Service manual

SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS
(continued)
Table 2 Functions and Service Data of STR-F6626 (NQ821)’s Pins
Digital Multimeter
Pin No. Function Description
Reference Voltage(V)
Positive Resistance
(20K
)
Negative Resistance
(20K )
1
Overcurrent detection &
voltage stabilization control
input
1.87 0.687 0.6
2 Switch transistor’s source 0.09 0.0001 0.
3 Switch transistor’s drain 144
4 Control circuit power 17.85
5 Control circuit ground 0 0.001 0
Table 3 Functions and Service Data of LC86F3248AV-DIP (N001) s Pins
Digital Multimeter
Pin No. Function Description
Reference Voltage(V)
Positive Resistance
(20K
)
Negative Resistance
(20K )
1 Not connected 9.45 5.33
2 Clock line 4.8 9.43 5.07
3 Data line 4.86 9.4 5.05
4 Not connected 0 0 4.75
5 Not connected 0 0 5.3
6 Not connected 0 0 5.38
7 VM circuit control 5 9.3 5.19
8 Not connected 0.2 9.4 5.38
9 Ground 1.91 0.001 0.00
10
Input terminal for clock oscillating
signal
2.62 9.4 6.03
11
Output terminal for clock
oscillating signal
5 8.9 6
12 Supply voltage 5 3.5 3.25
13
Button-control voltage input
terminal
5 9.4 5.28
14
Button-control voltage input
terminal
5 9.4 5.27
15 Standby indicator control 5 9.4 5.45
16 Not connected 5 9.2 5.5
17 Reset 5 4.6 4.47
18 Filter 2.83 9.1 5.44
19 Video signal input terminal 2.75 9.1 5.99
20
Input terminal for vertical flyback
pulse
4.7 8.5 5.08
21
Input terminal for horizontal
flyback pulse
4.08 8.6 5.08
22 R character output terminal 0.01 2.16 2.11
23 G character output terminal 0.01 2.1 2.11
24 B character output terminal 0.01 0.1 2.11
25
Output terminal for fast blanking
signal
0.01 2 1.99
26 Character level clamping 0.01 9.2 5.81
27 Clock line 0 5 6.7 4.89
28 Data line 0 5 6.8 5.1
(Continued)
26