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Old 11-08-2006, 01:14 PM
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jblmar jblmar is offline
JBL & marantz
 
Join Date: Aug 2004
Location: Brooklyn, New York
Posts: 30
Hi all,
Just a follow up on the set. Thanks to all for your input.
The problem has returned! I went through the PCB and found 2 capacitors that measured 0 mF. I replaced one on the output board. I need to get the other on the Raster Blanking board.
The voltage regulator (Q 201) checked out o.k on diode test and voltage test. Next step was the vertical output transistors for voltage.
A cold solder was found on the output board. Resoldering returned the proper bias voltage to Q707. All measurements on the board are now correct. On to the next board(s).
I'll replace C908 on the Raster board and post the results.
I need to go through all boards and wire soldered components in the set. If 2 caps are bad, there's more.
This set is very easy to work on. I can't setup the 'scope for lack of room to work. Have to do it the hard way.

Ron
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Marantz 300DC 3650 2130
TEAC A6100 MKII A6300
A4300 Parts
JBL 2235H 2225H 2425J 3110A 2370 4507
Technics SP25 Profile II & V15 IV
Denon:DCD 610
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