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203 Phaser

 

 

The Synton 203 uses the HA 4741 and LM324 as quad opamp (The HA 4741can be replaced by the LM348).

The powersupply regulator is a 4195 ) dual 15 volt.

 

Potmeter are Piher potmeters with 4 mm metal shaft.

 

The 222 can internal be switch from 220 to 110 volt.  If you must do that, i suggest remove the switch and wire the the transformer.  Do not forget the pcb board under the transformer!!

 

The 12 LDR are special philips LDR which are not availlable anymore.

 

 

Known parts problems:

  1. Broken quad opamps:  If an quad opamp is broken most of the time the output ( pin1, 7,8 and 14) is almost the same as the power supply. In some case that is fine, fi comparator.
    You can check this with a meter by measuring the output voltages of the opamp. Normaly you will measure zero or a small dc signal or a audio or lf signal. If you find an with + or - 15 volt ( in the case that the PSU is 15 volt) the opamp is bad. 
    You can check this by connecting the output pin with the next pin ( = - input, fi connect pin 1 with 2, connect pin 7 with 6). If the output voltage doesn't go to zero this opamp is bad.
  2. Broken tatalium caps. These caps at could give serious problems. They are used for decoupling caps in the powersupply lines. If they are broken  most of the time they short the power supply.  You will measure allmost zero volt at one or both (+/-) powersupply lines. They are hard to find. If you cannot locate these my advice cut them out and check or the power supply is ok. ( fi + or - 15 volt)
    If only one power line is shorted and the fuse is to big, the rectifier could also be broken. Check this also. The Syntovox 221 has a lot of tatalium caps!! You can replace them by other tantalium caps or by normal other caps. !! Pay attention to the polarity!!
  3. Broken LDR.  The synton phaser uses 12 special Philips LDR.  If these are broken you must find an other LDR. I have used as replacement the VT935G ) these fits in the blackbox.  The philips version is better but not availlable any more.

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