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MODEL 1000N
• Check the test points identified as (4), (5), (6), and (8).
• Proper functioning at point (6): Check (T1), (CR201), and (C201).
• Proper functioning at point (5), but not at point (6): Check (Q1) and (CR2).
• No oscillation at point (5): Check the voltage level at the lug identified as (1) on (Z1).
• Voltage ≈ 2.5 V: (Z1) is defective.
• Voltage level not equal to 2.5 V: Check (Z4) or (CR5) and replace defective component.
Proceed in accordance to the description of removal of printed circuit boards on pg. 13.
• Replace the circuit boards and proceed with verification of zero setting for 1000V / M Ω .
• Remove the bottom circuit board in order to gain access to the components.
• After reassembling the circuit board, complete the procedures in Section d on pg 11.
(b) The voltmeter reading is 250V (high voltage available, but measuring circuit is not
functioning):
• Check the fuse (F101, 0.315 A) that is accessible after removing the battery
compartment cover. (See Section A, on page 13).
• If the fuse is defective, it must be replaced.
• If the fuse is not defective, it is necessary to remove the bottom panel.
• Connect the voltmeter between the locations identified as T and D (an identical
grounding location can be selected on the binding posts for the high voltage switch), and
set the voltmeter at 250 V / M Ω . When the button is engaged, the voltmeter reading
should be approximately 4 V when resistance of 1 M Ω is being measured.
• Voltage level not appropriate: check (Z5) or (C103).
• Appropriate voltage level: Remove printed circuit boards (Section C, page 13) and use an
ohmmeter to determine if the circuit boards are disconnected. If disconnected, reconnect
the boards.
• Place the circuit board assembly upon the supporting layer and move the switch to 250 V
/ M Ω . Then it is necessary to connect a 1 M Ω resistor to the measuring output wires by
soldering. Supply power to the boards with a voltage level of 12 V. The voltage at point T
should be approximately 4 V. The output voltage for (Z6) (test point 11) should be
approximately 50.7 mV. Otherwise, (Z6) is defective. The output voltage for (Z7) (test
point 12) should be close to zero. Otherwise (Z7) is defective.
4/21/2005
REPAIR AND CALIBRATION MANUAL
19
REV. 7: March 13, 2004
FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC
CAT. #185.100
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