Heathkit IM-4180 - Page 18

Page 55
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HBATHKIT®
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12. No SPKR output — or weak or distorted (deviation OK) | 1 Contral R4/switch SW2. |
| 2. Switch SW1. |
3 Capacitors Ci, Ci45, Ci46, C147, or C148.
|
|
4.
Transformer
T101.
|
| | 5. Integrated circuit U107. |
13. [ No SPKR output (in only one position of DE- | 1. Switch SW1. |
| EMPHASIS switch). | 2. Resistors A152 or Ai53. |
14. | No meter indication during “Main Circuit Board Calibra- | 1 Adjust coil L101.
tion.” 2. ‘Filter Y101.
| | 3. Or — (See items listed under Condition 9). |
15. | Will not calibrate to full scale. 1. Recheck 8V ADJ control R186.
2. integrated circuits U103-U 106.
SPECIFICATIONS
Carrier Frequency Ranges
On fundamental of locai oscillator ....... 25 — 50 MHz.
On harmonics of local oscillator ......... 50 — 1000 MHz.
Deviation Ranges ........ 0... cee ee eee 6-2, 6-7.5, 6-26, and 0-75 kHz peak.
Accuracy (full scale) ........... 0.0... eee eee +3%.
Sensitivity (Gain control fully cw)
25-50 MHz... cc cee eee 10 mV minimum.
50-500 MHz ........ cece cee eee eee eee 35 mV minimum.
500-1000 MHz ........... 0. cece ee eee 100 mV minimum.
rT marin ~
On 7.5, 20, and 75 kHz ranges .......... 250 Hz maximum.
On 2 kHz range.......... cece 100 Hz maximum.