Fluke 123B/S Service Manual - Page 129

Loading Software, 7 Configuration of CPLD-chip D470, 5.14 PWM Circuit, 5.15 Randomize Circuit

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7 Corrective Maintenance 7.6 Loading Software 2. Check MS444 (ONKEY, D471) for +3V; when pressing the ON key the signal must be low for 100...150 ms. 7.5.14 PWM Circuit 1. Check the PWM control signals generated by D471. The signals must be measured on the small component (SMD) side of the Main PCA and must show 0...3V pulses, with variable duty cycle, and a frequency of 100, 25, or 6 kHz: a. CHARCURD (junction R442/C431) ≅ 100 kHz b. SADCLEV (R441/C432), POS A D (R439/C433), POS B D (R431/C442), TRIGLEV2D (R434/C438), TRIGLEV1D (R433/C439) ≅ 25 kHz c. OFFSETA-D (R438/C434), OFFSETB-D (R432/C441) ≅ 6 kHz 2. If not correct, check: a. TP306 (REFPWM2) for +3.3V (used for CHARCURD SADCLEV) b. TP304 (REFPWM1) for +3.3V (used for other PWM signals). If TP306 and TP304 are correct, D471 may be defective. 7.5.15 Randomize Circuit 1. Check TP483 for 0...+3V pulses, 25 kHz, variable duty cycle. 2. Check TP482, for +3...0V pulses, variable frequency and duty cycle. 7.6 Loading Software To load instrument software in the test tool, the Fluke-43-123-19x ScopeMeter Loader program V3.0 is required. Power the test tool via the power adapter input using the BC190 Power Adapter. 7.7 Configuration of CPLD-chip D470 The CPLD-chip (D470) must be programmed after being installed. CPLD is present on the Main PCA in the 123/124 ScopeMeter with installed software of version V2.00 and onwards (serial numbers approximately DM8250001 and onwards). CPLD is a programmable device with solder connections of the Ball-Grid-Array (BGA) type. CPLD is supplied as a non-configured device. After the CPLD has been soldered on to the Main PCA, it must be configured. To configure, the ScopeMeter Loader Program must be used and dedicated Loader and Model files. This has to be done in an Authorized Fluke Service Centre. After configuring, it must be checked if if the CPLD-configuration was succesfull: The function of CPLD is to assure that battery current drain is zero (

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Corrective Maintenance
7.6 Loading Software
7
7-17
2.
Check MS444 (ONKEY, D471) for +3V; when pressing the ON key the signal must
be low for 100...150 ms.
7.5.14 PWM Circuit
1.
Check the PWM control signals generated by D471.
The signals must be measured
on the small component (SMD) side of the Main PCA and must show 0...3V pulses,
with variable duty cycle, and a frequency of 100, 25, or 6 kHz:
a.
CHARCURD (junction R442/C431)
≅
100 kHz
b.
SADCLEV (R441/C432), POS A D (R439/C433), POS B D (R431/C442),
TRIGLEV2D (R434/C438), TRIGLEV1D (R433/C439)
≅
25 kHz
c.
OFFSETA-D (R438/C434), OFFSETB-D (R432/C441)
≅
6 kHz
2.
If not correct, check:
a.
TP306 (REFPWM2) for +3.3V (used for CHARCURD SADCLEV)
b.
TP304 (REFPWM1) for +3.3V (used for other PWM signals).
If TP306 and TP304 are correct, D471 may be defective.
7.5.15 Randomize Circuit
1.
Check TP483 for 0...+3V pulses, 25 kHz, variable duty cycle.
2.
Check TP482, for +3...0V pulses, variable frequency and duty cycle.
7.6 Loading Software
To load instrument software in the test tool, the Fluke-43-123-19x ScopeMeter Loader
program V3.0 is required.
Power the test tool via the power adapter input using the BC190 Power Adapter.
7.7 Configuration of CPLD-chip D470
The CPLD-chip (D470) must be programmed after being installed. CPLD is present on
the Main PCA in the 123/124 ScopeMeter with installed software of version V2.00 and
onwards (serial numbers approximately DM8250001 and onwards).
CPLD is a programmable device with solder connections of the Ball-Grid-Array (BGA)
type. CPLD is supplied as a non-configured device. After the CPLD has been soldered
on to the Main PCA, it must be configured.
To configure, the ScopeMeter Loader Program must be used and dedicated Loader and
Model files. This has to be done in an Authorized Fluke Service Centre.
After configuring, it must be checked if if the CPLD-configuration was succesfull:
The function of CPLD is to assure that battery current drain is zero (<1 mA) after the
ScopeMeter has been switched off. This current can be checked with a sensitive Digital
Voltmeter across R504/R506/R507 (0.33 ohms). The check must be done 10 times after