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 1.SRSINR

16.V+

 2.WIDTHR

17.MODE2

 3.SRSFILTERR

18.MODE1

 4.SRSOUTR

19.FOCUSOUTL

 5.FOCUSINR1

20.LPFIN

 6.FOCUSINR2

21.LPFOUT

 7.LFOUTR

22.HFINL

 8.LFINR

23.LFINL

 9.HFINR

24.LFOUTL

10.BCOUT

25.FOCUSINL2

11.BCIN

26.FOCUSINL1

12.FOCUSOUTR

27.SRSOUTL

13.REFIN

28.SRSFILTERL

14.VREF

29.WIDTHL

15.GROUND

30.SRSINL

1

15

30

16

LF
Elevation
Filter

LF
Elevation
Filter

HF
Elevation
Filter

HF
Elevation
Filter

BYPASS

FOCUS

FOCUS

BYPASS

Bass Compensation
Control

LF
Elevation
Control

SRS

BYPASS

SRS

BYPASS

SRS Filter

WIDTH
Control

SRS
Rch IN

SRS
Lch IN

FOCUS Lch IN

FOCUS Rch IN

SRS Rch OUT

SRS Lch OUT

FOCUS
Lch OUT

FOCUS
Rch OUT

FOCUS
Control

Bass
Compensation
Filter

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Pin  

Functi on 

Descri pti on 

1, 2 

DCAP2, DCAP1 

Charge pump switching pins.  DCAP1 (pin 2) is a free running 300kHz square 
wave between VDDA and DGND (12Vpp nominal).  DCAP2 (pin 1) is level shifted 
10 volts above DCAP1 (pin 2) with the same amplitude (12Vpp nominal), 
frequency, and phase as DCAP1. 

3, 8 

V5D, V5A 

Digital 5VDC, Analog 5VDC 

4, 7,  

15 

AGND1, AGND2, 

AGND3 

Analog Ground 

5 

REF 

Internal reference voltage; approximately 1.0 VDC. 

6 

OVERLOADB 

A logic low output indicates the input signal has overloaded the amplifier. 

9, 12 

VP1, VP2 

Input stage output pins. 

10, 13 

IN1, IN2 

Single-ended inputs.  Inputs are a ìvirtualî ground of an inverting opamp with 
approximately 2.4VDC bias. 

11 

MUTE 

When set to logic high, both amplifiers are muted and in idle mode.  When low 
(grounded), both amplifiers are fully operational.  If left floating, the device stays in 
the mute mode.  Ground if not used. 

14 

BIASCAP 

Input stage bias voltage (approximately 2.4VDC). 

16 

SLEEP 

When set to logic high, device goes into low power mode.  If not used, this pin 
should be grounded 

17 

FAULT 

A logic high output indicates thermal overload, or an output is shorted to ground, 
or another output. 

18, 28 

PGND2, PGND1 

Power Grounds (high current) 

19 DGND 

Digital 

Ground 

20, 22; 

25, 23 

OUTP2 & OUTM2; 

OUTP1 & OUTM1 

Bridged outputs 

21, 24 

VDD2, VDD1 

Supply pins for high current H-bridges, nominally 12VDC. 

26 NC 

Not 

connected 

27 

V

DDA Analog 

12VDC 

29 

CPUMP 

Charge pump output (nominally 10V above VDDA) 

30 

5VGEN 

Regulated 5VDC source used to supply power to the input section (pins 3 and 8). 

 

 

5VGEN

SLEEP

FAULT

PGND2

DGND

OUTP2

VDD2

OUTM2

OUTM1

VDD1

OUTP1

NC

VDDA

PGND1

CPUMP

DCAP2

AGND3

BIASCAP

IN2

VP2

MUTE

IN1

VP1

V5A

AGND2

OVERLOADB

REF

AGND1

V5D

DCAP1

30

16

17

18

19

20

21

22

23

24

25

26

27

28

29

1

15

14

13

11

10

12

9

8

7

6

5

4

3

2

30-pin Power SOP Package

(Top View)

LCD LED: ON

AVC-C LED: OFF

Check power switch, AC power cable and power unit of AVC-C.

