Keithley 2010 Service Manual

Power supply checks
Power supply problems can be checked using Table 4-3. See Principles of operation for
circuit theory on the power supply.
Table 4-3
Power supply checks
Step Item/component Required condition Remarks
1
2
3
4
5
6
7
8
9
10
11
12
13
Line fuse
Line voltage
Line power
U144, pin 2
U101, pin 7
U180, pin 3
U179, pin 3
U124, pin 3
CR141 cathode
CR139 anode
U180, pin 1
U179, pin 2
Q183, emitter
Check continuity.
120V/240V as required.
Plugged into live receptacle, power on.
+5V ±5%
+37V ±5%
+15V ±5%
-15.7V ±5%
+5V ±5%
+25V ± 20%
-25V ±20%
+18V ±20%
-18V ±20%
+21V ±5%
Remove to check.
Check power module position.
Check for correct power-up sequence.
+5VD, referenced to Common D.
+37V, referenced to Common D.
+15V, referenced to Common A.
-15V, referenced to Common A.
+5VRL, referenced to Common A.
+25V, referenced to Common A.
-25V, referenced to Common A.
+18V, referenced to Common A.
-18V, referenced to Common A.
+20V, referenced to Common A.
Troubleshooting 4-11

Keithley 2010 Specifications

General

Frequency Range	3 Hz to 300 kHz
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
DC Current Range	3 A
DC Current Accuracy	0.05%
AC Current Range	3 A
Resistance Accuracy	0.01%
Interface	GPIB, RS-232
Power Supply	50 Hz or 60 Hz