Front Panel - paco T-65 Assembly And Operating Manual

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21. Repeat Step 20, except with Function Selector in NPN "GX5" position.
22. Keep Function Selector in NPN "GX5" position. Remove 390-ohm resistor. Set YOM to DC
current. Connect (+) YOM test prod to lead 2 and (-) YOM test prod to lead 1. Set "B"
switch as indicated in the following table. Depress "READ METER" button. Meter should
read approximately as shown in the table. (Meter readings vary mainly because of im ­
pedance of YOM used.)
"B" S witch
1 2 3 4 5
YOM Reading
40 to 60 J1.a 150 to 250J1.a 400 to 600 J1.a
1.5 to 2.5ma
4
to 7ma
23. Repeat Step 22 for NPN "GX1" position. (Only one reading required.)
24. Reverse YOM test prods and repeat Step 22 for PNP "GX1" and PNP "GX5" positions. (Only
one reading required for each Function Selector position.)
25. Keep Function Selector in PNP "GX5" position. Set YOM to 3 VAC. Connect YOM test
prods between leads 2 and 3. YOM should read 1 VAC ±20% with "READ METER" button
in both normal and depressed positions.
26. Repeat Step 25 for PNP "GXl ", NPN "GX1" and NPN "GX5".
27. Remove YOM test prods. Set "All switch to "1", "B" switch to 1t5" and Function Selector
to ItDf". Take a crystal diode known to be good (silicon rectifier may be removed from
Model T-65 for this check). Connect diode cathode (+) to lead 4 and diode anode (-) to lead
2. Depress "READ METER" button and note meter reading, if any. Release button and set
"B" switch to "4". Depress "READ METER" button. Meter reading, if any, should be
higher than the previous reading.
If
meter readings were obtained, check is then completed.
,If
not, proceed as above, setting "B" switch to successively lower numbers. Note that it is
not necessary or desirable to go through the remaining lower numbered "B" switch positions
TRANSISTOR
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AND CRYSTAL DIODE
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DIODES
FRONT PANEL
Page 25