SONY DD-1EX Data Discman Repair Retrostuff User Manual
- June 17, 2024
- Sony
Table of Contents
SONY DD-1EX Data Discman Repair Retrostuff
SUPPLEMENT-1
File this supplement with the service manual.
Subject : Test Mode
This unit includes the features described in the Service Manual in addition to
the following 5 test modes (Service Modes).
- F1 Mode: LCD check, servo system operation (normal CD Service Mode)
- F2 Mode: Data access operation (CD-ROM readout operation check)
- F3 Mode: Keyboard check
- F4 Mode: Self diagnosis, commander mode (Connection and operation check of each LSI, partially used for electrical adjustments.)
- F5 Mode : Debug mode (This mode is not applicable for service use.)
This supplement contains startup procedures of the test modes, as well as descriptions and procedures of the F1-F4 modes to assist in repair inspections.
TEST MODE STARTUP PROCEDURE
There are 2 methods to enable the startup of the test mode of the unit.
Multiple button operation method
- Press the STOP button to set the POWER OFF.
- While pressing the 3 ALPHABET/NUMBER F1 buttons, press the (POWER ON) button.
- Sony Bus Mode will be displayed on the LCD screen. Press function keys F1 – F4 and enter the appropriate mode.
Solder bridge short circuiting method
- Solder and short circuit the Service Mode on the main board with the external power supply removed (power is not supplied to the unit). Refer to the Service Guide for more details on the position of the tap.
- Plug the external power supply.
- Press the PLAY button to enter the F1 mode. After startup of the test mode, function keys F1 – F4 can be used any time. When entering another mode or restarting the same mode, press the appropriate function key of the mode. The current mode will be aborted and the selected mode will be entered.
EXITING THE TEST MODE
Exit the test mode by pressing the reset switch located under the main unit or by removing the external power supply. Remove the soldered tap which was short circuited during the test mode startup.
F1 MODE
The Fl mode performs the LCD dot check (FONT ROM check) and servo system operation check.
LCD check
When this mode is entered, the following 5 patterns (white-black—horizontal
line-vertical line-Kanji) are displayed repeatedly on the LCD screen at every
3- second interval. The current display on the screen is paused by pressing
the YES key on the keyboard and released by pressing the NO key. When
the Kanji is displayed without any distortion, it is assumed that the FONT ROM
check turned out OK. (The FONT ROM check is also performed in the F4 mode.)
The servo system operation check will still be performed when the connectors are removed and the LCD screen is not displaying.
Servo system operation check
- When the button is pressed, the optical pickup moves to the inner or outer periphery. When the 3 servo is turned ON and this operation is executed, the tracking servo and threading servo willturn OFF.
- When the key is pressed, the unit will enter CLV-S (With draw mode) while focus searching. When there is no disc, the spindle motor will turn and perform focus search.
- When the operations described in step 2 are performed, press the key once more. Muting will be cancelled and the tracking servo, threading servo and CLV-A (servo during PLAY) will be turned ON.
- PLAY will start when the operations in step 2 and 3 are performed. At this point, if S806 (door OPEN switch) is disabled, sound will not be emitted due to the muting operation, but it will be enabled bypushing the button again.
- All servos (focus, tracking, threading and spindle) will be turned OFF when the key is pressed.
- Use chucking plate assembly X-4924-729-1 and insert an 8cm CD when performing the above operation with the CD cover open. (Do not use radio cassette recorder chucking plate tool X-4918-255-1.)
F2 MODE
The F2 mode performs a CD-ROM data readout operation check. A hexadecimal data readout is displayed on the screen. The readout data is retrieved from the disk which is inserted in the electronic book player. The data is read out from an assigned location based on absolute time input designated by the user. The following screen is displayed when the unit enters the F2 mode.
Initial Screen
Press the numerical keys and set the absolute time in the input display section. Press YES , the electronic book will read out the data and display a 1- line 8-byte hexadecimal or ASCII-coded character after “Data:” readout. The CD-ROM operation check is OK when the following is displayed without any error.
