Heathkit AR-14 - TROUBLESHOOTING CHART

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Page 56
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TROUBLESHOOTING CHART
DIFFICULTY
Receiver completely dead.
Dial lamps not on.
Noise output only,
no
audio signal.
No sound, dial
lamps on.
Distorted output
signal.
AFC circuit does
not operate.
Non-linear
AFC action.
FM all right, no FM
stereo, stereo indicator
lamp does not light.
FM all right, no FM
stereo, but stereo in-
dicator lamp lights.
I
POSSIBLE CAUSE
1. Open AC line cord.
2. Blown fuse.
3. Faulty Off-On switch.
4. Defective power transformer.
1. Check antenna.
2. Local oscillator Q3 not operating.
1. Phase control knob pulled out.
2. Open or shorted output cables.
3. No B+ voltage.
4. Faulty silicon diode D200, D201, D202, or
D203.
5. Open
resistor R201.
6. Faulty filter capacitor, C202 or C203.
7. Choke L5
open.
8. Improper operation of one of the following
transistors: Ql through Q9.
1.
Misalignment of ratio detector transformer
T6.
2. Faulty transformer T6.
3. Shorted capacitor C40, C43 or C52.
4. Check FM alignment.
1. Check alignment of transformer T6.
2. Open or shorted diode Dl.
1. Check alignment of transformer T6.
2. Defective diode Dl.
1. Program is not stereo.
2. Open stereo indicator lamp.
3. Check alignment of coil L7.
4. Open or shorted coil L7 •
.
1. Check adjustment of Phase control.
2. Check adjustment of transformer T7.
3. Open or shorted transformer T7.
4. Shorted capacitor C48 or C49.
5. Improper operation of transistor Ql0.