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A good manual! fast service and good qualityi for pdf document.
Very helpful and complete manual. Maybe only one negative is schematics have sometimes unreadable name of the parts. But it's not a big problem.
Excellent high quality schematics brought my old Heidelberg back to life. Fast download at a reasonable price. Thanks.
This document is just what I was looking for, it´s very useful, it contains adjustment procedures for the final stage of the power amp and also
has a complete wiring diagram and description of the main semiconductors used in the design.
Thank you for the fast support, the manual does provide all necessary information to repair the radio. All schematics are in a good quality for reading.
The manual fits 100% to my requirements as a technican.
Kind regards Thomas
AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION
[Digital Scan Operation]
100Hz Digital Scan Converter circuit 100Hz converter circuit consists of the following ICs. - TC90A36F, IC7201 Field Progressive Converter - MSM518221A, IC7202, IC7203 Video Memory - TLC2932I, IC7204, IC7205 PLL (Phase Locked Loop) - MC74HC04AFP, IC7341 invertor The Y-signal output from IC101 is sent to pin 85 of IC7201<TC90A36F>, field progressive converter, after controlling the amplitude level and band-pass limiting by the circuit consist of Q7301, Q7302, Q7303, Q7304 and 8MHz LPF. The U/V-signal are also controlling the amplitude level and band-pass limiting by the circuit consist of Q7311, Q7312, Q7313, Q7314, Q7321, Q7322, Q7323, Q7324 and 4MHz LPF respectively. The U-signal is sent to pin 90 of IC7201and the V-signal is sent to pin 92 of IC7201. The HD signal is sent to pin 63 of IC7201 with positive polarity through IC7341 for shaping the waveform. The VD-signal is sent to pin68 of IC7201 with negative polarity through IC7341. The Y-signal input to IC7201 is converted from A to D in 8bit and output from pins 31 to 50 of IC7201 to pins 1 to 4 and 24 to 27 of IC7203<MSM51822A>, video memory, for writing. Digital scan circuit
LPF Q7351-Q7354 LPF Q7361-Q7364 LPF Q7371-Q7374
6 9 | 31
2Y 2U 2V
IC7201 DOUBLE SCAN CONVERTER <TC90A36F>
31 | 50
LPF Q7321-Q7324 LPF Q7311-Q7314 LPF Q7301-Q7304
85 53 59 63 68 70 71
IC7204 PLL <READ>
13 12 11 10
2HD 2VD VD HD
IC7205 PLL <WRITE>