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Table 3-3. Test Points
Test Point
Number
Signal Measurement and Conditions
Connect meter or scope common to test point when taking measurements at test points through
U502-2
Primary/Chassis ground -
Q501-10
+ 5V (primary bias) + 5V (4.8 to 5.2V).
D503-cath
+ 13V (primary bias
rectifiers)
+ 13V (13 to 17 Vdc).
Q501-15
Q501-3
Q501-9
Q501-6
OPTO_ CLR
PCLR
PCLR
EEPON
Held low (0V) for approximately 80ms at power on and then goes high
(5V).
Goes high for approximately 80ms at power on and then goes low.
Held low for approximately 80ms at power on and then goes high.
At power on, holds the EEPROM's clock off to protect against
accidental data write when power is initially applied.
Connect meter common to test point when taking measurements at test points through .
C557-
Secondary common
C560+
+5V secondary bias +5V (4.8 to 5.2V)
C557+
+ 15V secondary bias
+ 15V
± 1V
C558-
-15V secondary bias
- 15V
± 1V
D554 - cath
+ 26V (secondary bias
rectifiers)
+ 23V to + 29V
Q551-12
SPCLR
Held low for approximately 80ms at power on and then goes high.
C556 +
Fan voltage
Press the front panel (blue shift) key and then the 9 key and
note the word "FAN" appears on the display. Now press the number
key (0-3) specified below, press
key, and take the
measurement. Repeat this procedure for each fan speed.
0 = 14.7V ±0.8V
1 = 10.7V ±0.6V
2 = 12.8V ±0.8V
3 = 9.7V ±0.5V
U213-7
SRX SRX (Secondary receive) serial data line. Toggles between 0 and 5V.
U214-3
STX STX (Secondary transmit) serial data line. Toggles between 0 and 5V.
U308-1
CV PROG In VOLT MODE, + 10V with full rated voltage programmed; +0.5V
with 3 volts programmed (6060B), or with 12 volts programmed
(6063B).
In CURR MODE or RES MODE (middle and high ohm ranges), +
13V.
In RES MODE (low ohm range), < 1V.
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