E852 Documentation: Detectors: LGD - HV spare parts
LGD HV spare parts
1. Current status of HV base repair.
<![CDATA[ During the period 11/15/95 - 01/15/96 120 HV bases were repaired.
The most of them had damages of operational amplifiers or transistors (OA
and VT problems according to JG classification). Therfore we have the next
situation with HV bases now:
-2916 bases are placed into LGD (E852 set up);
-120 bases are prepared to be used (including checking with PMT)(rm.2-91);
-210 bases have DAC problems and can be repaired very easily if we will
have a stock of DAC custom chips (rm.2-91);
-5 bases are determined as "very difficult to be repair", perhaps it is
DAC problems too (rm.2-91);
-6 bases were found as mechanically destroyed.
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2. Spare parts for future repair.
<![CDATA[ Spare parts for MSU HV base repair are placed in rm.2-91. The most
important are:
-operational amplifiers KR140UD1208 (Russian specification) - 900;
-transistors KT605 - 60 (!);
-capacitors 47.5 mkF - 250;
-capacitors 10-30 pF (to change charging pulse frequency) - 50;
-all other units are enough too (KT361, K561LE5, capacitors and resistors
according to the specification).
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3.PMTs.
<![CDATA[ All stock phototubes are placed in rm.2-91. They are:
-untested - 220 (about);
-good - 110;
-bad (sometimes not so sensitive only) - 70.
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AY 1996-01-11