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Hi-Fi Component
SERVICE MANUAL
MODEL AVR-3801
AV SURROUND RECEIVER
Some illustrations using in this service manual are slightly different from the actual set.
AVR-3801
BLOCK DIAGRAM
1 2 3 4 5 6 7 8 9 10 11
A
B
C
D
E
F
G
H
61
AVR-3801
WIRING DIAGRAM
1 2 3 4 5 6 7 8 9 10 11
A
B
C
D
E
F
G
H
62
AVR-3801
SCHEMATIC DIAGRAMS (1/15)
1 2 3 4 5 6 7 8 9 10 11
A
B
A B
C
D
+ 15V
- 15V
E
F
C + B LINE
D
- B LINE
G SIGNAL
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY r eplacement parts recommended by the manufacture. SCHEMATIC DIAGRAMS (1/15)
CAUTION: 1U-3320 (1/4) AUDIO/DSP UNIT
NOTICE Before returning the unit to the customer, make sure you make either (1) a
H leakage current check or (2) a line to chassis resistance check. If the leakage
ALL RESISTANCE VALUES IN OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES IN MICRO FARAD. P=MICRO-MICRO FARAD current exceeds 0.5 milliamps, or if the resistance from chassis to either side
EACH VOLTAGE AND CURRENT ARE MEASUERD AT NO SIGNAL INPUT of the power card is less than 460 kohms, the unit is defective.
CONDITION. WARNING:
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR DO NOT return the unit to the customer until the problem is located and
NOTICE. corrected.
63
AVR-3801
SCHEMATIC DIAGRAMS (1/15)
1 2 3 4 5 6
A
B
C
D
7 8 9 10 11
+ 15V
- 15V
E
F
G
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY r eplacement parts recommended by the manufacture.
CAUTION:
NOTICE Before returning the unit to the customer, make sure you make either (1) a
H leakage current check or (2) a line to chassis resistance check. If the leakage
ALL RESISTANCE VALUES IN OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES IN MICRO FARAD. P=MICRO-MICRO FARAD current exceeds 0.5 milliamps, or if the resistance from chassis to either side
EACH VOLTAGE AND CURRENT ARE MEASUERD AT NO SIGNAL INPUT of the power card is less than 460 kohms, the unit is defective.
CONDITION. WARNING:
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR DO NOT return the unit to the customer until the problem is located and
NOTICE. corrected.
63
+ B LINE
- B LINE
SIGNAL
SCHEMATIC DIAGRAMS (1/15)
1U-3320 (1/4) AUDIO/DSP UNIT
AVR-3801
SCHEMATIC DIAGRAMS (2/15)
1 2 3 4 5 6 7 8 9 10 11
A
+ 5V
A B B
C
D
+ 3.3V
+ 5V
E
C D F
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR G
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage + B LINE H
current exceeds 0.5 milliamps, or if the resistance from chassis to either side SCHEMATIC DIAGRAMS (2/15)
of the power card is less than 460 kohms, the unit is defective. SIGNAL 1U-3320 (2/4) AUDIO DSP UNIT
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
64
SCHEMATIC DIAGRAMS (2/15)
1 2 3 4 5
AVR-3801
6 7 8 9 10 11
A
+ 5V
B
C
D
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
+ 3.3V
+ 5V
E
F
G
+ B LINE H
SCHEMATIC DIAGRAMS (2/15)
SIGNAL 1U-3320 (2/4) AUDIO DSP UNIT
64
AVR-3801
SCHEMATIC DIAGRAMS (3/15)
1 2 3 4 5 6 7 8 9 10 11
A
B
A + 5V
+ 3.3V
B
C
+ 5V
D
E
F
C D
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
G CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacement parts recommended by the manufacture.
+ B LINE CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
SIGNAL leakage current check or (2) a line to chassis resistance check. If the leakage
H current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
SCHEMATIC DIAGRAMS (3/15) DO NOT return the unit to the customer until the problem is located and
1U-3320 (3/4) AUDIO/DSP UNIT corrected.
65
AVR-3801
SCHEMATIC DIAGRAMS (3/15)
1 2 3 4 5 6
A
B
C
D
7 8 9 10 11
+ 5V
+ 3.3V
+ 5V
E
F
G
H
65
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacement parts recommended by the manufacture.
+ B LINE CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
SIGNAL leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
SCHEMATIC DIAGRAMS (3/15) DO NOT return the unit to the customer until the problem is located and
1U-3320 (3/4) AUDIO/DSP UNIT corrected.
AVR-3801
SCHEMATIC DIAGRAMS (4/15)
1 2 3 4 5 6 7 8 9 10 11
A
+ 5V
B
A B C
+ 5V - 15V
+ 15V
D
E
+ B LINE
- B LINE
SIGNAL
NOTICE F
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
D
CONDITION.
C CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol
CAUTION:
have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage G
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
H
SCHEMATIC DIAGRAMS (4/15)
1U-3320 (4/4) AUDIO DSP UNIT
66
SCHEMATIC DIAGRAMS (4/15)
1 2 3 4 5
+ 5V
+ 5V
AVR-3801
6 7 8 9 10 11
A
B
C
- 15V
+ 15V
D
E
+ B LINE
- B LINE
SIGNAL
NOTICE F
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage G
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
H
SCHEMATIC DIAGRAMS (4/15)
1U-3320 (4/4) AUDIO DSP UNIT
66
AVR-3801
SCHEMATIC DIAGRAMS (5/15)
1 2 3 4 5 6 7 8 9 10 11
A
B
A B
C
- 15V
D
+ 15V
E
F
C D
NOTICE
G ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
+ B LINE Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
- B LINE CAUTION:
H Before returning the unit to the customer, make sure you make either (1) a
SIGNAL leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
SCHEMATIC DIAGRAMS (5/15) WARNING:
DO NOT return the unit to the customer until the problem is located and
1U-3316 EXT IN VR UNIT
67 corrected.
AVR-3801
SCHEMATIC DIAGRAMS (5/15)
1 2 3 4 5 6
A
B
C
D
7 8 9 10 11
- 15V
E
F
G
H
67
+ 15V
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
+ B LINE Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
- B LINE CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
SIGNAL leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
SCHEMATIC DIAGRAMS (5/15) WARNING:
DO NOT return the unit to the customer until the problem is located and
1U-3316 EXT IN VR UNIT
corrected.
AVR-3801
SCHEMATIC DIAGRAMS (6/15)
1 2 3 4 5 6 7 8 9 10 11
+ 5V
A
+ 15V
- 15V
+ 59V
+ 59V
B
A + 20V
B
C
D
- 33V - 59V
+ 59V
E
+ 5.4V
+ 6V
+ 5V
C + 6.4V
D F
G
WARNING: NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
Parts marked with this symbol have critical characteristics.
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
Use ONLY replacemen t parts recommended by the manufacture.
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CAUTION: CONDITION.
Before returning the unit to the customer, make sure you make either (1) a CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
+ B LINE leakage current check or (2) a line to chassis resistance check. If the leakage NOTICE. H
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
- B LINE of the power card is less than 460 kohms, the unit is defective.
WARNING: SCHEMATIC DIAGRAMS (6/15)
SIGNAL DO NOT return the unit to the customer until the problem is located and 1U-3317-2 CONNECT UNIT
corrected. 1U-3317-3 FRONT UNIT
68
SCHEMATIC DIAGRAMS (6/15)
1 2 3 4 5
+ 15V
- 15V
AVR-3801
6 7 8 9 10 11
+ 5V
A
+ 59V
+ 59V
B
+ 20V
C
D
+ 6.4V
- 33V - 59V
+ 59V
E
+ 5.4V
+ 6V
+ 5V
F
G
WARNING: NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
Parts marked with this symbol have critical characteristics.
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
Use ONLY replacemen t parts recommended by the manufacture.
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CAUTION: CONDITION.
Before returning the unit to the customer, make sure you make either (1) a CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
+ B LINE leakage current check or (2) a line to chassis resistance check. If the leakage NOTICE. H
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
- B LINE of the power card is less than 460 kohms, the unit is defective.
WARNING: SCHEMATIC DIAGRAMS (6/15)
SIGNAL DO NOT return the unit to the customer until the problem is located and 1U-3317-2 CONNECT UNIT
corrected. 1U-3317-3 FRONT UNIT
68
AVR-3801
SCHEMATIC DIAGRAMS (7/15)
1 2 3 4 5 6 7 8 9 10 11
A
+ 20V
B
B
+ 15V
A
C
D
E
+ B LINE
SIGNAL
F
C NOTICE
D
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
G CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
H
SCHEMATIC DIAGRAMS (7/15)
1U-3318-1 AMP CONNECT UNIT
1U 3318-2 PRE OUT UNIT
69
AVR-3801
SCHEMATIC DIAGRAMS (7/15)
1 2 3 4 5 6
A
+ 20V
B
+ 15V
C
D
7 8 9 10 11
E
F
G
H
69
+ B LINE
SIGNAL
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
SCHEMATIC DIAGRAMS (7/15)
1U-3318-1 AMP CONNECT UNIT
1U 3318-2 PRE OUT UNIT
AVR-3801
SCHEMATIC DIAGRAMS (8/15)
1 2 3 4 5 6 7 8 9 10 11
A
B
A B C
+ 20V D
E
+ B LINE
SIGNAL
F
D
NOTICE
C ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
+ 20V CAUTION: G
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
H
SCHEMATIC DIAGRAMS (8/15)
1U-3315-2 SP F UNIT
1U-3315-3 SP S UNIT
70
SCHEMATIC DIAGRAMS (8/15)
1 2 3 4 5
+ 20V
AVR-3801
6 7 8 9 10 11
A
B
C
D
+ 20V
E
+ B LINE
SIGNAL
F
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
CAUTION: G
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and
corrected.
