Features; Pinning; Ak52 Chassis Manual Adjustments Procedure; Preliminary - Toshiba 29VH27D Service Manual

14.23.2.Features

Low voltage requirement
Biphase transmission technique
Single pin oscillator
Test mode facility

14.23.3.Pinning

Pin Mnemonic
1 X7 (IPU)
2 SSM (I)
3 Z0-Z3 (IPU)
7 MDATA (OP3)
8 DATA (OP3)
9-13 DR7- DR3 (ODN)
14 VSS
15-17 DR-2- DR0 (ODN)
18 OSC (I)
19 TP2 (I)
20 TP1 (I)
21-27 X0-X6 (IPU)
28 VDD(I)
Note:
(I): Input,
(IPU): input with p-channel pull-up transistor,
(ODN): output with open drain n-channel transistor
(OD3): output 3-state

15.AK52 CHASSIS MANUAL ADJUSTMENTS PROCEDURE

15.1.PRELIMINARY

Before starting with the alignment procedure, make sure that all the potentiometers on the chassis and
also screen and focus pots are in the medium position.

15.2.SYSTEM VOLTAGE ADJUSTMENTS

Inputs AC power (220V 50Hz)
PAL B/G test pattern via RF
(PAL I test pattern for PAL I TV's, SECAM D/K pattern, SECAM L/L'/K' TVs.)
Outputs Digital voltmeter to anode of D110.
Display System voltage
Action Apply power. Check that the stand-by Led lights.
Select TV mode and tune to the applied test pattern via local test keyboard.
Chassis should start normally.
Adjust all analog controls (volume, bass, treble, brightness, contrast, colour) to minimum
settings.
Adjust VR127 according to the following different type of CRTs.
SYSTEM VOLTAGE
135V±0.5V
135V±0.5V
135V±0.5V
135V±0.5V

15.3.AFC ADJUSTMENTS

Inputs AC power
38.9 Mhz test pattern for PAL B/G, PAL-SECAM B/G or 39.5 MHz test pattern for PAL I
model (90dBmV) to Z403 SAW filter input terminals 1 and 2.
Outputs Digital voltmeter to AFC point (pin22 of IC401)
Display AFC Voltage.
Action Adjust VL401 for 2.5±0.1 Volts. TV should automatically tune to a station when search
tuning is activated.
Function
sense input from key matrix
sense mode selection input
sense inputs from key matrix
generated output data modulated with 1/12 the oscillator frequency at a 25% duty factor
generated output information
Scan drivers
Ground (0V)
Scan drivers
Oscillator input
test point 2
Test point 1
Sense inputs from key matrix
Voltage supply
TYPE OF CRT
PHILIPS A66EAK552X54
PHILIPS A66EAK071X54
VIDEOCOLOR A66ECY13X12
PHILIPS W66ESF002X44
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