Monday, February 08, 2016

SONY - FM-AM RECEIVER - STR-DH130 – Test mode – FM Tuner check – Power amplifier circuit diagram – Audio system repair and service

                                                                Category: Audio System Repair and Service 

Contents of this article 

  • Accessing Test modes 
  • FM Tuner cheeking 
  • Power Amplifier schematic digram 



SONY STR-DH130

TEST MODE
AM CHANNEL STEP 9 kHz/10 kHz SELECTION MODE (US, Canadian model only)
Either the 9 kHz step or 10 kHz step can be selected for the AM channel step.
Procedure:
1. While pressing the [TUNING MODE] button, press the [POWER] button to turn on the main power.
2. The message “9K STEP” or “10K STEP” appears for a moment and the channel step is changed.
SOFTWARE VERSION DISPLAY MODE
The software version is displayed.
Procedure:
1. While pressing the [SPEAKERS (OFF/A/B/A+B)] and the [MUTING] buttons simultaneously, press the [POWER] button to turn on the main power.
2. The destination and the software version are displayed.
KEY CHECK MODE
Button check
Procedure:
1. While pressing the [SPEAKERS (OFF/A/B/A+B)] and the [DIMMER] buttons simultaneously, press the [POWER] button to turn on the main power.
2. The message “REST 13” appears.
3. Every press of any button other than the [POWER] counts down the buttons. The buttons which are already counted once are not counted again. When all buttons are pressed “REST 00” appears.
VACUUM FLUORESCENT DISPLAY TEST MODE
All fluorescent segments are tested. When this test is activated, all segments light on at the same time, then each segment lights on one after another.
Procedure:
While pressing the [SPEAKER (OFF/A/B/A+B)] and the [DISPLAY] buttons simultaneously, press the [POWER] button to turn on the main power.
1. ALL segments light on.
2. Turn the [INPUT SELECTOR] control, confirm display.
3. Turn the [INPUT SELECTOR] control, confirm display.
4. Turn the [INPUT SELECTOR] control, all segments light off.
HISTORY MODE
The state that the set is used is memorized.
Procedure:
1. While pressing the [TREBLE +] and [SPEAKERS (OFF/A/B/A+B)] buttons, press the [POWER] button to turn on the power and “HISTORY” is displayed.
2. Each time the [UP]/[DOWN] buttons on the remote commander is pressed, the item is switched in order as follows.
Item
Display
History
HISTORY
Count how many time of protector happen
COUNT xx
Total single power on time
xxxxxHxx01
Input function
FUNCTION
HP ON/OFF
HP xxx
Volume
VOL xxx
Bass
BASS xxx
Treble
TREB xxx
Balance
F xxx
Total power on time
xxxxxHxx02
Muting
MUTE xxx
Power on counter (Rebox Test Mode)
REBXxxxx
Protector Type
PROTxxxx
VACS step
VACS xx
Return to history
HISTORY
PROTECTOR AUTO OFF
To disable auto off after protector occur
Procedure:
1. While pressing the [TREBLE -] and [SPEAKERS (OFF/A/B/ A+B)] buttons, press the [POWER] button to turn on the main power.
2. “PROT OFF” appears and switch off the set.
SHIPMENT MODE
All preset contents are reset to the default setting.
Procedure:
1. While pressing the [TUNING MODE] and the [MUTING] buttons simultaneously, press the [POWER] button to turn on the main power.
2. “CLEARING” and “CLEARED” appear and switch off the set.
DESTINATION WRITE MODE
Write the set destination when the destination is “UNKNOWN”.
This mode can be performed once only.
Procedure:
1. Press the [POWER] button to turn on the main power.
2. Press the [FM MODE] and [DISPLAY] buttons simultaneously.
3. “DEST XXX” appears and turns [INPUT SELECTOR] to select the required destination.
Selection
Destination
DEST U2
U.S.A
DEST CEL
Europe
DEST CA2
CANADA
4. Press [MEMORY/ENTER] button to save the destination.
5. “CLEARING” and “CLEARED” appear and the set will switch on.
6. Perform [SOFTWARE VERSION DISPLAY MODE] to confirm the written destination.
FM TUNER CHECK
Procedure:
1. Turn on the set.
2. Input the following signal from Signal Generator to FM
antenna input directly.
Carrier Frequency: A=87.5 MHz, B=98 MHz, C=108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note:
Please use 75 ohm “coaxial cable” to connect SG and the set. You cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with automatic scanning.
4. Confirm that input Frequency of A, B and C are detected and automatic scanning stops.
The stop of automatic scanning means “The station signal is received in good condition.”
POWER AMPLIFIER SCHEMATIC DIAGRAM 
USING STK350-630TS-E
CLICK ON THE IMAGE TO ZOOM IN