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There are currently no product reviews.
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muy buen manual por lo completo de este algunos esquemas estan muy divididos lo que hace algo dificil el seguimiento.
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very good manual, with detail and clarity in esquematic diagrams and waveforms .
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Very quality copy of original service manual, which contains the circuit diagrams, PCB and lists of components, well as recommendation for calibration procedures of device, also everything else, that need for repair, tuning and use this oscilloscope.
All presented copies have high-resolution, so you can view all in detail.
This manual will very useful for simple owners and for repairers.
I recommend these manual, because myself is owner of Philips PM3216 and I need sometimes servicing these oscilloscope (principally calibrating).
Also, these document is an example of excellent design of technical documentation.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
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manual excelente completo , diagramas y esquemas bien presentados y buena calidad de imagen.
Model 428B 5-59. TROUBLESHOOTING. 5-60. FRONT PANEL TROUBLESHOOTING. 5-61. The Front Panel Troubleshooting Tree was designed for use as a means to guide the repairman to a block of circuitry. This procedure, in combination with the adjustment, calibration, and performance checks should be adequate to repair most 428B's. 5-62. In any case where the front panel troubleshooting does not lead to the problem, it will be necessary to troubleshoot the instrument in detail. 5-63. DETAILED TROUBLESHOOTING. 5-64. Probe Check. 5-65. Resistance between pins 1-3, 1-4, 2-3, and 2-4 of the probe cable connector should be nearly identical and in the area of approximately 4 1/2 to 5 ohms. Where a resistance measurement between any of the above pairs of pins is significantly higher than between the other pairs (by about 3 times), an open probe coil is indicated. Any open circuit indicates a broken conductor between the plug and the bridge. The broken conductor is probably a broken wire in the cable. Either condition could indicate a broken wire at the Probe Terminal Section (see wiring diagram, Figure 6-1). 5-66. Power Supply Check. 5-67. To test the power supply: a. Measure +272 ±6 Vdc between Test Point 5 and ground. b. Measure +12 ±1 Vdc between the cathode of CR10 and ground. c. Measure -7 ±1 Vdc between the anode of CR9 and ground. 5-68. Where the +272 V and the +12 V have both failed, check the +12 first. Check CR10, Q1, C66, and C69.
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