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Complete MFG Service Manual at a good price FAST !
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Downloaded the manual, reasonably straightforward, pretty much exactly as advertised.
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very helpfull
circuit diagram and sparepart list available
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Very good reproduction (copy) of original manual. Didn't have a parts list, but schematic was completely labeled with parts. Complete instructions on how to adjust mechanical functions of the 8-track deck. Well worth having and at a very reasonable cost.
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It's a full manual. All the parts are in there. I haven't found the problem yett, but I am working on it; hope I can rebuild the part myself. To make it more secure and unbreakable this time. Because the part has failed several times before and costs a lot to let it be repaired.
Thanks so much for this rich illustrated and parted manual.
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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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