Sharp 29WF200, Service Manual

Page: 18 / 68

18
29WF200
29WF500
18-1
18-2
No
Yes
Yes Yes
No
Turn on colour control. Does colour appear?
TROUBLE SHOOTING FLOWCHART (Continued)
NO SPECIFIC COLOUR
C
Is only RF signal's colour abnormal?
Set colour control.
Turn on colour system forced switch. Does colour appear?
Fix cotrol to coloured system.
Check Q1900 and their peripherals.
Check D621 and its peripherals.
Check TU51, Q405, IC1900 and their peripherals.
Yes
Yes Yes
No
No
Is chroma input level of IC201 pin (43) proper?
Are signal waveforms at TP47R and TP47B proper?
Is SCP signal waveform at pin (30) of IC201 proper?
No
NO COLOUR
Check IC850.
Check IC201 and their peripherals.
No
PAL, SECAM, NTSC4.43: Check X800, pin (12) of IC201 and their peripherals.
SET Sub- colour.
Check IC201 and its peripherals.
TROUBLE SHOOTING FLOWCHART (Continued)
C
COLOUR PRODUCED
Colour in B/W mode.
Colour control circuit detective. Colour saturation control does not work.
Fix control to coloured system.
Turn colour control to minimum. Does colour disappear?
Turn up and down colour control. Does colour gain go up and down? Can the sub-colour be readjusted in service mode?
Turn on colour system forced switch. Does colour appear?
APG circuit: Check IC201 and its peripherals.
Yes
Yes
White balance: Check RGB output circuit of IC201.
Check IC201.
No
Yes
No
Check D621 and its peripherals.
PAL, SECAM, NTSC4.43: Check X800 pin (12) of IC201 and their peripherals.
No
No
Is chroma input level pin (43) of IC201 proper? Ref. value: 100 ~ 500mVp-p.
Yes
Fix control to coloured system.
No
Is SCP signal waveform at pin (30) of IC201 proper?
Are signal waveforms at TP47B and TP47R proper?
Yes
Yes
Check pin (45) of IC1900, IC1402, and their peripherals.
No
No
Yes
Check IC201.