The keys contain preset values. Pressing these keys will access and display the data from the preset point. The NO key initializes the input display section and enables time setting with the left and right cursors.
Screen After Data Readout
Normal Readout Enabled
Note: Only CDs that are compatible with the electronic book player can display data. Ordinary music CDs cannot display data. The contents of the data may vary depending on the electronic book player.
Error Screen
“NG!” is displayed after “Data:” Followed by the description of the error The error code is displayed in the dump area (details are not disclosed)
- The screen on the left indicates that the point cannot be read since the disc contains audio data
Error Messages
F3 MODE
- The F3 mode performs the operation and connection check of the 39 keys on the keyboard (excluding function keys ).
- When the keyboard is pressed, the corresponding keys are displayed. The check area display of the corresponding keys disappear as the keys are entered.
- The F3 keyboard check is OK when all the check area characters disappear after all the keys are entered (excluding the function keys).
- Function key check is performed in the initial screen of other test modes.
Initial Screen
F4 MODE
The F4 mode contains eight additional check functions (two of which are not applicable for service use) that are assigned to the keyboard. These can be roughly divided into two blocks: self-diagnosis and commander.
Initial Screen
LCD controller (IC811) interface check
When 2 is pressed from the F4 mode initial screen, data is written to the
display memory (IC810) via LCD controller (IC811) and read out to check
whether a normal value is returned. “OK” will be displayed when the unit
operates normally; “NG” will be displayed when the unit malfunctions. Check
the connection between system controller (IC801), extension 1/0 (IC 802) and
LCD controller (IC402) as well as the connection between LCD controller
(IC401) and display memory (IC402). IC401 and IC402 may be possibly defective.
CD-ROM decoder (IC607) interface check
When X is pressed from the F4 mode initial screen, data is written to the
register in the CD-ROM decoder (IC607) and read out to check whether a normal
value is returned.
“OK” will be displayed when the unit operates normally; “NG” will be displayed
when the unit malfunctions. When NG, IC607 may be possibly defective or check
the connection between extension I/O (IC802) and the CD-ROM decoder (IC607).
Main RAM (IC804) check
When C is pressed from the F4 mode initial screen, a 55 H (hexadecimal)
data is written to the main RAM (IC 804) from the leading address (8000H) in
order and read out to check whether the data has been properly written. (A “*”
mark is indicated for every 256 bytes when OK.) If OK, a similar check is
performed for the AAH (hexadecimal) data. (A “#” mark is indicated when ”
OK”.) When an error arises, “NG!” will be immediately indicated (see below).
Although 8000H – 80F FH and FF OOH – FFFFH are indicated with a “?” at all
times, note that this is not an error.
Normal
(Kanji) font ROM (IC805) check When V is pressed from the F4 mode initial screen, the Kanji font ROM (1C805) check can be performed. The entire data of the (Kanji) font ROM is divided into eight sections from page 0 – 7. The checksum results of each page is displayed. When NG, perform the address data bus check (especially for CA12 – CAO). Use in conjunction with the F1 screen.
Extension 1/0 (IC802) terminal Low mode
When B is pressed from the F4 mode initial screen, the terminals assigned
with the keyboard of the extension I/ 0 (IC802 will be set to the LOW level.
Direct command output mode to servo system (IC502, IC601)
When N is pressed from the F4 mode initial screen, direct command is sent to the servo (IC502) and CD digital signal processing (IC601) to enable manual control.
To facilitate input, A – H is changed to the A, B, …F keyboard arrangement in place of hexadecimal command input.
Key Assignment
The commands up to the left side of the cursor will be output when the YES key is pressed. The actual data output will be displayed on the upper section. Commands on the left side of the cursor that are less than 1 byte will not be output. Correction via cursor movements and re-outputs are enabled since the data is still displayed on the command -side after the commands have been output.
Command Examples
CXA1082BQ (IC502) Command List
*1 Gain SET
TG1 and TG2 can be independently set.
When ANTI SHOCK=1 (00011XXX), TG1 and TG2 is inverted when internal ANTI
SHOCK=H
CXD1167Q (IC601) Command List
Documents / Resources
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