ADC Sound Shaper Three Service Manual page 18

SYMPTOM CAUSE/REMEDY
13) Frequency control 260/320/390 1) Faulty VR505/605
Hz has no effect. "Repair or replace.
2) Defective R311/411, 312/412, 313/413, 343/443, 344/444 or L305/405
"Replace.
14) Frequency control 470/560/680 1) Faulty VR505/605
Hz has no effect. "Repair or replace.
2) Defective R314/414, 315/415, 316/416, 345/445, 346/446 or L306/406
"Replace.
15) Frequency control 840/1 K/l.2 K 1) Faulty VR507/607
Hz has no effect. "Repair or replace.
2) Defective R317/417, 318/418/319/419, 347/447, 348/448 or L307/407
"Replace.
16) Frequency control 1.5 K/l.8 K/ 1) Faulty VR508/608
2.15 K Hz has no effect.
"Repair or replace.
2) Defective R320/420, 321/421,322/422,349/449,350/450 or L308/408
"Replace.
17) Frequency control 2.6 K/3.2 K/ 1) Faulty VR510/610
3.9K Hz has no effect.
"Repair or replace.
2) Defective R323/423, 324/424, 325/425, 351/451,352/452 or L309/409
"Replace.
18) Frequency control 4.7 K/5.6 K/
1)
Faulty VR511/611
6.8K Hz has no effect. "Repair or replace.
2) Defective R326/426, 327/427,328/428,353/453,354/454 or L310/41 0
"Replace.
19) Frequency control 8.4 K/l 0 K/ 1) Faulty VR511/611
12 K Hz has no effect. "Repair or replace.
2) Defective R329/429, 330/430, 331/431, 355/455, 356/456 or L311 /411
"Replace.
20) Frequency control 15 K/18 K/ 1) Faulty VR512/612
21.5 K Hz has no effect. "Repair or replace.
2) Defective R332/432, 333/433, 334/434, 357/457, 358/458 or L312/412
"Replace.
21) All controls have no effect.
1) Defective Rlll/112 or Rl15/116
"Replace.
2) Defective Transistor TR 103-1 06
*Replace.
22) LED Meter does not light up. 1) Defective IC801
"Replace.
2) Defective IC802-814
*Replace.
3) Defective LED Meter D901-926
"Replace.
23) SIGNAL GAIN Control indicator 1) Defective TR 109-116
"Replace.
(LED) does not light up.
2) Defective IC201-203 "Replace.
3) Defective LED Dl 002-1 005 "Replace.
4) Defective Diode D207-210
"Replace.
24) Popping Noise Protector does
1) Defective TR201-203 *Replace.
not operate.
2) Defective D205 or D206
"Replace.
3) Defective Reed Relay *Repair or replace.
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