SDP-E800 - Sony Audio Service Manual (repair manual). Page 13

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After executing the test mode, be sure to perform initialization.

When the  POWER  button is pressed while pressing the  DIGITAL 1
button and  DIGITAL 3  button, “All Clear!” is displayed on the
fluorescent display tube and all internal settings are initialized.

With the power OFF, while pressing the  DIGITAL 3  button and  

∨

button togher, press the  POWER  button to turn ON the power.
The fluorenscent display tube all lit modewill be set.

This unit is provided with a “self-diagnosis and self-recovery func-
tion” which detects DSP errors and automatically recovers the unit,
and a test mode for performing operation checks during repairs.

1. DSP Error Messages
2. Various operation check mode
3. Initialization

While pressing the  DIGITAL 2  button and  ANALOG  button
simultaneously in the power OFF state, press the  POWER  button.

When errors occur in the DSP, they are displayed on the fluorescent
display tube.
(Refer to Table 1 for the error messages displayed.)

• During the operation check mode, functions can be set by press-

ing the corresponding button. (See Table-2.)

• When a button other than those displayed in Table 2 is pressed,

press the  POWER  button to exit the check mode.

Button

Function

Fluorescent
Display Tube
Display

DIGITAL1

OPT-1
(L-FL, R-FR)

Like normal operations, Lch is output to
Lch and Rch to Rch.

DIGITAL2

OPT-2
(L-SL, R-SR)

Outputs the Lch DIGITAL-2 input signal
to the REAR Lch and the Rch to the REAR
Rch.

DIGITAL3

OPT-3
(L-C, R-SW)

Outputs the Lch DIGITAL-3 input signal
to the CENTER and the Rch only to the
WOOFER.

ANALOG

COAX
(L, R-ALL)

Outputs the Lch DIGITAL 1 COAXIAL
input signal to the FRONT Lch, REAR
Lch, CENTER, and the Rch to the FRONT
Rch, REAR Rch, and CENTER.

Possible cause

1 Failed in initial

booting
(BOOT ERROR)

2 DSP does not

operate
(RPLY ERROR)

3 Communication

port malfunction
(HREQ ERROR)

4 No reply from

DSP
(VRFY ERROR)

Mostly due to faulty connection (soldering)
between DSP and microprocessor

Faulty DSP clock (X102 and onwards), faulty
DSP part, etc.

Overrunning of DSP due to heat, micropro-
cessor bugging, or IC701 (PLL board PLL) is
faulty

Faulty DSP part, or faulty microprocessor part,
etc.

Cause of error

(Display)

Button name

Fluorenscent display tube state

DIGITAL 1

DIGITAL 2

DIGITAL 3

ANALOG

All lit

Partial lighting 1

Partial lighting 2

OFF

When the other buttons are pressed, press the  POWER button to
exit the mode.

Partial lighting 1

Partial lighting 2

When the  POWER  button is pressed while pressing the  DIGITAL 1
button and  ANALOG  button, “KEY CHECK:12 KEYS” is dis-
played on the fluorescent display tube and the key check mode is
set.
When the  POWER  button is pressed during this mode, the number
at “12 KEYS” is counted down. When all other buttons are pressed,
the number stops at “00 KEYS” (Note: The number is not counted
down when buttons already pressed once are pressed again.).
To exit the mode, press the  POWER  button and turn OFF the
power.