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Manual acquired with good resolution, complete in all its pages, very good policy of the folder where are saved all products purchased.
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Service manual very complete and clear. It was very helpfull for my work.
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This is the 2nd time I download manuals from this website and I can say it's what I was expecting. It contains schematic, layout (decent quality), short description, parts and dissasembly instructions. I recomend it for anyone who wants to repair/modify this device.
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Very useful Service Manual! With it I was able to identify the damaged pots in my old amplifier, purchase the adequate replacements and make myself the repair.
I have again my old amplifier, still a very good one that I will keep for as many years as I can!
Thanks to Owner Manuals!
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Good price for the manual and easy to locate on the site and download. Plus, just like the original. Thanks a lot.
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Recovery flowchart (1-2)
[From the Recovery flowchart (1-1)]
Display RST MASK 13 (green 1023+3). / [MKS S63] Note: Disregard the discharge that may appear during voltage-change setting.
A
Set VOL OFFSET to the setting value 240. / [VOF 240] Gradually decrease the VOL OFFSET value until disappear the discharge (dead cell). � This setting becomes VOL OFFSET_max1.
VOL OFFSET_max1
Note: Make a note of this VOL OFFSET_max1 value.
B
VOL OFFSET_max1 Yes
085?
No
Replacement of abnormal circuits or re-replacement of the panel required
Display RST MASK 14 (blue 1023+3). / [MKS S64]
Set VOL OFFSET to the setting value 240. / [VOF 240] Gradually decrease the VOL OFFSET value until disappear the discharge (dead cell). � This setting becomes VOL OFFSET_max2.
C
VOL OFFSET_max2
Note: Make a note of this VOL OFFSET_max2 value.
VOL OFFSET_max2 Yes
085?
No
Replacement of abnormal circuits or re-replacement of the panel required VOL OFFSET_max
Choose the lower value between VOL_OFFSET_max1 and VOL_OFFSET_max2, and set it as VOL_OFFSET_max.
[To the Recovery flowchart (1-3)]
D
Recovery flowchart (1-3)
[From the Recovery flowchart (1-2)]
Is the VOL OFFSET_max value minus the VOL OFFSET_min value greater than 85? Yes
No
Replacement of abnormal circuits or re-replacement of the panel required
E
Are the VOL OFFSET_max value 176 or greater and the VOL OFFSET_min value 091 or less? Yes Set VOL OFFSET to the setting value 139. / [VOF 139]
No
VOL OFFSET_max
176?
No
Yes Set VOL OFFSET to the setting value VOL OFFSET_max minus 37. Set VOL OFFSET to the setting value VOL OFFSET_min plus 48.
Determine the current VOL OFFSET setting value as the final value.
F
[To the main flowchart (1)]
PDP-4280XA
5 6 7 8
135
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