LCD LED: OFF

AVC-C LED: ON

Check power switch, AC power cable and power unit of LCD.

LCD LED: BLINKING 

(Once per second)

Check system cable, power switch, AC power cable and power unit of AVC-C.

 LCD LED: BLINKING 

(4 times per second)

Check cooling fan, IC2102 and peripheral circuits.

LCD LED: ON IN RED

AVC-C LED: ON IN RED

LCD LED never turns to 

green.

Check power switch, AC power cable and power unit of LCD.

AVC-C LED never turns 

to green.

Check power switch, AC power cable and power unit of AVC-C.

LCD panel backlight 

never lights up.

Reset the lamp error count.  (See adjustment procedure.)

Check Q6551, Q6554, Q6557, Q6560, Q6563, and Q6566 as well as peripheral circuits.

Initialize EEPROM.  (See 

adjustment procedure.)

If not successful: Check power switch, AC power cable and power unit of LCD.

 No sound from speaker

NO

YES

YES

Does output icon denote speaker 

when operating audio volume control?

NO

NO

Does output icon denote lineout when 

operating audio volume control?

Monitor output in the main menu is set 

to "V

ariable". Switch it to "Fixed".

YES

Is audio output available at each related 

pin of IC2501 (MUL

TI SOUND 

PROCESSOR) normal?

Pins (36) and (37) of IC2501 (SC1 OUT

 

L/R)

YES

Check Q2505 and 2504 (Buf

fer) and 

its peripheral circuits

YES

Check PC I/F Unit and its peripheral 

circuits.

No audio output (SCAR

T1)

YES

Is audio output available at each 

related pin of IC2501 (MUL

TI SOUND 

PROCESSOR) normal?

Pins (27) and (28) of IC2501 

(SC1 OUT

 L/R)

YES

Check the circuit between pins (27) and 

(28) of IC2501 and pins (3) and (1) of 

SCAR

T1, as well as audio mute circuit.

NO

Is tuner audio input available at each 

related pin of IC2501

(MUL

TI SOUND PROCESSOR) normal ?

Pin (67) of IC2501 (SOUND IF1)

Pin (69) of IC2501 (SOUND IF2)

NO

NO

NO

Is audio output available at each related pin of 

IC1301 (A

V SWITCH) normal?

Pins (52) and (54) of IC1301 (L/R OUT1)

Pins (43) and (45) of IC1301 (L/R OUT2)

Pins (38) and (40) of IC1301 (L/R OUT3)

NO

No audio output (SCAR

T2/3)

YES

Is audio output available at each 

related pin of IC2501 (MUL

TI SOUND 

PROCESSOR) normal?

Pins (27) and (28) of IC2501  

(SC1 OUT

 L/R)

YES

Check the circuit between pins (27) and 

(28) of IC2501 and pins (3) and (1) of 

SCAR

T2/3, as well as audio mute circuit.

No monitor audio output

YES

Is normal audio output available at 

each related pin of IC2501 

(MUL

TI SOUND PROCESSOR)?

Pins (34) and (33) of IC2501

(SC2 OUT

 L/R)

YES

Check the circuit between pins (34) and 

(33) of IC2501 and J1

101 (monitor audio 

output), as well as audio mute circuit.

Check IC2501 (MUL

TI SOUND PROCESSOR) and its peripheral circuits.

Check B.P

.F

. of SIF1 and SIF2 respectively.

Check 

TU1

101 (U/V tuner) and peripherals.

Is each audio input circuit of IC1301 (A

V SWITCH) 

normal?

Between SCAR

T1 Pins (6), (2) and IC1301 Pins (2), (4)

Between SCAR

T2 Pins (6), (2) and IC1301 Pins (9), (1

1)

Between SCAR

T3 Pins (6), (2) and IC1301 Pins (16), (18)

Between front input (J3401) and IC1301 Pins (23), (25)

Between PC input (J3403) and IC1301 Pins (29), (31)

Check IC1301 (A

V SWITCH) and peripherals.

2