H
SCHEMATIC DIAGRAMS (8/15)
1U-3315-2 SP F UNIT
1U-3315-3 SP S UNIT
70
AVR-3801
SCHEMATIC DIAGRAMS (9/15)
1 2 3 4 5 6 7 8 9 10 11
+ 0.4V
+ 59V
+ 58.5V
+ 1.2V
+ 57.9V
A + 0.6V
+ 31V + 1.1V
- 1.1V
- 1.2V
- 59V
+ 0.3V
- 56.8V
- 56.2V - 56.2V
B
A + 59V
B
C
- 59V
D
+ 6V
+ 10.5V
E
D
F
C + B LINE
- B LINE
SIGNAL
NOTICE
ALL RESISTANCE VALUES I N OHM. k=1,000 OHM M=1,000,000 OHM
G ALL CAPACITANCE VALUES I N MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRE NT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacemen t parts recommended by the manufacture.
CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
H leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
SCHEMATIC DIAGRAMS (9/15) DO NOT return the unit to the customer until the problem is located and
1U-3315-1 POWER UNIT corrected.
71
AVR-3801
SCHEMATIC DIAGRAMS (9/15)
1 2 3 4 5 6
+ 0.4V
+ 59V
+ 58.5V
+ 1.2V
+ 57.9V
A + 0.6V
+ 31V + 1.1V
- 1.1V
- 1.2V
- 59V
+ 0.3V
- 56.8V
- 56.2V - 56.2V
B
C
D
7 8 9 10 11
+ 59V
- 59V
+ 6V
E
F
G
H
71
V
+ 10.5V
+ B LINE
- B LINE
SIGNAL
NOTICE
ALL RESISTANCE VALUES IN OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES IN MICRO FARAD. P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRENT ARE MEASUERD AT NO SIGNAL INPUT
CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
NOTICE.
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY r eplacement parts recommended by the manufacture.
CAUTION:
Before returning the unit to the customer, make sure you make either (1) a
leakage current check or (2) a line to chassis resistance check. If the leakage
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
of the power card is less than 460 kohms, the unit is defective.
WARNING:
SCHEMATIC DIAGRAMS (9/15) DO NOT return the unit to the customer until the problem is located and
1U-3315-1 POWER UNIT corrected.
AVR-3801
SCHEMATIC DIAGRAMS (10/15)
1 2 3 4 5 6 7 8 9 10 11
A
+ 5V + 9V
+ 5V
A + 6.4V
+ 10.1V
B + 5V
B
+ 20V + 24.6V
C
+ 15V
- 15V + 25.7V
D
E
C D F
+ B LINE
- B LINE
SIGNAL
G
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY r eplacement parts recommended by the manufacture.
CAUTION:
NOTICE Before returning the unit to the customer, make sure you make either (1) a SCHEMATIC DIAGRAMS (10/15)
leakage current check or (2) a line to chassis resistance check. If the leakage 1U-3319-1 REGULATOR UNIT
ALL RESISTANCE VALUES IN OHM. k=1,000 OHM M=1,000,000 OHM
ALL CAPACITANCE VALUES IN MICRO FARAD. P=MICRO-MICRO FARAD
current exceeds 0.5 milliamps, or if the resistance from chassis to either side
1U-3319-4,5 DIGITAL INPUT UNIT H
of the power card is less than 460 kohms, the unit is defective.
EACH VOLTAGE AND CURRENT ARE MEASUERD AT NO SIGNAL INPUT 1U-3319-11/1U3319-12 VOLTAGE SELECT UNIT
CONDITION. WARNING:
DO NOT return the unit to the customer until the problem is located and
1U-3319-8 PT902 UNIT
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR
corrected. 1U-3319-9 PT903 UNIT
NOTICE.
72
SCHEMATIC DIAGRAMS (10/15)
1 2 3 4 5
+ 5V + 9V
+ 5V
+ 6.4V
+ 10.1V
+ 20V + 24.6V
+ 15V
- 15V + 25.7V
AVR-3801
6 7 8 9 10 11
A
B
+ 5V
C
D
WARNING
Parts m