Tektronix DAS9100 User Manual

)
)
)
Service Administrative Support •
670/A, 671A, 672 COLOR TEMPERATURE MOD
REF: SAR #16778
670, 671, 672 Instruction Manual
P/N 070-1445-00
670A, 671A Instruction Manual
P/N 070-2201-01
670-1 Series Instruction Manual
P/N 070-1946-00
670A-l Series Instruction Manual
P/N 070-2202-00
Mod 5224-4
Recent inputs from the Field have
indicated problems concerning setting·
up color temperatures in the 670
Series Color Monitors.
The problem centered around the proper
high and low light values, and the
inability to set all three colors up
for a proper white. With Red and Blue
set for the proper 10 IRE and 100 IRE
levels, Green had insufficient
adjustment range. This becomes
particularly apparent when the CRT is
changed due to slight changes in the
phosphors from batch to batch.
Mod 52244 has made R4201 and R4231
test selectable with a nominal value
of 5.iK ohms (P/N 315-0512-00). The
selection range is approximately -lK
ohms+ 3K ohms.
This mod will alter the Red and Blue
biases enough to allow the three guns
to track.
w2 Issue 13-21
690SR/6942 HY POWER SUPPLY FAILURE
REF: 690SR Instruction Manual
070-3821-00
690SR Opt. 40 & 48 Instruction
Manual, 070-2870-00
-15-
October, 1883 la81.1e 31
Several field failures have shown the
following symptoms:
o Burst mode (HY overload)
o Erratic or non-existant phase-lock
of the high volt output circuit
o No control through U445
If the High volt oscillator circuitry
cannot be shut down by grounding pin 9
of U445, one of the first places to
look for a problem may be a shorted
transistor at Q304. If this device is
shorted, +200 volts will be applied to
QlOO, it will start to turn on, and
will be shut off intermittently (burst
mode) by the High Volt Overload
protect circuitry due to the lack of
coincidence of the H-Deflection signal
with the High Volt oscillator.
w2 Issue 13-21
834 POWER SUPPLY AUDIBLE NOISE
REF: 48621
An audible whining noise can occur in
the power supply of the 834 due to the
low value of capacitor A4C441.
To eliminate this condition A4C441 was
changed from 270uF, 40V (290-0946-00)
to 470uF, 35V (290-0919-00).
w2 Issue 13-20
1450 RF LEVEL INDICATION
RE: 1450/1450-1 Manual
07 0-2200-01
As the result of a customer's
inquiry concerning the reason why
the RF Level changes about 3dB
between modulated and unmodulated
signals when in the SYNC TIP/AGC
(ARTICLE CONTINUED ON THE NEXT PAGE)

Tektronix DAS9100 Specifications

General

Brand	Tektronix
Model	DAS9100
Category	Measuring Instruments
Language	English