REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 6 February 2019

MARANTZ SR18 – SCHEMATIC – ADJUSTMENTS - 5.1 AV SURROUND RECEIVER

marantz SR18 – Schematic – Adjustments - 5.1 AV Surround Receiver

Marantz AV Surround Receiver SR-18 U,K,KS
Rated Power
Stereo Mode FRONT (20 Hz − 20 kHz) ..... 8 ohms 140W / Ch (2ch driven)
Center (40 Hz − 20 kHz) ............................ 8 ohms 140W / Ch
Surround .................................................... 8 ohms 140W / Ch
Power Requirement ........................ AC 120V 60 Hz (U version)
AC 220 50/60 Hz (K version)
AC 230V 50 Hz (KS version)
Power Consumption ............470W
Dimension ( MAX )
Width ...................................18 inches (458 mm)
Height ..................................7-½ inches (190 mm)
Depth ...................................19-½ inches (496 mm)
Weight .................................49.7 lbs. (22.5 kg)
FACTORY mode (Tracking point memory)
This FACTORY mode can be use for measurement of the tuner circuit.
When the product is POWER ON, press both [ MEMO ] and [ DISPLAY OFF ] buttons simultaneously for more than 3 seconds.
FLD shows "FACTORY" for 3 seconds. Press [ PRESET ] button, FLD shows "PRESET SEL".
FLD segment check mode
This mode is available to check all luminous segments by the following steps.
1. When the product is FACTORY mode ( Refer to above mentioned "1. FACTORY mode"), press [ DISPLAY OFF ] button. FLD shows "SERVICE" for 2 seconds.
2. All segments and all LED light up for 5 seconds.
3. Each segment lights up step by step.
4. Press [ DISPLAY OFF ] button again, then this mode will be stopped and the product will be FACTORY mode.
Version of microprocessor (CPU)
This program is available to confirm the version of each CPU by the following steps.
QY01 (main) : When the product is POWER ON, press both [ CL ] and [ TREBLE ▼ ] buttons simultaneously over 3 seconds.
FLD shows the version of program code for QY01.
Q691 (DSP) : When the product is POWER ON, press both [ CL ] and [ BASS ▼ ] buttons simultaneously over 3 seconds.
FLD shows the version of program code for Q691.
Input and output test mode
This mode is available for the functions as shown in Fig 1 by the following steps.
1. When the product is FACTORY mode ( Refer to above mentioned "1. FACTORY mode"), press both [ MEMO ] and [ TREBLE▼] buttons simultaneously.
2. FLD shows "AUTO D1". By pressing both [ MEMO ] and [ TREBLE ▼ ] buttons simultaneously each time, the mode is changed.
Input selection mode (without setting to system setup menu)
This mode is available to select the input without setting to system setup menu by the following steps.
1. When FLD shows “AUTO D1” (4. Input and output test mode"), the input can be shifted by pressing [ MODE ] button for the remote commander only each time.
5.1 channels output mode
This mode is available to output the same signal from 5 channels, even though 2 channels audio signal comes in.
As the result, all channels output can be confirmed by using analog stereo signal or PCM audio signal.
AC-3 or DTS source is not necessary to output from any channel in this mode.
1. When FLD shows “ALL CH D1” (Refer to "4. Input and output test mode"), the input can be shifted by pressing [ MODE ] button of the remote commander. 
2. Supply to 2 channels PCM signal for digital input or 2 channels analog signal for analog input. But, Left channel and Right channel of input signal should be equal.
3. Then each output from the product is the same as the input signal. (Sub-woofer channel is respond to lower than 80Hz signal)
Circuit Diagram (Full)
Click on the Schematics to zoom in
Exploded view
Transistor MUTE mode
In mute situation on the product, output signal is muted by Volume control IC and muting transistor.
But, this mode is available to work the muting transistor only by the following steps.
1. When the product is FACTORY mode ( Refer to "1. FACTORY mode"), press [ MUTE ] button for remote commander only.
2. FLD shows “TrMUTE ON”, then muting transistor circuit is active only.
 How to reset the product
When the product is POWER ON, press both [ CL ] and [ DISPLAY OFF ] buttons simultaneously.
FLD shows "DEFAULT" for 3 seconds, and then all memories are cleared.
Thermostat circuit confirmation
1) When the product is POWER ON, remove the wire W701 from the connector J715 (P704).
2) FLD shows "ERROR PWR1".
3) Confirm the product is POWER OFF after 3 seconds.
4) Connect the wire W701 to the connector J715 (on P704).
5) Confirm the product is standby status.
Cooling fan confirmation
 Fan failure sensor confirmation
1) Set to be SPK output 1W from the front channel.
2) Connect the 1pin (LOCK) of the connecter JN10 (on P754) to chassis (GND level) by a wire.
3) After 6 seconds the SPK relay works, and the SPK output isn’t output.
Temperature sensor confirmation
1) Connect a resistor (470ohms 1W) between JN10 3pin (T-2CH) and DC +12Voltages.
2) Confirm the cooling fan starts working. (Status : JN09 between 1pin and 2pin = +7.5 volt, Fan speed = Low)
3) Remove the resistor.
4) Confirm the cooling fan stops.
5) Connect the resistor between JN10 4pin (T-3CH) and DC +12Voltage.
6) Confirm the cooling fan starts working again.
7) Remove the resistor.
8) Confirm the cooling fan stops.
9) Connect the resistor between JN10 3pin (T-2CH) and DC +12 Volt. And then connect another resistor between JN10
4pin (T-3CH) and DC +12 Volt.
10) Confirm the cooling fan starts working.
11) And then connect the resistor between JN10 2pin (SPEED) and DC +12 Volt.
12) Confirm the cooling fan changes to work with high speed. (Status : JN09 between 1pin and 2pin = +11.5 Volt, Fan speed = High)
Fan catching a foreign body sensor confirmation
1) Connect the resistor (470ohms 1W) between JN10 3pin (T-3CH) and DC +12 Volt.
2) Confirm the cooling fan starts working. (Status : JN09 between 1pin and 2pin=+7.5 Volt, Fan speed = Low)
3) Set to be SPK output 1W from the front channel.
4) Hold the cooling fan by hand and stop it.
Notes: Take care of wound in the hand.
5) After 6 seconds the SPK relay works and the SPK output isn’t output
Posted By: FRANK at 05:51
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