|
|
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
Thank´s for your help, I already recived these manual from you
;
Thank you for your manual It has the basic things to and i use the Oszi for Longer Time.
THX
;
Actually, I was looking for this information for 3 years!...now thanks to you, the manual is on my hands and of great help, cause I understand now where I was doing wrong connections and wires...excellent, I'll be back to you if in need, thank you.
 ;
This manual covers the main equipment features only. While it also includes the procedure for saving and loading from the now long obsolete memory cards it does not mention the how to operate with the optional floppy drive interface so I am still at a loss about how to use this! Note that there is a separate manual covering the MIDI interface and programming via the keyboard, not included in this download. You will also need to get hold of this if you want to use the MIDI interface properly. Basically there is little difference between this manual and the free to download manual for the similar PR60 model.
;
Good list of manuals. I found a very rare one and easily get. Should be promptly to download, as we must to wait hours even after confirmed payment.
Section V Paragraphs 5-74 to 5-76 5-74. The cause of excessive output ripple on any of the supplies can be isolated in the following manner. Measure the ripple at the output of the rectifiers of the supply in question. Compare the measurement with the value given on the schematic diagram, figu r e 5-33. If the ripple is excessive, check the input filter capacitors and bleeder resistors. If the input ripple is normal, the cause is most likelylow gain in the amplifier transistors.
Model 175A 5-75. Table 5-5 gives troubleshooting aids for locating causes of loss of regulation in each supply. 5-76. The balance between the +6.3 volt and -6.3volt supply outputs and ground is determined by the supply load. The load is a series-parallel arrangement of tube heaters, diagrammed in figure 5-34. An unbalanced output voltage can usually be traced to an open o r shorted tube heater o r a wrong type tube.
Table 5-5. Troubleshooting the Low-Voltage Supply
~~ ~~ ~~ ~
Symptom High output
Procedure
Effect
Trouble Q461 shorted Q461 good
Disconnect base lead of Q461 from Output remains high printed circuit board. This is the yellow lead which connects to r e a r Voltage drops edge of board adjacent to fan motor Reconnect yellow wire to printed circuit board and short collector of Q464 to emitter.
Voltage drops Output remains low Voltage rises
~
Q464 open Q461 open Q461 good CR465 shorted CR465 good Q463 open o r C466 shorted Q463 and C466 Q464 shorted Q464 good Trouble in +llOV
Low output
Short collector of Q462 to emitter
Remove short from Q462 and measu r e voltage across CR465 Measure voltage across R470
0 volt 6 volts
Within 10 volts of output L e s s than output
Measure voltage from collector of Q464 to emitter +llOV High output Check -100 volt supply output
0 volt approx 10 volts
Normal
Disconnect base lead of Q442 from printed circuit board. This is the white lead which connects to r e a r edge of board adjacent to fan motor Voltage drops Reconnect white lead and measure voltage from collector of Q443 to emitter Measure voltage from collector of Q444 to emitter
~~
0 volt
Q443 shorted Q443 good Q444 shorted Q444 good Trouble in + l l O V
Greater than 2 volts
0 volt Greater than 2 volts
Normal Abnormal
Low output
Check -100 volt supply output
Short collector of Q443 to emiiter
Output remains low Voltage r i s e s
I
I
Q441 o r Q442 open Q441 and Q442 good
I
5-14
01526- 2
|
|
|
> |
|
