double-check none of the new caps are in backwards

Already done that. I visually checked each cap. Also, I took pictures of the top of the board with the old and with the new caps and compared the two. All negative stripes are oriented the same way in both images.

[stj]

try isolating the power circuit from each section and see if the voltages return to normal

[UserXP]

try isolating the power circuit from each section and see if the voltages return to normal

I will attempt that. I am awaiting the original Sony ICF-C12W service manual. I have the C12L version. Although the function board is the same, I noticed there is a slight difference in the components layout where the power supply connects to the main board. Maybe C12W has slighly different voltages to check against. The manual should tell. I don't know what else to try, all the caps are properly soldered and in their right place, all the components I removed (diodes and a few ceramic capacitors) check out OK, but the power is still low. I only haven't checked the transistors, though the power and heat in tose sections are so low I couldn't imagine how they may have become blown or something.

[stj]

it sounds like something is pulling too much power - probably a diode or ceramic cap

[UserXP]

I did some additional measurements. I measured voltages on the transistors Q4, Q5, Q6 and Q7 (in volts). The C12L manual I currently have has two models covered: UK (with FM, MW and LW bands), and AEP (only FM and AM bands, like mine).

Q4 voltages:
E = 0.00
B = 0.62
C = 3.07

Q5 voltages:
E = 3.67
B = 4.27
C = 7.44
Voltages here are also less than in the manual.

Q6 voltages:
E = 3.67 (manual suggests 6.8)
B = 3.06 (manual suggests 6.2)
C = 0.00
Something appears to be drpping the voltage here by 3.2V.

Q7 voltages:
E = -0.18
B = 0.64
C = 0.00