Saturday, February 27, 2016

PHILIPS HCD-NEZ30 CD DECK RECEIVER – Test mode – Factory reset - Panel test – CD error history – Audio amplifier circuit - STK453 -030A - Audio system repair and service

Category: Audio System Repair and Service 

Contents of this article 

  • Test mode 
  • Factory reset procedure 
  • CD Error History 

PHILIPS HCD-NEZ30

TEST MODE
COLD RESET
The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customer.
Procedure:
1. Press the POWER  button to turn the power on.
2. While pressing the STOP button, press the POWER  button and turn the [VOLUME] knob in the counter-clock wise.
3. The message “RESET” is displayed and the set is reset.
PANEL TEST
All segments of liquid crystal display are tested, and the version and released date of the micro computer are displayed.
Procedure:
1. Press the POWER  button to turn the power on.
2. While pressing the [DSGX] button, press the PREVOIUS  button and turn the [VOLUME] knob in the counter-clock wise.
Then all segments of liquid crystal display are turned on.
3. Press the [DSGX] button, the version and released date of the micro computer are displayed.
4. Press the [TUNER/BAND] button, the model name and destination are displayed.
5. Press the [PLAY MODE/TUNING MODE] button, “KEY 0 0” is displayed on the liquid crystal display, and key test mode in. Each time a key is pressed, the numerical value corresponding to each key is displayed on the liquid crystal display.
6. To exit from this mode, perform the “COLD RESET”
TUNER STEP CHANGE-OVER (Except UK and East European models)
Either the 9 kHz step or 10 kHz step can be selected for the AM channel step.
Procedure:
1. Set the FUNCTION to AM, and press the POWER  button to turn the power off.
2. While depressing the [TUNER/BAND] button, press the POWER  button.
3. The message “9K STEP” or “10K STEP” is displayed on the liquid crystal display, and thus the channel step is changed over.
CD ERROR HISTORY
When this mode is entered, optical pick-up error code is displayed with the 8-character format on the fluorescent indicator tube.
Procedure:
1. Set the FUNCTION to CD.
2. While pressing the [DSGX] button, press the CD PLAY button and turn the [VOLUME] knob in the counter-clock wise.
3. CD error history is displayed on the liquid crystal display. The first digit from the left indicates:
The first digit from the left indicates which mode the error history is. In the optical pick-up error code mode, “D” is displayed on the liquid crystal display.
The second digit from the left indicates:
(Error history No. display)
The second digit from the left indicates which order the error history is. “1” indicates the latest error history, and each time the number increases by one, the error history goes back to one-previous error. The third and 4th digit from the left indicates:
(Error status display)
The third and 4th digit from the left indicates which error status is indicated.
Display
Status
0 1
Not focused (TOC read without a disc)
0 2
GFS NG (TOC read with a disc chucked)
0 3
Start operation time-over
0 4
Defocused continuously (Defocused during TOC reading)
0 5
Q code not entered for specified time
0 6
Tracking not turned ON
0 7
Blank disc (Blank disc TOC read)
The 5th and 6th digit from the left indicates (Error step display)
The 5th and 6th digit from the left indicates which processing when a trouble occurred
Display
Contents
0 1
Power OFF in progress
0 2
Power ON in progress
0 3
Initialize in progress
0 4
Oscillation stopping
0 5
From oscillation stop, oscillation starting
0 6
Stopping
0 7
Stop operation is under way
0 8
Start operation in progress
0 9
TOC read in progress
0 A
Search operation is under way
0 B
Playback operation is under way
0 C
Pause operation is under way
0 D
Playback manual search operation is under way
0 E
Pause manual search operation is under way
CD POWER MANEGE
This mode is for switch the CD power supply on/off. Even if this state pulls out AC plug, it is held.
Procedure:
1. Press the POWER button to turn the power on.
2. Set the FUNCTION to CD.
3. Press the POWER button again to turn the power off (standby).
4. While pressing the CD u button, press the POWER button.
5. If turns power on and display “CD POWER”, then display “ON” or “OFF”.
POWER AMPLIFIER CIRCUIT 
USING STK453 –030A
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